MaladyMiata Posted July 3, 2015 Report Share Posted July 3, 2015 Hi I have just fitted some GAZ Gold Professional coilovers to my MK1 MX5 but I am having some difficulties setting the ride height. The springs are 400lb front 300lb rear. I also went for the MK2 type as the previous owner had MK2 Bilsteins on this car and the mounts were already with it. I am having difficulty setting the front ride height on either side as I am unable to raise it beyond 310mm from hub centre to wheel arch lip regardless of the perch height. I have tried perch heights between minimal pre-load and with the perch raised to less than 3mm below the top of the damper body's thread without any change in height. At full droop with the body raised the height between hub centre and wheel arch is approximately 375mm suggesting the rod length is ok. The rear ride height is adjusting correctly showing 345mm with the base of the lock nut to the base of the silver body set at 150mm. Was wondering if anyone had encounted this problem before and if so how it was resolved -310mm front looks good but I don't fancy shaving speedbumps! Quote Link to comment Share on other sites More sharing options...
NickT Posted July 3, 2015 Report Share Posted July 3, 2015 Did you torque up the suspension bolts with the car not flat on the ground with wheels on etc. You could have induced some twist in the bushes causing some preload Quote Link to comment Share on other sites More sharing options...
MaladyMiata Posted July 3, 2015 Author Report Share Posted July 3, 2015 Hi Nick I changed the units using the 'long bolt method' which was originally torqued up with the car suspended on axle stands. I did try and loosen and retighten the long bolt (one side only) with the hub jacked up enough to raise the car slightly to no avail. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 3, 2015 Report Share Posted July 3, 2015 Hello Did you know GGP also comes with different length springs..... You might need to measure the loaded length and contact GAZ. Quote Link to comment Share on other sites More sharing options...
Rich Posted July 3, 2015 Report Share Posted July 3, 2015 I think the wishbone has to be level so jack the knuckle/hub until it is, undo the bush and then re-torque. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 3, 2015 Report Share Posted July 3, 2015 It does, which is mid point of bump and droop. Quote Link to comment Share on other sites More sharing options...
MaladyMiata Posted July 3, 2015 Author Report Share Posted July 3, 2015 Thanks for the replies. Not sure if it's any help but I took a picture prior to fitting the springs, one had an ID sticker attached unfortunately it isn't the whole tag. What's noted is: GAZZMATIC 2.25 x 8.... x 400LB Quote Link to comment Share on other sites More sharing options...
Tony Posted July 3, 2015 Report Share Posted July 3, 2015 I think they should be 9" out of the box not 8". Quote Link to comment Share on other sites More sharing options...
MaladyMiata Posted July 3, 2015 Author Report Share Posted July 3, 2015 I wondered that myself after reading a post on here, I've been speaking with GAZ about this by email, their last message stated: "No because if the springs were to short then they would dislocate on full droop & then this would mean they are to short but if you still have some preload on them when the damper is fully open then they are correct, the spring fee length should be 8â€." I'll measure the length under load as you said. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 5, 2015 Report Share Posted July 5, 2015 So didn't they explain why you cannot adjust the height. Quote Link to comment Share on other sites More sharing options...
MaladyMiata Posted July 5, 2015 Author Report Share Posted July 5, 2015 I 've replied asking for any further suggestions but I'm yet to hear back.. Spring lengths OSF accuracy as best possible with a tape measure on reasonably level ground. Unable to reach to measure spring with wheel attached so simulated by raising/lowering hub: Minimal pre-load, full droop: 200mm Minimal pre-load, horizontal wishbones: 175mm Minimal pre-load, fully loaded: 150mm 1 thread visible above top perch, full droop: 185mm 1 thread visible above top perch, horizontal wishbones: 155mm 1 thread visible above top perch, fully loaded: 142mm Quote Link to comment Share on other sites More sharing options...
Tony Posted July 6, 2015 Report Share Posted July 6, 2015 Comparative data is for them to confirm or deny...... Question though, when you ran out of height adjustment did the suspension droop when the cars jacked up? Quote Link to comment Share on other sites More sharing options...
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