360CH With Yok Slicks - Experience?

Anyone with first hand experience how Yok slicks like the 360ch?

Need to choose a tire before I finish designing the Ohlins suspension, and Yoks are what I am running on my BMW racecar, so thinking about also running them on this 360ch as I have some tire info.

One issue is the Yok's widest tire for the rear is a 280, and while the 280 is larger than an equivalent pirelli 280, I don't think its as big as the pirelli 295.

If anyone has run them, please post your opinion.

Only looking for FIRST HAND experience. I've run many Yoks, dunlops, Pirelli's, etc but not on a 360ch, not looking for general comments, just first hand experience

TIA!

 

Well, the S02 is on the harder of the mediums, would probably use them to get a bit more life out of them, and for the 280 /680/18 thats 2362, the 230/650/18 for the fronts would be N2077.

I love Yoks on BMW's, new racecar i'm building (e46) uses 280/650/18 on all four corners (front engine, don't need 680's in the rear).

Only thing i've heard from 230 on the front of the challenge is it might rub on a low right height, so i'll watch out for that.

Thanks for the info, I'll prob get some scrubs to test out different compounds before having the owner get stickers.

2008 will bring Pirelli Rolex Scrubs to the market, not sure how the ALMS scrubs for Yok/Michelin are doing right now, i'll have to contact my used tire guys.

Have a good holiday weekend!

 

Are you saying this as a general statement or do you have actual proof to show this to be true?

I'm an engineer, specifically was in motorsports, and Michelins are not always faster. Great tire, but not the end all solution.

Whats your personal experience with Michelins on 360Ch's?

If you have some data, i'd love to look at it.

As far as finding the right width, here is whats offered compared to the original Spec FC tires.

Front Pirelli: 235/645-18, Sec Width 9.65"
Front Michelin: 24/64/18, Sec Width of 9.92"

Rear Pirelli: 295/680-18, Sec Width of 11.61"
Rear Michelin: 27/65/18, Sec width of 11.25

Only problem is that rear Michelin side wall might be too small to carry the load, and the 27/68/18 has a Sec width of 12.48" which is too big. So unless its a GT chassis setup that can take the wider wheel/tire combo, Michelins are not a great fitment option.

I'm pretty sure Dunlops have a size that fits ok though, so we might pickup a set of Dunlop and Yok's and see how they run on a "universal" alignment, as I know dunlops have specific characteristics they like (many times its more camber for the fronts).

Yokohama has larger sec width than others with higher numerical values, so i've heard the fronts might rub at certain ride heights.

Unfortunately, I have not been able to get the hard data needed to finalize my suspension/damper specs, so I'll probably have to go purely off on track testing data.

I think I got all the info I can get now though, thanks.

Dunlop sizes are:
Front: 235/640R18, sec width of 9.8"
Rear: 285/680R18, sec width of 11.9"

Yok Sizes:
Front: 230/650-18, Sec Width 9.72"
Rear: 280/680-18, Sec Width 11.77"

 

They are all 280 in the rear, the rake and gearing is irrelevant.

Well, I would not go by what many of those pro teams use because they are under contract and develop the tire with the manufacturer. Many times a tire might be faster but they run whatever the owner says I wish this was a 360gt/430gt and those michelins would be great, but unfortunately this is just a fun car for someone, and I'm looking to make it easier to drive without going the route of Aero...i'd rather get the most mechanical grip first.

If you ran Dunlops at Rolex, it must have been a while ago, have you run any of the recent Dunlops?

I don't have much experience with rear engine application in GT car, just front engine rwd gt and mid engine formula cars, so thats why I was asking.

Michelin looks to be out of the question since the sizes just won't fit.

We'll try and dunlops and yoks and see which is better, I have a feeling the Yoks will be better though.

I'll just have to plug in some assumptions into the formula's to finish off the design on the Ohlins.

Thanks, I appreciate your info/input!

 

I worked with Ohlins USA actually, developed some stuff for BMW's, but I'm not with that company anymore, however I am still using Ohlins on various cars.

I wish Ohlins USA was as involved with Automotive as Ohlins Sweden, unfortunately their main concentration is Motorcycle/ATV/Snowmobile.

They do have some of the most advanced Formula and Sportscar (aka prototype style,formula cars with wheel covers basically) dampers on the market though, the TTX series. The software for valving them is so convenient, and revalving them physically is a very fast process. No need to carry multiple sets of dampers for a car, valving can be changed very quickly.

As far as the sidewall goes, its basically for banked tracks where the outside tire will get extremely loaded, and with a rear engine car, there is a lot of load going into that tires sidewall. Bigger sidewall, it can take moreload, simplest way to think about it really.

In a case like BMW's, you have considerably less load on the rear tire under the same circumstances since there is more weight up front (where the engine is). So you can run a 650 no problem.

 

Thanks for the input.

Looks like Pirelli's are the top choice right now. Keep it simple.

Looks like it would be tough to run the available Michelins sizes on the rear, so considering the Pirelli's are known to fit and work, that looks to be the way to go. I'll just use them as the basis to complete the Susp design.

Thanks again guys.

 

This car is not seeing that level of competition/use, unfortunately.

I'm mostly just swapping in Ohlins in place of the stock challenge shocks.

The car, as you said, is decent as is, so no need to fix something thats not broken. However, I do feel there is an advantage of Ohlins are used, as I am sure you'd agree.

My time is mostly being spent on the chassis/suspension design for my BMW, this 360 is for someone else.