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Thread: turbo build issues

  1. #1

    turbo build issues

    Folks, new turbo build is having issues. It is acting like it is blowing out the spark, but we have regapped the plugs and still have the issue

    What it does, it as soon as it hits 9lbs of boost, the car starts cutting out. It seems like we can run boost into any rpm range and any throttle position until we hit 9 lbs, which often occurs near 4000 rpm when we try to log/tune

    The car is a 2006 gto

    stock 6.0 bottom with a 232/232 blower cam
    78mm turbo
    83 lb injectors with an external pump and return system with a boost reference regulator. At idle it is right around 60 psi

    the plugs are tr6 plugs gapped to .028

    I think we are either blowing out the spark, or there is a weak ground that is causing the car to act up

    However, I wanted to attach my tune and see if you guys see something I might be missing

    This has been scaled for the injectors, and is in olsd mode since we are in the middle of tuning.

    I unfortunately somehow do not have my logs, but when the cut out occurs, the a/f is generally around 11:1 and 14 degress of timing with no knock retard. So plenty of fuel and not a ton of spark. Also, no cel's to help point to anything

    Thanks for any help

  2. #2
    Senior Tuner DSteck's Avatar
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    Get a log up as soon as you can. Include your O2 sensor voltage in the log. I had a turbo LS1 that was breaking up under boost. Wideband showed good, but when watching the narrowbands, you could see the driver's side flicker around. The engine had a blown headgasket that was pushing coolant into one cylinder only in boost.

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  3. #3
    Ok i will try and log it again tomorrow and make sure to include that. Since i havent been using narrow bands for tuning I didn't have them in my logs

    You happen to glance at the tune and see anything obvious i may be missing?

    Thanks

  4. #4
    Senior Tuner DSteck's Avatar
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    I will try to look today. I'm usually on my phone using the forum.

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  5. #5
    Senior Tuner edcmat-l1's Avatar
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    First off, WTF is with the VE tables? Holy chit man, fix that crap.

    Second, set turn the P0068 code back on. with the test diabled, you shouldn't need to shut off the code. Besides, shutting off the code will not keep it from going into REP, all it will do is keep the code from setting when it does.

    Third, if it's blowing out the spark, it will pop and spit and backfire, etc. It won't just feel like it's shutting the blade or cutting off.

    Post a data log of it doing it.

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  6. #6
    Senior Tuner mowton's Avatar
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    Strange VE Boost table.. could use some cleanup. Appears in the 9lb (app 165 KpA) boost area and 4K rpm'sh, the tune would step to like 2,000 when your "tuned values" seem to be in the 800/900 region up to that wall?

    Make sure you do not have excessive backpressure in exhaust system, thought that would appear as a "plateau" effect rather than a breakup. Looking forward to the logs.

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  7. #7
    Ed, assuming you mean the boost VE table? That was my attempt to guesstimate what I would need in those cells. The primary VE table is the result of a tuner previous. Same with the p0068 item you noticed, so I will change that.

    What you describe is exactly what it is doing, it will be pulling great, then starts breaking up, popping etc, let of gas and it goes right back to normal until you hit the same point

    motown, I see what you are pointing out. Those arent really tuned values though, as we can't get clean pulls into those cells. I will try changing those and see if anything shakes out

  8. #8
    Senior Tuner edcmat-l1's Avatar
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    Drive around tuning your VE up to 105 Kpa. Then when you have that all straight, copy your 105 Kpa column into your boost VE 105 Kpa column. Then copy it into the 255 Kpa column, mulitply the 255 column by 1.5 then interpolate between horizontal bounds. That will give you something realistic to work with.

    I WOULD HIGHLY RECOMMEND you get the VE correct up to 105 Kpa before you attempt to tune the boost VE. By the look of the boost VE you could easily run it wat too lean and hurt it.

    Edit: You need to put the VE table back to stock and start over.
    Last edited by edcmat-l1; 12-11-2011 at 01:37 PM.

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  9. #9
    Advanced Tuner gn2beatu's Avatar
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    You may be experiencing boost leakage. When it hits 9psi, it may be leaking past a clamp/hose. Check all your connections to make sure they are tight. Remove every coupler and inspect for a tear or what looks like a bubble.
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  10. #10
    Senior Tuner edcmat-l1's Avatar
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    Quote Originally Posted by gn2beatu View Post
    You may be experiencing boost leakage. When it hits 9psi, it may be leaking past a clamp/hose. Check all your connections to make sure they are tight. Remove every coupler and inspect for a tear or what looks like a bubble.
    Boost leak is not going to make it pop and spit.

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  11. #11
    You thinking the ve table is making it pop and cut out Ed? We are also double checking grounds. Something we noticed when starting the car all of the interior lights flicker on and off while cranking.

  12. #12
    Senior Tuner edcmat-l1's Avatar
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    Quote Originally Posted by camarochevy1970 View Post
    You thinking the ve table is making it pop and cut out Ed? We are also double checking grounds. Something we noticed when starting the car all of the interior lights flicker on and off while cranking.
    I aleady talked to Jeff about it. He's gonna run a negative cable from the battery to the engine. That will probably fix it.

    You need to follow my directions on the VE tuning. If you end up in one of those ditches in the boost VE table, you could end up very lean and hurt the motor.

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  13. #13
    Sounds good. Will let you know how it progresses

  14. #14
    any update on this, im having the same problem with a TT lQ9 th350 fmvb