Do you still regularly launch the E39 and what performance to expect? - Page 2 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #11 of 13 Old 18th April 2017, 01:42 PM
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Originally Posted by Larry's M5 View Post
I went for full on hard launching last night, but I think something just went LOL Bad wheel hop and guess it's time to look at rear joints and guibo before anymore launch for me....
If I lose traction on a launch it's all wheel hop like crazy. The only thing that hasn't been replaced in my suspension/drivetrain is the RSF bushings so it must either be them or just inherent with the M5. Everything else including the DS has been replaced and it's still hop central if I break loose. Of course, a perfect launch isn't going to be breaking both tires totally loose so she leaps off the line quite nicely with minimal traction loss if I do it right.

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post #12 of 13 Old 18th April 2017, 02:23 PM
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If you get wheel hop, get out of the throttle immediately. Do not power through wheel hop unless you want to deal with the consequences. Wheel hop depends on many, many variables from tire/road surface coefficient of friction, sidewall spring rate, torsional drivetrain stiffness and damping rates (one of the most important variables), suspension spring rate, suspension damping rate, bushing spring rates and damping rates, stiffness of suspension components, subframe, and body-in-white, etc.

The ones you most likely can easily affect (tires, road surface, rate clutch engagement vs rate power applied) will yield a widely varying outcome in whether you produce the wheel hop for a given launch. If you get the weight transfer right on the initial few 10ths of a second, you can hook up the tires hard and get a great launch (60' time) without undue stress (abuse) on the car.

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post #13 of 13 Old 18th April 2017, 10:04 PM
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Quote:
Originally Posted by M3Fan View Post
If I lose traction on a launch it's all wheel hop like crazy. The only thing that hasn't been replaced in my suspension/drivetrain is the RSF bushings so it must either be them or just inherent with the M5.
I don't think it is inherent with the M5. I drive it pretty hard and have never experienced this, thankfully.
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