Okay now I have a serious chassis and tire Question.

[parsonsj]

Originally Posted by Greg

The part I laugh at the most is the size of the brakes on STREET CARS... because if the car doesn't have ABS -- then the most braking the car can do is whatever the TIRE / Contact patch is capable of. 6 piston Brembos - locked up are probably every bit as good as a single piston PBR.... if they're locked up and you're skidding it doesn't matter how "big" they are.

That's not quite true. Bigger rotors give you more leverage to stop the car, without as much clamping force. It means that at near threshold braking the brakes are easier to control as the tire nears its loss of traction threshold. Another plus of bigger rotors is that the additional mass of the rotor itself can dissipate heat and help reduce fade -- not important on the street where a panic stop per year is too much. But on the track, every turn is a quasi-panic stop, and heat dissipation is vital.

Another way of looking at it is this: if locking the brakes was the goal... we'd still be using drum brakes, which can lock up a tire very easily.

[camcojb]

Originally Posted by parsonsj

Another way of looking at it is this: if locking the brakes was the goal... we'd still be using drum brakes, which can lock up a tire very easily.

yeah, the first time you hit them........ Good info and I know what you're getting at. Just reminded me of a few times in my first drum braked cars where the second or third time trying to stop fast the car barely slowed down and I had to get "creative" to avoid hitting something.

[GregWeld]

Originally Posted by parsonsj

Another plus of bigger rotors is that the additional mass of the rotor itself can dissipate heat and help reduce fade -- not important on the street where a panic stop per year is too much.

Pretty sure I pointed that out in my post.

[Vince@Meanstreets]

Miate's are cool.... http://www.rightthisminute.com/story...rsche-corvette big tires get it done in this case but HP didn't hurt either.

[parsonsj]

Originally Posted by Greg

I pointed that out in my post.

Yessir, you certainly did. We agree on that!

[syborg tt]

The reason I started this post is I was talking with a Race Car Chassis builder. Most of the cars he build are for long tracks not short tracks like autocross at Good Guys Events.

Long story short he is building of all things an s10 pick for a gentleman that has a 250,000 porsche race car. The tire size he is putting on the truck is 275 front and 295 rear. Engine is a 383, forgot to look at the trans. He is confident that with the suspension set up and scratch built chassis it will handle every bit as good as the owners Porsche race car if not better.

They are building it for fun to beat other high end cars. Nothing like getting spanked by a little S10 pick up. When I asked him why not go bigger he kinda laughed and said ,"Son bigger isn't alway better"

By the time he was done explaining everything to me it made more sense. I figure since all this guy does is actually build track cars he must know what he's talking about. I remember a VW van that was built with the same philosphy and it surely didn't have big tires

https://www.youtube.com/watch?v=0MLCuaPdPew

[Vince@Meanstreets]

Originally Posted by syborg tt

The reason I started this post is I was talking with a Race Car Chassis builder. Most of the cars he build are for long tracks not short tracks like autocross at Good Guys Events.

Long story short he is building of all things an s10 pick for a gentleman that has a 250,000 porsche race car. The tire size he is putting on the truck is 275 front and 295 rear. Engine is a 383, forgot to look at the trans. He is confident that with the suspension set up and scratch built chassis it will handle every bit as good as the owners Porsche race car if not better.

They are building it for fun to beat other high end cars. Nothing like getting spanked by a little S10 pick up. When I asked him why not go bigger he kinda laughed and said ,"Son bigger isn't alway better"

By the time he was done explaining everything to me it made more sense. I figure since all this guy does is actually build track cars he must know what he's talking about. I remember a VW van that was built with the same philosphy and it surely didn't have big tires

https://www.youtube.com/watch?v=0MLCuaPdPew

of course, purpose build and factored into design a smaller tire is fine. 275/295 isn't really considered small either. its all about balance.

[syborg tt]

Originally Posted by Vince@MSperfab

of course, purpose build and factored into design a smaller tire is fine. 275/295 isn't really considered small either. its all about balance.

Hi Vince,

I agree but there are some purpose built cars on this site and the others that I lurk on and they are all going bigger is better.

btw - Don't tell Kenny I am thinking about building a road race s10. He might kill me.