F1TwoThousand

Aiming for 600whp set up with following mods to help in traction:
1. Taller rear tire from stock 245/40/17 to 245/45/17.
this will effectively give longer gears and not over power tires in low gears.
2. Increase rpm- have ap2 would like a 9k redline so i can hold a gear longer and put down power consistently.
Car is used on street for highway pulls/red light racing(im very naughty lol)
all this will basically help in putting down so much power more consistently and not have to shift as much during racing

Any thoughts? Anyone follow this philosophy? Is there a better way? Big fan of sleeper car look so keeping oem wheels.

any charts of ap2 passing 8.5k rpms? Would like to know where stock head on ap2 starts running out of breath.

Charper732

How about a r200 or ford 8.8 rear end with different gearing since you'll be exploding that stock diff anyway...

I too am a fan of the stock wheels. Weldcraft is in cali, they widen wheels. I have sent my rears there to be widened so I can run 285s

MARK AUS S2K

Wholey shit mate, you are widening the AP1 or AP2 wheels?

I have always wanted to widen my AP1 wheels but the tyre range is shitty. I might just keep my AP1's and rock a rear set of 255/50/16 Mickey Thomposon Street/Drag radial with a semi slick looking tread.

F1TwoThousand

The whole point is stay with stock diff. I dont want any whine as its a dd. So only way for longer gearing is taller tire. And taller tire will make diff and tranny see less torque... Charper ive been thinking of widening stock ap2 wheels to really use up that 255/40/17 sport cup 2 tire. But im thinking 2454/40/17 will be perfect with stock ap2 rim.

Charper732

good luck. Im guessing you are way below the 600 mark at the moment. Im on 255s and have no traction at 500hp.

F1TwoThousand

Just thinking out loud i dont claim to know anything lol. But theoretically if you want more acceleration and braking grip you want a taller tire. If you want more cornering grip wider tire is reccomended. Thats why im puzzled why most dont go to a 245/45/17 instead of 255/40/17. 245/17 on ap2 rim is already too wide because my rear tires are bubbled out from the rim if that makes sense the sides dont even make much contact with the road as the tire is widder than the rim(running pilot super sports). Currently on 300whp with greddy/e85 and your right traction issues already but i dont mind not having 1st amd 2nd gear traction i like highway highspeed pulls

F1TwoThousand

But 255 and 265 look amazing not going to lie id rather get that just for looks but that would require widening stock wheels and ive read thats not reccommended? Charper do you mind saying how much it was to widen the wheels and a quick review? This is the first time ive heard of s2000 oem wheels being widened i know musclecars do it all the time imports not so much

AllMotorAP2

You will need the following: puddymod/8.8/R200 diff with a taller FD and a set of drag radials and at 600whp with the stock trans plan on using boost by speed/gear in the first two gears and ramp it up in 3rd. If that all seems to work your clutch will be the next to spin if you aren't running a twin disk. More boost more problems.

AP1Chief

s2000Junky

I never heard of anyone widening wheels in this forum until I did it back in 2009-10 to my set of RPF1. I know one or two guys have done it since. It works well and its not that expensive when you consider the cost of similar width wheels, while almost always being heavier multi piece as well. You need to start out with the right width/offset to have enough inner fender room so keep that in mind with what ever wheel you are deciding to widen and by how much. If you want added strait line traction it true that taller is helpful, but width is as well. I took a leap and decided to give it a try and I have no regrets. chalked up 10's of thousands of hard miles on my set.

I see little point in going tall and skinny, but rather get as much tire surface on the ground as possible, and might as well yield some added lateral grip as well. It is an S2000 after all. A 275/40 makes much more sense to me then running a 245/45. Overall diameter is roughly the same. I run a 315/35/17 out back. But its primarily set up for lateral grip/road and track. But again its the same overall diameter as what your looking at. For strait line you dont want rear camber either, so a upper camber joint or upper adjustable control arm to get more positive camber would be helpful. Run lower tire pressure and get a little bulge/squat out the tire is beneficial, however you will sacrifice handing. Id say with anything under 600-650whp you don't need to compromise much in handling on this car for the sake of strait line, but rather utilize proper rim to tire widths, compound choice, gearing and boost by gear.