Danvillan
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The DIY turbo build thread

Mon 14 Jan 2013 11:02:17 PM
So I'm currently in the process of building a 1995 Micra SLX
Unlike some of the cashed up builds you have seen in the past on this forum, I'm trying to build a turbo'd Micra on somewhat of a budget with a lot of the parts supplied by member on this forum.

When I decided to build this car I did so with the intention to learn as much as possibly in relation to a lot of different things I have never done before eg striping and rebuild a motor, working with fibreglass, welding, and spray painting. So the best way to learn is to DO IT YOURSELF.

I don't have any type of mechanical trade background and limited mechanical knowledge. What I do is research, research some more and ask questions.

For me I get a sense of achievement to do things for myself even if it doesn't turn out that well, I guess thats how you learn.

So I have decided to create a build thread which outlines the journey of the DIY turbo build.

The projects I have planned to do myself are as follows:

DIY side feed intake plenum
DIY Turbo manifold and dump pipe
DIY Head port and polish
DIY Full respray
DIY mandrel bent exhaust system
Alot more as I go along, I will try and update this thread regularly.

I have created a couple of DIY threads already and thought I might as well put it all into one thread.

Previous DIY threads:

DIY cold air intake box = http://www.micra.com.au/community/message.php?messageid=82137

DIY Pillar gauge pods =
http://www.micra.com.au/community/message.php?messageid=81873

The plan is to do as much as I can on my own and save as much money as I can on the way.

Wish me luck.... ;p
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:15:28 PM
Good stuff mate, add it to my "build thread thread" with a pic :)
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:16:25 PM
CG13de standard bottom end
Ported and polished Head decompressed to 8.2:1 (hopefully with some Poncam)
4.3 kg JUN flywheel
Datrat clutch
DIY Side feed intake plenum with sr20 TB
T25 Garrett turbo
DIY turbo manifold and Dump pipe
Sr20 injectors with custom fuel rail
EMS 4424 Stinger
XR6 Front mount intercooler 200x 700
walbo fuel pump
adjustable fuel regulator
HKS front coilovers
camber bolts
Whiteline anti lift castor kit
Whiteline lower control arm brace
Nismo gauge cluster

Some of the parts ready for the build plenty more to come no doubt.

So this is the Micra in her current state.......
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:16:44 PM
Will be watching this post and the others closely as I am in the same position.

Good luck with it all.
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:18:03 PM
CG13de standard bottom end
Ported and polished Head decompressed to 8.2:1 (hopefully with some Poncam)
4.3 kg JUN flywheel
Datrat clutch
DIY Side feed intake plenum with sr20 TB
T25 Garrett turbo
DIY turbo manifold and Dump pipe
Sr20 injectors with custom fuel rail
EMS 4424 Stinger
XR6 Front mount intercooler 200x 700
walbo fuel pump
adjustable fuel regulator
HKS front coilovers
camber bolts
Whiteline anti lift castor kit
Whiteline lower control arm brace
Nismo gauge cluster

Some of the parts ready for the build plenty more to come no doubt.

So this is the Micra in her current state.......
 

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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:24:13 PM
sounds very good dan :)
be careful with those quench steps when decompressing eh
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:37:06 PM
you wont drop compression with just port and polish, you will need a thick head gasket or run 2 standards, or go one better and run decompressed pistons, you can still get good boost/power without decomping the engine JCMicra on here, runs standard engine with Haltec Platinum 500 ECU, with 10 psi and getting 170ish HP at the wheels (having fuel spark problems from what he has told me, going coilpacks)
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:43:33 PM
DIY SIDE FEED INTAKE PLENUM

So the other day I went to the local sheet metal fabricator and bought some aluminium sheet for the job.

Got a piece of 4mm marine grade aluminium and 6mm aluminium, also some 32mm aluminium pipe. Cost me $20 pretty cheat for a custom plenum

Started by cutting the intake flange off the OEM manifold.

