Another epic weekend at Buttonwillow Raceway!
I installed a brake proportioning adapter from aaron88
on Friday before heading to the track, and dialed in some more rear brake bias. HOLY $#!&
! Adding some more rear brake bias transformed
the car. Three major things happened: 1) The front brakes no longer overheat after a few hot laps, because they aren't working as hard now that the rears do something. 2) Overall braking is SIGNIFICANTLY increased. I had trouble locking up the brakes. It just stopped harder and harder and harder. Braking was very progressive. 3) I can now brake hard enough without locking up that the brake pedal is finally down to the height of the gas pedal.... which means heel-toeing is finally possible. Fanastic!
I also installed adjustable upper control arms used them to get -3 camber and +10 caster up front. Front tire wear is pretty damn good now. Not much mid-corner understeer, though there still is a bit. The car is stable enough with my tire package and alignment settings to drop the throttle a bit and get the nose to tuck in, but I'd rather be able to stay in it and have the car rotate some. I'm going to work on swaybars next -- I'm still not running a rear bar but it seems that now the time is right.
I spent Saturday getting up to speed and working on corners, but on Sunday I kept running into a tire temperature wall when I tried to push it for more than a lap. The track surface was just too hot around mid-day to really set a fast lap time. I also backed out a bit too due obvious signs of excessive oil temperature -- blowing oil smoke exiting the Off Ramp (slow, very tight banked right hander) and lots of lifter tap. Even the guys on race tires were losing a second or two versus their morning times, probably due to overheating their tires.
I pulled into the paddock after a cooldown lap and measured my oil pan temp with an IR gun -- 250 degrees F. Yikes. That means probably at least 280*F when I'm pushing it in the middle of the day. I plan to install an oil cooler before the next hot track weekend.
Almost everyone went home before the final session of the day, but they missed out big time... a cool breeze picked up and the track temperature dropped to match the air temp.
I set a new personal best on Buttonwillow's #13 clockwise configuration: 2:09.9. Hell ya!
Also, the lead instructor for HPDE 3 followed me around a bit on Sunday and said I'm ready to move up to HPDE4. Just a stone's throw away from Time Trials now! I'm going to start seriously assessing my car against the competition rules to see if it's possible to be competitive in any class.
[This message has been edited by Steven Snyder (edited 04-09-2014).]