Quote:
Originally Posted by Takumi788
Great question.
Over the weekend I participated in both a track day and an autocross with brand new RE71Rs. Previously, I have been on a set of maxxis rc1s for the past 35+ track events. With the RE71Rs installed, I found myself stiffening the suspension quite a bit more than usual to get the car to behave as I like.
When I got to the point to where the car felt right I noticed I would loose grip (rather violently) mid-corner on flat corners. The only thing I can think to compare the violent loss of grip to would be like trying to slide a piece of tape across a table. It grips for a little bit, then abruptly lets go. But then it grips again, until it lets go.
It was minimal at the track but at autocross it seemed to be more of an issue. I talked to my teams engineer and he suggested that I continue stiffening the rear, run a stiffer spring rate or swap the sway bars. So I figured I would try the sway bars first because they are still stock.
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Just how brand new were they? Zero heat cycles, zero street miles, literally put on with the stickers still on the tread?
What I'm saying is that the bridgestones are not their very best on the first heat cycle, or two. Plus you have a nearly non-existent data set to base your decisions off of. That place is gonna be weeping things to the surface for the rest of the year. Add in some mold release that may or not still be there, and I say change nothing except maybe tire pressures, and re-roll. Bet you get significantly different results.
If it's still pendulum-ing into snap slides, then start cranking up rear rebound.
You are also describing sort of the situation that makes me choose to do the pedal dance instead of just the 5-second method. Inside rear up>diff says wtf>brakes unloaded wheel>moves all that to the outside>outside wheel spins and slides >bind up relieved>inside rear back down and snatches hard. either a spine-wrenching wiggle, or a snap spin.