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Fun at Brainerd Intl Speedway!

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Old 07-06-2005, 04:39 PM
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Woodster
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Default Fun at Brainerd Intl Speedway!

Did my first track event...wahooo!!! 3 mile long, 10 turns.
three spots on the track you can hit above 110 mph. front straigt ==
160 plus (more if you have more guts than me on street tires), first turn
I had the stomach for about 120 mph, others could go faster. 40 cars,
mixed event with (2) modified vipers (650 hp tommy archer car with
moton suspension, cage, etc.), z06's, supercharged c5 vette, 04 supercharged
cobra, 996tt, one other 993tt and my buddy's Carrera GT! we had a blast,
unlimited track time.
Conclusions: stock pads will last only a few laps on a high speed track
(I switched to pagid race pad and they worked flawlessly).
The 993tt has I lot more than I could give it, but it is fairly easy to
drive fast on the track---(which can be a danger!!)
A person should really have a cage in their car for high speed events!
Those damn vipers and a well driven c5 zo6 are very good track cars.
Nothing can touch a reasonably well driven Carrera GT on the track,
the torque, steering and "hand of god" brakes are UNBELIEVABLE.
BE CAREFUL and it is a blast
Old 07-06-2005, 05:02 PM
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Stummel
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Congrats! Did mine a month ago.
The car is really easy to drive and you have to remind yourself sometimes that too fast can be dangerous.

Did you loose a lot of tire tread that day?
Old 07-06-2005, 07:57 PM
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Woodster
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The old bridgestone so2 will need replacing soon, the left side tires
take a beating on this particular track and some guys (with hoosier
slicks were swapping the two fronts side to side to double their tire
wear.
Old 07-07-2005, 12:53 AM
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tlark
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I was given an invite to put my car in a trailer and attend the Aug 5-7 PCA/DE @ BIR, however nothing is firm yet. You ran S02s at what pressure. S02s are pretty hard by comparison now days, I assume the track is abrasive.

If I come I may try to milk another weekend out of my 02's, that is why I ask.
TIA
Old 07-07-2005, 10:40 AM
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Woodster
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I ran higher pressure than most to preserve my S02's. Yes they are hard and people with stickier
tires could outcorner my car on the back 7 tight turns of brainerd. I was surprised how well they
held up. The one other 993tt was running slicks (Hoosier) and could really whip thru the tight
corners, where I would slide some...sure is fun to slide though! pressures = 34f and 38r.
mk
p.s. you will love Brainerd, if you like speed!
Old 07-07-2005, 11:38 AM
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Wow, Marty, those are high pressures if these are cold temps!

My experience, for whatever it's worth, has been to target 40 psi hot on all fours. Depending on ambient temperature, cloud cover, humidity, etc., I'd normally start around 32psi front and 31 psi rear.

Ignore the pressure recommendations in the manual. Over-inflating the rears will make the car very unstable at BIR. The speed will heat up tires significantly, and if you imagine a thin band of tire taking all the presssure of the BIR turns, you can see how slippery the tire becomes. It doesn't take much to upset the car balance and spin.

Running my S03s at the above pressures, I was still showing signs of slight over-inflation on the rears.

If you're going to BIR, take a good tire gauge with you and check the tires hot. 40 front and rear hot for street tires seems to be about right, IMHO.

Jim
Old 07-07-2005, 12:17 PM
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Rob 97 993c2
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jim- while i do agree with 40 psi (hot) as a goal, why do u start with 32/31. Im told there should be about a 3-4 psi difference between front and rear with the rear being higher (to prevent the back from getting too nervous and due to the awd). Ive always wondered about this.
thanks
Old 07-07-2005, 04:24 PM
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dbf73
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Marty - you can add at least 10 mph to your top end by doing some bump drafting/pushing with a like-minded partner.
Old 07-07-2005, 05:48 PM
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Woodster
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I did that with a viper on slicks and just about wet my pants---I let off just before turn #1.
Old 07-07-2005, 07:00 PM
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Camber
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Rob:

I had the same question when I first started taking my car to the track. In fact, I had a minor spin (no damage) in Turn 10 of BIR when I finished my first session with tires filled to factory specifications, which I recall now to be something like 38 front and 44 rear (could be way off on my recollection).

The rear end is 60% of the weight, so on the track, the rears heat up significantly more than the fronts. I spoke with no less than a dozen 911 drivers at BIR when I first started, and I, 1) got a lot of conflicting advice, and 2) was struck by how everyone had only 1 PSI difference front to rear (some biased towards the front, some towards the rear). So I concentrated on the fast, most accomplished drivers and found consistency with the settings I've described above.

The best advice is to draw your own conclusions though. A tire inflated to 31 rear will flex more than a tire inflated to 33 rear, so it may heat up more, which may close the gap in rear pressure, but at different tire temps. You'll have to experiment to find the best settings for you.

What I am doing seems consistent with what leading club racers are doing, and the car feels very balanced to me at high speed, and the hot pressures are balanced at 40 psi all around.

Jim



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