chip finally made for the 94-95 3.4 DOHC's

[fieromadman]

OK, this has been posted in several threads and is widely known on the fiero forum, but I DO have a chip for my 3.4 DOHC 94-95 setup in the Fiero.
Some modifications that were done to my chip are:
-Pulses per miles changed for the fiero application
-VATS disabled
-power steering codes erased
-a/c delete
-auto tranny codes erased
-rev limiter raised to 7200 (im not 100% sure on this but the tuner said 7200, and a fiero tach reads only to 6500, and it keeps going past that so who knows where it exactly is?)
-there was some modificationstuning done for power but it is not completely tuned YET.

Right now I need to hook up the VSS wires to the ECM so that we can find out how that effects the chip. The only problem with the chip right now is that after you engine break while you press in the clutch I must blip the throttle to keep it from stalling. The computer is not recognizing that the clutch is being pressed in and since its revs were high at 0% thorottle it just kills. Were hoping that the speedo wires will help to resume back to idle after the clutch is depressed because it will realize that it isnt just "idleing high." If not the other thing that we could do to fix it is to hook up the clutch switch to the ECM so i realizes everytime the clutch is depressed.

I figured that i would share this information so that people will start looking at using the SFI system instead of always converting to the earlier style. The tuner that did this for me is an active member at the Fiero board. His website is www.gmtuners.com and heis very good and innexpensive at what he does.

Thanks!
Jeff Depies

--------------------
87 Fiero GT
Lowered
Rims
Custom paint
95 Monte Carlo z34 swap.
BEST 1/4 to date (with auto chip 2" crush bent exhaust and no hook up) 14.7@95 MPH

[SappySE107]

RE: chip finally made for the 94-95 3.4 DOHC

any perf numbers? I will be tuning a 94-95 MAF car in the near future and want to know what the "goal" is at the moment performance wise.

[fieromadman]

for now the performance was low priority. i wanted all the codes and driveability figuredout before i went ahead and started to get it tuned for more horsepower.

[Wolf]

is it darthfiero that dose this? I'm prolly gona need it done for the 3.4dohc i'm putting in my camaro.

[fieromadman]

yes indeedy it is. He does th earlier versions of the chip too, so if your interested. I've heard Bens chips are very good, but there is a price difference.

[95naSTA]

Yeah dude gmtuners is great.
I got a 90 degree 3.8 but still.
He got my air/fuel super close to perfect using L67(36#) instead of my stock L36 19# injectors
I'm cammed and have a bigger L67 throttlebody too.
I'm also shifting at 64xx rpm instead of 5900 on my 4t60-e.
The best part i like about gmtuners is hes gonna keep reprogamming chips for me till i get exactly what i want. That 40 bucks or so it definitely worth it.

Are your pcm's hybrid obd1/2 (obd1 with a obd2 plug) and have a removeable memcal? I wonder if you guys use the same pcm w/ a different memcal.

[fieromadman]

I know that the 94-95 PCM's are drastically different than any others with the 3.4 DOHC's It is refferenced as OBD1.5 sometimes, because its is still OBD1 but uses all OBD2 codes? Thats about all I know. He's the only one that does a chip except for domestic performance which seems sketchy and hard to deal with plus thier inflated (300 last time i checked) price was not worth it to me. Ryan came through for me, and I boast his work for that, besides he's been doing a great job so far.

[Wolf]

got that vss hooked up yet? thats one major thing I was worryed about with swapin the lq1,was my speedo being correct

[fieromadman]

I got the VSS hooked up last night, drove it to the tire shop early this morning. I didnt notice any real changes in the way the car behaved. it still stalled after pushing in the clutch while engine breaking, so i guess we'll have to add a clutch switch. No biggie. As for the speedo being correct, my speedometer in the car was hooked up to the VSS all along, but the VSS wires going to the ecm were not hooked up. My speedo has been correct, but to get the ECM to read the right speed you will need a custom chip to change the pulses per mile to 4000 (I believe). Your speedo should read correctly no matter what though, as long as its hard wired into the speedo wires.

