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03-13-2011, 11:04 AM | #1 |
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How to fix bouncy issue at track?
I tracked at Buttonwillow yesterday, found that the rear was some sort of bouncy, typically at some corners like Bus Stop. How can I fix this issue? I played with Rebound and compression a bit, but didn't help. I have KW V3 BTW
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03-13-2011, 12:44 PM | #4 | |
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- what does "bouncy" mean? a. the rear of the car wallows around while you're in the corner b. the rear of the car bounces off bumps in the road c. the rear of the car kind of skitters sideways a. is caused by too little rebound b. is caused by too much compression c. is caused by too much rebound When it's properly adjusted, the chassis will move around on the springs more than you might be used to, but it will produce maximum grip. |
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03-13-2011, 09:02 PM | #5 |
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Here's a suggestion.
Keep your car stock until you understand why you should mod it. If you buy a double adjustable coil-over kit and don't know how to adjust it ... or explain what it's doing ... you probably had no business modding it in the first place.
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03-13-2011, 09:05 PM | #6 | |
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Dinan compliment of stuff plus PF rotors and RG63s. Enough for now. Why, yes. I am an abrasive bastard. |
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03-13-2011, 09:09 PM | #7 | |
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I don't mean to sound like an @ss but you came off like one with your post so it's only fair. |
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03-13-2011, 09:14 PM | #8 |
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Typically, the initial loss of adhesion (the bounciness) is due to having too much rebound damping. As the car starts to roll in a corner, the inner wheel droops to the ground. If you have too much rebound damping, this slows down the process, and hence you loose traction at the inner wheel.
Also, if this happens at a corner after hard braking, you may want to increase the front compression damping to reduce the amount of diving. So at what part of the corner do you experience this? Initial turn-in, mid-corner, or exit? |
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03-14-2011, 08:42 AM | #9 | |
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I have this annoyance with all the vendors out there selling people things they don't need. I'm also annoyed with the people out there gullible enough be believe they need this stuff or that it makes their car "better". How much do you want to bet that pretty much any driver would be faster in the OPs car around Buttonwillow with the stock suspension compared to it's current configuration?
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03-14-2011, 09:03 AM | #10 | |
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03-14-2011, 10:12 AM | #11 | |||
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I played with the suspension a bit on sunday, ended up increasing the rear's rebound by 4 and compression by 2.(I don't remember where they are at, I adjust them only think they are needed) That gave me the best feel at the track. I had better feeling through the corners, more crispy feel. However, the "bouncy" didn't go away. it happens only at high speed cornering which requires acceleration or going downhills. It's mid-corner to exit. It didn't slow the car like tires aren't stick to the ground. it just bouncy during turns makes me have less confidence to keep pushing it. |
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03-14-2011, 10:17 AM | #12 | |
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03-14-2011, 11:58 AM | #13 | |
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03-14-2011, 11:59 AM | #14 |
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If it's happening mid-corner to exit on accel, you could be too low in the rear, I would try increasing front rebound a little and raising the rear ride height. Put something on your rear bump stops to check if you're riding on them, I suspect you are hitting them intermittently on accel. Take a grease pencil and mark surface of the bump stops and see if anything transfers from the bump stop to the other side.
Don't call people trolls when you haven't even asked the right questions. Your lap time in your signature is more than 2 seconds slower than a 140hp Spec Miata with an average driver gets around that track. Not something I'd be bragging about with 420+bhp. An M3 with a few upgrades should be in the mid-40's, so you obviously have lots to learn. You can call me a troll all you want, but the other guys in this thread are making pretty valid points, I think, so maybe you should try learning from them instead of getting defensive?
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Last edited by Richbot; 03-14-2011 at 12:10 PM.. |
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03-14-2011, 12:04 PM | #15 | |
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03-14-2011, 12:16 PM | #16 | |
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03-15-2011, 01:24 PM | #17 |
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03-15-2011, 09:24 PM | #18 | |
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I just did some search about Infineon. I think you are talking about different layout. The layout I ran was called "Full course with Carousel CW". Here's a list of laptime who ran at the same day with me: http://www.speedventures.com/results/Default.aspx |
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03-15-2011, 10:35 PM | #19 | |
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03-15-2011, 10:56 PM | #20 |
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03-16-2011, 01:09 PM | #22 |
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Ok, North end of San Francisco Bay between Novato and Vallejo?
You were on the dark layout?
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