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Type: Posts; User: Pekka_Perkeles

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  1. A very long time ago (2011 or so) I had a...

    A very long time ago (2011 or so) I had a customer with stock C6 Corvette having very unstable MAF signal while cruising. It did run very nicely when forcing at SD but being stock I didn't want to...
  2. Thanks. I was also wondering about spark table...

    Thanks. I was also wondering about spark table airmass behaviour. That makes perfect sense.

    Now, with E85 I will need to modify MAF breakpoint even lower, which is fine, but how about Flex Fuel...
  3. Why not just flatline MAF at 5.5 ms with?

    ?external PI fueling system?
  4. Exactly!

    Exactly!
  5. Thank you everyone for this. I think that's...

    Thank you everyone for this.

    I think that's the main issue and I will verify it tomorrow. Pretty easy just to unplug one injector and see what error code it sets.
  6. Yep! I even called the customer to explain to...

    Yep!

    I even called the customer to explain to him that those front lambdas must be crossed.

    But they weren't. I checked it by disconnecting one and got a fault code from that side as well.
    ...
  7. Yep, forgot that one (for regulated pressure)...

    Yep, forgot that one (for regulated pressure) when trying to figure out what the heck is causing this.

    For other injector data, I need to see what can be done.



    Good, question. I don't...
  8. I forgot to mention that I used hopefully a stock...

    I forgot to mention that I used hopefully a stock -99 Corvette to change most of the tune back to stock and then made some changes by myself. I forgot to change cylinder volume though, so VE is a bit...
  9. Open loop OK, but closed loop goes crazy (Procharged LS)

    This car was previously tuned by someone with bad results.

    Original tooned tune: 138732

    This is the setup now:

    - 6.1 LS engine with 10.5:1 compression ratio
    - BTR Stage 2 supercharged cam...
  10. Started to dial in VE in low throttle, low MAP,...

    Started to dial in VE in low throttle, low MAP, low RPM areas and I think I got it pretty good. But the end-result now with good fueling was a very bad idle.

    It was oscillating so much that...
  11. By the way, I'm not familiar with tuning those...

    By the way, I'm not familiar with tuning those baro tables. I guess I have to do some googling here.
  12. They are 1.9 liter Eatons. I think that the...

    They are 1.9 liter Eatons.

    I think that the reason why the idle tune seems to be ok with rather stock settings in E38 is because there's an external throttle controller.

    It is tunable as well,...
  13. Ok, got it finally running quite well. I...

    Ok, got it finally running quite well.

    I re-checked injector information from customers receipt and it stated flow matched set of EV-1100-S injectors, about 1044 cc at three bar (45 psi). While it...
  14. Twin-TB, Twin-Supercharged 408 with external fuel system nightmare

    Engine details:

    - 408 stroker
    - some custom cam
    - twin 90 mm TB?s with external controller for E38 PCM
    - twin superchargers
    - air-water-air...
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    So true.

    So true.
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    Very good.

    Very good.
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    So I added some WOT enrichment and now it seems...

    So I added some WOT enrichment and now it seems to be better. Confirmed also with WB on another run.

    Still a bit of knock and advance is not very stable at WOT. Maybe I have too many channels...
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    2017 Shelby F150 - why so lean at WOT?

    Stock tune attached:

    135674

    Stock WOT log attached:

    135675

    For me it seems to be a bit lean and also quite far from commanded lambda. Any reason for that?
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    Log also cam counts to verify it works as...

    Log also cam counts to verify it works as inteded.

    I had a very similar problem with a muscle car LS3 swap and it was all about a bad wiring that killed 2 cam sensors until it was finally...
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    By the way, do these GMPP 480/525 Crate engines...

    By the way, do these GMPP 480/525 Crate engines still have an issue with a high idle with the tune they have from the factory?
  21. I agree.

    I agree.
  22. I personally would not put advance similar on...

    I personally would not put advance similar on main tables and idle tables. It just takes ignition-based idle control away and makes engine sluggish when getting car rolling from the standing start. ...
  23. You didn't post your tune. Anyway, I doubt and...

    You didn't post your tune.

    Anyway, I doubt and if it is E38, the cylinder volume has no impact. It's part of GMVE already.
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    Did I just brick my E38 PCM?

    Long story short,

    This is a 69 Camaro swap car. It didn't have engine grounding, so 2007 E38 was going bad.

    I ordered a replacement PCM from Rockauto, but for 2009 model year. Then I had...
  25. Well, it seems that the problem may be related to...

    Well, it seems that the problem may be related to the 4WD with the donor car.

    Do I have to do SPS programming for T42 with 2WD VIN to get this thing shift correctly?
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