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11-10-2001, 05:31 PM | #1 |
Scooby Specialist
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:04 STI, 07 FXT |
Wheel Hop on Hard Launch
At the track I noticed that I was getting bad wheel hop on take off. On the street, this have never happened. Usually it will spin to varying degrees depending on how hard I launch. I am using the re-92s at 33psi.
Anyone have this experience or any ideas on a resolution? Thanks in advance, Greg
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11-10-2001, 06:39 PM | #2 |
Scooby Newbie
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Join Date: Jul 2001
Location: Lawrence Kansas
Vehicle:2002 Impreza WRX Blue |
33 PSI? I thought everyone was increasing pressure on the straightline track.... I am no drag racer though.
Kurt |
11-10-2001, 06:46 PM | #3 |
Street Racing Instructor
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Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:1989 1989 XT6 |
Wheel hop solution
Reduce your tire pressure! Your tires are too hard. High tire pressure caused wheelhop in my Outback Sport. I kept reducing my tire pressure and got down to between 22-24psi. That was perfect for eliminating wheel-hop. Try it out for yourself and you'll see.
If someone else here tells you to put more air in your tires, try that as well. You'll find out through experience what works. Hope I could help! Good luck! |
11-10-2001, 08:41 PM | #4 |
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Yes, you'll definitely want to reduce your tire pressure!! Depending on how much power you have, I know Al had to reduce his down to the 21 psi region to get the best results. Play around with it like Kevin said until you get it right.
Mike S. |
11-10-2001, 11:43 PM | #5 |
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Well, they say decrease, .... try it to see if that helps, then look at your times.
I say INCREASE, .... as in 50psi(RE92's sidewalls are WEAK), then look at your times. See what works best for you. We (the guys running RE92's here) have tried both and Definitely came to the conclusion of increasing tire pressure w/RE92s on the drag strip. We also increase the presure to 50 while autoxing, or on the race track. Just remember that at Higher speeds, or on a race track, your car Will act differently with different tire presures. RE92's just SUCK! I can't wait until I can afford some new tires! |
11-11-2001, 10:42 AM | #6 |
Scooby Specialist
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Join Date: Jul 2001
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Vehicle:04 STI, 07 FXT |
Well, what surprised me is that I wheel hopped at all. I have never heard of anyone else having this problem (am I the only one?). I think it is possible that the traction was so good the wheels had to hop unless they were able to spin (didn't use much clutch slip).
Greg |
11-11-2001, 11:29 AM | #7 |
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don't dump the clutch either. That's bad mmmkay.
Slip the clutch more, it's the wear item that is designed to save your tranny on hard launches. It's a balencing act, you will figure it out sooner or later. |
11-11-2001, 04:05 PM | #8 |
Scooby Newbie
Member#: 8334
Join Date: Jul 2001
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I gotta go with the RE-92s suck reply. I hate these tires, and after winter has had its way.... THEY GONE!!!!
And beyond everything, I think it's really cool this little car has enough power to even turn over the tires, being AWD and all. Kurt |
11-11-2001, 07:47 PM | #9 |
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TurboRex - If you're talking straight line drag, listen to the guys saying to lower your pressure. You want lower pressure to increase your contact patch. You don't have to worry about heat generated by underinflation because you're not driving far, and you don't need to worry about sidewall flex because you're not turning corners.
For autox or track, you want much higher. Higher for autox to prevent rollover (you want some rollover, but you don't want to scrape your wheels... pressure differs with every tire, but w/re92's, 45-50psi is good for starters), and higher for track/lapping events to prevent a blowout due to heat generated by underinflation. |
11-12-2001, 10:59 AM | #10 |
Scooby Specialist
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Join Date: Jul 2001
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In my orinigal question, all I am concerned about is wheel hop, NOT TRACTION. I guess I am the only that has ever experienced this so no one can really help me.
Thanks for trying though, I appreciate the help, just not answering my question on what is causing it and how to get rid of it. Greg |
11-12-2001, 09:07 PM | #11 | |
Street Racing Instructor
Moderator Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:1989 1989 XT6 |
What?
Quote:
You were looking for a resolution and people (including I) were trying to help you understand what was causing it and how to 'resolve' your situation. This falls under the 'anyone have this experience or any ideas on a resolution?" I even admitted to having wheel hop (Severe I must say and Trey Cobb told me how to deal with it) and offered a solution to get rid or at least reduce it....a resolution to the wheel hop problem. My wheel hop was so severe, it felt like someone was lifting my front end up and slamming it back on the ground over and over again. Also, your lack of traction is what is causing wheel hop. Hard tires have less contact patch than tires with reduced pressure. The lower the pressure, the more traction you have because of more contact patch. The more contact patch you have, the less chance of wheel hop. --->"Thanks for trying though, I appreciate the help, just not answering my question on what is causing it and how to get rid of it." Greg, what are you asking or saying? |
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11-13-2001, 10:59 AM | #12 |
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Join Date: Jul 2001
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Thanks Kevin for reposting. I am not sure what I was thinking but never saw what you said about your experience. I reread all the posts...must have had alot on my mind. I apologize.
Everyone seems to agree so will try lower pressure next time. Also, was told that I am dumping the clutch too fast. I might experiment with that too. However, I prefer tire spin over clutch slippage. I guess the only thing that seems perplexing is that I am sure that my car was bogging a bit. On the street, it gets nice spin and doesn't bog (unless I accidentally launch at too low of an rpm). Thanks, Greg |
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