97 Sonoma SYTY Conversion

JSM

JSM

Active member
Re: 97 Sonoma SYTY Conversion

The thing I woudl be watching for on the 97 ecm is the MAF readings. Do they max out? If so, then it will go lean, question is how much?

If not, then you need to log/record what actual wideband o2 readings you have at each level. I am by far NOT a MAF expert though. I do know the syty ecm decently well and how to tune it though.

Guess the end of day story is what is the AFR running, and knock.
 
George Blake

George Blake

DONATING MEMBER
Re: 97 Sonoma SYTY Conversion

You should probably have gone to the syty ecm anyway. It appears to be the most disassembled and well know ecm to date. Guys can pretty much do anything with it. Even datalog WB o2 readings through it. Others have run DIS through it. Writeups on the internet to run high impedence injectors with it. It is VERY versatile to be such an old ecm.
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
The thing I woudl be watching for on the 97 ecm is the MAF readings. Do they max out? If so, then it will go lean, question is how much?

If not, then you need to log/record what actual wideband o2 readings you have at each level. I am by far NOT a MAF expert though. I do know the syty ecm decently well and how to tune it though.

Guess the end of day story is what is the AFR running, and knock.
Click to expand...


Thanks for your help again. I know that it was leaning out too much prior to the rebuild, it wasn't hard to tell. Once it's assembled I will follow your advice and monitor it closely with the computer to see what it's doing. If the other mods that we have made do not resolve the issue then I will switch ECM's.
 
JSM

JSM

Active member
Re: 97 Sonoma SYTY Conversion

Would just hate to see you lose another motor trying to prove everybody wrong that the 97 ecm can do it. (which I agree with enough R&D, money, time and motors could probably happen).

I am with you in the "Tell me I can't do something and I will prove you wrong!" though.
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
Would just hate to see you lose another motor trying to prove everybody wrong that the 97 ecm can do it. (which I agree with enough R&D, money, time and motors could probably happen).

I am with you in the "Tell me I can't do something and I will prove you wrong!" though.
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I will change it before I loose another motor. Believe me. I may be crazy but not that crazy. I just can't believe that it won't work. What about running two ecm's? Have you ever seen that done?
 
JSM

JSM

Active member
Re: 97 Sonoma SYTY Conversion

I run 2 ecm's in 2 different syty's. The stock ecm runs the engine, I have a newer ecm piggy backed to run the tranny shifting (4l80e).

The 97 you have probably needs the tranny (if you have auto), and may need it for guages, etc. You could piggyback for sure.

I would give timing control to syty ecm as well as fuel. Run a map sensor for syty side so that at higher boosts the ecm can pull timing (something I doubt your 97 ecm can do since it wont' see more than 0psi boost without a code hack).
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
I run 2 ecm's in 2 different syty's. The stock ecm runs the engine, I have a newer ecm piggy backed to run the tranny shifting (4l80e).

The 97 you have probably needs the tranny (if you have auto), and may need it for guages, etc. You could piggyback for sure.

I would give timing control to syty ecm as well as fuel. Run a map sensor for syty side so that at higher boosts the ecm can pull timing (something I doubt your 97 ecm can do since it wont' see more than 0psi boost without a code hack).
Click to expand...

Cool I figured that someone had done this here. I have seen it done on a couple of track cars, but didn't know about this application. Seems like it would work great though. I think this will be the route that I will go if our initial plan does not work. Remember the only reason why I am being so stubborn about using the 97 ECM is that fact that I have to fool the Emissions Test here (no cat = no choice).
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
I run 2 ecm's in 2 different syty's. The stock ecm runs the engine, I have a newer ecm piggy backed to run the tranny shifting (4l80e).

The 97 you have probably needs the tranny (if you have auto), and may need it for guages, etc. You could piggyback for sure.

I would give timing control to syty ecm as well as fuel. Run a map sensor for syty side so that at higher boosts the ecm can pull timing (something I doubt your 97 ecm can do since it wont' see more than 0psi boost without a code hack).
Click to expand...


Just curious since you have done it. Do you have any info on piggy backing the ecm's?
 
JSM

JSM

Active member
Re: 97 Sonoma SYTY Conversion

Yes, but the info I have is tailored toward the truck having syty ecm, with other ecm piggy backing it. With piggy ecm being a different ecm than you have. Won't help you much.

If using the 97 ecm only for emissions, why not make adaptor harness, so you can just plug in a syty ecm for driving, plug in the 97 when you need to get a test done.

Unless you have a 4l60e then that is different story.
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
Yes, but the info I have is tailored toward the truck having syty ecm, with other ecm piggy backing it. With piggy ecm being a different ecm than you have. Won't help you much.

If using the 97 ecm only for emissions, why not make adaptor harness, so you can just plug in a syty ecm for driving, plug in the 97 when you need to get a test done.

Unless you have a 4l60e then that is different story.
Click to expand...


I like that idea even better. I'll check into doing that, especially since we are only required to test once per year. Thanks again.
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

JS Manufacturing said:
Yes, but the info I have is tailored toward the truck having syty ecm, with other ecm piggy backing it. With piggy ecm being a different ecm than you have. Won't help you much.

If using the 97 ecm only for emissions, why not make adaptor harness, so you can just plug in a syty ecm for driving, plug in the 97 when you need to get a test done.

Unless you have a 4l60e then that is different story.
Click to expand...

Any tips on finding a syty ECM chipped for my build in a hurry? I really don't have a great deal of time before I am ready for it.
 
DonHo32

DonHo32

New member
Re: 97 Sonoma SYTY Conversion

QUICK STORM said:
a few more pics


Click to expand...

I took RENZ advice and added a scoop to the intercooler (pic 2). It's probably only going to be about 3" from ground so we will see how long it lasts.
 
M

MikeRenz

not stock
Re: 97 Sonoma SYTY Conversion

yea i noticed that pic :tup: looks nice...although i woulda wanted a slightly bigger gap. But that'll at least work better than nothing!
 
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