i dont know anything really about the computer in my camaro.......

when i change something for more power, am i gonna need to get a new computer chip each time i do????

this is something i dont really understand

any help would be cool

 

No u dont just disconnect your battery for 10 mins and re connect it and go for a 30 min drive NO WOT your computer will automaticly adjust to the mod u did its self learning. I got my airintake and its hooked up i just need to send it to you now when i get off my lazy *** lol but also can i take the IAT sensor off it you have one allready and i lost my old one is that ok?

 

yeah, FAST RS, no problem,
i just need you to do me a favor and let me know what sensors you hooked where on the intake......

also i think i am going to put it on, see how it performs, and if the radiator does heat it up 2 much, then i am going to go get some insulation from home depot

but will re-setting the computer work for everything i am going to be doing.....like the 3.4 swap with raised compression and a BIG cam???

 

A big cam no then u need a costom prom cop cam 2030 i herd works but i dont know what else mihgt

 

For the 3.4 swap, you DO NOTHING except interchange EXACTLY EVERY ITEM FROM THE PREVIOUS ENGINE.
That is the true beauty of the 3.4 swap.
You change alot, and keep everything you had including the original in your car now computer. I did not even change the chip. IT'S ALL STOCK 1985 ECM.
IF YA KEEP THE STOCK 3.4 CAM, you need do not a single thing.
I am running my 1985 Computer and the 1995 3.4 engine.
I changed all I listed in my thread and it works PERFECTLY!

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Ked, you have MAF, 91 has SD. The eprom will have to know about the bigger engine as it does not measure airflow.

91, the problem with 1991s is that there just isn't enough information known about the "404" ecm. I am looking for someone to either let me read a 1991 3.1 Memcal or fire me off a copy of the BIN so I can check it out. I am hoping that the 3.1 guys can use the $8D Editor that we SD TPI guys use. If so, then modifying the BIN for a 3.1 F-body will be a snap.

Just not enough V6 guys are willing to explore PROM Burning, and us V8 guys don't have access to a V6 to check them out.

 

All I can offer is someone had a 1990 and did this swap.
No problems reported.
What could go wrong, if ya using the same previous engine management system?
The computer cannot deduce that a larger engine is under it, as is the same sensors are in the same location, reporting the same information.

------------------
Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

No, SD needs to know the displacement of the engine to determine the correct injector pulse width. Same with any other mod like heads, cam, etc that increase air flow when you have an SD car.

 

I dont see where the SD would cause a problem with the 3.4 displacement. After all, a 3.4 is simply and over bored 3.1. If you take your 5.7 TPI SD and overbored it .060 I dont think you wouldnt have any problems. The 3.4 cam is the part I would worry about, but even if it doesnt work get a crane 2030 and be done with it.

 

well, i mean i am planning on building this motor out big time..........big cam, higher compression forged pistons and rockers.......those are the first things to be done.........if i get a custom chip to handle all this, will i need to change it when i add, say, nitrous or MSD or whatnot....??

 

Well, 3.1 to 3.4 is a 10% increase. A 350 to 383 isn't even a 10% increase and they generally need a new PROM. Trust me, unless you change the "Cylinder Displacement" with the SD eproms, it has no way of knowing you are "10% bigger" and you run "10% leaner" than you did before @ WOT.

Part throttle the ecm will correct, but you can trigger an O2 Lean SES code a lot sooner due to the 10% disadvantage in not having the proper "Cylinder Displacement" defined in the eprom.

[This message has been edited by Glenn91L98GTA (edited July 12, 2001).]

 

hey glenn, meet the real glenn, and my camaro way of life......

(sorry i had to say that cuz my name is glenn 2)

i'm really sorry, but i hate to say that i just dont understand any of this camaro-computer stuff........hope to soon though.........

lemme put it plain and simple......is their any place i can order the chip i am going to need for my raised compression, big cammed, 3.4 ??????

 

Simple. Start stocl ignition, intake system first. Let the system tell you what troubles it has and go forward.
My swap set up told me I had a bad MAS & I changed it and life has been very happy, since.
I used everything stock. Everything.

------------------
Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Ked, MAF measures air flow, so it will compensate for the extra air needed for the 3.4 because it is highly doubtful that you will hit the 255 gm/sec flow limitation with a N/A V6. Only when you get into larger displacement V8s do you hit the MAF limitations.

With SD, the ECM calculates air flow based on a number of factors, including the displacement of the engine. If that displacement is not changed to the proper amount, then the ECM will not calculate the proper flow and run lean.

This is why "adjusting fuel pressure" or installing larger injectors became so common for SD modified motors. And it WILL WORK to a point with SD. The basic premise is that if you increase your displacement 10%, then you install injectors 10% larger. Basically, you have compensated for the change with a mechanical method.

As I said, it does work to a limited point. If it was JUST a displacement increase with basically the same Volumetric Efficiencies within the power band, using larger injectors will work. Unfortunately, displacement increase does affect the Volumetric Efficiencies and requires more "tweaking" of the VE tables within the SD prom to ensure you don't have "driveability" problems.

91, I cannot tell you where to go to get a PROM for your V6 car. I want to find someone with a 3.1 using the "404" to see if it is just an off-shoot of the 730 (which then makes all the stuff we SD V8 guys use work for you V6 guys to modify your prom). My hunch is that the "404" is just a version of the 730 since there are so MANY 3.1s actually using the 730 (early 90s Cavaliers as an example).

But, unfortunately, most custom prom writers don't deal with or have not written a PROM for a V6 so they really can't help you.

PS: When I discuss SD, this is how ALL SD systems work. The problem with not working with the "404" is that I don't know exactly which BYTES the various parameters are located. If it turns out to be $8D (with the 3.1 Cavaliers use) then life is easy because the BIN Editor for the $8D is readily available (I use it all the time) and all the locations are the same.

I know the $8D, besides have "Cylinder Displacement" as a defined constant also supports multiple "cylinders" for 4s, 6s & 8s. I suspect the difference in the "404" is the "pinning" of the connectors, not the BIN itself. GM uses the same BINs for many engines and design it to work on as many engines as possible. If I had a 3.1 V6 BIN from an F-body, I could tell you in 10 seconds what "calbration" it uses.

So 91, you real solution may be to start scoping out the DIY PROM Board. If you had a "burner" you could read your Memcal and e-mail the BIN and I could tell you EXACTLY which "calibration" it uses.

 

what would i need to burn my own PROM???

it sounds like the solution i will need, but as i said i am truly blind to it......


any help would be cool........

if it sounds easy enuff i will look into it.....