I heard of people dynoing less horsepower with bigger wheels???

Is this true???

I've got a set of 4 Simmons 17x9.5 FR-Series (three-piece) Wheels and I'm going to order BFGoodrich G-Force KDW tires, 285/40/17s in the back and 275/40/17s up front.

How much dynoing hp will I lose???

 

The only difference would be weight...you may lose 2-3hp at the most...your stock Z28 wheel size is 245/50/16...the same as 275/40/17...the rotation will be the same...but like I said..weight will be the factor

 

I "think" that for every 10 pounds of rotating weight you lose the same 1/4 time as with 100 pounds of regular weight.I am not 100% sure on this but I think that's the way it goes.

 

^^^What he said.

I remember reading a guys website where he widened his stock 17x9 wheels to 17x11s for the rear, with 315/35R17 tires. He lost 2-3 rwhp, and somethinglike 4ft/lbs of torque. Nothing really major.

 

Every 1lb of rotating mass is like adding 8lbs of dead weight to the car.

 

i lost 3 hp with my 17 by 11s

 

Seriously? That sucks a**!

 

ill justhave to increase the nitrous shot to make up the difference