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Old 12-07-2005, 06:22 PM   #23
Scooby Guru
Member#: 25243
Join Date: Sep 2002
Chapter/Region: SCIC
Location: South Pasadena, CA
2006 Legacy Outback


During an EVO Dial-In course ... we did timed runs on a Skid Pad. I tried my single adjustable Tein Flex's with 550/550 springs at Full Stiff all around, Full Soft all around, Full Stiff in front, soft in back, Full Soft in front, stiff in back ... to see those effects. Then narrowed the settings down so that I got my fastest times.

I then tried different air pressures using a pyrometer to get tire temperatures that were about 10 degrees warmer on the inside. Adding more air caused the center of the tire to heat up, less created more temperature on the outsides. It was very cut and dry. The problem with using a pyro after the car comes in off of a regular course ... is that the inside of the inside front tire gets dragged across the corners, if you have a decent amount of camber ... artificially giving one an elevated inside edge tire temperature.

I'm very consistent in these type of tests ... doing three lap runs within a tenth of a second of each other. Also got that type of consistency in the EVO 1 "run-off." Timing gear broke during Evo 2. :-(

Ideally it would have been good to have gone back to playing with the struts on the skid pad ... but there wasn't time for that.

The "ideal" strut settings on the skid pad resulted in wild oversteer on the transitional handling course. I had to soften the rear end rebound to control that. Also soften the rear sway bar one notch.

But optimal set-up is very course dependent. If we have a course with few transitional elements I need to loosen the car up, ... lots of slaloms and I soften the rear end ... using rebound, sway bar, rear camber, toe and/or tire pressure.
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