Ride height differences - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 11-03-2015 Thread Starter
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Ride height differences

It seems that one of the more common complaints/comments Mustang owners have regarding the SN 197 series has to do with ride height. Most seem to think that it sits too high and that the corresponding gap between the top of the tires and the fender lip is too great. For some it's a functional concern ie. handling, for others it is more about looks or style. I have a '14 base model GT [ manual transmission ] and frankly I have always been satisfied with it. A good friend of mine has a '13 Track Pack GT. He brought it over this weekend so I could do some minor work on it. He mentioned that he was thinking about lowering his car and it was then that I noticed that his car sat noticeably higher than mine. I bought my car new and he bought his with less than 5,000 miles on it. Neither car has been modified. We both have the same size tires, 255x40x19. He has his original Track Pack wheels and I have a set of Boss 302 [ 19x9 ] wheels so no difference there. I measured the ride height of both cars from the jacking point pinch welds front and rear to the concrete garage floor. Now my garage floor isn't a race shop surface plate, but it is pretty level so the measurements should be fairly accurate. His car was just over an inch higher in front and about 3/4 inch higher in the rear than mine. My car has 1/4 inch rake from front to rear. Anyone have any thoughts about this? My understanding is that Track Pack cars have spring rates about 10% higher than standard GTs, but spring rate dosen't necessarily affect ride height. The combination of the springs free height, it's rate and the weight of the car will determine ride height. If anything my car should weigh less than his, since being a base model it has fewer options. For the record it weighs 3580 with a half tank of gas. This weight was taken on a certified grain scale accurate to the nearest 20 lbs. Your thoughts or comments are appreciated.

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post #2 of 6 (permalink) Old 11-03-2015
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The track pack does have a tuned suspension from my understanding. I'm not clear on everything that is different but there is a chance he has stiffer springs and bushings from the factory. Stiffer springs will settle less. Also what is the mileage on both cars currently. This could affect it since they might not be completely settled yet.


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post #3 of 6 (permalink) Old 11-04-2015 Thread Starter
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Thanks for your input. Unfortunately I doubt that that's the reason for the height difference. Every good spring manufacturer knows how to make a spring stiffer without changing ride height. If you shorten the free length, but increase the diameter of the wire slightly the spring will be stiffer, but the static ride height will remain the same. In fact most of the lowering springs on the market will not only lower the ride height, but will also increase the spring rate. I need to examine more unmodified cars to determine which of our cars is most typical. I know that I would be reluctant to lower mine any further since I live in a rural area where the roads aren't always the smoothest. Some railroad crossings can be pretty harsh too.
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post #4 of 6 (permalink) Old 11-04-2015
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Ok. My point here is that the track pack springs are a tighter spring. Yours are the soft mushy base springs. Which are likely to settle more than a stiffer spring. Add to that that the track packs have many bushings that are stiffer which will also support some of the weight more than the base suspension bushings it makes sense that your car sets lower than his at this point. Supposedly the shocks and struts are valves differently as well. Plus if you have more miles than him add that to the equation. All of this adds up to more suspension movement on your car which means more wear in on the components which can mean more settling of the suspension.

https://www.allfordmustangs.com/forums/mustang-s197-sale-classifieds/973497-factory-gt-flowmaster-axle-back.html#post8825354
Stock 2016 EB
2013 GT Deep Impact Blue W/ Brembos
FRPP GT500 axle back, MGW race spec, Koni yellows, Eibach Pro Kit, GC camber plates, BMR LCA & relocation brackets, MRR-M350 19X10 Piano Black Wheels.
2014 Smart for Two.
1996 Mitsubishi Eclipse GSX. More mods than I can remember.
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post #5 of 6 (permalink) Old 11-22-2015
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they werent made to be the same ride height. Also the boss wheels should be 19x9 and 19x9.5 with the 19x9.5 having 285/35 tires which are shorter than 255/40

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post #6 of 6 (permalink) Old 11-23-2015
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Quote:
Originally Posted by Blackpenguin69 View Post
Also the boss wheels should be 19x9 and 19x9.5 with the 19x9.5 having 285/35 tires which are shorter than 255/40
By .1" if you are talking about .1" difference between ride height that can be the difference between worn suspension / tires versus newer tires and suspension.


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