Should be great info.
If you can find a big parking lot where you won't get arrested for making
noise, you might want to try skid pad testing. Just chalk about a 200 foot
circle and drive around it as fast as you can for about ten laps and take
your tire temps. Reverse and repeat. Then make one change at a time and
repeat. Not only can you easily see what the tire is doing (both temps and
wear patterns) but you'll also get great feedback on how the car is handling
since there's nothing to concentrate on other than following the chalk line.
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
Of joe dirt
Sent: Wednesday, June 21, 2006 11:13 AM
To: BillDentin@aol.com; fot@autox.team.net
Subject: Re: [FOT] Re: Hoosier Speesters
I had this all written out in one big report, but my email couldn't handle
it and I lost it. What just sent through the list was written off memory.
I don't have the information in front of me at the moment. I do remember
changes, but I'm not going to state them until I have the exact data as to
not confuse things. When it comes my way again (I'll hopefully have it for
you tommorow) I'll type it all up in a very detailed and easy to read
fashion.
This doesn't apply to our cars but I'll tell you what the Porsche guys
have found and are running.
After Sat's Qualifying race, one of the Porsche 356 drivers came over,
one to compliment on all the nice saves from that sway bar incident, and
another to talk about the Hoosier Speedsters. This fellow started the
weekend at around 32lbs hot air pressure. With the recommendation of Vic
Skirmants, he bumped air pressures up until they were reading 37lbs hot. He
dropped 4 seconds a lap with just this change. I talked to Vic later on and
he confirmed this is what they are running. Car weights are approx 1650lbs
and negative camber is -2 degrees. The tread also showed to be "rolling" a
little more than that of the Dick's Triumph. This is ODD. The lighter the
car the lower you run the air pressures, not so apparently with the
Porsche's. Vic was running mid 2'19's to low 2'20's throughout the weekend.
Looking at their tires, they too were showing more wear in the center
section than the outers, but I expected to see more considering the tire
pressures they are running. BUT remember, these are a different type of
car, with a different type of a suspension.
As I said, I'll write up a nice report when I get the information. We
have a quick Spec Miata racer / set-up guy among our ranks; he was there
and has ALL the data at the moment, and he, I, Dick , and a few others are
hard at work getting these things exactly where they should be before the
next event. The Zippo GP should be interesting..
-Bob
BillDentin@aol.com wrote: In a message dated 06/21/2006 11:04:09 AM Central
Daylight Time, oldskooling@yahoo.com writes:
. Tires were reading about 31lbs hot, and the pyrometer was showing them
to be hotter in the middle than the outsides.
Bob:
It is not clear to me what tire pressures you folks 'started with', and
what changes you made during the week end.
Bill Dentinger
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