Mike B Posted February 20, 2006 Share Posted February 20, 2006 Sounds worse than it is, but my tyres actually hit the inner upper wheel arch on maximum compression - there seems to be no "bumpstop" to prevent the wheel from moving up into the wheel arch... My shock is not quite the same as the stock setup, most noticably I am missing the "spring bumper" in the attached image... most of the insulator is also cut away. Shocks and springs are KYB. does this spring bumper act as the bump stop/limiter? please help! Link to comment Share on other sites More sharing options...
Lucifer Posted February 20, 2006 Share Posted February 20, 2006 Sounds like you have the worng offset wheels, are they standard? Link to comment Share on other sites More sharing options...
Mike B Posted February 20, 2006 Author Share Posted February 20, 2006 First question- I should have said. They are the same wheels and tyres as on my old sup Racing Hart - 275x30r19 rear, 235x35r19 front. Supra offset - as bought from Envy, and they never causght on my old sup and those coilovers were bloody harsh but extremely low- I had to raise it up! When I bought the car it had skyline wheels on and they caught the outer arches (don't ask!) but I am certain the wheels are perfect fit/offset. Link to comment Share on other sites More sharing options...
Lucifer Posted February 20, 2006 Share Posted February 20, 2006 Ah 19's... Yes maybe your suspension is a littel saggy? Link to comment Share on other sites More sharing options...
Mike B Posted February 20, 2006 Author Share Posted February 20, 2006 saggy or not theystill shouldn't hit the top of the wheel arch. I just need to know if anyone who konws this setup can tell me if that partof the shock limits compression as a bumpstop... Link to comment Share on other sites More sharing options...
jamesmark Posted February 20, 2006 Share Posted February 20, 2006 i hade 19" on my soop with a standard set up and never ever rubbed, but now its been floored with eibach springs and i have dropped to 18" wheels and for some reason i am rubbing but that reason is .............. the screen was tubes coming out into the wheel arch, and by the way i would not recommend a drop in the soop unless you dont have an after market front as i smashed my bumper as i grounded it going at 0.00001 mph done a ramp so mines is getting raised again, i have a top secret front end and its bloody low and i have about 1.5" clearance Link to comment Share on other sites More sharing options...
AJI Posted February 21, 2006 Share Posted February 21, 2006 The cheapest and fastest solution is to buy some of those spring assistors.... Halfords are currently selling them. They are made by a company called Grayston and they fit between the coils of your spring and act in two ways. Firstly they act in stiffening the spring slightly and they stop the spring from compressing all the way up. And secondly they act like an assitor to the shock absorber when in compression. I have the problem of mine catching the rear wheel arch slightly because I have 285 width tyres. Fitted a spring assitor on each spring and the problem has dissapeared. You'll have to measure the coil separation to be able to get the correct size. Too big and you end up raising your car by a millimeter or two, too small and they don't work at all. Link to comment Share on other sites More sharing options...
Mike B Posted February 21, 2006 Author Share Posted February 21, 2006 Thanks AJI, Sounds like a good backup plan. The springs I have at the moment are kyb - interesting looking things with two definate coil winds - I bought some tien to replace, but there are shorter than the original - I thought I must have had a chopped set, but now I may well put the larger KYB one back in on the new shocks. I'll get that rubber part from Toyota, fit it and if that doesn't work I'll use the fall back plan! I didn't want to go coilover as they have no extension and are dangerous on our back roads - it unweight the tyres badly, feels like you are on a fairground ride. Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 21, 2006 Share Posted February 21, 2006 You MUST have the bump rubbers or serious suspension damage can occur. Your problem is almost certainly due to you using incorrect wheels and tyres, but the safety feature of the bump stops is removed, so you are sailing close to the wind on two fronts now. Link to comment Share on other sites More sharing options...
Mike B Posted February 21, 2006 Author Share Posted February 21, 2006 Thanks Chris, I was hoping you were going to post. Yeah I know - 19's are not your choice of prefrence - TBH I would have gone 18 if I had the info before I bought 19, for a whole load of reasons (including cost!), but having made the buy - I'm kind of stuck. They look awesome though!! You are right - the size and a stretched 30 sidewall are not ideal:( I had a feeling that rubber did something - thanks for confirming. Interestingly enough - the rears don't have rubbers and don't bottom out, still I'll order and put them back on. Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 21, 2006 Share Posted February 21, 2006 On one particulary application, on 19 inch rims, I had to make custom bump rubbers for the front to keep the tyres off the inner arches. I think Demon Tweaks keeps some longer and different grade bump rubbers, as do HKS. It's a cludge, but maybe necessary in your case. You need to make the spring rate rise quite steeply, but SMOOTHLY as the suspension travel, or in your case, wheel travel, is exhausted. TOO steep and the car will exhibit dangerous and sudden handling chnages as it rolls or the front drops under braking. Link to comment Share on other sites More sharing options...
Mike B Posted February 21, 2006 Author Share Posted February 21, 2006 You need to make the spring rate rise quite steeply, but SMOOTHLY as the suspension travel, or in your case, wheel travel, is exhausted. TOO steep and the car will exhibit dangerous and sudden handling changes as it rolls or the front drops under braking. I think I know what you mean - the suspension on the existing KYB springs has massive extension - but sits low. The fact that it hits the arches under normal driving conditions occasionally is not a good sign, I bought some tien sport springs but these have less extension, but may sit the car higher, and give more useful performance under compression. I need to have a trawl through their websites to see if I can get any ride height comparisons between the two. Chris - do you have a preferred spring mfr for the Sup? Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 21, 2006 Share Posted February 21, 2006 Chris - do you have a preferred spring mfr for the Sup? Yes. Me! Link to comment Share on other sites More sharing options...
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