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01-09-2012, 04:48 PM
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#1 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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2003 GMC Crew cab
I was wondering if some one know the best way to wake up a factory 8.1L motor as in simple upgrades. I heard the computer or mas sensor hold engine back because it has to much power.
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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01-09-2012, 06:57 PM
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#2 |
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Registered User
Join Date: Nov 2008
Location: manly iowa
Posts: 390
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Re: 2003 GMC Crew cab
they have torque management programmed into the pcm to retard the timing when you get on it to protect and extend the life of the transmission. Otherwise they make so much torque it will eventually toast the tranny. You can have it programmed out but be prepared to improve the trans, or be replacing it.
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01-09-2012, 11:38 PM
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motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: 2003 GMC Crew cab
Nice truck!
www.blackbearperformance.com for a custom ecm tune - do your bolt on mods first, then get the tune. headers, 2.5" duals is a good start, maybe a K&N FIPK. That's pretty much what I do to all my vehicles to wake them up.
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac   Use the SEARCH function on this forum - it is your friend!! |
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01-10-2012, 09:15 AM
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#4 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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Re: 2003 GMC Crew cab
Speaking of duals i had to go with a dual in and out magnaflow muffler as i kept breaking mufflers. They would over heat and crack. 1st one was a turbo muffler dual in and factory single out , 2nd was flowmaster dual in and factory single out and now on 3rd one dual in and dual out with 3" pipes go just over rear axle. They only last 9 months. The magnaflow now is definatley discolored a reddish purpleish color. I tow a 35 ft campring trailer with a golf cart in the bed, with all other cargo about 10k lbs. The truck checks out OK on the computer but i think it is running lean, but only gets 8 mpg? Any advise will be appriciated.
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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01-17-2012, 08:23 PM
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#5 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
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Re: 2003 GMC Crew cab
bumb
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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01-17-2012, 09:29 PM
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 2003 GMC Crew cab
Quote:
Quote:
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01-18-2012, 09:42 PM
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#7 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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Re: 2003 GMC Crew cab
thank you for the info.... will after market converters work?
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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01-21-2012, 10:29 PM
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 2003 GMC Crew cab
Quote:
You can remove the cats all together & have the catalyst monitors turned OFF with a custom PCM tune, No check engine light, Will pass emissions as long as they dont do a visual on the converters. Its against "federal" law to do this. |
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01-21-2012, 10:56 PM
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#9 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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Re: 2003 GMC Crew cab
factory stuff is long gone.... plus i like to hear the rumble of the exhaust.
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