Thoughts on the first Autocross

First Autocross Picture
Well as promised here are some thoughts on yesterday's autocross.

First and foremost, I had a blast and the car ran like a champ. Are there issues? Sure, some things need to be sorted, and that's what yesterday was all about.

1) The brakes need to be sorted. The pads had NO bite. Current pads are suspected to be in the wrong heat range. It wasn't getting any better with each run so it's not so much a question of bedding them in as just using the wrong pads. I'm going to try another set of pads more autocross specific and see how they work. Pads I'm using are for a much heavier car so we'll see. I'm also going to bleed the brakes again to be 100% sure there isn't any air trapped in the system.

2) The backend was stepping out a little too easily, it was a little loose. Thoughts as this point, mostly lack of heat in the tires. The ambient temp was around 17C, the course was pretty straight and fast which didn't help get heat in the tires. I'm also playing with tire pressures. This is more difficult, previous cars I've had have been heavier ~2700lbs, FrankenMini is 1400lbs. I can't just ask someone what pressures they use. I started at 36 PSI and in discussions with Paul from Breadbox Racing I dropped it down to 26 PSI. Since I wasn't pushing the car it's hard to tell how much of a difference it made.

Aside from above the car worked well. My times were right near the bottom of the timesheets, which was expected. I was around 6-7 seconds off the pace. That said I was being VERY kind to the car, shifting at 5500 RPM a far cry from my 7200 RPM red line. I'm going to change the rev limiter down to 7000 and make a point of bouncing off of it next time out.

Saturday I'll be going over the car, changing the pads, bleeding the brakes and generally giving it the once over ahead of the next event on the 26th. I won't be changing anything with the suspension until then. I'll see how I do then...

paulmon - clock 22:11:09 - Sunday, 06.05.07 - competition - 783x - pencil permalink
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