you also mention stronger rims....what do you mean? have you changed the size of tires/rims? For example, in my GT, I dumped the factory tires/rims. I bought 17 x 9" American 5 spoke black rims and went to a lower profile/wider tire-run BFG AS in 275/45 x17. These tires are an 1" less in diamter than stock.
Had to recalibrate the ECM for accurate speedo....of greater importance though is the effect the shorter tires have on other areas.
For example, this combo takes my stock 3:55 axle ratio to a effective, calculated 3:76 ratio. Really helps on the acceleration aspect of things! on flat ground I normally make 2nd gear starts
Another benefit is in braking. The smaller diameter combo increases brake torque, thus increasing braking effectiveness.
These are items you can definitely feel and contribute to better acceleration and braking.
Conversely if the tire/rim combo you run increases tire diameter 1", the effect is exactly the opposite. Depnding on the combo, you may see the effective, corrected axle ratio drop to 3:21 and less effective braking due to decreased brake torque/force.
These are mathmatical facts you gotta consider if tire diameter is changed from stock....for me personally I like the benefits of the shorter combo and barely affects fuel economy....
There is no such thing as to much horespower..!!
Last edited by TWShovel; 08-25-2012 at 02:45 PM.