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Thread: Cold air kit

  1. #1

    Default Cold air kit

    Santa brought a cold air intake kit for my truck, an 03 GMC 2500HD w/ 8.1 gas & Allison trans. What can I expect for performance improvement and difficulties on installation. How about noise too--is it too much? The 8.1 has all the power I need for the RV but would like the mileage to improve some. Thanks all

  2. #2
    Sr. Apprentice BigRobSA's Avatar
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    Default

    You'll probably need to re-tune the computer for maximum effect both in extra ponies and extra mileage. I know a lot of times (not 8.1L specific) a good tune and CAI will net you 1-2 MPG.

    Heck, on my TBSS, after installing the built trans and converter, I retuned it and got 19-20 highway. But, now, after a LOT more stuff, I eeek out 15. :-(
    2003 Black Silverado LT extracab (tow vehicle): stock
    2007 Silverstone TrailBlazer SS:
    Eagle H-beam Forged Rods,Wiseco Forged pistons/rings,Kooks 1 3/4" & catted 3" Y,ATTITUDE Cam,NGK TR6 spark plugs,Scott's Wires,Melling 10296,Yank 3600,RPM Built Lvl VI ,VMS CAI,HSRK,ADM E-fans,160 Tstat,PCMforless Tune,Resonator delete,QTP e-cutout,Kbees and air bag drop,R1 Concepts Rotors,G2 Red painted calipers,Redline hood struts.Also,on the way ProchargerD1SC:glasses:

  3. #3
    Jr. Engineer Jacqson's Avatar
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    Default

    Quote Originally Posted by BigRobSA View Post
    You'll probably need to re-tune the computer for maximum effect both in extra ponies and extra mileage.-(
    Agreed, you probably won't notice any change because the MAF is calibrated to allow so much airflow into the engine and changing to a CAI isn't going to change the amount of airflow calibration of the MAF. Only a tune will do that.
    2011 Chevy Silverado 3500HD, Dmax/Allison, Taupe Gray Metallic, Line-x over the Rail & Rockers, S&B Intake, Banks Monster Exhaust, Rigid Dually D2's, Cognito Leveling Kit, Cognito Steering Braces plus much more.

    "Suburban" There is no Substitute.:great:

    SOLD - My Loaded up 02 2500 Suburban.

  4. #4

    Default

    Thanks guys. Great info. Does that tune have to be done at a dealer only?

  5. #5
    Sr. Apprentice BigRobSA's Avatar
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    No. Dealers don't tune. You'll have to find either a mail-order tuner that can send you a set of tuned computers and you'll have to send yours back OR get a handheld tuner that can change your truck's tune OR get HP Tuners and either tune it yourself ( not recommended unless you know what you're doing) or have a tuner send you a tune via email to be input via HP Tuners.
    2003 Black Silverado LT extracab (tow vehicle): stock
    2007 Silverstone TrailBlazer SS:
    Eagle H-beam Forged Rods,Wiseco Forged pistons/rings,Kooks 1 3/4" & catted 3" Y,ATTITUDE Cam,NGK TR6 spark plugs,Scott's Wires,Melling 10296,Yank 3600,RPM Built Lvl VI ,VMS CAI,HSRK,ADM E-fans,160 Tstat,PCMforless Tune,Resonator delete,QTP e-cutout,Kbees and air bag drop,R1 Concepts Rotors,G2 Red painted calipers,Redline hood struts.Also,on the way ProchargerD1SC:glasses:

  6. #6
    Jr. Engineer Jacqson's Avatar
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    Quote Originally Posted by Bluewater View Post
    Thanks guys. Great info. Does that tune have to be done at a dealer only?
    Check this out. He did the tune on my rig and I was very impressed.

    http://westers_garage.eidnet.org/
    2011 Chevy Silverado 3500HD, Dmax/Allison, Taupe Gray Metallic, Line-x over the Rail & Rockers, S&B Intake, Banks Monster Exhaust, Rigid Dually D2's, Cognito Leveling Kit, Cognito Steering Braces plus much more.

    "Suburban" There is no Substitute.:great:

    SOLD - My Loaded up 02 2500 Suburban.

  7. #7
    Sr. Apprentice Mr Dragon's Avatar
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    Default Tune

    Keep in mind that you may get MAF failure indictaor with some CAIs. The CAI model should have some recommended tunes on their website. I would consult with them as well.

  8. #8

    Default MAF stuck

    Thanks for all the great info guys. I really appreciate that. Once it warms up a little I'll try to install the kit again. I tried it a week ago but it was so cold the MAF was stuck tight in the airbox. Maybe the warm will help. If it ever get warm again--help Florida.

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