What's Your Opinion

[Hard Driver]

My vehicle is an 87 S blazer[stock engine was 2.8]with a 3.4 crate engine,engine came with a mild 260 upgrade cam and I added a larger 4.3 tbi and freeflow catback.I had picked up a 7427 ecm but after some reseach I feel that the stock ecm w/chip would probably handle the needed tuning for these mild mods.I can save the 7427 ecm [5.7] for another project or mostly likely sell it.What is your opinion ?

[gregs78cam]

If it were bone stock then I would say keep the stock ECM. If you think you're going to spend some time tuning it, and the stock ECM is a 160 baud, then I would upgrade it, there is no reason not to. Tuning is much easier with a faster PCM. Such as, you can see transient conditions easier i.e. lean spikes or bogs, and BLM datapoints fill in much quicker with more samples. Also there are MANY more items to monitor in the datastream for troubleshooting and tuning.

[Hard Driver]

It appears that I may have to scrounge the connectors for the 7427 and rewire to fit,I thought that if the stock ecm could be tuned to handle the engine requirements it would simplify things .

[PJG1173]

I run the 8625 in my S10 which is the MY before the 7427. I like it and have had no problems tuning it, at least none that couldn't be solved by other members here. IMHO its well worth the upgrade.

[Hard Driver]

I run the 8625 in my S10 which is the MY before the 7427. I like it and have had no problems tuning it, at least none that couldn't be solved by other members here. IMHO its well worth the upgrade.

So you are running the 8625,which appears to be for a 4.3 and it allows you to tune correctly? I know from reading the the 7427 is the more "tuneable" ecm but I don't relish the idea of scrounging the yards looking for the right connectors and splicing them into the existing harness if a tuned stock ecm will serve my needs.

[PJG1173]

So you are running the 8625,which appears to be for a 4.3 and it allows you to tune correctly? I know from reading the the 7427 is the more "tuneable" ecm but I don't relish the idea of scrounging the yards looking for the right connectors and splicing them into the existing harness if a tuned stock ecm will serve my needs.

I upgraded to the $0D mask a while back with a bin from a 7427. the good thing about these PCM's is the abundance of tuning support in the community. Not sure which ecu you have stock but I doubt it has the same amount of support as this one does. I'm getting ready to do an EFI conversion on my toyota and I'll be using another 8625 wasn't too hard to find the wire connectors in a JY. all 93-94 S10's and astro vans, or 93~95 full size with the 4l60e will have what you are looking for. watch out for the 95 s10's sometimes they have the wierd ODB1.5.