I recently made the post, "loss of power and gas mileage." When i first noticed the loss of power was about the time i put my new rims on, they are 17" with 215 45 17 tires. So they are about 3/4ths of an inch taller then stock tires, and the rim and tire together way about 15-20 pounds more then the stock tire and wheel. Well yesterday i put my stock rims and tires back on for the upcoming winter and i've driven it about 100 miles and it has all its snap back, i havnt been able to check the milieage, but it gets up and goes like it should. Could it be that the extra tire heighth and weight is what caused such a noticeable amount of power loss?

 

This is very interesting....20 pounds of difference and loss of power? I dont know if that would be a correct assumption I could be wrong though......


Mike

 

Yes. Extra rotational mass and extra friction from. Both will hurt mileage. Plus if the overall height is bigger than stock, the odometer will say you travelled less miles than you actually did.

 

The taller tire would also change your final drive ratio to effectively a taller gear ratio, thus making the off line performance more sluggish. The taller gear ratio should actually help with the gas mileage but the added weight could be offsetting any gain made by the gear change.

 

any weight added to your drive train will have a much greater affect on your wheel horse power.

 

Yes it could be, as stated b4 larger rotational force and the gas mileage isn't as bad because your actually going further than what you mileage shows.