Just change it in the tune.
Just change it in the tune.
2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s
2004 Buell XB12s
Originally Posted by LamboDoNoMo
Forgot to mention. NOT a option. I plan to put the 20s back on the SS when I get home. I do not have the rights for hpt for the SS. I am not spending 100 bucks to change the speedo for 4 days. If it comes down to that Ill just eat the money for 4 new tires
Last edited by Show&Go; 02-14-2010 at 04:57 PM.
06 Intimidator SS- Tuned, CAI -DD
03 Silverado- Last incarnation 13.6... RIP
Ls1, Pnp heads, Polluter camshaft, spray, 4k stall on the way
"Seize the day like you seize your noodle" - Shin Chan
From what i have seen when i go up 2 inchs on my past trucks the mph was off by about 3-4 at 70 so my gage would say 70 and i would be going 74ish.
So i would say if you are going down in size that it would be about the same but the speedo would say 70 and you would be going 66. But i maybe wrong with gearing and all. If you can just get a gps and check it that would be the best way.
07 GMC ccsb 1500 4x4, front replacment bumper, 285 70 r17 on 17" black helo max 6, Dual flowmasters dumped.
If its only off by 5 or so I can deal with that. Im just iffy about if I had it close to off by 10 or more
06 Intimidator SS- Tuned, CAI -DD
03 Silverado- Last incarnation 13.6... RIP
Ls1, Pnp heads, Polluter camshaft, spray, 4k stall on the way
"Seize the day like you seize your noodle" - Shin Chan
dont worry about it, just drive it. Get a GPS unit that shows your MPH and live with it, thats what I do since mine is off by about 4 MPH at 70. I correct the speed and I get a antilock brake code so I just put it back to stock and compensate for it.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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