since i went from the factory 15's to my 17s, wouldnt my speedometer be off??? how much would it be off roughly, and in what direction. if it says 60 how fast am i really going?

also since then it seems i dont have the low end power i had? i used to lay on it around 2k in first and spin them all of first, now i just get a little chirp and even when i shift from 1 to 2, i notice in second i donthave pull until i get up in my revs, just seems different should it be?

 

you overall size shouldnt change unless you bought a different size. its called plus sizing you go up in rim but down in side wall. but overall height stays the same. you could be noticing the weight difference

 

it could be the weight difference, well i went up in rim size and down in sidewall yes, overall my rears are about half inch higher than stock, and 1.25 inches wider. fronts are about .5 inch higher and .5 inch wider

 

what size tires on the 17's

 

255/45 on rears, 235/50 on front

 

Go to the highway witha stop watch. go past a mile marker and start the stop watch. Now if you get to the next mile marker before you're stop watch hits 60 seconds then you're going that much faster. 1 mile in 58seconds means you're going 62mph.

 

Link below has some calculations that may be helpful....


http://www.4lo.com/4LoCalc.htm