Custom tune for 3.4 Camaro?

[87SC/SS]

Hey all,
I'm running in to an issue. I have a chunk of change tied up in a healthy built 3.4 for my camaro, but I can't find anyone to tune the PCM. The car runs ok, but I know its losing a lot of hp becuase of the stock fuel and timing maps. Anyone know of someone that can tune these pcms? Engine specs are below.

3.4 block bored .030 over
Hypereutectic pistons w/ moly rings
Factory rods (recon'd)
Pocket ported iron heads
Comp springs
Comp 1.5 roller rockers
Edelbrock Performer Plus cam (112/107, 204/214, .420/.442)
17# Accel Injectors (had 21#'s but it was running waaaay too rich)
Holley AFPR (Someone recommended that I ditch it for the factory FPR)
RKSport Headers
High Flow Cat and 2.5" Flowmast Cat back
Factory Fuel Pump w/ 175,000 mi (LOL could that be part of the problem?!?)

So anyways the motor is breathing much much better now, but I can't get an even fuel ratio through the revs. The fuel pressure is all over the place. I'm sure timing isn't optimal. I'm sure with that much of a cam it needs a retune

Thanks in advance,
Brian

[BMC]

Brian,

So far, I have not found anyone to reprogram these for any of ours but these same PCMs are used in 94-95 Luminas, grand ams and many other FWD cars with aluminium heads and other variations. We have not dyno tested the difference but know the ones we have used have worked fine.

Another item you could look into is a piggyback ignition or piggyback fuel computer. I have installed one and it looks pretty simple to tune, but let my brother deal with that. It is commonly said that the 3.4L runs a bit rich at higher RPMs and I have heard many people say this is the way GM sets up quite a number of thier motors that way. By leaning or enrichening some motors out at midrange or the upper end, you can gain a few poinies. I don't know how good/bad piggyback units would be for Supercharged/turbo, but I like the idea alot after the install.

I would love to know where you were able to find Hyperutectic pistons for this motor. The last time i looked for Hyperutectic, they were not available, but that was 5 years ago. Do you remember your source for those?

-BMC. (another Brian)

[BMC]

here is one source or a piggyback:

http://www.alamomotorsports.com/apexi/safc.html#safc2

[Fierofreak00]

http://www.gmtuners.com/ Try these guys.-Jason

[FunkZ]

I tried that GM Tuner site (Sinister Performance) and Ryan confirmed that they cannot tune this PCM.

As for piggyback, there are a few people who are using Megasquirt, however the DIY nature of this along with a few "trouble" spots has kept me from going that route.

Brian I am interested in the unit you were able to hook up to the 3.4 and successfully get working? I read the product description and I would have 2 concerns, 1) does the unit have any effect on the PCM when running in open loop - as I have tried larger injectors and it simply runs too rich at startup when the PCM is running off a preprogrammed map, and 2) is the fuel map customizable, ie. possible to remove fuel at lower rpm's and add at upper? The product description mentions 15 selectable maps. It also does not list any GM vehicle on its list of compatible sensors.