Randy V

The King has spoken - all hail the wisdom of the King!

RolexNJ

333pg333

Hey Rob did you speak to Chris re that white car with the wide steel guards? I'd be curious as how difficult this was to do and what sort of $$$ we're talking. I'm guessing it's not cheap. You would probably need to do a major re-spray too wouldn't you think?

RolexNJ

No I haven't. Why don't you PM and ask him, since I know you are asking about rims/tires and now bodywork too?

333pg333

Ok I'll ask him. I think it sounds like the '89 could get 305's in there with a little work. This is what I'm aiming for. I'll run the engine in on the 285's and see what it's like. One of the best things about my suspension is the way it puts down the power. It is very hard to get wheelspin unless you try for it. I could probably put 295's on my rims now or get them widened or get new ones. I'll see.

Porschefile

If you want some traction, throw some ~275 or 285 BFG g-force t/a drag radials on! Those things grip hard for being (barely) street legal. Handling sucks though. I'd vote for some Kumho MX's or Falken Rt615's. MPSC's, judging by what I've experienced of them, seem to be very picky about operating in a specific temperature range. For the street, IMO the MPSC's are overkill for the price. Those things really deserve track usage more than just the occasional spirited drive on the street. Otherwise, just go all out and run some Hoosier R6's on your daily, but make sure to do some warm up laps around the neighborhood before leaving.

RolexNJ

IMO, he's not even making anything close to 450 RWHP let alone 500 RWHP now. Both and Special Tool and I blew thru 275s (air temps 70+) like it was a total joke, so 285s for the street won't do much. These are facts and not Pixy Dust fiction too.

DivineE

Thanks for advice Rolex CCW were very quick to respond and say they are happy to fit 18x10's on the rear without worrying about which tire to fit (which is good) Whats the max tire width I could fit on a 10" wide rim? 295?? and what profile would I need / could I fit with 18" wheels? I would like to go at least one profile over the norm to extend my gear ratio's a little... if it will fit without scrubbing under HARD abuse!

Ben

pole position

A 295 needs a 11 inch wheel to work correctly. Porsche coincidently shares the same thought. 285 is ideal for 10 inch.

Poor traction has a lot to do with the outdated (by todays standard) 951 rear suspension or using old technology (Bilstein Cup) as a upgrade. Shock science has come a long way and todays upper end suspension manufacturers are able to run almost insane spring rates with almost stock ride comfort.

333pg333

Exactly. My KW's are case in point. They're fine for street and great on track. Technology catches up to everything, no exceptions.
I know you guys aren't that keen on Toyo's but they're way superior to the MPSC's for my usage. No contest. As Travis said they (Mich.) seem to be temperamental and take too long to get up to temp. The Toyo R888's aren't in the U.S. yet, but I bet when they do land they will quickly gain momentum as a priority choice for racers.

RolexNJ

Anyone that is making some serious power is "hopefully" not using out dated suspension. This would be a given in 2007. If they know what they are doing, or if their engine builder does, then they will be designing a complete suspension approach to accomodate the projected BHP, the car's usage type, and the driver's style too. But back to tire size, 275/285s on a car making 450 RWHP+, let alone anything really big, will have traction issues with "street" tires - I didn't mention slicks, for that's a whole other world. I personally know of 4 people with issues with those sizes too. And you can only dial in/out so much "on the fly" with the compression and rebound. If a car has an optimally designed (spring rates, valving, etc.) it will help without a doubt. But most people aren't making 450 RWHP+ on here, and still have tire issues now. Nothing substitues the size of the contact patch to the surface. Under the assumption that the suspension is "optimally" configured, then "size does mean everything!"

Ben: You are welcome, glad to help anytime my friend. As I said, contact CCW for "exact" wheel fitment measurements and specs that are just for "your" car. I would trust a company like them or Fikse with their proven expertise.

333pg333

Yup, that all makes sense. Bigger is better (up to a point of course) but 305's would be a nice way to go.

Diver944

Still shooting to be the first UK 951 over 200mph then Ben

I can't wait to see it

RolexNJ

Wow, this is a shoot-out now? Well, both of you better have the right size tires on and compounds too! Good luck to both of you guys!!

Diver944

Don't worry I have no plans to get near the double ton, my engine won't be revving as high as Bens and I have enough rims with track tyres on that are already slightly lower in profile. I don't want to be buying a high profile set too