Jackass w/ LS9: original build and new Jackass 2.0 updates!

[syborg tt]

Morning Mark,

This is more of a curiosity question. How long do your tires last when you are tracking them ?

[GregWeld]

It's so easy to improve stuff that Charlie has owned. LOL


Good to hear it's going the way you wanted it too.... but we know you'd get it handled!

[Stielow]

Originally Posted by syborg tt

Morning Mark,

This is more of a curiosity question. How long do your tires last when you are tracking them ?

The new Rival S seem to be good for about ten 15 - 20 minutes test sessions with me driving. I would think I will get two events out of a set of tires now that I can run full 20 minute tests without temp issues. If you are not going 10/10th I would think a set of tires should last you 4 - 5 events depending on the HP and mass of your car. I have junked a set of tires in a day in the past though. I tested some Michelin Super Sports and tore chunks out of them.

On a side note the new Rival S tires are WAY better than the old ones. With the current tires wars going on I would plan on new tires every year anyway.

A 2014 Z2/8 can wear out a set of tires in 80 minutes of track time going flat out. (Two tank fulls of fuel) A new Z06 will wear out the tires in 30 minutes and they are the best on the first two laps. (One tank full of fuel).

If you want to play you are going to need to pay....

Mark

[syborg tt]

Originally Posted by Stielow

The new Rival S seem to be good for about ten 15 - 20 minutes test sessions with me driving. I would think I will get two events out of a set of tires now that I can run full 20 minute tests without temp issues. If you are not going 10/10th I would think a set of tires should last you 4 - 5 events depending on the HP and mass of your car. I have junked a set of tires in a day in the past though. I tested some Michelin Super Sports and tore chunks out of them.

On a side note the new Rival S tires are WAY better than the old ones. With the current tires wars going on I would plan on new tires every year anyway.

A 2014 Z2/8 can wear out a set of tires in 80 minutes of track time going flat out. (Two tank fulls of fuel) A new Z06 will wear out the tires in 30 minutes and they are the best on the first two laps. (One tank full of fuel).

If you want to play you are going to need to pay....

Mark

Wow, that is incredible and thank you for the quick reply.

[Sieg]

Talk about great body language!!!

[RussMurco]

Originally Posted by Stielow

I think I have my new computer wallpaper!

Originally Posted by Stielow

I tested some Michelin Super Sports and tore chunks out of them.

I guess my boss has never pushed his Ferrari 599 anywhere near the limits when he goes to the Elkhart Lake Ferrari every summer. That car is roughly 3700lbs with 600+ horsepower so I'm wondering if it would chunk the tires at 9 or 10/10ths too.

Originally Posted by Stielow

A 2014 Z/28 can wear out a set of tires in 80 minutes of track time going flat out. (Two tank fulls of fuel) A new Z06 will wear out the tires in 30 minutes and they are the best on the first two laps. (One tank full of fuel).

Do you think the Rival S tires would improve those numbers, Mark?

Originally Posted by Stielow

If you want to play you are going to need to pay....
Mark

Indeed!!!

Originally Posted by Stielow

Off the data trace the car is cornering at 1.15 G and braking at 1.3 G so once I get the chassis dialed in we should be doing better.

This makes me wonder, what kind of numbers did Hellfire generate once it was dialed-in?

[CarlC]

Great numbers on the thermals. Heat management on a 1000hp bullet becomes a serious system-wide challenge.

[Stielow]

Originally Posted by RussMurco

I think I have my new computer wallpaper!


I guess my boss has never pushed his Ferrari 599 anywhere near the limits when he goes to the Elkhart Lake Ferrari every summer. That car is roughly 3700lbs with 600+ horsepower so I'm wondering if it would chunk the tires at 9 or 10/10ths too.


Do you think the Rival S tires would improve those numbers, Mark?


Indeed!!!


This makes me wonder, what kind of numbers did Hellfire generate once it was dialed-in?

Tires and tire wear is a tricky subject. First off not all Michelin Super Sports are the same. All of the OE tires are tuned to the car. The 345 I chunked on Hellfire was due to tire over temps due to 100 MPH tire spin. I'm sure Ferrari works with Michelin to tune a specific tire. The Michelin tires on the C7 Corvette are very unique from the off the shelf tires.

On your bosses car, there is big difference batween 9/10 and 10/10 on tire wear and car temps.

Right now on Rival S tires I would say JA 2.0 is faster than Hellfire on the old Rivals. Actually I have data from Waterford that it is. I will know when I get to Gingerman. Most of my data is from Gingerman so it will be a better comparison. On a high lever JA 2.0is 125 lbs heavier than HF. JA 2.0 is up 20 HP over Hellfire so that is a wash. The Rival S is much better than the Rivals so it should be fun to see the lap times.


The graph below show the Rivals (in Red) from OUSCI last year on a 85 degree day on Hellfire. The Blue data is the Rival S on JA 2.0 on Gingerman on a 60 degree day.

The X axis is Lateral Acceleration and the Y axis is Long Acceleration (Friction Circle)



The data is kind of interesting that you can clearly see the max Lat numbers on the Rival S are up about 0.08 to 0.10 G in LH and RH turns. Because it was cold and Waterford is small the acceleration and Decel delta does not show up.

I know once I get the Rival S on a bigger track where I can get some heat in them they will really work well.

Mark

[dontlifttoshift]

What will be on the front for Gingerman?

[Stielow]

Originally Posted by dontlifttoshift

What will be on the front for Gingerman?

I Rival S on all 4 corners.

Mark