I need a custom chip.

[Guest]

88 fiero wtih a 2.8 v6 with a GEtrag 5 spd. i am running a custom dual tb setup and headers. I installed 19# injectors so that I dont' run lean under the nitrous but my goodness even with the nitrous I am way too rich. Had a wideband hooked up this past week and my a/f ratio at WOT was at 9.5:1 so yea way too rich.

So I am looking to have a chip burned and just have 15% of the fuel taken out across the whole board. Is this even possible?? I am looking to get an SAFC as well for fine tuning but thought I could do both just to help it out a bit.

Timing and everything else I want to stay the same. I just want about 15% less fuel. I am guessing pulse widths just need to come down a bit. Just so that its about 15% less fuel throught the whole rpm band under WOT as well as part throttle. Like I said is this even possible to program?

Also if it is possible what are we looking at as far as costs go.

Sorry I dont' have the prom number but like I said standard Feiro comptuer with a getrag 5 spd. Maybe that info is on file somewhere already.

Good news or bad news just give it to me straight up.

If one needs to see the wideband graphs and the ratios let me know i can post them or email them to you.

Thanks

Shaun

[SappySE107]

I could help you with the FWD computer but I have nothing on the fiero. I dont even know the code mask for the fieros, so im completely at a loss at the moment. Hmmm, I am going up north tomorrow though to talk to norm about fieros, DOHC engines, and whatever else. Ill have my eeprom reader/writer on me so MAYBE I can get a copy of a fiero chip. It would have to be an 88 though I bet. Like I said, I am clueless on the fiero code right now, and all I know is 88 changed suspension. I bet there is a ton of fiero stuff online already though so with a 4 letter chip code (BCC) I would have a start.

Cost? I am sure someone else can help you sooner than I can learn everything at once. If I am able to do anything right away, it would be easiest to just change the fuel constant and try that. You will have to have someone local tune it for sure to do it 100% right. If you wanna learn it and do it yourself, this is a good place to start. Ill help you as much as I can.

[RacerX11]

There are several tools that are already developed to work with the Fiero ECM. Ludis' site has the Fiero chip codes: http://www.cruzers.com/~ludis/fieroprom.html

I have some of the Fiero BIN files at work. I also have one of the software packages insalled at work ( I think it is GMECM) that supports the Fiero chips. I'll check on Monday.

Marty

[Guest]

yep looks like that link shows the prom codes. So I guess if anyone has those on file that would be cool.

I might have to look at Dennis Lagrua, or call up Westers Garage in canada and see what they can do for me.

Any news RAcerX11?

[RacerX11]

I have the '87 GT 5spd BIN (APN0154). It might work OK for an '88. I also have a BIN labeled "88FIERO.BIN", but I am not sure which one it is.

The software package I have is GMEPro made by Terry Kelley. I downloaded it a year or two ago, haven't played with it much at all. He offered a free version that has some limited support for Fieros, and then a full-blown version that supports everything. I can't find the site where I downloaded it from. I thought I read somewhere that his software had been merged with TunerCat or something. The last email I have for Terry is: terryk@foothill.net Or, his username is TK over on Pennock's Fiero Forum. You are probably better off asking over there, since there are quite a few guys already tweaking the Fiero ECM (Dennis being one of them).

Marty

[Guest]

The only difference I know of on the 88's from earlier years is that the the 88's have the rev limiter removed. I have taken it past 7k a couple times already on the bottle when I have missed shifts. sO I guess having a little rev limiter in there isnt' a bad thing. I have no doubts that the 87 chip will run my car.

SO is it possible to take out 15% of fuel across the board? Excuse the ignorance but I have no idea on how programming of these things take place. I know how they work and all but never seen the programming for them and how its all done.

Shaun

[bszopi]

There are probably a few ways to do it (Ben would know the best way). From my limited knowledge and experience messing with the tuning, you could either change the fuel constant (like Ben said) or go into the fuel map, get the values for the different points across the map, divide them by 1.15, and plug the new values in.

[SappySE107]

Would be easier to change the base VE table and not fuck with the 3D fuel table. The constant will change your idle fuel...and I have NEVER had a simple change such as cutting a set amount across the board work out too well for every RPM/idle range. That includes just changing the fuel injectors to a larger amount. It may be better overall but its still gonna have an issue somehow.

[Guest]

i figure doing that could get me close. Just pull the injector pulsewidth down by 15% maybe? Would that possibly work??

I do have graphs of my wideband results if you guys would like to view them.

Shaun

[gpse3400]

Or you could drop the injector size a hair in the meantime so you don't like wash out the motor in the process. Granted you'd lose the investment of the #19.