TPM...have to put in wheels for autox ?
09-25-2010, 11:04 AM
#1
Pro
Thread Starter
TPM...have to put in wheels for autox ?
I got a extra set of OEM wheels, putting Hoosier A6's on them.
I heard to takes a few miles for the TPM to set. Don't need the TPM for autox at all. Mistakenly I bought a set with my extra set of OEM wheels.
Any performance limitations by NOT having the TPMS in the wheels...can I still access any info from the cars dash like usual. Again any effects on PASM or anything else by not putting them in.
Thanks.
PS...also I don't balance autox wheels, and maybe the TPM inside the wheel would throw off the balance and make me balance them ?
I heard to takes a few miles for the TPM to set. Don't need the TPM for autox at all. Mistakenly I bought a set with my extra set of OEM wheels.
Any performance limitations by NOT having the TPMS in the wheels...can I still access any info from the cars dash like usual. Again any effects on PASM or anything else by not putting them in.
Thanks.
PS...also I don't balance autox wheels, and maybe the TPM inside the wheel would throw off the balance and make me balance them ?
09-25-2010, 11:29 AM
#2
Rennlist Member
Skip the TPM, you're right -- they'll never register because you won't drive far enough on those A6s for the computer to sort things out. There's no downside, you'll just get a "!" tire annunciator light on the dashboard and a warning message when you start up the car. No other issues, no PASM/PSM problems, or anything like that.
09-25-2010, 02:00 PM
#4
Pro
Thread Starter
For Autox the speeds are constantly changing. I have never noticed a balance changing anything. Generally on the street I think if a balance is off.....you can feel the oscillations around 50-60 mph something to do with the wheel rate of the suspension.
Hoosiers are much closer than regular street tires to not needing a balance anyway.
A lot of top autoxers don't balance.
Track stuff I am sure is quite different.....don't want no 130 mph oscillations of the wheel.
Hoosiers are much closer than regular street tires to not needing a balance anyway.
A lot of top autoxers don't balance.
Track stuff I am sure is quite different.....don't want no 130 mph oscillations of the wheel.
09-25-2010, 03:07 PM
#5
Is there such a thing as a "top autoxer"? : ) In any case, when I did cones, top speeds were around 100 mph. Even if I can't necessarily feel the balance, it's there. What's it cost to balance a $300 tire on a $1000 wheel? $5?
ps. These days, tire balance is already very good, especially compared to high sidewalls on 18's five or ten years ago. There's still "roundness" issues, which balance can help and goes directly to threshold braking performance.
ps. These days, tire balance is already very good, especially compared to high sidewalls on 18's five or ten years ago. There's still "roundness" issues, which balance can help and goes directly to threshold braking performance.
You bringing the 3 to GulfCoast Oct. 30/31.
09-27-2010, 12:46 PM
#7
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Geez...buy a fancy car and you won't balance the tires! I drove to my event on Sunday on my Hoosier's and wouldn't think of not balancing.
BTW-bringing my car down to West Palm for the winter. We'll have to catch up at an event but I will be on my streets.
Stu
BTW-bringing my car down to West Palm for the winter. We'll have to catch up at an event but I will be on my streets.
Stu
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09-27-2010, 01:53 PM
#8
Rennlist Member
SCCA course design rules for solo autocross call for a maximum course speed in the "mid 50’s to low 60’s" (exact quote). Heck, if it was a Miata driver or a Lotus driver who chucked out the cones it's wouldn't be unusual to not break 50mph on the course. At speeds that low a wheel has to be ridiculously out of balance to impact performance or safety.
Quoth the rules:
On the other hand, driving to an autocross on A6s seems like a really bad idea to me. A6s aren't designed to run that kind of heat for that long. You'd cook them even at modest street speeds. Maybe on a cold morning on surface streets you could get away with it.
Quoth the rules:
Courses must be tight enough so that cars run the entire course in their lower gears. Speeds on straight stretches should not normally exceed the low 60’s (mph) for the fastest Stock and Street Prepared category cars. The fastest portions of the course shall be those most remote from spectators and property. Turns should not normally allow speeds in excess of 45 mph in unprepared cars.
09-27-2010, 02:09 PM
#9
50 or 60 mph? Yawn! The whole point of the autocross with PCA was to find a venue where we could have a long "straight" ... usually diagonally from one corner of a parking lot to the other ... complete with bumps and dust in the braking area ... : )
09-27-2010, 02:23 PM
#10
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Most AX's are in that range but some are quite a bit faster but still fun and pretty challenging. I am sure Peter and David would back me up on that one as they both have done it at very competitive levels.
I am lucky enough to have two great venues only a couple of miles from my office so I change my wheels there and drive the short distance to the events. Not the best idea but no hitch on the car for my tire trailer or a larger one for the whole rig. Driving at moderate speeds with out heavy cornering for that distance does not hardly heat the tires at all.
Stu
SCCA course design rules for solo autocross call for a maximum course speed in the "mid 50’s to low 60’s" (exact quote). Heck, if it was a Miata driver or a Lotus driver who chucked out the cones it's wouldn't be unusual to not break 50mph on the course. At speeds that low a wheel has to be ridiculously out of balance to impact performance or safety.
Quoth the rules:
On the other hand, driving to an autocross on A6s seems like a really bad idea to me. A6s aren't designed to run that kind of heat for that long. You'd cook them even at modest street speeds. Maybe on a cold morning on surface streets you could get away with it.
Quoth the rules:
On the other hand, driving to an autocross on A6s seems like a really bad idea to me. A6s aren't designed to run that kind of heat for that long. You'd cook them even at modest street speeds. Maybe on a cold morning on surface streets you could get away with it.
Stu
09-27-2010, 03:01 PM
#11
Rennlist Member
I got a extra set of OEM wheels, putting Hoosier A6's on them.
I heard to takes a few miles for the TPM to set. Don't need the TPM for autox at all. Mistakenly I bought a set with my extra set of OEM wheels.
Any performance limitations by NOT having the TPMS in the wheels...can I still access any info from the cars dash like usual. Again any effects on PASM or anything else by not putting them in.
Thanks.
PS...also I don't balance autox wheels, and maybe the TPM inside the wheel would throw off the balance and make me balance them ?
I heard to takes a few miles for the TPM to set. Don't need the TPM for autox at all. Mistakenly I bought a set with my extra set of OEM wheels.
Any performance limitations by NOT having the TPMS in the wheels...can I still access any info from the cars dash like usual. Again any effects on PASM or anything else by not putting them in.
Thanks.
PS...also I don't balance autox wheels, and maybe the TPM inside the wheel would throw off the balance and make me balance them ?
09-27-2010, 04:13 PM
#12
Rennlist Member
Gulf Coast has speeds in the 70's at times and the last National Tour there we came within a smidge of hitting the rev limiter in 2nd in the 6GT3. Even had a moron protest the course as being to fast and violating SCCA rules.
Peter
Peter
09-27-2010, 06:54 PM
#13
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