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Old 05-31-2010, 06:18 PM   #1
Pat
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This weekend was my first time with the Boxster at the track.

The Boxster was bulletproof, which is a big relief with a new (to me) car. The only thing I can complain about it the understeer. I was shocked at how much there was, regardless of tire pressures. That took a bit of fun out of things, but it did encourage me to try trail braking. That didn't go over so well, though. =X Scared myself a couple times, but managed to keep in (mostly) on the track, and pointed (pretty much) in the right direction. My braking skills could use some work.
The car can only go up to one degree of camber without aftermarket parts. Hopefully I can figure out how to adjust that without screwing up the other alignment settings and make it faster for the next event at PPIR in a month.
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Old 05-31-2010, 07:08 PM   #2
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Here are your options to go more than 1 degree negative camber:
a) camber plates
b) GT3 control arms
c) lower the car with (stiffer) lowering springs, this changes the whole geometry of the front (and rear) axle so that you can get more negative camber. I did this and got -1.75 degree
d) you can also go balls out and install adjustable front and rear sway bars and now can dial in any kind of over and understeer

but wait, there's also e): go wider on the front tires (example from 205 to 225), this increases the patch area in the front and dials out some of the understeer
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Old 05-31-2010, 07:11 PM   #3
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Thanks, Chris. At this point I'd like to get as much out of the car as possible without buying parts. I just learned the camber is adjusted on the top of the shock tower. I'll check that out this week to see how much room is left to play with. I'd like to see plenty of room to spare, but am keeping my fingers crossed.
Thanks again.
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Old 05-31-2010, 08:24 PM   #4
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what tires and what sizes are you running by the way? and if possible what rim sizes
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Old 06-01-2010, 03:20 AM   #5
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The car should not be understeering like that... your best bet is to go and have it aligned by a shop that specializes in setting these cars up for the track. Better to spend a few hundred bucks and get it done right rather then waste a few track days with a car that isn't handling correctly.

The other thing to look at, and I say this with respect, is the driver. It is possible to induce understeer in these cars very easily if your transitions off the brake are not smooth... it might also be helpful to have an experienced driver take a lap or so to make sure it is the car that is causing the problems.
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Old 06-01-2010, 04:19 AM   #6
Pat
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Quote:
Originally Posted by mdex
The car should not be understeering like that... your best bet is to go and have it aligned by a shop that specializes in setting these cars up for the track. Better to spend a few hundred bucks and get it done right rather then waste a few track days with a car that isn't handling correctly.

The other thing to look at, and I say this with respect, is the driver. It is possible to induce understeer in these cars very easily if your transitions off the brake are not smooth... it might also be helpful to have an experienced driver take a lap or so to make sure it is the car that is causing the problems.
Yeah, I know this is the LAST car that should understeer like that. That's what makes the whole thing so frustrating. I think your alignment advice is right on track.
While I am far from a great driver, I do have some experience and understand how hammering the gas too early can induce understeer. That is not what's going on. The car understeers even when leaving the it in gear and letting off the gas 100% with the engine around 6K RPM while entering a turn. In other words, even with the front tires loaded significantly more than they are just by the weight of the car, it understeers. Very frustrating. The ONLY way I could get the back out was to trail brake, and it wasn't like I was just tapping the brake pedal a little bit to make it happen. I had to get on it a bit before the back end would come around. And yes, I know that has a lot to do with the amount of steering input at the same time, too.
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Last edited by Pat; 06-01-2010 at 05:43 AM.
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Old 06-01-2010, 04:14 AM   #7
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Quote:
Originally Posted by Lobo1186
what tires and what sizes are you running by the way? and if possible what rim sizes
The wheels are stock 18" Turbo Twists. The tires are stock sized RE050As, which I was very impressed with.
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