Running R-Compounds (R888) for the first time
07-14-2009, 10:48 AM
#16
I never really experienced the "no noise then let go" thing with R-comps. They talked a lot at the limit. Not as much as street tires, but more than a true slick. And I never had one just let go (other than a blow out). It is always a progressive release. And even over the limit the tires still have some grip as they don't drop off to zero instantly. It's usually just enough grip to save your backside.
-td
-td
38 hot all around worked best for me with the R888, or even 36/38 too, wasn't sure which I preferred more!
07-14-2009, 11:23 AM
#17
Moderator
Rennlist Member
Rennlist Member
I posted some reactions to R888 in previous posts of mine - if you search on my ID, you should find them.
I heard they wanted to be scrubbed in, so I ran them on the street for about 400 miles (100 around here, 300 on the way to Watkins Glen). I heard they didn't need to be Heat Cycled, and I found the opposite. Day 1 they were terrible in many ways. Day 2 they were hugely better. Biggest problem was getting the pressures right. In the end, I spiked them 17 PSI driver's rear down to about 14 PSI passenger front if my memory serves me. So, Cold 22 went to Hot 39. That's a huge change in pressure... Anything over 39 lost it, so was really trying to stick with the 35-38 range with about 1 PSI lower in the front.
Weather was dry, so I swapped left to right to even out the wear. Note that this may not be advised because the tires are directional, but I figured that was for the wet. Anyone know for sure? They ran fine swapped on an 80 degree day.
I heard they wanted to be scrubbed in, so I ran them on the street for about 400 miles (100 around here, 300 on the way to Watkins Glen). I heard they didn't need to be Heat Cycled, and I found the opposite. Day 1 they were terrible in many ways. Day 2 they were hugely better. Biggest problem was getting the pressures right. In the end, I spiked them 17 PSI driver's rear down to about 14 PSI passenger front if my memory serves me. So, Cold 22 went to Hot 39. That's a huge change in pressure... Anything over 39 lost it, so was really trying to stick with the 35-38 range with about 1 PSI lower in the front.
Weather was dry, so I swapped left to right to even out the wear. Note that this may not be advised because the tires are directional, but I figured that was for the wet. Anyone know for sure? They ran fine swapped on an 80 degree day.
