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Thread: What's Your Opinion

  1. #1
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    What's Your Opinion

    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 ?

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    Fuel Injected! gregs78cam's Avatar
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    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.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

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    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 .

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    Fuel Injected! PJG1173's Avatar
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    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.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

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    Quote Originally Posted by PJG1173 View Post
    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.

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    Fuel Injected! PJG1173's Avatar
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    Quote Originally Posted by Hard Driver View Post
    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.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

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    OK,if the connectors are that easy to find I'll grab em next time at the yard.

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    personally, i'd never touch an ECM that outputs anything less than 8192.

    to that effect, the EBL would work to get around that. Dimented24x7 also released a patch that made one of the old TBI ECMs comm at 38,400 baud.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    RIP EagleMark's Avatar
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    Quote Originally Posted by RobertISaar View Post
    Dimented24x7 also released a patch that made one of the old TBI ECMs comm at 38,400 baud.
    Man that is fast! Wonder how long the old ECM could keep up though without having a heart attack/overheat/smoke and fire? Would be like overclocking a PC CPU but need extra cooling!

    Yeah you could tune with the old ECM, been done many times. But even then same engine with upgrade to newer PCM is better and it's not that hard to repin and change a few wires from knock/ESC module because newer PCM has knock module in memcal. Since your a V6 getting the right memcal to start with should be easy as well at JY while getting PCM plugs.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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    the '8063 as used in TBI F-bodies running $4D.

    quite a few upgrades to the code... and technically it's not a patch, it's the ASM of the entire calibration/algorithm section. could be run through an assembler and sorted out to make the 4KB BIN though.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    Ok,it seems I jumped the gun by buying the 7427 / 5.7 engine,no problem I a can probably sell it and get my money back.Since I need the connectors I can get another but is the one from a 4.3 better ? I read one post that said one from a 305 [drop two cyls] was better because it would be closer to the same bore as a 3.4 engine.

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    Fuel Injected! PJG1173's Avatar
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    if the memcals are interchangeable between 7427 and 8625. I have a 4.3 memcal I'll trade you for your v8 one.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

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    Quote Originally Posted by PJG1173 View Post
    if the memcals are interchangeable between 7427 and 8625. I have a 4.3 memcal I'll trade you for your v8 one.
    I'll have to research that, I have no idea,maybe some one will enlighten us.

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    Fuel Injected! PJG1173's Avatar
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    Quote Originally Posted by Hard Driver View Post
    I'll have to research that, I have no idea,maybe some one will enlighten us.
    I'm sure someone will.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  15. #15
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    They will interchange, the 7427 and 8625 are nearly the same thing.

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