guys , some advice . i purchased 2 lightweight 17 inch rims that are 8inch wide for rear. Can i fit a 275/40/ hoosier on them for drags . i currently put a 245/40 hoosier , grip is great on take off but dont seem to get better 400m times and lower exit speeds .
Any advice here or some explanation to my problem .
i am new to the drag scene so really will appreciate the advice .
thanks

Your rolling diameter of the 245/40 is smaller than 275/40.

So your trap speed will be lower.

Wheel spin makes the track longer so trap speed is higher. Since you are hooking up now, your trap speed is lower.

You should have a 245/45, in that case you can put a 275/40 on that wheel as long as it will fit the car. The catch is that with the 275 you can't go to lower air pressures or the tire will cup.

How does spinning make the track longer if your not moving??

275/40 will dead hook with good prep at 18psi, factory stall converter.

Great questions

thanks guys , will try the 275 tyres .
My car is very strong on dyno comparitivaly to the other cars here but just dont seem to be in he top times . what would you guys expect on 1/4 miles times if the car does 340kw on the wheels with 520nm torque . i am currently only managing 12.8 and 185km/hr speed . i guess i am doing lots wrong .
what would you guys expect times on this power .
i only have software and exhaust currently.

thanks

anybody running with 275 on a 8j rim

Smart ***

What mods to the car?

dodger 63 ,i have software tuned and exhaust , that it .
any suggestions , what more i can do without affecting warranty.
the wheels on the 17 inch are about 18 pounds so i dont know if this about the weight you guys are running with those great times .
thanks

thats real light.. are you getting wheel in tire slip?

Because trap speed is calculated.

Saying it will dead hook is a very broad statement, track conditions play a HUGE role in that.

couldnt really figure if that was the problem , it hooked up well but maybe it was too light thus no weight on rear to propel forward .

what offsets are you rear wheels?

Chaulk them next time see if they spin. Hosiers are real soft and dont bead well...