[KMR968Turbo]

When I bought a coil over set up for my 93 RX7 a very knowledgable track guy said to set the front and rear ride height such that from the middle highest point of the fender lip was 25 inches from the ground. I have never seen a measurement like this for either my 951 or 968. Does anyone have a measurement that is recommended for a M030 car? Or do I just go get it corner balanced? I currently think my car may be lowered too far is why I am asking.

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[au968]

[quote name='KMR968Turbo' post='28062' date='Nov 18 2006, 03:01 PM']When I bought a coil over set up for my 93 RX7 a very knowledgable track guy said to set the front and rear ride height such that from the middle highest point of the fender lip was 25 inches from the ground. I have never seen a measurement like this for either my 951 or 968. Does anyone have a measurement that is recommended for a M030 car? Or do I just go get it corner balanced? I currently think my car may be lowered too far is why I am asking.[/quote]



It's in the Tech Specs booklet.



"On U.S. Vehicles, the bumper height is used as a reference. The distance from the measuring surface (road surface or any level surface) to the measuring point must be 543 +/- 20mm at the rear axle. At the front axle, the distance must be 611 +/- 20mm". No idea where the measuring point is, the booklet doesn't seem to say.



There's also a way of measuring it using the inclination of the spring brace in the rear. From that info, it looks like US M030 cars were delivered at the same height as the US coupe/cabrio, wheras RoW M030 cars came 20mm lower. In any event, I think the standard ride height is just a starting point...

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[SILVY968]

The 25 inch mid wheel lip measure is what we have been using on the 968's for stock. Sounds like a good place to start.

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[333pg333]

I would imagine Bob/Flash will be on to some of your questions soon. He must be away I think. Anyway he'll give you lots of good info or suggest that search is your friend. What makes you think your car is set too low? If the rear torsions have been re-indexed lower and you're thinking of updating your suspension, I would think you should leave it as it is for the moment as they will most likely make your car sit higher anyway which may turn out to be fine if you see what I mean? <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />

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[KMR968Turbo]

It's only the front that I think might be too low. The front tires hit the fender liner when I go over bumps or corner too aggressively. I have new torsion bars and springs to put in and at that time I will set the ride height.

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[flash]

sorry - i've been moving to a new house and my time here is very limited - i'll be back up and running in full in the next day or so



on the subject of ride height, it is fairly subjective and largely determined by how you will drive the car and what else you do to the suspension



lowering a car certainly lowers the center of gravity, which is generally a good thing - however, it also lowers the roll center in the geometry, which can be a very bad thing if it goes below ground - also, lowering adds load to the pivot points of the suspension, so weak components can fail - this is further complicated by larger (and also heavier) wheels and tires



as for how low to go, many of us are running at about 25" to the top of the wheel arch - this has not shown to have any ill effects thus far - some are a touch below, some a touch above - corner balancing is certainly the best way to determine where to land - when doing it, as well as the alignment, make sure that your weight is in the driver seat, you have about a half tank of gas, and the car is loaded in its nominal condition



as for alignment specs, there is a thread here on that, with different setups for different needs



hope that helps

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[doster]

I went out and measered mine snd got 25 3/4 ds and 24 3/4 ps.



my car is non mo30 and stock as far as I can tell. the rear is about the same

about an inch off. The front hight is not adjustable so I suspect the RR is low

making the FL high. any ideas! <img src="/forum/images/smilies/968/wink.gif" class="smilie" alt="" />

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[333pg333]

[quote name='KMR968Turbo' post='28096' date='Nov 19 2006, 10:34 AM']It's only the front that I think might be too low. The front tires hit the fender liner when I go over bumps or corner too aggressively. I have new torsion bars and springs to put in and at that time I will set the ride height.[/quote]

I would also be careful if changing your torsion bars as only a few mm larger will have a large effect on the cars dynamics. If they're not matched for your front setup it could unbalance the car when driving hard. Big understeer if they become to stiff compared to the front.

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[flash]

um, that would be oversteer if they become stiffer than the front, but yes, i also recommend changing both ends in unison



what is the car to be used for?

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