Balancing tires on a track car |
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Balancing tires on a track car |
ThePaintedMan |
Aug 22 2014, 12:13 PM
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#1
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
Well I continue to learn more every day. I was always under the impression that even track cars have their tires balanced. I specifically remember seeing wheel weights on the rims of GT3 Cup cars at Sebring. But apparently a lot of people think it's a waste of time and energy to balance them since the tire moves on the rim in high-G corners, lock ups, etc. What say you, o 914 racing veterans?
-G |
Jetsetsurfshop |
Aug 22 2014, 01:15 PM
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#2
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
No veteran here, but heres what i've learned.
My tires do not move at all on my rims. I marked them to check. weight of car 1987lbs (without driver) brakes 911m calipers with hawk dtc-70 all around. HP we think about 150 Now, on my friends vette they just balanced the rims only. The tire moves on the rim for sure. I also have never been in a car that stops that aggressively. (IMG:style_emoticons/default/barf.gif) Maybe the GT3s are doing like my friend with the vette. |
ThePaintedMan |
Aug 22 2014, 01:27 PM
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#3
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
Yeah, that's what I think Shane. I think the speeds (or lack thereof) and both lateral/horizontal G's we're going to hit with the car are far less than what's necessary to spin the tire on the rim.
I'll bring them all with me and we can balance them as a "why not?" Can't hurt. I also considered that most of those Cup guys were balancing the rim. After a few stints it's probably built up enough rubber to throw that off anyway, but it's still probably a good idea. Not sure how aggressive those DTCs are, but the graphs that Porterfield shows on the R4-1 pads I'm putting on the car sure look impressive. With just crappy street pads I was braking at the last cone into the hairpin before... I wonder where the braking point will be NOW. (IMG:style_emoticons/default/blink.gif) |
ChrisFoley |
Aug 22 2014, 01:56 PM
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#4
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I am Tangerine Racing Group: Members Posts: 7,910 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
I doubt your tires will rotate on the rim with less than 200 hp, fairly small brakes, and a narrow body car.
Balance them. One of the worst feelings is on an outlap with a badly out of balance race tire from rubber picked up on the previous cooldown lap. It can shake so bad you'd think the car was about to fall apart. |
ThePaintedMan |
Aug 22 2014, 02:51 PM
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#5
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
Exactly the person I hoped would chime in (IMG:style_emoticons/default/smile.gif) Thanks Chris!
Though these are 180 TW tires, I don't think they're quite sticky enough to pick up rubber. Now what ends up on the inside of the rim is a different story. Sebring has marbles EVERYWHERE. |
carr914 |
Aug 22 2014, 03:28 PM
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#6
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Racer from Birth Group: Members Posts: 118,232 Joined: 2-February 04 From: Tampa,FL Member No.: 1,623 Region Association: South East States |
you could go with the Plastic BB balancing method
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Mblizzard |
Aug 22 2014, 03:30 PM
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#7
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Dyna beads? Just ordered some may have a track application if not against the rules. Won't matter if the tire moves.
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wndsrfr |
Aug 22 2014, 07:08 PM
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#8
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Senior Member Group: Members Posts: 1,428 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Not sure how aggressive those DTCs are, but the graphs that Porterfield shows on the R4-1 pads I'm putting on the car sure look impressive. With just crappy street pads I was braking at the last cone into the hairpin before... I wonder where the braking point will be NOW. (IMG:style_emoticons/default/blink.gif) You're going to LOVE those R4-1's......best stopping power I've had.... |
campbellcj |
Aug 22 2014, 07:10 PM
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#9
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I can't Re Member Group: Members Posts: 4,542 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California |
I have always had mine balanced (wheels+tires). The owner of my tire shop is a racer so they take extra care with racers' jobs.
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mepstein |
Aug 22 2014, 08:45 PM
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#10
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914-6 GT in waiting Group: Members Posts: 19,244 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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Matt Romanowski |
Aug 24 2014, 12:52 PM
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#11
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
Balance the tires and rims. Hoosier makes their beads bands a little looser than other companies so they tend to slip more than others, but I don't think you'll have much trouble.
If you have tires that always slip on the rims, then balance just the rim and don't worry about the tire being balance. |
brant |
Aug 24 2014, 06:37 PM
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#12
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914 Wizard Group: Members Posts: 11,615 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
adding plastic bb's to the inside of a track car seems like adding extra weight that does not make you faster...
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mepstein |
Aug 24 2014, 07:23 PM
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#13
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914-6 GT in waiting Group: Members Posts: 19,244 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
adding plastic bb's to the inside of a track car seems like adding extra weight that does not make you faster... for me it was 3oz per wheel. But now I don't have to pay someone to balance the wheels and no lead weights stuck on the rim. I think you can use less weight to balance since the weight is further from center so the balance effect is greater. Smooth is fast (IMG:style_emoticons/default/biggrin.gif) |
naro914 |
Aug 28 2014, 10:38 AM
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#14
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Losing my mind... Group: Members Posts: 2,476 Joined: 26-May 06 From: Charlotte, NC Member No.: 6,073 Region Association: South East States |
I always balance wheels with tires on them and it makes a HUGE difference IMO. I've thrown a weight (forgot to tape it) and noticed immediately. Can't imagine not balancing them...
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stugray |
Aug 28 2014, 01:08 PM
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#15
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
You also have to consider that most of us have some flavor of stock wheels which are old, and usually not perfectly straight/round.
So balancing seems to be a must. Even my "checked for out of round & straight" wheels have some pretty serious weights on them from the balancer. Besides, both of my sons work at tire shops, so I get it done for free. |
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