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Topic Review (Newest First)
06-02-2008 08:44 PM
DirtyDeeds I'm glad we could help. Sounds like things are coming nicely. Enjoy the rest of the season!!!
06-02-2008 06:55 PM
Blurvfocus ^^ Ok then, so I figured I have to have 45 up front to keep the tires from rolling under, that's a given, and the back has to be equally hard to loosen it and neutralize the understeer. I went with 45 front, 43 back, and the shocks full soft front, half hard back. After 2 runs, it seemed really good. Later, for other reasons, I had an instructor drive the car (he litterly shook the change out of my pockets- wow!) The topic of the car never came up, we were concerned with tecnique, etc, but as he walked away, he said, "By the way, that thing is set up beautyfully." So- Problem over! Thanks to everybody for your help!
05-14-2008 03:52 PM
WD40 ^^^Good suggestion.

By all means, the fronts take about 80% of the abuse on an AutoCross course.
With that in mind, I rotate my AC tires each event to get more even wear.

As I mentioned earlier...
The sooner you burn through those NeoGens the sooner you'll get some better tires on there.
05-13-2008 08:57 PM
DirtyDeeds You should see at least a little evidence of tire scrub on the rears.

At your next event, talk to some of the more advance FWD drivers and see if one of them will take your car for a lap or two and give you some feedback on your setup (With you riding along of course). At the same time, you can see how your car behaves with a more experienced autocrosser at the wheel.

If you're not comfortable with someone else driving your car, get one of these guys to ride along with you and critique your driving.
05-13-2008 06:26 PM
Blurvfocus The rotation thing- for as much as the front tires are being ripped apart, the rears look pristine, with no evidence of even rolling under. These look like grandma's tires. That's not right, is it? If rotation is happening, then shouldn't I see at least a little evidence of it in the form of rear tire wear?
05-13-2008 11:59 AM
Schroeder02
Quote:
Originally Posted by Blurvfocus View Post
I've been tampering with the shock settings and seeing a drastic improvement. I set them hard in the back and soft in front (they were half-hard all the way around). So when I run next time I'll play around adjusting in small increments. In the meantime, you guys seem to be in substantial agreement on the pressures; I'll go with them.

Thanks for your help.

btw- I've got to travel for ??? long. So if there are any more thoughts, I'm not ignoring you, I'll respond as soon as I return.
I think your on the right track now I more spring and rebound in the rear will help with rotation. Also I would try running a higher tire pressure in the rear then the front this will also add some more rotation.

Wonder what the Koni spring rates are?
05-09-2008 05:38 PM
Dcl2049 Yeah I use that setup for my Konis, be careful though because I had the car coming around on me big time just with braking in a straight line.
05-08-2008 09:37 AM
Blurvfocus I've been tampering with the shock settings and seeing a drastic improvement. I set them hard in the back and soft in front (they were half-hard all the way around). So when I run next time I'll play around adjusting in small increments. In the meantime, you guys seem to be in substantial agreement on the pressures; I'll go with them.

Thanks for your help.

btw- I've got to travel for ??? long. So if there are any more thoughts, I'm not ignoring you, I'll respond as soon as I return.
05-07-2008 09:08 PM
Dcl2049 I liked my NeoGens better than the G-Force sports on the track. It may have something to do with the concrete I race on?

In any case, I would run right around 38 up front and around 36 in back. They did seem to get a little greasy but I'm not a "pro" auto-xer so I just sucked it up. I would generally run fastest on my middle laps.

Do the thing with the chalk. ^
When mine was set right it would rub it off all the way to the end of the outside tread grooves and a tad further.
05-07-2008 08:34 PM
DirtyDeeds For every tire used in autocross, there is a sweet spot as far as tire pressure. Too low and you lose grip, too high and you still lose grip. Tread compounds, patterns, camber and alignment aside, how much pressure you run has quite a bit to do with how soft or stiff the side walls are on your particular tires. Tires can also handle only so much heat before they become greasy and start losing grip.

45psi is probably a little high to start with. Try starting out with the front tire between 38 - 40 psi and put the rears between 34 - 32psi.

Pick up some chalk and mark the tires where the side wall meets the tread. By seeing which tires are rubbing away the chalk, you can make a more informed decision on adjusting your tire pressure.

Is the car getting slower after a few runs? If so, the tires may be getting hot and greasy. If you think this might be the case, go over to Home Depot and pick up a cheap hand pump garden sprayer. Fill it with water and spray your front tires after the 2nd or 3rd run to keep them cool.

Are you trail braking? This generally the fastest way to get a fwd car through a turn.

Is it possible that you may be over driving the car? I'm only asking this because it's a common mistake for a new autocross driver. I know I did it.

The NeoGen isn't the best tire, but that doesn't mean that we still can't make you faster.
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