2004SSS

iTrader: (25)

i got my car and the speedo appeared to be off. i thought it could have gears and after figuring out i most likely dont( i bought it used with a few mods) so when it was programmed for stock 3;43's the speedometer was anywhere from 10-15 mph offf, i now have it programmed for 4:10s and its close to beign right but not exact. any idesa on why it would read off besides gear or tire size?

sunsetta

iTrader: (3)

Maybe a faulty speed sensor.

2001NBMZ28

I'd play with the calculator at www.f-body.org/gears/

2004SSS

iTrader: (25)

well that says im supposed to be at 89 in 6th gear at 2000 rpms. it does not seem like im going that fast at all. does anyone car read this with the ls1 m6?

staringback05

iTrader: (8)

hook it up to efi live and re-adjust it

2004SSS

iTrader: (25)

i have hptuners but what do i readjust besides wheel size and gear ratio?

staringback05

iTrader: (8)

hmm not sure with that....ive never used hptuners, but i know when i did my 3.73s we just change those two things on efi live and it solved the problem

skifast87

Yup man i sure do. 89 90mph i turn 2grand flat in 6th

LS1_TA_2002

I have my HP Tuners up right now. Give me your tire size so I can calculate diameter. Gear ratio?

2004SSS

iTrader: (25)

see im not 100% sure on the gear ratio looks like im going to be pulling the rear cover to find out for sure. i reset it to 3:43's and sure enough i was at 2k at 89mph. but i know i wasnt going that fast . so it must have gears or somethign is definatly wrong.

i have stock sized tires on stock rims.

renxwar

Is this your first fbody? They're suspiciously smooth at higher speeds. I have to pay attention or I'll run down the highway at 90 in 6th.