I then sat down did a bit of research on plenum designs and drew up my design.
Majority of the plenums you see are round made from 4 inch pipe but I'm making mine boxed (just easier for me and it is not the major factors to worry about when designing the plenum).

The factors that need to be considered are:-
1. Plenum volume (some say it should be twice the volume of the engine capacity)
2. The ratio between the plenum diameter and each cylinder
3. Air flow and friction within the plenum.

So my design is a little less than 3 litres in volume roughly twice the engine capacity should be able to deal with the turbos compression.

The ratio between the cylinder I aimed for were cylinder 4 =100%, cylinder 3 = 86% cylinder 2= 70%, cylinder 1 = 50%. If cylinder 1 is 50% of cylinder 4 generally the line between cylinder 2 and 3 should follow that %.

In relation to air friction within the plenum, the runners will be feed about 10 to 15mm off the floor of the plenum. The runner will also have bellmouth endings to assist the flow of air.

Once the design was drawn up it was transferred to the aluminium sheet.
No hi tech laser cutters here just a jigsaw, hole saw and file were used to cut the pieces.

To be noted - I used the 6mm Aluminium for the TB flange which the SR20 TB will be drill and tapped. I also used the 6mm for the longer top piece so I can tap the vacuum line into it.
 

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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:49:25 PM
RTK as frank said Quench step will be removed to drop the compression.

Hey Frank what do I need to watch out for when removing the quench step, don't go past the point of the head gasket or is there something else I should be watching out for?

Thanks
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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:52:02 PM
As you can see the pipe is round and the runner on the OEM manifold are oval. What to do?
 

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Re: The DIY turbo build thread

Mon 14 Jan 2013 11:55:12 PM
Solution... press the end in a vice till it takes the oval shape of the OEM intake. As seen on the photo above the top is round and the bottom matches closely to OEM intake manifold.
 

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Re: The DIY turbo build thread

Tue 15 Jan 2013 12:02:09 AM
Once pressed the pipe is a little bigger than the standard intake so I rounder the edge off to smooth out the air flow a bit.

Anyway I'm not going to attempt to weld this this myself when I have a friend who can TIG weld aluminium and will do it for free (suppose it will cost me a case of beer).

The only this I haven't figure out yet is how I'm going to get the end of the runner bellmouthed? Hopefully my friend will have a solution.
 

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Re: The DIY turbo build thread

Tue 15 Jan 2013 12:09:00 AM
Danvillan WROTE:

"RTK as frank said Quench step will be removed to drop the compression.



Hey Frank what do I need to watch out for when removing the quench step, don't go past the point of the head gasket or is there something else I should be watching out for?



Thanks "


i think they,re important in terms of DET resistance dan, i would cut them scallop shaped personally (leaving the actual step intact) and then cut the bowls to the full H/G dia and into the corners.
you could also have the seats cut 1mm or so to drop the c/r more eh, and then tickle the stem ends down for exact valve clearance
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Re: The DIY turbo build thread

Tue 15 Jan 2013 12:42:24 AM
Frank, I noticed in the past you have remove the quench steps on one of your engines. Did you have dramas when you did it? How exactly does the quench step resist DET? Only reason I ask is because in the past you have recommended this as a way to lower c/r, just wondering what has changed your mind about this method.
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Re: The DIY turbo build thread

Tue 15 Jan 2013 01:24:33 AM
hey m8

I started out bout the same way. I was a product designer but luv tinkering with mechanical/electrical stuff.
Since I brought my first micra, just built my knowledge & experience of working on the car simply by researching, designing, building and testing.

if I didn't have the required skill/resource, either outsource it if times limited, or learn the new skill myself by reading and doing if there's free time and can afford the equipment.

best ppl I know who make DIY performance mods on a budget n suggest checking out are either frank or ebbdude

