Jet performance reflash info

[Ldub]

For example, my oversize tires (275/65R18) run about 5 MPH above my actual speedometer reading. So if the posted speed limit sign says 60 MPH, then I just put my speedometer needle on 55 MPH with no worries.

Uhhhhhh...

Math don't work that way Riff...

It's all about the %.

example: a .07% difference in tire size = these speedometer values...

55 = .07x55=3.85, so 55=58.85

60 = .07x60=4.20, so 60=64.2

65 = .07x65=4.55, so 65=69.55

and so on...

[Triathlete]

IIRC in the past those who have looked into chips/tuners found thet our engines perform pretty close to their limits and the price of the tuners was not worth the little gains that could be achieved...of course this was on a non-modded engine. As far as just getting your speedo correct...there are several devices that recalebrate speedo or you might check with your local speed/tuner shop. I know there are a few in my are that recalebrate speedo's.

[LittleBeast]

Haha, well I had to disassemble my gauges and needles to install intelli-glow needles, so last time I had the needles off, I had someone with a stock car drive 65mph next to me with cruise on and I matched their speed with cruise on and then I replaced the needle at 65 mph and then I had them speed up to 70 and then down to 60 and stayed with them and checked to make sure my speedo was close and done.

I know it is not a perfect fix, but it is nice to know that at around 60-70 mph the speedo reads true :-)