Power gains

[Bridgetown]

I have got a '02 3400 going into my fiero. I was just wondering what realistic gains I will see from my mods. The engine is running off the ECM from a '94 firebird 3.4
Modifications:
A/C, power steering deleted
62mm throttle body
adjustable fuel pressure regulator
CAI with hi performance dry filter
Truleo headers (ported to heads)
2.5 exhaust w/ free flowing muffler (no cat)

[bszopi]

No matter what mods you have, you are being limited by your ECM and it inability to be tuned. Swap in a different ECM (tunable), get it tuned, and then you will see decent gains from your mods.

[Bridgetown]

Such as?

[bszopi]

Such as the ECM or the gains?

ECM - 7730

Gains
A/C, power steering deleted - 1-2hp
62mm throttle body - 1-2hp if the intake isn't matched to it, maybe 5 if it is (depends on if the engine needs more air or not)
adjustable fuel pressure regulator - could hurt if you not adjusted correctly
CAI with hi performance dry filter - 2-3hp, depends on routing
Truleo headers (ported to heads) - 5-7hp maybe
2.5 exhaust w/ free flowing muffler (no cat) - 3-5hp

[Bridgetown]

I was asking for both, thanks.
I have been looking into the '94 ECM and some people say you can tune it.
Here is a quote from fullthrottlev6.com

"Why get MS? Like I said, you can tune the OBD1 ECM you have just the same. Go to Moates.net and get an ALDL cable, chip burner, chips and a chip adapter. Then go to TunerPRO.com for the software, and you are tuning"

Is this correct? I would rather do that then convert to the 7730 because I lose SFI and I don't want to do any more wiring. You see, I baught the setup from another fiero owner and it is basically a plug and play setup. I would like to be able to tune it for current and future mods though.

[Bridgetown]

Now I'm confused. I was just looking at the service # on my ECM it is: 16196397. Is this OBD-1 or OBD-1.5?

[bszopi]

I am almost positive that the 6397 ECM is an OBD-1.5 unit that is for the most part untunable. I say for the most part, because there is a guy out there that can tune them to an extent, but nowhere near what is possible with an OBD-1 or OBD-2 setup.

http://www.autopart.com/ecc/ECC1993OLDSMOBILECUTLASSSUPREME.htm

Second ECM down. If that is what yours looks like, then it is FLASH based and is OBD-1.5.

[Superdave]

any computer operating SFI is OBD1.5 or OBD2. SFI only helps smooth out the idle, it shuts off above 2K RPM and reverts back to batch fire just like the old MPFI computers. There is no performance gain with SFI.

the Camaro 3.4 tune is terrible, even worse when ran on a 3400V6 since the top end of the engine is completely different and makes tons more power. The engine would run really lean.

There is a replacement ECM from GM with a different service number, we put one from a 94 Z24 into a 92 Sunbird, it looks identical to the '7730 and runs $A1 just fine. I'll bug v6bluebird later and find out the exact service number.

[IsaacHayes]

The firebird 94 and 95 ECM is the same as the 3100 FWD ECM's, OBD1."5" and it's flashed based with no support for tuning it. The guy that can edit it, uses a hex editor, to remove the top speed limiter and basic stuff like that.

And yeah the 3.4L camaro ECM has programing for IRON head motor, with terrible flowing heads. So that means the VE tune is way off, and on top of that it has TONS of spark advance since the iron heads are not a fast burn head like the aluminum 3400 heads are.

You'd be better off swapping an L body ECM into it. It *should* plug and play. That way it would be a 3100 small port tune, which will run a 3400 decently.

But even better is swapping to a ECM that you can tune.

[bszopi]

I think the ECM Dave is talking about is the 16149396. Its basically a 7727/30 with double the RAM.

[Superdave]

I think the ECM Dave is talking about is the 16149396. Its basically a 7727/30 with double the RAM.

that rings a bell...



on a side note, i forgot that the Grand National was SFI and of course it was OBD1.. Probably useless info though.

[Bridgetown]

What about piggybacking a megasquirt? I have heard talk of this before. The car is a five speed so no trans controller needed. Would that work? Also, could someone elaboratte on this

"You'd be better off swapping an L body ECM into it. It *should* plug and play. That way it would be a 3100 small port tune, which will run a 3400 decently."