[Diy_efi] Typical boosted ignition timings

[Marc Reviel]

>Hi Marc,
>
>
>Could you describe a little more the engine:
>What EFI did you use ?


MoTeC M800 with Dual wideband O2. The heads are twin plugged and use 
12 individual coils for each plug.



>What did you modify in engine bottom ?


Not really (didn't need it).  Just micropolished the crank, 
microbalanced/shotpeened the factory forged rods, ARP bolts, 
boattailed the case halves.


>Does your engine have Variocam and do you use it ?


No VarioCam.  I did have the heads 'NiRisisted'.  This is where rings 
are machined into the heads and cylinder where they interlock for a 
gas-tight seal. This eliminated any head gasket failures due to 
head-lifting under high boost.


>What pistons do you use ?


Use stock set of new factory Mahle pistons, cylinders and rings.  7.5:1 CR


Basically took what Porsche produced in '94 on this Turbo, and added 
major enhancements. Massive porting/polishing of the heads to 42mm 
intakes, used cams from later factory racing Porsche GT2's.  Really 
efficient combination: generated 581hp at 0.85 bar.

  I also used a Porsche factory Cup race car clutch and single-mass 
flywheel (saved 18.5 lbs off flywheel/clutch assembly!).






>
>Thank you,
>Alexei
>
>
>marc at powerlogix.com wrote:
>>
>>  Based on a 1994 Porsche 3.6L Turbo engine/car.  Lots of head and
>>  manifold work (converted from CIS to EFI), GT2 cams.
>>
>>  Yes, 19 degrees is what some others have said, too.  581hp was run
>>  with Lambda set at 0.90.
>
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-- 
Marc J. Reviel

Director of Engineering/CTO
PowerLogix
http://www.powerlogix.com

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