It's my understanding that the Jbody 2.2 guys that have used piggybacks seem to have success with the ignition control using an smt6 system. As far as I know, the outbound ignition signals are identical to any other ecotec pcm, the only difference being the inbound CAMOUT signal, which is provided by the compression sense ignition module instead of the cam sensor. The PCM detects engine phasing with a combination of CKP and CSI Module derived CAMOUT on/off signals. This "shouldn't" affect any type of aftermarket piggyback, but I'm looking for a stock wiring harness diagram to be 100%. Also, with a compression sense system, a coil on plug is still used, the only change is how engine phasing is determined.

Editted for clarity.

 

I guess doing this is considered spending a crap load of money.

 

Depended on the Jbody motor/computer. The ECOTECs didn't really have much of a success...every year, the computers changed a bit more. I had an piggyback on my sunfire and it "seemed" to help as far as my original rich issue. On the JBO, we came to the conclusion is that the 04+ don't respond to it as far as adjusting cause of the programming. The 03s were sometimes responsive, sometimes weren't. The 02s seemed to be the more leanient of the bunch when it came to adjusting anything (Piggyback, FMU etc).

Yes I know, seems very vague but you're also talking about a seemingly "public forum response" on the issue. Not concrete but the best results we could really come up with.

 

Which piggyback system(s) did you use?

 

An SAFC-2

Also, I had an 2003.

 

I didn't think ignition timing could be controlled by an SAFC2. I was under the impression that it countered knock by richening the A/F.

 

It just adjusts the signal from the MAP sensor. No ignition adjustments.

 

For fueling..esp for turbo...yall should run a port fueler setup like hahn is/does offer..stock driveability + boost response.

Otherwise a return line kit and AFPR has been devistating for 1st gen neons...we got em down to the low 11s with just bigger injectors and a boost referenced fpr

BTW halfcent check ur email i found those smt diagrams for lsj for reference

 

The cobalt/ions have 2 modules...a pcm and bcm...the bcm is located under dash, pcm in engine bay...the power steering rack is a function of the bcm

 

^ Nope, power steering gets it speed signal from the PCM. So it won't work without it.

 

ok...but with a piggyback that signal wouldnt be touched so itd work fine

also i sent u that smt diagram in email like 5 min ago

 

After digging through everthing, imo the "easiest way" to add any boost at this time, would be using the MSD ignition mod and SAFC like NJHK used. smt6 would prolly be a better way to do it, more control for the win, but not as easy as the other ways.