Recommendations for R888 Pressures for Autocross
07-19-2015, 07:57 PM
#1
Melting Slicks
Thread Starter
Recommendations for R888 Pressures for Autocross
I have been using R888 tires for several years.
I like the "compromise"... I can drive them to the race site, race, then drive them home.
We have spent over 8 years doing the trailer, change wheels and tires thing. No more, thanks.
My experience has been with my C6... 285/30/18 front and 305/30/19 rear.
I used to start cold with 38 and 33 (f/r).
Then I'd check during the day to make sure they were still somewhere near this.
Now, with my C7, I have new rubber... 295/30/19, 315/30/20.
I used the same pressures yesterday.... not anywhere near the grip I expected.
Now, these new tires were not heat-cycled, so I expect it will take a
few events to get them to be as sticky as they should be.
But, I'd also like to get some opinions from others who run R888s.
What sizes and pressures do you run ?
I like the "compromise"... I can drive them to the race site, race, then drive them home.
We have spent over 8 years doing the trailer, change wheels and tires thing. No more, thanks.
My experience has been with my C6... 285/30/18 front and 305/30/19 rear.
I used to start cold with 38 and 33 (f/r).
Then I'd check during the day to make sure they were still somewhere near this.
Now, with my C7, I have new rubber... 295/30/19, 315/30/20.
I used the same pressures yesterday.... not anywhere near the grip I expected.
Now, these new tires were not heat-cycled, so I expect it will take a
few events to get them to be as sticky as they should be.
But, I'd also like to get some opinions from others who run R888s.
What sizes and pressures do you run ?
07-19-2015, 09:09 PM
#2
Burning Brakes
I don't autocross but I run my 888's at 32/33 hot for a road course. I typically start at about 27/28 cold and bleed them down to the desired pressures. I notice that anything above 34 gets greasy for me.
No need to heat cycle these tires and if you are driving them daily, they are already heat cycled.
I use 295/335 or 315/335 in 18's.
No need to heat cycle these tires and if you are driving them daily, they are already heat cycled.
I use 295/335 or 315/335 in 18's.
07-19-2015, 11:18 PM
#3
I have been using R888 tires for several years.
I like the "compromise"... I can drive them to the race site, race, then drive them home.
We have spent over 8 years doing the trailer, change wheels and tires thing. No more, thanks.
My experience has been with my C6... 285/30/18 front and 305/30/19 rear.
I used to start cold with 38 and 33 (f/r).
Then I'd check during the day to make sure they were still somewhere near this.
Now, with my C7, I have new rubber... 295/30/19, 315/30/20.
I used the same pressures yesterday.... not anywhere near the grip I expected.
Now, these new tires were not heat-cycled, so I expect it will take a
few events to get them to be as sticky as they should be.
But, I'd also like to get some opinions from others who run R888s.
What sizes and pressures do you run ?
I like the "compromise"... I can drive them to the race site, race, then drive them home.
We have spent over 8 years doing the trailer, change wheels and tires thing. No more, thanks.
My experience has been with my C6... 285/30/18 front and 305/30/19 rear.
I used to start cold with 38 and 33 (f/r).
Then I'd check during the day to make sure they were still somewhere near this.
Now, with my C7, I have new rubber... 295/30/19, 315/30/20.
I used the same pressures yesterday.... not anywhere near the grip I expected.
Now, these new tires were not heat-cycled, so I expect it will take a
few events to get them to be as sticky as they should be.
But, I'd also like to get some opinions from others who run R888s.
What sizes and pressures do you run ?
07-19-2015, 11:54 PM
#4
I don't autocross but I run my 888's at 32/33 hot for a road course. I typically start at about 27/28 cold and bleed them down to the desired pressures. I notice that anything above 34 gets greasy for me.
No need to heat cycle these tires and if you are driving them daily, they are already heat cycled.
I use 295/335 or 315/335 in 18's.
No need to heat cycle these tires and if you are driving them daily, they are already heat cycled.
I use 295/335 or 315/335 in 18's.
07-20-2015, 01:27 AM
#6
Melting Slicks
Thread Starter
AliZ51,
I have 19x10 and 20x11 wheels.
It is lowered on the stock bolts.
I have neg 1.8 camber on front, neg 1.3 on rear.
This Saturday was the first chance to actually drive the car to an event, and race it.
I noticed that there was rubber on the fender lips when we got to the race site.
Obviously there was some rubbing when driving on the Highway.
But it did not damage the fender lips, nor did it damage the tires.
During the race, we each got 7 runs in. There was no rubbing at all during the race.
I have a few pictures of the car on the track.
There is an obvious gap between the fender lips and the tires,
so the rubbing I did experience was from driving on the highway,
going over dips, and uneven, dug-up pavement.
I am going to raise the car back up on the stock bolts this week, for next Saturday's race.
Now, back to my question..... recommended tire pressures for R888 tires for autocross.
I have 19x10 and 20x11 wheels.
It is lowered on the stock bolts.
I have neg 1.8 camber on front, neg 1.3 on rear.
This Saturday was the first chance to actually drive the car to an event, and race it.
I noticed that there was rubber on the fender lips when we got to the race site.
Obviously there was some rubbing when driving on the Highway.
But it did not damage the fender lips, nor did it damage the tires.
During the race, we each got 7 runs in. There was no rubbing at all during the race.
I have a few pictures of the car on the track.
There is an obvious gap between the fender lips and the tires,
so the rubbing I did experience was from driving on the highway,
going over dips, and uneven, dug-up pavement.
I am going to raise the car back up on the stock bolts this week, for next Saturday's race.
Now, back to my question..... recommended tire pressures for R888 tires for autocross.