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Thread: 36lb or stock LS1 injectors? HC is high...

  1. #1
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    Unhappy 36lb or stock LS1 injectors? HC is high...

    Hi guys;

    I've installed 36lb Bosch injectors to my car, and on the emissions it is horrible.

    The HC level is around 2000ppm!

    I have a cam (223/227@114 LC 0.592” lift use a valve spring with a lift of 0.600’) and full headers + high flow cat and no catalyzer.

    I've used the ASA 2000/2002 corvette injector sizings and also tried some other resources, and even tried a stock tune with idle parameters, and cannot seem to get around it.

    Is it really big for an LS1 5.7 with above additions to it?

    should I use the stock injector sizing? would the stock duty cycle will be high or not?

    any inputs are appreciated...

    Thanks
    Evren

  2. #2
    Lifetime Member mr.prick's Avatar
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    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

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  3. #3
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    yep. but no luck... :(

    I bought them from here: http://www.speedinc.com/cont.cfm?cid=C0000845

  4. #4
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    to be more precise:

    the stock I had was: Bosch 0280155931

    current 36lb: Bosch 0280155811

  5. #5
    Lifetime Member mr.prick's Avatar
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    I believe the 0280155811 is similar to the 0280155868
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  6. #6
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    interestingly it is 0280155868 (as on the injectors that I've removed today) and I've tested with the old stock, the values are the same... looks like something is wrong other than my injectors or settings...

    Friend of mine has exactly the same setup (headers, not cats, 36lb, cam etc...) and can pass the HC tests...

    so I'm thinking either Fuel Pressure Regulator? or MAF (not sure if having a maf sensor will really correct the huge gap.)

    the nominal HC level is 800 PPM and mine is around 2000ppm :(

    any ideas guys?

  7. #7
    Joe (Moderator) joecar's Avatar
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    Do you have any logs showing front O2 sensor voltages (HO2Sx1)...?

  8. #8
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    here is the log attached. showing O2 are switching fine at idle.

    tune wise I'm on CL tune and I've a similar tune with a friend of mine, and he has no prb. only diff we have is the MAF sensor, which I don't have for the moment.

    And I don't think MAF will make that much of difference in HC emissions reading, I mean the gap of emissions values are almost double or triple so something other than this can be wrong.

    thanks to all again...!
    Attached Files Attached Files

  9. #9
    Joe (Moderator) joecar's Avatar
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    The log shows that it's trimming (regardless of injectors or MAF)... so I don't see the cause.

    Does your friend have cats...?

    Quote Originally Posted by evren
    ... full headers + high flow cat and no catalyzer.
    ...
    You have hiflow cats but their catalyst has long since been "worn" off...?

  10. #10
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    he doesn't have cats and I don't. he had a similar tune to mine, and no MAF either.

    I'm also suspicious of something different that might cause, is the fuel regulator.

    I've installed the Walbro 255 sometime back, but I recon that it was the high pressure version. maybe that is causing fuel regulator not to control excessive fuel at idle? since what ever I've changed on the tune, AFR, timing, stock tables, VE, didn't made much sense.

    so I just bought a fuel pressure regulator with the gauge on it, so will try and see the exact pressure and adjust it if needed.

    other than this I cannot assume any other problems... if you have any other advices pls share.

    thanks for the help.

    Evren

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