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Thread: 2007 COS 2 Bar Turbo Truck

  1. #1
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    Default 2007 COS 2 Bar Turbo Truck

    Guys wanted to see if anybody has the answer for this.

    2007 Silverado 408 TURBO.

    OS 12597120

    There is obviously no COS I can use on the truck OR is there. Can it be swapped out to somehting else.

    We really need to 2 bar this truck so we can get some Fuel Transisition going.

    Can I run a 2 bar sensor and cut the MAP table along with the VE in half basically making 100KPA only 50KPA. So that at 100KPA I would have 200KPA for real???

    Has anybody ever tried this?

  2. #2
    Lifetime Member GMPX's Avatar
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    That is how it used to be done before any 2bar solution existed. I know out here in Australia it worked ok, well, better than as it is, but this was also on cable throttle cars, I don't know how it would go on an ETC car.
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
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    I tuned with the modified map scaling on a turbo 8.1 running 14lbs. The resolution and mid throttle transitioning left a lot to be desired. The computer for whatever reason would only run open loop with the 2004 cos for that pcm. Hence the return to stock os and modified map. I then went to a 2005 8.1 os and went cos5 with no issues. If possible I'd suggest trying a 05-06 os and using th available cos for that earlier os. Is this an ls1 pcmb, or an e38/67?
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
    2001 GMC RCSB pt88/5.3/4l80e/14 bolt 11.34@123.2 best pass so far with a 1,82 60' @ 13lbs boost

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    Its probably an LS1B 1MB PCM because E38s can do 2.5Bar on factory OSs.

    Good point though, I dont know what platform changes occurred between 05 and 07, but there are a few COSs for 05 trucks...
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  5. #5
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    Guys its 07 classic style truck

    Originally came with a 4.8 L

    The 0S just does not match up with anything.

  6. #6
    Lifetime Member Chevy366's Avatar
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    Quote Originally Posted by Evilz28nos View Post
    Guys its 07 classic style truck

    Originally came with a 4.8 L

    The 0S just does not match up with anything.
    Tune repository has it as a ; 2007 Express Van Auto 6.0L (LQ4) LS1B 776k, http://www.tunefiledepot.com/index.p...Type=P&Stock=Y
    2005 1500 HD , Custom OS3 SD tune .
    2006 Trailblazer
    Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .

  7. #7
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    Quote Originally Posted by Evilz28nos View Post
    Guys its 07 classic style truck

    Originally came with a 4.8 L

    The 0S just does not match up with anything.
    Have you thought about reverting to a slightly older os which offers COS functions? The only thing that sucks is the copy paste functions of all the tables.
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
    2001 GMC RCSB pt88/5.3/4l80e/14 bolt 11.34@123.2 best pass so far with a 1,82 60' @ 13lbs boost

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    bump any more info on doing this?

  9. #9
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    Quote Originally Posted by tirefryin_s10 View Post
    bump any more info on doing this?
    i think you might have to go with a 05 gas pedal and tac module, then flash a 2005 COS

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