I've also got a detailed diary blog of my micra turbo's modding history start to finish that may help you.
here's a seperate linked Index page to my blog to find things bit easier cos its least 70 pages long :p

http://www.micra.org.uk/threads/pollymobiles-rebuild-blog-index.52496/
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Re: The DIY turbo build thread

Tue 15 Jan 2013 05:17:09 AM
Danvillan WROTE:

"Frank, I noticed in the past you have remove the quench steps on one of your engines. Did you have dramas when you did it? How exactly does the quench step resist DET? Only reason I ask is because in the past you have recommended this as a way to lower c/r, just wondering what has changed your mind about this method. "


i only tested it out on 1 chamber dan, and never ran it, and i think they are important for the combustion/flamefront stuff mate
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Re: The DIY turbo build thread

Tue 15 Jan 2013 07:14:48 AM
Thanks Frank, might just leave it alone then and get a thicker H/G. Anyone know how much of C/R drop you will get with a 2mm H/G.

asdame thanks mate, I have checked out some of your blog already. Big read plenty of info in there.
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Re: The DIY turbo build thread

Tue 15 Jan 2013 07:29:05 AM
Danvillan WROTE:
"Thanks Frank, might just leave it alone then and get a thicker H/G. Anyone know how much of C/R drop you will get with a 2mm H/G.





"


these were my calculations for 2 x stock H/G,s dan

"if the combustion chamber + gasket is 29cc
then a 1.0 works out to 250cc (1 cyl) + 29cc = 279cc
divide that by 9.5 (c/r) = 29cc
and a 1.3 cyl is 319cc + 29cc (chamber + gasket) + 8cc (piston dish) divide that by 9.5 (c/r) = 37cc
so going by that, the chamber is 24cc, the h/g is 5cc, and the 1.3 piston dish is 8cc.
and i get 2 headgaskets to 8.6:1 (319 + 24 + 5 + 5 + 8 = 361cc, divide that by the total combustion area of 42cc = 8.6:1 c/r"

but you should be able to easily enlarge the chamber 2 or 3cc by machining (and still retain the quench step)
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Re: The DIY turbo build thread

Wed 16 Jan 2013 10:35:22 PM
So pulled the head off today and found that the water gallery had corroded away in a few spots the worst being about 2 - 3mm deep, not happy to use this to boost so I'm look for a new one.

I took all the parts for the intake plenum to my mate yesterday and he reckons he'll have it done by tomorrow. Looking forward to see how it turns out. Will post some pics once I get it back.
 

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Re: The DIY turbo build thread

Wed 16 Jan 2013 10:46:25 PM
DIY TURBO MANIFOLD

So started building the turbo manifold today. I bought the exhaust flange and the T25 flange from Liverpool Exhausts for about $40.

Bought a few mandrel steam pipe bends from the local metal supplier as well as some straight pipe of the same diameter. The bends and pipe are 32mm ID or 1 1/4 inch ID.

I am basically going to tac weld the manifold together and then get my mate to TIG weld it up.

Started by making the collector to T25 flange, tried to cut some straight pipe to use for the collector but after a hour or so of grinding I gave up using the straight pipe and opted for some 6mm flat bar.

Welded it from the flange flaring it out to 80mm or so square which is the width of two pipes.

Damn gassless MIG welder is shit, splatter everywhere. Does the job I suppose.
 

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Re: The DIY turbo build thread

Wed 16 Jan 2013 10:54:31 PM
I was originally going to delete the aircon to make things easier on myself but after driving around the last couple of weeks in hells fire I have gotta try and keep it. So the hardest runner is going to be from the exhaust port near the alternator as there is f&*^ all room for the manifold.

Welded the collector to the exhaust flange via 2 braces. This took a couple of goes, this has to be pretty spot on as there is not much room for the turbo in the engine bay.

From here I'll try to put the jigsaw of bends together to make something that resembles a turbo manifold.
 

