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Turbo 7a prep

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 Post subject: Turbo 7a prep
PostPosted: Sun Apr 19, 2015 5:52 pm 
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Stuck in first

Joined: Sun Dec 21, 2008 7:26 pm
Posts: 24
Location: IA
So I've made the decision to revive the '90q 20v. I've kept this car for the last 17 years with the intention of doing a turbo swap.
My plan is to use the 7a block. I've sourced 3b intake manifold, FPR, fuel rail, exhaust manifold, turbo, waste gate and wiring harness.

This is where I need help. I've searched for a long time and can't seem to find a build thread for a 7aT.

I need a 3b water manifold right? Is it just bolt on, plug n play?
I know I need oil line. Tap into the pan? Or just find a 3b pan?
Compression lowering gasket.
Intercooler setup.

What else am I going to need to make this work?
How about ecu? Can I use the stock and have it tuned or am I going to need a 3b with that harness? Standalone...although pricy.

Thanks in advance. Hopefully this can help others as we go along.

_________________
'01.5 S4 stg 3 gt28rs
'01.5 S4 avant daddy car on Coilovers
'01 Allroad mommy car
'07 Touareg wrecked
'90 90q hibernating


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 Post subject: Re: Turbo 7a prep
PostPosted: Sun Apr 19, 2015 9:41 pm 
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kickin' tires'n lightin fires
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Joined: Wed Oct 29, 2008 7:00 pm
Posts: 625
Well right off the bat the water manifold doesn't bolt it. You would have to have your head machined to accept it, but you don't strictly need it. People run turbos without the water manifold. You're also not going to be able to use the 7a ecu as far as I know. Best best is to just find a 3b ecu. Shouldn't be too hard. I even have one in the garage I would be willing to sell you. come to think of it I have a k24 turbo and exhaust manifold too if you haven't already purchased yours. To be honest I'm not 100% sure about the oil lines, but you not only need a send/return oil line, but you also need coolant lines to and from the turbo.

I also have an aluminum flywheel for a 7a from spec with a couple thousand miles on it as well as a stage 3 clutch and pressure plate. Let me know if you're interested in any of those and good luck with the swap!


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 Post subject: Re: Turbo 7a prep
PostPosted: Mon Apr 20, 2015 5:58 am 
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mach 2 with my hair on fire
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Joined: Sat Oct 22, 2005 8:23 pm
Posts: 1745
Location: Pittsburgh
If I was going to do this, I would source an S2 3B or ABY engine harness to make the wiring a mostly plug and play affair.

_________________
2003 BMW 330i ZHP 6spd [-SOLD]
2006 Volvo V50 T5 AWD 6spd [DD]
1990 CQ [S2 Project]
1996 Passat TDI -SOLD
1990 CQ -SOLD
1995 Audi S6 -PARTED
1993 90 quattro sport [gf's car]-SOLD
1989 80 quattro [DD/first car]-SOLD
1984 4ktq project -SOLD

http://www.coroflot.com/hansnielsen


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