Yeah, you need re-tune. Just like you would ANY electronically controlled auto.
Yeah, you need re-tune. Just like you would ANY electronically controlled auto.
2006 SilveradoLittle Black Bitch
Def retune on my spares I shift at 6400 no fun compared to 6800...
yup it will redline
wow, this sucks..
2006 extended cab, 6.0 swap, full bolt ons SOLD
2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI, muffler delete, black bear tune 14.0 @ 98 on the 33'sSOLD
2007 TBSS AWD, cam, stall, built trans, N2OSOLD
2006 RCSB cammed LQ9, full exhaust, 3200 stall, 2-4 drop
Originally Posted by farmtruc
49 Ford F1
355 chevy / turbo 350 / 12 bolt posi / camaro subframed
Why does this happen? Are shift points set up by rpm?
99 GMC - RCSB 408 w/98mm whistle...WSLS Racing...
The truck must reach two requirements for the tranny to shift. One is MPH, the second is RPM. Now, you can zero out either table there and go strictly off the other, but in this case, it doesn't matter. If you put smaller tires on, the truck is going to think it's at a higher RPM than it is, because the tires revolve faster sending more VSS pulses. The truck needs to have tire size changed in the tune to correct for these pulses. If not, it'll short shift. Rob had a few problems with this at SAR last year because his slicks were so much shorter. He was shifting 500 RPM early.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
Weird since it is not meeting the rpm requirements... Wonder if it has to do with the speed limiter moved to calibration from GM
99 GMC - RCSB 408 w/98mm whistle...
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