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Re: The DIY turbo build thread

Wed 16 Jan 2013 11:26:18 PM
an integrated mani/turbo housing like mine might be easier to squeeze in with the aircon dan ?
good enough for VXR,s eh :)

 

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Re: The DIY turbo build thread

Wed 16 Jan 2013 11:36:23 PM
Yeah that's an option but I think I've figured it out in my head how I'll make it work. Time will tell. Thanks for the suggestion, Frank.
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Re: The DIY turbo build thread

Thu 17 Jan 2013 06:37:03 PM
A lot of grinding a bit of welding than a lot more grind today and the results are as follows.

Started with cylinder 2's runner to the collector

(to be noted - prior to welding every part was hit with a wire brush thingy in a drill to make it nice and clean ).
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 06:38:44 PM
After a lot more grinding and a bit of welding the runner for cylinder 3 was finished.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 06:39:37 PM
Then cylinder 4 runner completed
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 06:42:53 PM
Cylinder 1 took a few goes to get right due to the alternator being in the way of the runner, but with a little persistence it final completed the tac welding of the turbo manifold.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 06:44:09 PM
Test fit on the head.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 07:01:57 PM
Very close to the alternator going to have to do something about protecting the alternator from the heat of the manifold.

Anyway the manifold is complete ready to be TIG welded by a friend. So far the manifold has cost about $60 or so, the welding will be free from a mate. Less than a $100 for a custom manifold which I think looks pretty neat, no too bad considering you would be looking at $600 to $800 for a custom manifold.

I like the configuration of the runner they look neat, although it not a tuned length manifold I dont think it should matter too much.

The way the runner 1 is leaves plenty of room for the dump pipe which I'm happy about.

To TIG it I believe each runner will need to be removed and welded up then replaced in the same position and welded to the flange, starting from cylinder 2 and 3 then 4 and 1. (to be noted I did not tac the runner to the collector it will be removed)

Once in position the collector and brace can be removed and the gaps between the runners at the collector will be filled.

Collector will be welded off the manifold then welded to the 4 runners, easy as that , happy its not me doing it.

So if you are good at TIG welding you could make a descent turbo manifold for under $100 dollar with about 10 hours of labour and 10 grinding discs.

Will post pics of completed manifold once finished.

Question anyone have an idea how much it cost to HPC coat a manifold?
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 07:20:50 PM
My mates been a bit busy over the past couple of days and hasn't been able to complete the plenum.

He's made a start though.

The intake runner have been flared out ready for welding, this was done by heating up the Aluminium then letting it cool. The aluminium stays soft even when cooled, he then used a flaring tool and press to flare the runners out.

Coming along nicely. Can't wait to see it complete.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 08:09:13 PM
I feel bad my mates stayed at work till 8:00pm doing the plenum for me. He sent me a couple of pics, couldn't be happier at the moment.

Definitely going to owe him a couple of cases for this one. Beer the currency of mate.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 08:11:36 PM
Pic of the back side showing where the vacuum lines will be tapped.
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 10:08:45 PM
Danvillan WROTE:

"Very close to the alternator going to have to do something about protecting the alternator from the heat of the manifold."


prob be ok, they're pretty robust

mine is right next to the turbo elbow and without the plastic cover and has survived 13yrs of normal NA use and 2yrs of turbo use with afew trackdays and still going strong :)
 

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Re: The DIY turbo build thread

Thu 17 Jan 2013 10:51:53 PM
asdame WROTE:

"
Danvillan WROTE:



"Very close to the alternator going to have to do something about protecting the alternator from the heat of the manifold."




prob be ok, they're pretty robust



mine is right next to the turbo elbow and without the plastic cover and has survived 13yrs of normal NA use and 2yrs of turbo use with afew trackdays and still going strong :)"


So you've had no dramas with removing the plastic cover that's good to know. I will probably have to do that.
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Re: The DIY turbo build thread

Fri 18 Jan 2013 09:53:11 PM
Intake manifold complete. Very happy how it turned out. So for $30 in materials you can make nice custom intake manifold if you have the welding skills or as in my case a friend who does. I only paid $10 for the sr20 TB as well so I got away with it pretty cheap just a couple hours of preparation.

