I'm in luv.
I sure wish one of the software guys could adapt a 8051 (95ish LT1 PCM) to work with a distributor. Or someone to run an optispark off of the distributor drive.
Flash PCMs are just insanely nice to work with. I've been playing with one without using the MAF, and just in MAP mode, what a neat setup.
Even if it lost the SEFI, it would still be nice. Interesting seeing what the individual cylinder trim numbers are.
Cheers

 

Grumpy , why not just stick a twin encoder disc into your dizzy and graft the photo encoder inside ? , the PCM doesnt need to know its not mounted on the front .

 

Interesting, i'd be up for the challenge had someone done such a thing.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

Would take a modified housing, the disc is like 3.5" in diameter. Making it any smaller makes the high resolution slots impossible to work with.
At times, I wonder about using an addition sensor in the dissy, for the cam reference, and then using the FUEL eDist. I think MSD even makes a dissy with a synch sensor in it now.

 

explain to me what the twin encoder disc, etc stuff does. I've seen people mention it on the mailing list but never understood what it was.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

Grump In a way GM already did that. They used the distributor for the cam sensor and installed a crank sensor in the timing cover. This was SFI on the Vortec 5.7 engine for the trucks.

 

Nope, entirely different, and the other half of the story is code differences. The code from the votecs ain't nothing like the LT1 as far as the ignition goes. The LT1 can sych up in 45d of crank revolution where as the normal cam sensor stuff can take almost 2 turns to do it at times.

 

Street and Performance has a retrofit to adapt SEFI and the '95 PCM to an older TPI vehicle. It has already been done. Not sure about how they handled the distributor situation. But, I do remember that you needed to swap to a different distributor. This info was posted on one of the old thirdgen boards a long time ago. I downloaded the article but have lost it. Was pretty cool.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org