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Car Forum / BMW Cars / December 2008'01 M3 axle hop
Hi All. What can be done to reduce or prevent axle (wheel) hopping during a holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. TIA hello , what exactly is " axle hopping " ? is your " DSC " switched on ?+ Dick > Hi All. What can be done to reduce or prevent axle (wheel) hopping during > a holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. > TIA The DSC is switched off. The holeshot I am talking about is a drag racing sort of start. Rev the motor a bit and dump the clutch. When a lot of throttle is used and tires start to spin, at a certain point the rear wheels will begin to bounce. Sometimes it will actually shake the trans into neutral (from first gear). In the old days, "traction bars" were used to control this sort of thing. > hello , > what exactly is " axle hopping " ? [quoted text clipped - 4 lines] >> a holeshot start? It's pretty bad through first gear on my 2001 M3 >> Couple. TIA I think you need anti-tramp bars - should be available from your local "hop-up kit" store (sic) And letting the tires (sic) down a bit might help ... Why's it called a holeshot start??? > The DSC is switched off. The holeshot I am talking about is a drag racing > sort of start. Rev the motor a bit and dump the clutch. When a lot of [quoted text clipped - 11 lines] >>> during a holeshot start? It's pretty bad through first gear on my 2001 >>> M3 Couple. TIA >The DSC is switched off. The holeshot I am talking about is a drag racing >sort of start. Rev the motor a bit and dump the clutch. When a lot of >throttle is used and tires start to spin, at a certain point the rear wheels >will begin to bounce. Sometimes it will actually shake the trans into >neutral (from first gear). In the old days, "traction bars" were used to >control this sort of thing. Traction bars don't really control the hop much, but they keep you from tearing your rear end apart when it hops. Are you using slicks? --scott  Signature"C'est un Nagra. C'est suisse, et tres, tres precis." >Hi All. What can be done to reduce or prevent axle (wheel) hopping during a >holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. TIA Is your goal to prevent hopping completely so you can get off the line faster, or are you only worried about the shear torque produced damaging your differential? Have you already got good tires on? Is your positraction working? --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." The posi works perfectly. The tires are Goodyear F1s (I think that's what they are called). I'm not running slicks. Not looking for a true drag racing set-up. All I want to do is have "fun" a little more safely so not to damage the suspension or anything else. >>Hi All. What can be done to reduce or prevent axle (wheel) hopping during >>a [quoted text clipped - 7 lines] > Have you already got good tires on? Is your positraction working? > --scott >The posi works perfectly. The tires are Goodyear F1s (I think that's what >they are called). I'm not running slicks. Not looking for a true drag racing >set-up. All I want to do is have "fun" a little more safely so not to damage >the suspension or anything else. I'm not a performance guy, but some basic thoughts: 1. Better tires will give you better traction. Not that the F-1 tires are bad tires at all... but obviously they aren't doing the job that you want. 2. You need to reinforce the differential and axle to prevent damage when wheel hop occurs. There are various reinforcing bar arrangements out there, but what you want is a "4-link." This won't stop wheel hop, but it will prevent damage when it happens. I don't know if anybody makes such a thing for the M3, but the Dinan guys probably will. 3. Adding weight to the rear of the car will improve traction. On the other hand, it will also slow acceleration as you have more mass to accelerate. 3. You need to feel the car as you pull out, and ride the pedal so it doesn't hop so much. Practice. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." > Hi All. What can be done to reduce or prevent axle (wheel) hopping during > a holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. > TIA Switch the DSC on. I don't want the DSC on. I want to play! Isn't that one reason we drive M3s? :) >> Hi All. What can be done to reduce or prevent axle (wheel) hopping during >> a holeshot start? It's pretty bad through first gear on my 2001 M3 >> Couple. TIA > > Switch the DSC on. No that's the reason one buys US cars with huge V8's and pathetic dynamics. >I don't want the DSC on. I want to play! Isn't that one reason we drive >M3s? :) [quoted text clipped - 4 lines] >> >> Switch the DSC on. WRONG !!!!!!! what DID you buy yours for ? dick > No that's the reason one buys US cars with huge V8's and pathetic > dynamics. [quoted text clipped - 7 lines] >>> >>> Switch the DSC on. >>>I don't want the DSC on. I want to play! Isn't that one reason we drive >>>M3s? :) >>> >> No that's the reason one buys US cars with huge V8's and pathetic >> dynamics. > WRONG !!!!!!! > what DID you buy yours for ? > dick Performance, handling, comfort, safety etc. NOT to show off to the other boys. > Hi All. What can be done to reduce or prevent axle (wheel) hopping during > a holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. > TIA Check your shocks and bushings........ The toe angle of the rear tires is changing during the burn out. Thanks for the first "reasonable" comment, Nicik. Too many snobs here. I've actually considered that the shocks and bushings may be worn. I have replaced the control arm bushings. The shocks are next. And for the record, I enjoy performance, comfort, styling, etc. But I also like to push the performance limits of the car as well. >> Hi All. What can be done to reduce or prevent axle (wheel) hopping during >> a holeshot start? It's pretty bad through first gear on my 2001 M3 >> Couple. TIA > Check your shocks and bushings........ > The toe angle of the rear tires is changing during the burn out. >Thanks for the first "reasonable" comment, Nicik. Too many snobs here. I've >actually considered that the shocks and bushings may be worn. I have >replaced the control arm bushings. The shocks are next. And for the record, >I enjoy performance, comfort, styling, etc. But I also like to push the >performance limits of the car as well. Note that even if the shocks and springs ARE good, using a stiffer than normal shock and spring in back (ie. increasing the resonant frequency of the rear end tuning to above the frequency that the thing is hopping at) might help. It'll have plenty of other consequences, though. I don't like that as a solution, but you might. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." 2nd reasonable response. Thanks, Scott. >>Thanks for the first "reasonable" comment, Nicik. Too many snobs here. >>I've [quoted text clipped - 10 lines] > like that as a solution, but you might. > --scott >2nd reasonable response. Thanks, Scott. You don't think my earlier response about reinforcing rods was reasonable? --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." I didn't mean that. Your earlier response was useful and respectful. Sorry for the oversight. >>2nd reasonable response. Thanks, Scott. > > You don't think my earlier response about reinforcing rods was reasonable? > --scott > Thanks for the first "reasonable" comment, Nicik. Too many snobs here. > I've actually considered that the shocks and bushings may be worn. I have > replaced the control arm bushings. The shocks are next. And for the > record, I enjoy performance, comfort, styling, etc. But I also like to > push the performance limits of the car as well. Your welcome......... >>> Hi All. What can be done to reduce or prevent axle (wheel) hopping >>> during a holeshot start? It's pretty bad through first gear on my 2001 >>> M3 Couple. TIA >> Check your shocks and bushings........ >> The toe angle of the rear tires is changing during the burn out. >Hi All. What can be done to reduce or prevent axle (wheel) hopping during a >holeshot start? It's pretty bad through first gear on my 2001 M3 Couple. TIA just curious if you ever got this fixed ? There is no way that that is normal. On a solid axle 1995 mustang perhaps , not on the M3 Partially. I has the arm (?) bushings replaced and that seemed to help overall. The replacement Sachs shocks are pretty hard to come by in these parts. I had to special order them and that was 6 weeks ago. I'm told they'll be in my hands in a couple of days. We'll see... >>Hi All. What can be done to reduce or prevent axle (wheel) hopping during >>a [quoted text clipped - 3 lines] > just curious if you ever got this fixed ? There is no way that that is > normal. On a solid axle 1995 mustang perhaps , not on the M3 |
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