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Kyle Saenz's Avatar
Join Date: Nov 2011
Posts: 55
Want to Turbo Your 3.2? Here's How!

Hello all here's my first post, I figured I would try and make it a good one! (I also posted this on rennlist)
I just got done with a Turbo build on my carrera 3.2 and I thought I would post a "how to" to help with those who do the same and also to help show how straight forward and easy of a way this is to gain another 100+hp on your stock engine. All in 20 easy steps!

Since there is no longer a kit you can buy (at least that I am aware of) You will have to piece it together yourself, however here is a list of everything you will need:
  • turbo of your choice (I recommend a t3/t4 with around .63 to .83 a/r)
  • 930 J pipe or 930 turbo manifold (OBX ebay special works great)
  • 38mm or larger external wastegate with no more than a 7psi spring
  • wastegate dump pipe (ebay special works fine here)
  • boost gauge
  • intercooler piping kit (ebay special is also fine here)
  • blow off valve, and blow off valve adapter pipe
  • if your turbo outlet is 2" than an adapter coupler to whatever diameter you intercooler piping was is needed
  • Fuel management unit (FMU) 8:1 or possibly 10:1 is ideal
  • oil feed/return line kit
  • Cone filter napa/shucks brand is fine
  • -10 AN TO 20MM-1.5 adapter
  • -6 AN TO 1/8th NPT adapter
  • -6AN TO 16MM X1.5 adapter (male-female)
  • -6 TO 16MM X1.5 adapter (male-male)
  • 6 AN Stainless steel hosing (High pressure rating)
  • 4 -6AN Hose ends (female)
  • about 12' of vacuum line
  • oil/oil filter
  • Protomotive chip or some form of piggyback (not needed, but highly recommended)
  • Some form of exhaust for the turbo (I run a straight pipe)
  • Wideband air fuel ratio guage/kit (not needed but highly recommended)

Many of those things can be ebay specials and many can not, what you want to go cheap on is your choice. Just keep in mind if you go cheap on intercooler piping or exhaust when/if they fail it won't blow up your engine while on the other hand if the FMU or your wastegate fails that could be a costly expense...

Okay I started this project on a friday afternoon and finished on a sunday afternoon. It was pretty straight forward, if you can change spark plugs or brake pads this is a project you can complete entirely yourself. Before we get started I would like to apologize for not including pictures, I had brought my camera and planned to do so, but i dropped it taking it out of the car and it broke. I have some before pictures of the parts i will include and that's it... Sorry.

Step One: Remove that rusty old exhaust!
I bought an OBX 930 turbo manifold off ebay for around $340 it will bolt right up to your 3.2 and looks great!

After unbolting your exhaust (hopefully none of those 30 year old studs gave you trouble) go ahead and bolt up your new one. I also removed the plate under the bumper in the back of the car during this step

Step Two: "Clock" The Turbo
Line up the outlet on the compressor housing so it goes straight into the engine bay. (I also removed the plate in the bottom of the engine bay during this step) Here is a youtube video on clocking How to clock a turbocharger - YouTube

Step Three: Put On That Shiny New Turbo!
WAIT! Before bolting it on the manifold, why don't cha bolt on that shiny new oil feed line to the top of that turbo and route it into the engine bay. I forgot to do this and it was a pain to hook up after everything else was on! Okay. Now bolt on the turbo.

Step Four: Bolt on the wastegate
Do it.

Step Five: Take off all your old intake boxes and hoses and airflow meters and set them aside. Some purist might want that airbox for top dollar on ebay.

Step Six: Drain the oil
Make sure and drain BOTH oil reservoirs I almost forgot. Also put on your new oil filter.

Step Seven: Go drink some water and get your wife to make you a sandwich. The next step sucks and you want to be properly fed and hydrated for it.

Step Eight: Connect the oil feed line.
This is probably the least fun part of the project, but if you are used to pulling engines and doing things like that it will be cake. I Highly recommend removing the intake manifold to do this I somehow did it without doing this step but it was nearly impossible. Okay find the oil pressure sending unit. It has a single green wire plugged into the top of it and is in the near center of the very back of the engine bay. unplug it and try to fit a socket on it or wrench and take it off. Now use the brass fitting that should have come with your oid feed\return line kit and screw the 1/8 -6 AN adapter on it. Now screw the brass tee in the spot where the sending unit went and the screw the sending unit on the top of the tee. Now screw the -6 AN hose into the adapter fitting. You now should have a working oil feed for the turbo. Sounded easy didn't it? it's not.