Just going to polish it up a bit and it will look a million bucks.

Hopefully it performs as well as it looks.

On a side note I asked my friend how much he would charge to make something like that from scratch he said at least $600 maybe $800. I asked him how much he would charge to weld the pieces together if someone came with the parts prepared he said about $200 or so. Just for anyone who would want to make one but can't weld and knows no one who can weld. $250 for that intake manifold is still pretty cheap if you ask me.
 

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Re: The DIY turbo build thread

Fri 18 Jan 2013 09:53:50 PM
Another pic
 

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Re: The DIY turbo build thread

Fri 18 Jan 2013 09:58:01 PM
Inside the plenum chamber. It would be nice if the runners were fully rolled but I'm not going to complain seeing it costed me nothing to be done. Should work well all the same.

Just need a new head to bolt it to.

Come on guys someone must have a head in good condition that you don't need, PM me.
 

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Re: The DIY turbo build thread

Sat 19 Jan 2013 07:33:12 PM
DIY RADIATOR SUPPORT REPAIR

Little bit more work done today, trying to get as much done as I can before I have to go back to work next week.

The bottom radiator support had a couple of spot were the rust had eaten through, pretty common problem. So I cut out the rust and weld some pieces of metal to repair it.

 

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Re: The DIY turbo build thread

Sat 19 Jan 2013 07:42:54 PM
Geez I'm a hack at welding, but it will do the trick no one will ever see it and it's better than having rust. Bit of paint after grinding back the weld a bit and she's done.
 

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Re: The DIY turbo build thread

Sat 19 Jan 2013 07:46:38 PM
DIY BAD BOY BONNET

While I had the welder out I thought I might as well have a crack at a bad boy bonnet seeing I'm going to be respraying the car anyway. So cut two pieces of metal to be welded to the bonnet. I used a concave cut rather than a straight cut across the headlights.
 

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Re: The DIY turbo build thread

Sat 19 Jan 2013 07:48:30 PM
wire brush thingy used to take the bonnet back to metal. Then the metal is tac welded to the bonnet
 

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Re: The DIY turbo build thread

Sat 19 Jan 2013 07:50:35 PM
Tac welds are ground back a bit and bog used to fill the welded metal section. I'll continue tomorrow with a bit more bog and a lot of sanding.
 

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Re: The DIY turbo build thread

Thu 24 Jan 2013 05:59:17 PM
Had to sand all the clear coat off the bonnet as you can see in the photo above there a lot of small patches were the clear coat has come off. A fair bit of sanding was required but once done a bit of wax and grease remover. Then I hit it with 3 coat of 2k primer. Nearly finished just a bit of sanding and then the base coat and flat clear.

I saw a Hyundai Veloster Turbo the other day in matte grey and thought the micra would look good in that same colour. So I'm spraying the car in Young gun grey with a matte/flat clear coat.
 

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Re: The DIY turbo build thread

Thu 24 Jan 2013 06:13:07 PM
Bit of modding to the grill as well, courtesy of a hacksaw blade. Removed the centre section and bit of fibreglass and bog.
 

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Re: The DIY turbo build thread

Thu 24 Jan 2013 06:15:29 PM
rear bumper had a bit of bog applied to smooth out the indented section on the bumper. Rear bumper add-on test fitted.
 

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Re: The DIY turbo build thread

Thu 24 Jan 2013 06:20:33 PM
A lot more bog to fill the indented section of the rear bumper. Had to sand all the green/blue paint off the fibreglass add-on as I didn't trust it to hold paint. Fair bit of work to sand the bumper back but I slowly got there. 3 coats of 2k primer but on the bumper and grill.

Forgot to put some plastic adhesive on a couple of spots on the bumper where I took it back to the plastic hopefully it sticks ok, was only a couple of small spots.

