Tires?
Thread Starter
Safety Car
Joined: Jul 2003
Posts: 3,501
Likes: 880
From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
Thanks everyone.
The tires will be the stock 275/40/17, and the rears are a 10.5 wide 18" wheel. So thats a 295/18? Not sure yet.
And the car i originally built to auto cross, but alot of street. Its got a built 383, built tranny, and all new suspension and bushings from VBP (RIP)
Only downside is the Dana 36 (i know, i know - when i kill it ill get a 44) Had 2.59, went to a 3.07. So this is why i dont want the tires to be TOO sticky.
No snow. And will do my absolute best to avoid the rain.
The tires will be the stock 275/40/17, and the rears are a 10.5 wide 18" wheel. So thats a 295/18? Not sure yet.
And the car i originally built to auto cross, but alot of street. Its got a built 383, built tranny, and all new suspension and bushings from VBP (RIP)
Only downside is the Dana 36 (i know, i know - when i kill it ill get a 44) Had 2.59, went to a 3.07. So this is why i dont want the tires to be TOO sticky.
No snow. And will do my absolute best to avoid the rain.
Le Mans Master
Joined: Aug 2015
Posts: 6,126
Likes: 2,002
From: St. Charles MO
And the car i originally built to auto cross, but alot of street. Its got a built 383, built tranny, and all new suspension and bushings from VBP (RIP)
Only downside is the Dana 36 (i know, i know - when i kill it ill get a 44) Had 2.59, went to a 3.07. So this is why i dont want the tires to be TOO sticky.
No snow. And will do my absolute best to avoid the rain.
Only downside is the Dana 36 (i know, i know - when i kill it ill get a 44) Had 2.59, went to a 3.07. So this is why i dont want the tires to be TOO sticky.
No snow. And will do my absolute best to avoid the rain.
If you want to autocross in a class that allows 200tw "max performance" tire, for example, than the best two that are currently legal are easily the BFG Rival S and the Bridgestone RE71R. Anything else is simply not competitive. However, there are no good 17" options in either tire. Next choices:
- Falken Azenis RT615K+, sizes 275/40/17 front and 315/30/18 rear: these are fast, but not as fast as the Rival or RE71R. OTOH, they last longer. They are competition oriented: an autocross tire that can be street driven. You could go down to a 275/35/18 in back, but it would be a lot more stretched than the 275s up front, and so the rear would have a little differently steering response. Go with the 315s in this combo.
- Continental ExtremeContact Sport, 275/4017 front and 295/35/18 in back: These are really fast street tires that can also be autocrossed (i.e. the opposite of the Falken, Rival S, and RE71R). As mentioned, they are awesome in the rain. And they are relatively cheap - always a bonus. On a typical autocross course, they are about a second slower than the Rival S or RE71R, and the Falken is in between.
- Michelin Pilot Sport PS2, 275/40/17 front and 315/30/18 rear: These are similar in description the Continentals, very fast street and rain tires. That rear size has some OE Porsche application, so I don't know what that means in terms of construction or compound differences compared to the front size. I think you'd go equally fast and get similar life out of the Michelin and Continental, but the Michelin is twice as expensive. So to me, the Conti is the best choice for a street tire that can be autocrossed.
Thread Starter
Safety Car
Joined: Jul 2003
Posts: 3,501
Likes: 880
From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
Thanks again. Alot to consider. Hope to get the new tires (and wheels) in a few weeks. All 4 tires still need aligned. Did it by measuring and its close for now. Still need to try to get the front higher though (VBP extreme spring)
Le Mans Master
Joined: Aug 2015
Posts: 6,126
Likes: 2,002
From: St. Charles MO
On the spring, the Xtreme should have jacking screws at the ends like on C5-7s. You can raise it by screwing those down more.
Thread Starter
Safety Car
Joined: Jul 2003
Posts: 3,501
Likes: 880
From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
I had another thread on this. But my screws are all the way down, flush with spring and its not enough for street i dont think. It pains me to think about it considering i have exactly 1 mile on the car, but i might get coilovers in the front at least. Plus the ride might be too harsh for street with the X spring. Dunno yet.
Le Mans Master
Joined: Aug 2015
Posts: 6,126
Likes: 2,002
From: St. Charles MO
I had another thread on this. But my screws are all the way down, flush with spring and its not enough for street i dont think. It pains me to think about it considering i have exactly 1 mile on the car, but i might get coilovers in the front at least. Plus the ride might be too harsh for street with the X spring. Dunno yet.
Advanced
Joined: Sep 2018
Posts: 72
Likes: 17
From: Georgia
I have the Contis on my car. Agree with what MatthewMiller has said, but I did notice that my tires started getting greasy toward the end of my sessions in 90° Texas heat, but that’s likely attributable to me overdriving the car than anything else. I’ve been satisfied, especially when it comes to price vs the Michelins.
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