I have a 07 5.3 procharged with meth all else stock, my question is are my 35" mickeys on r20 eating around 65-85 hp to the tire. my tune was 500hpengine at 8lbs but only 360@tire.

 

Yea... that's a lot of rotating mass for that motor to spin

 

Thats A LOT of rotating mass you have to try and spin. What gears are you running?

 

I'd bet you are knocking on 90 lbs per wheel/tire... I think stock 20's on my ss were 70 lb ea...

 

yea about 90-100 lbs so lets say a high number of 450lbs , I think that pretty safe to say. Now with that said on 8psi, meth and the rest stock it tuned 360 to the tires! 3.73 stock gears my turner says if I put 16" rims and ran a tall tire to make up for the 3" lift, I should be around 425 to the rubber! what do you think?

 

I say those 3.73s and 35" tires are whats killing you. Either go to 4.10s+ for drop down the tire size.

 

I don't know about that much gain but I'd bet you'll pick up 50 or so.

 

I'd go 4.56's at least, for 35's.

 

I agree 4.56 at least