 

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Re: The DIY turbo build thread

Thu 24 Jan 2013 07:21:52 PM
Looks like a neat job !
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Re: The DIY turbo build thread

Thu 24 Jan 2013 10:48:35 PM
i like bacon and eggs
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Re: The DIY turbo build thread

Sun 27 Jan 2013 01:36:37 PM
base coat clear flat put on the grill, rear bumper and bonnet. As to be excepted when spraying in a garage I got a bit of shit in the paint work but nothing to bad.

After applying the flat clear coat I used a halogen light to bake the clear coat on for about half an hour.

Not totally happy with the result because the couple of spots where there is some contaminates in the paint but what can you do without a booth.
 

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Re: The DIY turbo build thread

Sun 27 Jan 2013 01:37:44 PM
End results with the Flat Young gun grey on the bonnet.
 

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Re: The DIY turbo build thread

Sun 27 Jan 2013 01:39:51 PM
The rear bumpers finished. On to the front guards, doors and hatch next, then finish off with the body.
 

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Re: The DIY turbo build thread

Wed 30 Jan 2013 07:12:14 PM
Fix the front bar which had cracked on the bottom edge. A bit of fibreglass and bog did the trick. To stop further cracking, I fill the bottom section with expanding foam to give it some extra strength.
 

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Re: The DIY turbo build thread

Wed 30 Jan 2013 07:13:53 PM
Front bar painted. slowly getting there, rear hatch is next then the doors and finish with the shell.
 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:23:57 PM
Bonnet done. Wiper removed, de-badged and colour coded handle.
 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:39:03 PM
******************* DIY GHETTO SIDE SKIRTS ********************************
So I've got a front and rear bar for the Micra but no side skirts and in true DIY style I've decided to have a go at making some side skirts.

I don't know if this is going to work out but I'll have a crack.

So after a bit internet searching in relation to making side skirts I found that some people have use rain gutter to make side skirts, I know it's ghetto but what do you do. If this fails then I'll just try to modify some other side skirt to suit the Micra, as I don't fancy importing side skirts from Japan and there not readily available here, and if you do find some you'll probably have to pay an arm and a leg.

Went to Bunnings and bought a length of PVC rain gutter, also need another set of front mud guards.

 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:41:13 PM
Screwed the front mud guard to the rear quarter panel as it has the same profile
 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:42:51 PM
Taped up the under side where the skirting will run with masking tape. It's hard to see but there is tape there.
 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:47:56 PM
I used a off cut to muck around and cut the profile needed for each end of the gutter/side skirt. this off cut is then placed over the top of the gutter to use as a guide to cut the profile needed. I did this because it takes a couple of goes to get it right and if you do it to the length you want to use you will probably end up short.

Anyway once it was cut to length I used some hot glue and double sided tape to hold it in position.
 

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Re: The DIY turbo build thread

Sat 02 Feb 2013 08:54:22 PM
I then drilled a couple of 10mm holes along the gutter and filled it with expanding foam. This will give it a bit of strength and I hope it will hold the mud guards in place till I can fibreglass it to the gutter.

I plan is to let it set over night and then remove it. I'll then use some fibreglass and bog to form the side skirt to the mud guards.

Don't know if it's going to work but you never know unless you have a go, I'm only down $30 if it doesn't work out.

Update tomorrow as long as the rain holds off.
 

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Re: The DIY turbo build thread

Sun 24 Feb 2013 05:39:49 PM
The ghetto side skirt will be put on hold for now may come back to it at a later stage but probably a little to ghetto for my Micra.

FYI, after the foam set I bogged up both side and tried to get some type of shape, need a lot of bog and sanding.

 

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Re: The DIY turbo build thread

Sun 24 Feb 2013 05:43:12 PM
Well you have gotta try these things sometimes, may come back to it one day.

I created a page 2 to this thread as it's getting a bit long

http://www.micra.com.au/community/message.php?messageid=83002&r=3
 

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