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 My M20 early model turbo guide. 
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Post My M20 early model turbo guide.
This was a semi budget kit and should be a good guide for anyone getting ready to boost their car.

Manifold: eBay special, thin wall tubing, might not last forever, but so far so good. If it breaks, take it to a good exhaust shop to patch the welds, should still be under $300 and will be a manifold that should last forever.

Turbo: Another eBay special, i suggest against them, i got lucky and mine has lasted great and has the same shaft play as when i removed it from the box. Popular turbos for e30s are the "Holset HX35" found on turbo diesel engines.

Oil lines: I ordered a -3an feed from "fast-turbo.com" (great guys), roughly 3ft long. Drain i used an adapter plate which i can't remember where i got it from, but you should be able to find something fairly easy searching the web for "T3 oil drain flange". I bought a brass nipple from Menards, matched the diameter to a drill bit, drilled the pan directly under the turbo with it still on the car. Use a lot of grease to catch any metal shavings. I wallered the hole slightly until it was a tight fit, hammered the fitting in and JB welded it to seal it. Drain your pan before doing this as you will have a huge oil spill (i'm sure you can figure out how i know :lol:). I personally used PCV tubing sold at O'reily's, it was a perfect fit and holding up fine without getting soft or brittle from the heat and oil.

- Oil filter relocation, required for eBay manifold. I ordered a universal kit from Summit, however the lines included touch the manifold. I ordered new fittings and steel braided line again from Summit. Here is a copy of my invoice.

4: SUM-220846 8AN TO 3/8 NPT ADAPTER $2.88 $11.52
2: SUM-220887 -08 90 SWIVEL HOSE END $14.95 $29.90
1: SUM-230806 S.S. BRAIDED HOSE-8 6FT $26.95 $26.95
2: SUM-220890 8AN Hose to Female -8 AN $6.95 $13.90

I also ordered 2 of the straight -8an hose ends, i have no part number off hand, shouldn't be hard to find though now that you know what you need.

Intercooler and piping - This is why i specified it was an early model car, i tucked my intercooler behind the "cow catcher". Intercooler and piping was ordered from CXRacing.com, their kit has T-bolts, aluminum piping, and reinforced Silicone couplers, awesome deal, great quality. I used a holesaw where the factory airbox was to run the intercooler piping up through it.

Engine management - kept it simple, 22lb Ford injectors, FMU, Walbro fuel pump, SAFC.

Should pretty much cover it, any questions, ask.

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'02 Audi A4 - Returned to stock.

'87 BMW 325is - Rotting away, need a new shell!

'83 Rabbit GTI - T3 Turbo, Technix full coil-overs, BBS RAs.

'90 Audi Coupe Quattro - Enkei 92 16x7 7 offset, Scorpion(?) Exhaust.


Thu May 08, 2008 1:41 pm
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Post Re: My M20 early model turbo guide.
Whats the point of the FMU with an SAFC?


Thu May 08, 2008 2:37 pm
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Post Re: My M20 early model turbo guide.
12:1 FMU raises the fuel pressure 12psi per 1psi of boost.

SAFC controls the ~50% larger injectors in out of boost conditions.

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'02 Audi A4 - Returned to stock.

'87 BMW 325is - Rotting away, need a new shell!

'83 Rabbit GTI - T3 Turbo, Technix full coil-overs, BBS RAs.

'90 Audi Coupe Quattro - Enkei 92 16x7 7 offset, Scorpion(?) Exhaust.


Thu May 08, 2008 3:02 pm
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Location: Charleston IL / Terre Haute IN
Post Re: My M20 early model turbo guide.
I need to find a manifold for my car.

I need to find a M50 E30 turbo manifold.

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Thu May 08, 2008 3:48 pm
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Post Re: My M20 early model turbo guide.
O 16581 72452 5 wrote:
12:1 FMU raises the fuel pressure 12psi per 1psi of boost.

SAFC controls the ~50% larger injectors in out of boost conditions.


That makes no sense. Why not just make the SAFC add more fuel when you hit boost?

I guess the stock AFM doesnt like boost but then the SAFC is kinda pointless... *shrugs*


Thu May 08, 2008 4:25 pm
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Post Re: My M20 early model turbo guide.
protomor wrote:
O 16581 72452 5 wrote:
12:1 FMU raises the fuel pressure 12psi per 1psi of boost.

SAFC controls the ~50% larger injectors in out of boost conditions.


That makes no sense. Why not just make the SAFC add more fuel when you hit boost?

I guess the stock AFM doesnt like boost but then the SAFC is kinda pointless... *shrugs*


The AFM maxes out with stock airflow and sends a 5v signal to the ECU at this point. If more "fuel" is added more than a 5v signal gets sent to the ECU and it throws a CEL because it's outside the ECU's parameters.

Basically what i'm doing is maxing out the stock AFM in vacuum and the FMU takes over for fuel in boost.

_________________
'02 Audi A4 - Returned to stock.

'87 BMW 325is - Rotting away, need a new shell!

'83 Rabbit GTI - T3 Turbo, Technix full coil-overs, BBS RAs.

'90 Audi Coupe Quattro - Enkei 92 16x7 7 offset, Scorpion(?) Exhaust.


Thu May 08, 2008 4:29 pm
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Post Re: My M20 early model turbo guide.
sounds like too much money/work for an inexact thing. Should just go after market ECU.


Thu May 08, 2008 8:40 pm
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Post Re: My M20 early model turbo guide.
protomor wrote:
sounds like too much money/work for an inexact thing. Should just go after market ECU.


Fuuuuuuck that, did it once, won't do it again.

Not that inexact, i'm running a wideband.

_________________
'02 Audi A4 - Returned to stock.

'87 BMW 325is - Rotting away, need a new shell!

'83 Rabbit GTI - T3 Turbo, Technix full coil-overs, BBS RAs.

'90 Audi Coupe Quattro - Enkei 92 16x7 7 offset, Scorpion(?) Exhaust.


Thu May 08, 2008 10:05 pm
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Post Re: My M20 early model turbo guide.
protomor wrote:
sounds like too much money/work for an inexact thing. Should just go after market ECU.

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america-penny


Thu Apr 01, 2010 11:26 am
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Post Re: My M20 early model turbo guide.
protomor wrote:
sounds like too much money/work for an inexact thing. Should just go after market ECU.

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america-penny


Thu Apr 01, 2010 11:26 am
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