Step Nine: Connect the return line
Screw the 20mm to -10 AN adapter where your drain plug went and then connect that to your 10 AN Stainless hose that came in your kit. Now connect that to your turbo oil outlet. Easy peezy.

Step Ten: Remove the heater fan thing
It's on the left of the engine bay, it's easy to unbolt. Do it.

Step Eleven: Connect The FMU
In the very back of the left side of the engine bay you will see a fuel line that goes back towards the front of the car. Near the back of the intake manifold there is a place to unbolt this hose. have a rag near the bottom and unbolt it, some fuel WILL leak out but it's all good just be careful where you flick your cigarettes. Now use all those 6 -AN to 16mm adapters and make your 6 AN hose. Connect it to put the FMU inline with the fuel return line. It's easy, you will know what to do when you are looking at it. Now that the FMU is inline with you fuel system mount it somewhere ( I mounted it where my heater fan thing used to be because i live in hawaii and don't need a heater anyways.

Step Twelve: Route the intake
You Are on the Home stretch!!! put your adapter coupler on the turbo and figure out how you want to route the intercooler piping. (FYI I did not use an intercooler in my set up but you do not need one for below 7psi, I bought an ebay intercooler piping kit and it had MORE than enough pre-bent piping and couplers to make a working route to the intake.) Route the piping directly into the intake at the AFM, but don't forget to put the blow off valve adapter pipe somewhere along the line. Make sure all those hose clamps are tight, especially the AFM to intake manifold one.

Step Thirteen: Bolt On The Blow Off Valve If You Haven't Already

Step Fourteen: Vacuum Lines
Hook them up from the Stock FPR to the BOV wastegate and FMU also route a vacuum line into the interior of the car for your boost gauge.

I almost forgot to do that... that would have been silly... and unfortunate...

Step Sixteen: Hook up your boost gauge and mount it somewhere
I'm sick of typing, you can figure this out on your own.

Step seventeen: Install Your Chip or Piggyback if You Have One
For the record I do not currently run a tune but I have a 11:1 Air fuel ratio from just the FMU and the car runs strong... I still recommend some sort of tune but if you are brave or stupid (like me) you might be fine without one...

Step Eighteen: Connect Whatever You Are Using For Exhaust.
I like a straight pipe, it sounds sweet.

Step Nineteen: Smoke a cigar
You're done congratulations your carrera should now make over 300hp and decimate all.

Step Twenty: Go For A Drive!!!
On the first Drive work into flooring it VERY SLOWLY. You want to make sure the wastegate and FMU are working properly, get on the highway and stick it in 4th gear and slowly give more and more throttle while keeping an eye on your boost gauge and AFR. If all checks out then have fun and yet again Congrats!

In my build I spent $2150 all set and done and made 315 WHP at 7psi. The car runs great and sounds great. It's a good feeling pulling an STI or newer 911 in the straights. More people should do this. Good luck all!!!!

Last edited by Kyle Saenz; 12-02-2011 at 08:42 PM..
Old 11-26-2011, 02:05 PM
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Registered User
Kyle Saenz's Avatar
Join Date: Nov 2011
Posts: 55
here's some cell phone pictures of the car shortly after i got done. ( not the permanent exhaust, it was just a pipe to get me to a muffler shop.)

here's a boost gauge i made out of a spare factory clock, the white hand is still adjustable and is set at 7psi.

Old 12-09-2011, 11:41 PM
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Registered User
Join Date: May 2005
Location: Houston
Posts: 3,978
Very cool! Great post and congrats on your conversion to the boost junky addiction!

Ole Skool - wouldn't have it any other way
Old 12-10-2011, 02:29 AM
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Ruflife's Avatar
Join Date: Nov 2010
Location: St. Louis, Mo
Posts: 177
Have any pictures of the Engine bay? what did you end up doing for a muffler?
Old 12-11-2011, 03:15 PM
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