SJMKIV Posted June 14, 2013 Share Posted June 14, 2013 Hey guys, Im having wheel hop issues on my '95 BPU Supra for a while now, and have tried various things to try and resolve it. But yet the problem exists. The moment the wheels lose traction in the straight line, I get wheel hop and no wheel spin, especially in the wet. This doesn't happen on cornering, the car slides well, but the moment it's in a straight line, there is wheel hop. Some background on the suspension and tire setup: Tien SuperStreet suspension Rear - 275/35/18 Yokohama advan sport Trying to resolve the wheel hop issue is have installed: PHR solid differential ear mounts - front of diff PHR solid differential mounts - rear of diff PHR solid subframe mounts PHR rear subframe mounts for sway bars I've also installed new OEM suspension components due worn bushings and rubber: Oem rear upper control arms - 48770a/ 48790 Oem rear toe control arms - 48710a/ 48720a Oem rear lower arm - 48730f / 48740f Oem rear anti roll bar link stabilizer - 48830d/ 48840a Oem traction rod - 48780a (rh & lh) Any suggestions on what else could be causing wheel hop? I've already spent a fortune trying to resolve this issue. I'm lost on what more I can do. I have taken advice of many members on other threads (relating to wheel hop) on this forum. Pls help!! Thanks SJ Quote Link to comment Share on other sites More sharing options...
David P Posted June 14, 2013 Share Posted June 14, 2013 Have you checked there is no play in the rear wheel bearings? Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 14, 2013 Share Posted June 14, 2013 I'd be having a look at the dampers and springs Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 14, 2013 Author Share Posted June 14, 2013 I'd be having a look at the dampers and springs The dampers and springs are relatively new SJ Quote Link to comment Share on other sites More sharing options...
Ian C Posted June 14, 2013 Share Posted June 14, 2013 Are they rock hard? Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 14, 2013 Author Share Posted June 14, 2013 Are they rock hard? They are stiff, but not rock hard. Infact the damping force is set to its softest setting. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted June 14, 2013 Share Posted June 14, 2013 (edited) ..... Sorry, did not read the OP properly. Edited June 14, 2013 by Samurai 20V (see edit history) Quote Link to comment Share on other sites More sharing options...
garethr Posted June 14, 2013 Share Posted June 14, 2013 What's the condition of the control arm bushes? Is it better or worse if you increase the damping? (Not that I know anything about suspension tuning, you understand. ) Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 14, 2013 Author Share Posted June 14, 2013 What's the condition of the control arm bushes? Is it better or worse if you increase the damping? (Not that I know anything about suspension tuning, you understand. ) Control arm bushes are brand new. All suspension components replaced with new OEM components last month. Wheel hop is about the same with different settings. Apart from the ride becoming unacceptable with a stiffer setting. Quote Link to comment Share on other sites More sharing options...
David P Posted June 14, 2013 Share Posted June 14, 2013 Is the wheel and/or tyre running round and true and well balanced? Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 15, 2013 Author Share Posted June 15, 2013 Is the wheel and/or tyre running round and true and well balanced? I'm hoping the tyres are round as expected, they were replaced 3 years back (not too many miles on them since). No issue on alignment and balancing. SJ Quote Link to comment Share on other sites More sharing options...
chazuk Posted June 15, 2013 Share Posted June 15, 2013 I had this on my tt at 400hp noise was so bad it sounded like the diff was going to fall out , going single cured it more power lol Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 15, 2013 Author Share Posted June 15, 2013 I had this on my tt at 400hp noise was so bad it sounded like the diff was going to fall out , going single cured it more power lol Unfortunately no budget for a single setup! Is there anything in missing out with respect to the suspension, diff or axle? Quote Link to comment Share on other sites More sharing options...
David P Posted June 15, 2013 Share Posted June 15, 2013 Is there anything in missing out with respect to the suspension, diff or axle? I'm hoping the tyres are round as expected, Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 17, 2013 Author Share Posted June 17, 2013 Apart from checking if the tyres are perfectly round, is there anything else that I should look into? SJ Quote Link to comment Share on other sites More sharing options...
David P Posted June 17, 2013 Share Posted June 17, 2013 If you have access to, it would be simplest to try another pair of wheels/tyres from a Supra that's not hopping. Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 17, 2013 Author Share Posted June 17, 2013 If you have access to, it would be simplest to try another pair of wheels/tyres from a Supra that's not hopping. Ideally that would be the best thing to do. But unfortunately Supras are rare and scarce where I am, and is probably the only supra in the city. I'll however still try and find some tires of the same size, unlikely though. SJ - - - Updated - - - If you have access to, it would be simplest to try another pair of wheels/tyres from a Supra that's not hopping. Ideally that would be the best thing to do. But unfortunately Supras are rare and scarce where I am, and is probably the only supra in the city. I'll however still try and find some tires of the same size, unlikely though. SJ Quote Link to comment Share on other sites More sharing options...
Ian C Posted June 17, 2013 Share Posted June 17, 2013 How heavy are your wheels? A lot of unsprung mass can cause wheel hop. I used to get this with heavy old Speedline's on. I don't get it with Volks that are half the weight each. Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 17, 2013 Author Share Posted June 17, 2013 How heavy are your wheels? A lot of unsprung mass can cause wheel hop. I used to get this with heavy old Speedline's on. I don't get it with Volks that are half the weight each. I'm running Volk GTS wheels. 18" Quote Link to comment Share on other sites More sharing options...
David P Posted June 17, 2013 Share Posted June 17, 2013 If there's a Lexus about, the rear wheels off one of those would be fine for testers. Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 17, 2013 Author Share Posted June 17, 2013 If there's a Lexus about, the rear wheels off one of those would be fine for testers. Unfo Lexus isn't sold in India! Quote Link to comment Share on other sites More sharing options...
David P Posted June 17, 2013 Share Posted June 17, 2013 (edited) Mazda RX7/8 and maybe Aston Martin from DB9 on? There must be some old Cressida's rattling about? Edited June 17, 2013 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
SJMKIV Posted June 18, 2013 Author Share Posted June 18, 2013 Mazda RX7/8 and maybe Aston Martin from DB9 on? There must be some old Cressida's rattling about? Keeping a lookout for something which is running on a similar size Quote Link to comment Share on other sites More sharing options...
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