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Registered
Join Date: Oct 2004
Location: San Jose, CA
Posts: 204
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Switch 944 NA Wire harness with 951?
Alright so here is the age old topic that has been asked MANY times before. I am going to supercharge my 1985.5 NA (roll eyes here). However, this is not a stock 1985.5 NA it has a total race suspension, exhaust, cage, racing harnesses, stripped interior, custom paint, fiberglass bumper...hood, plexi glass hatch, totally rebuild head with new cam, springs, aluminum flywheel etc. Thus this car is worth a pretty penny
 So here is the plan: I am going to lower the compression on the engine using 951 racing pistons and conrods. Then I am going to install a supercharger and run 18-20 psi. The problem is that the stock NA DME and fuel system is not meant for boost. I was thinking of upgrading the full system with a high pressure fuel regulator, bigger pump, and larger injectors. However, what do I do about the DME? Is it possible to buy turbo computers and a turbo wiring harness? I guess what it comes down to is what is the difference between the NA harness and the turbo harness other then the two computers? P.S. Please don't tell me to just go buy a 951, that is not going to happen.
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1985.5 944 NA -Racing Headers, Cat-less Borla exhaust, New racing Cam, Turbo valve springs, multi angle valve job, big bore throttle body, Eprom, blue printed injectors, throttle response cam, -Just installed: M030 Suspension with turbo A-arms and hubs. Big Reds with rotors and stainless lines. Turbo sway bars front and rear. Boxter wheels, turbo mater cylinder, and MOMO steering wheel and shift knob. Just Finished: Clutch, flywheel and transmission...and TONS more! |
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09-13-2006, 04:33 AM
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Join Date: Feb 2005
Location: Canada, Eh?
Posts: 77
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You would have to ask around about custom chips to match your setup. A stock Turbo DME/KLR wont work, since turbos have a different boost curve and thus fueling will be wrong for a supercharger and timing might be iffy.
The other option is a standalone, but thats up to you. Sounds like a centrifigal supercharger...?
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Smokey - 1986 951 2.7 liter MID sleeve big bore with Vitesse and CEP parts, Link G4 Extreme, lots more. "The first 50% of the project takes 90% of the time... The rest of the project takes the other 90% of the time." |
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09-13-2006, 08:10 AM
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Registered
Join Date: Feb 2005
Location: Canada, Eh?
Posts: 77
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And a 951 harness could be used. You would also have to switch to some 951 bits, like the TPS an Idle Valve if its different between Turbo and NA, then switch to the Turbo AFM if youre using the stock computers and add a knock sensor (should be a hole on the block for it).
Also, I think NA and Turbos MIGHT use different starter gears. Turbos have 132 teeth, if NAs have the same number youre ok.
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Smokey - 1986 951 2.7 liter MID sleeve big bore with Vitesse and CEP parts, Link G4 Extreme, lots more. "The first 50% of the project takes 90% of the time... The rest of the project takes the other 90% of the time." |
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09-13-2006, 08:20 AM
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Registered
Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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As edge mentioned........ you could use the 951 harness.... but for the trouble forget it.
.... you are much better off with standalone and your own custom harness.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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09-13-2006, 09:53 AM
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That Guy
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Just curious, what cam are you running now? Have you dyno'ed your car with your current setup?
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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09-13-2006, 10:09 AM
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Join Date: Oct 2004
Location: San Jose, CA
Posts: 204
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The only problem with stand alone is that they run $2500+ which is a bit much considering all the other things I am going to be doing. Of course if anyone one knows of a cheaper stand alone system please let me know!
Currently I am running a Web Cam in my car. Its certainly much faster then stock, but I would be surprised if it has 150 hp at the wheels. Thus far I have not been to a dyno
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1985.5 944 NA -Racing Headers, Cat-less Borla exhaust, New racing Cam, Turbo valve springs, multi angle valve job, big bore throttle body, Eprom, blue printed injectors, throttle response cam, -Just installed: M030 Suspension with turbo A-arms and hubs. Big Reds with rotors and stainless lines. Turbo sway bars front and rear. Boxter wheels, turbo mater cylinder, and MOMO steering wheel and shift knob. Just Finished: Clutch, flywheel and transmission...and TONS more! Last edited by drfatz; 09-13-2006 at 12:14 PM.. |
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09-13-2006, 12:06 PM
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Join Date: Oct 2005
Location: San Diego
Posts: 703
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I think I would go with a peggie back Fuel Controller or stand alone.
Hope you also went with Turbo Exhaust valves or stock might get a little crisp. Did you also adjust the Intake porting/valve size? 18 PSI is alot of boost. Do share what you find. Would love to here of everthing you modified or changed and specifics.
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles |
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09-13-2006, 12:13 PM
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Registered
Join Date: Oct 2004
Location: San Jose, CA
Posts: 204
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Quote:
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1985.5 944 NA -Racing Headers, Cat-less Borla exhaust, New racing Cam, Turbo valve springs, multi angle valve job, big bore throttle body, Eprom, blue printed injectors, throttle response cam, -Just installed: M030 Suspension with turbo A-arms and hubs. Big Reds with rotors and stainless lines. Turbo sway bars front and rear. Boxter wheels, turbo mater cylinder, and MOMO steering wheel and shift knob. Just Finished: Clutch, flywheel and transmission...and TONS more! |
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09-13-2006, 12:16 PM
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The Kraut Burner
The Bratwurst Burner
Das Boost
