Tire Width/Compound Vs. Horsepower
 

I plan on forced induction after I get all my suspension bits dialed in. My goal for forced induction will be in the 400ish hp range (Who knows, still figuring out how much power I really 'need'). For argument's sake, my question is how much tire should I have and what is the ideal compound for a tire within the 400 power range. And to add to that question, what kind of suspension configurations should I run? I realize that question is very broad and vague, but I just want to understand what I should do to have a properly dialed in car with forced induction. I plan on doing track events, and I want to avoid being squirrelly upon straight line and corner acceleration. I understand that throttle modulation can help immensely, but I would like to know ideal set-ups or tire configurations that you guys are already using or would recommend. Perhaps this thread can shed some light for people that plan on going forced induction and are curious as to what suspension they should run.

So many ways to answer this. My best answer would be to have two sets of wheels and tires. One set for the track in the form of some 18x9 inch wheels and a set of 265-275 width R compounds (I race on Toyos, so that would be an RA1 or R888). Then for the street I would run another set of wheels in a size you like with a set of at least 245 width Michelin Pilot Super Sports in the rear (the best all around tire money can buy with 30,000 mile warranty).

I'll take a stab at this...

I was actually looking at some racing tires earlier this morning. Advan A048's reaaaally expensive ($320+/tire) but they look like they will stick to walls. I've read that the general widest with you can run is 265/35/18 prob 275's too (rear). I have heard of 285's being shoved under there but that would definitely require fender rolling and pulling at the cost of extra grip. As for the front, I would guess a modest 245 would do well (someone with more experience than I can chime in). I'm not sure about staggered setups for the track, if you can, I'd assume a 255 upfront and a 285 in back.

(huge tires, such grip, many turning, wow)-Dodge

I have no clue about suspension. While mostly based on personal preference, I've noted some people like a bit softer spring rates in the rear for the suspension travel to deal with the much more added hp to the rear wheels, and stiffer up front.

By no means am I a tire/suspension guru.
Better to get someone like @CSG Mike to answer those questions.

Why not stick to 17" wheels for the track? Maybe something in a 255/40/17? They will be lighter and cheaper than 18" options...

Serious question: what about un-sprung weight?

you can fit 285s in the rear on stock ride height without rolling the fenders

We have huge wheel wells...but considering an aftermarket suspension, would it still be possible?

here is how tight it is

https://scontent-b-atl.xx.fbcdn.net/...98413882_n.jpg


285/40/18 nitto nto5r

When I think of R compounds I just think of 18" as that is where most of the options reside. There wouldn't be anything wrong with going with a 17", but I would stick to a square setup as the designers intended and to allow the tires to be rotated for better wear.

......shit:confused0068:

I'll take a stab at it, but I need you to more clearly define your goals.

1. How much are you willing to spend to do ALL of this, including FI, supporting mods, suspension, rims, brakes, and tires? Do you want a dyno queen or a reliable track monster? If you're not thinking something well in the 5 figure range, I'd urge you to reconsider your goals.

2. What experience do you have? Do you know how to do your own basic diagnostics, dial your suspension in, etc? What about driving experience?

3. No level of tire will ever hold 400hp if you do something stupid. For example, even a stock car will break traction on slicks, if you crank the steering wheel in 1st gear, and floor it. What level of traction do you realistically want?

4. Describe for me EVERYTHING you will be doing with the car.

5. You're in NorCal. DO you plan on running Laguna Seca? They have some nasty noise restrictions that will really define what you can do with your setup to make power.`

i didn't do any of that, just bought cheap tires. sliding is more fun anyway. if i ever decide to get fancy i'll throw some 245 pilot sports on there, maybe get a second set of wheels and some really sticky ones if i ever decide to take it to the track.

i guess it really depends on what you plan to use the car for.

Run stock tyres

I plan on doing r888s 225/45/17 on the stock rear rim until i can get a decent suspension/ wheel setup