[Diy_efi] Changing the fuel and spark on a Porsche

[Alexis PAVLOV]

Porsche engines use Bosch Motronic boxes.
This one is probably of the M2.1 or M1.7 generation,
based on the intel mcs96 controller, with knock sensors.
I don't know how it's with 4cyl engines, but flat6 engines
run very high compression ratio (above 11:1), so of course
everything must be modified to use a charger.

Bosch ECU are not really simple to program, there is not a lot
of informations. In any case the stock ECU would not be able
to control the pierburg valve for boost control, so an aftermarket
ECU seems mandatory. Except if you completely re-program the box.
Sell the original box and buy a race one, they are not so expensive now.

May be it would be less expensive to sell your engine and buy
a turbo one.


"Gianmarco Rizzo (BE/EAS)" wrote:
> 
> i have done a short research and apparently is not possible to change any parameter at all in the 968 stock ECU. Also, the car runs high compression to start with so forget turbocharging it unless pistons are changed for lower comp type, and a different ECU is fitted
> 
> http://forums.beyond.ca/showthread/t-56892.html
> 
> alos check this
> www.986.net
> 
> gm
> 
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Brian MacKay
> Sent: Dienstag, 26. Oktober 2004 02:30
> To: A list for Do-It-Yourself EFI
> Subject: RE: [Diy_efi] Changing the fuel and spark on a Porsche
> 
> I agree 100%.  My current car is a Grand National so I am used to tuning
> under boost conditions.  I cannot fathom why my normally intelligent friend
> wants to do this.  He must not value his time at all.
> 
> Brian
> 
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Gianmarco Rizzo (BE/EAS)
> Sent: October 25, 2004 6:14 AM
> To: 'A list for Do-It-Yourself EFI'
> Subject: RE: [Diy_efi] Changing the fuel and spark on a Porsche
> 
> Hi Brian
> 
> fitting a turbocharger without EFI adaptations will end up in a blown engine
> very very quickly
> 
> i dont' know what ECU the car uses but i'd recommend using a aftermarket
> programmable EFI for best (and safe) results
> 
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Brian MacKay
> Sent: Samstag, 23. Oktober 2004 03:48
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] Changing the fuel and spark on a Porsche
> 
> I have a friend to races a Porsche and while he knows a lot about cars, he
> knows nothing about the guts of his EFI.  He insists on making major
> mechanical changes to the engine and doesn't consider the fact that the
> computer won't necessarily make good corrections.  He plans to turbo charge
> the car and is assuming everything will be fine without modifying the
> computer.
> 
> My background is that I regularly modify code and look up tables in my GM
> ECM but I know nothing about Porsche stuff, like what processor is used,
> does it use EPROMS, etc.  The car is a 1992 Porsche 968 therefore OBD-I.
> Can anyone point me to any references or websites where I can learn more and
> hopefully prevent him from blowing up another engine!
> 
> Thanks,
> 
> Brian
> 
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