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Thread: LT Headers

  1. #1
    Lifetime Member Beer99C5's Avatar
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    Smile LT Headers

    The wife has approved the LT Header upgrade
    After I bolt the LT's on, just redo the VE Tables? The MAF table should not change or will it? Is there a ballpark % to increase the VE for a new starting point?
    1999 C5 A-4 Convertible
    1 of 245 Nassua Blue 99 Vert's, Blackwing, LS6 Intake, 42 # Injectors, Two Stage Nitrous System- Dry and a Wet Plate, EFI Live Scan/Tune V2, 1999 PCM with 2002 COS 5 OS Custom Nitrous Panel.


    Maine USA



  2. #2
    Lifetime Member Doc's Avatar
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    Just out of curiosity if you have the chance and patience before you rescale things....if you are still runing LTFTs it would be interesting to see what they think of the LTs now wouldn't it?

    That is the question though, is a set of LT's enough to rescale VE and MAF? At this point I would say yes, as you already are taking the high road by investing in EFI Live and a wideband. Unfortuneatly most folks have already done the LTs prior to getting a tuning solution. Keep us posted with your results.

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.eifalchemy.com
    www.greatamericancarwar.com

  3. #3

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    Who's LT's are you going to use?

    We install a ton of Kooks headers with great results. I have also noticed that on a stocker the LTFT's end up being between -8 to -12 % at idle and just off idle and a bit less as rpms pick up.

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

  4. #4
    Lifetime Member Doc's Avatar
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    Ah Howard,
    Just in time with real world results, should have known. Here's to ya in the New Year...To you and yours, Harrison

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.eifalchemy.com
    www.greatamericancarwar.com

  5. #5
    Lifetime Member Doc's Avatar
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    Wow, no more driving tonight for me...Two smilie beer toasts in a row!

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.eifalchemy.com
    www.greatamericancarwar.com

  6. #6
    Lifetime Member SSpdDmon's Avatar
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    Top end - VE and MAF should change. I'd expect a 3~4% increase in fuel needed for the MAF. VE might be a little different.

  7. #7

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    I have also found that stone stockers, untuned, usually yield AFRS of 11.5-11.9 at WOT. The headers tend to "use" some of that fuel and will report AFR's between 12.1-12.4.

    MAF and VE will both have to be altered a bit.

    Nice buzz Harrison!

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

  8. #8
    Lifetime Member Beer99C5's Avatar
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    Quote Originally Posted by Redline Motorsports
    Who's LT's are you going to use?

    We install a ton of Kooks headers with great results. I have also noticed that on a stocker the LTFT's end up being between -8 to -12 % at idle and just off idle and a bit less as rpms pick up.

    Howard
    Was leaning towards American Racing Headers, but if the the Vette Docs don't get back to me, I am willing to go Kooks. Looking for LT, Hi flow Cats and X pipe. Vette Docs said they would weld in the WB Bung no cost.

    Tommorrow I am jacking up the car and taking the stock exhaust off, Switching my Fuel Pressure Logging From AD1 to the EGR PID as TAQuick wrote up, and trying to set up the valet switch. Then while waiting for the Headers, mess with the COS5 for the Nitrous tables.
    1999 C5 A-4 Convertible
    1 of 245 Nassua Blue 99 Vert's, Blackwing, LS6 Intake, 42 # Injectors, Two Stage Nitrous System- Dry and a Wet Plate, EFI Live Scan/Tune V2, 1999 PCM with 2002 COS 5 OS Custom Nitrous Panel.


    Maine USA



  9. #9
    EFILive Distributor dfe1's Avatar
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    Quote Originally Posted by Beer99C5
    Was leaning towards American Racing Headers, but if the the Vette Docs don't get back to me, I am willing to go Kooks. Looking for LT, Hi flow Cats and X pipe. Vette Docs said they would weld in the WB Bung no cost.
    Take a look at Melrose long tubes-- They're coated and supplied with Random Tech metal cats and stainless X-pipe. The set-up was good for 37 at the wheels on my 01 six-speed. Installation is easy and fit is great. (www.melroseheaders.com)
    DigitalEFI- EFILive US Distributor
    sales@digitalefi.com
    678/344-1590

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