[massmontes]

Hey i im sending my memcal out tommorow to ryan at gmtuners he told me about you and your fiero. my 95 monte z34 should benifit from him with my auto tranny. Im gonna do beta testing for him and we should get it ironed out soon enough. Anyone have any sugestions for a stock setup that will benifit my torque. as of right now he can helphe sent me this.

I run gmtuners.com and currently am in the beta testing stages for the 94-95 3.4 DOHC custom chips (including monte carlo). "Beta Testing" means that I cannot yet do a whole lot with these systems, but what I can do should work. I am currently working with a gentleman in Wisconsin custom tuning his 95 3.4 DOHC system which he has installed in a Fiero with a manual transmission. I have made many improvements over his stock program since he was having major issues considering the 94/95 engines/computers never came with manual transmissions from the factory.

With that being said, here is a list of the tables and items I can adjust on the 94-95 3.4 DOHC chips as of 3/25/2005:

Enable/Disable the Following Parameters:
-A/C Pressure Sensor Present
-A.I.R. Pump Present
-Manual Trans Option
-Pass-Key II
-P/S Pressure Switch Type (N.O. or N.C.)
-DTC P1640 QDM A Diagnostic
-DTC P0703 TCC Brake Sw Diagnostic
-DTC P0755 Shift Sol B Diagnostic
-DTC P0705 Trans Range Sw Diagnostic
-DTC P0712 Low Trans Temp Diagnostic
-DTC P0713 High Trans Temp Diagnostic
-DTC P0740 TCC Diagnostic
-DTC P1650 QDM B Diagnostic
-DTC P1626 Pass-Key Invalid Freq Diagnostic
-DTC P1530 A/C Pressure Sensor Diagnostic
-DTC P1629 Passkey II Signal Error Diagnostic

I can adjust the following parameters:
-Rev limiter in P/N, REV, and Drive
-Top Speed Limiter
-Coolant Fan ON/OFF Temps and Vehicle Speed
-VSS/Speedo Calibration
-Torque Management enable/disable RPM
-Injector Constant (base fuel)
-Decel Fuel Cutoff vehicle enable speed and max allowed RPM drop per sec

I can make changes to the following tables:
-Main Spark Advance
-Desired Idle Speed
-Overspeed Fuel Cutoff vs. current gear
-Torque Management (max allowed torque vs. RPM)
-MAF Freq Calibration Tables (fuel)
-Normal Mode Shift Points (may not affect WOT shift points)
-Second Gear Start Mode Shift Points (may not affect WOT shift points)


As I said before, I am currently working with this platform, but because I don't own a vehicle with one of these systems in it, it is very difficult to test/research custom chips for this system. I am aware that the people of the 94-95 DOHC community have very limited options when it comes to aftermarket support for custom tuning which is why I am making every effort possible to get something to market for your community concerning this issue. Having said that I do need some people to work with me on some custom chip beta testing. a custom chip cost you $40

-ryan

[Golden86]

thats great that you are testing with the auto trannies, you should have no problem and should benefit easily from the chip.

On another note, after hooking up the VSS wires and going for a drive, everytime that i would push in the clutch while going over 40 miles an hour it would die no matter what. So, we have another driveability issue with the chip, but i guess we'll just have to adjust a little bit here and there + add a clutch switch so it thinks that it is thrown into neutral when the clutch is pressed in.

Later,
Jeff

(by the way i realized that i was typing this on a friends computer and this is fieromadman, not golden86.....)

[napatiger]

ryan,

When I do the 3.73 FDR switch in my 95 MC Z34, I understand that I need to reprogram the chip to account for the vehicle speed change, you can do that?

[fieromadman]

you would have to contact ryan through www.gmtuners.com i am mearly a customer testing his product. I dont think he's on this forum.