UPR COIL OVER KIT

[sgt.scared]

on my 1991 mustang gt 5.0 what spring rate[UPR COIL OVER KIT] should I use on my front in ????
10'' - 375 lbs
12'' - 250
12'' - 350
14'' - 130
14'' - 150
14'' - 175
O it has been lower with Eibach Pro-Kit Springs..Estimated Drop: Front - 1.5”, Rear - 1.0” some time my tires rub while turning in a curb at speed. and i would like to change my center of gravity for better launches. most of the time my car is a daily driver but i do play at the track too.
Come on guys , What should I get ???

 

[281pony]

what kind of shocks/struts do you have? cc plates? how much does your car weigh? how comfortable of a ride do you want? need more info to get any kind of educated answer.

 

[sgt.scared]

dont really know about the struts but on the rear is KYB GR2 SHOCK and I have BBK cc plates and it weighs about 3100. I drive around more than I rase at the track.

 

[281pony]

if you want a car to unload hard and drive decent, i would use a taller softer spring. i ran 14 130's in my notch. it weighs around 2800 without driver, it would be a little too soft for your car i think.

14" 150 or 14" 175

 

[90stang5speed]

I had the 14" 150's but, after my last round of weight reduction, the car sat to high in the front & i was out of adjustment to bring it down. my cars weight was 2760 with 1/2 tank of fuel & me in it. Im going to give a set of 14" 95 lb springs a try. I know that will be real slopy on the street though.

 

[sgt.scared]

i was told today that if i ran iron heads to use 250 and if i ran Aluminum heads to use 175 ? what u think about this and the height ???

 

[90stang5speed]

when I had the 14" 150's, I had the stock heads on it. I put some AFR 185's and dropped even more weight so thats why im going togo to the 95's. My first set of springs were 12" 200 granatelli's that's what they consider their "drag" kit". They didnt give me enough travel so I switched to the 14" 150's. at that time my car was over 2900 lbs. so I would say go with the 150's until you drop more weight.

 

[281pony]

whoever told you to change spring rates that drastically is an idiot imo. i run a 175 lb spring in a 2860 lb car that does everything well.

it rides acceptable, handles amazing, launches great. since your after more of a drag only setup, i'd go for the 150 i suggested.

coilover spring rates can affect ride quality drastically. don't go over 175 if you want any sort of a decent ride quality. i noticed a huge difference from 130 to 175.

 

[srtthis]

i have 14-175's on my hatch and i believe the coupe is a 12-150

 

[90lxcoupe]

a 14" spring is too long, it will bind up and actually rub against the coilover sleeve, 12" is the way to go and the rate is going to depend on how heavy the front end is.

Im switching from 14"-175# to 12"-150# after alot of reading about front springs on street/strip cars.

Also, team Z motorsports has alot more usable spring choices than what you listed in the original post

 

[sgt.scared]

the front end is factroy / but it does have the lowerd springs on it.

 

[sgt.scared]

o i running factroy sturts on the front .

 

[srtthis]

90lx... is that issue with 14" springs with the slip over sleeves or with a threaded body like a qa1

 

[90stang5speed]

I have the slip on sleeve coilovers. I did have a bit of an issue with the spring rubbing the sleeve with my 14" 150's but, I think that was partly because the adjusting nuts were all the way at the botom. If they were not, I dont think it would have been as much of a problem. Guess I will find out when I put the new ones on.

 

[2000xp8]

I think you need to really re-evaluate what you have going on.

First off, with factory front struts you are wasting your time buying any springs at all.
Second, your rear tries rub in the corners not because the car is lowered but because the rear moves, two options get a more narrow tire or a panhard bar.

Next you have the fact that coil overs do not last as long as factory style springs, they are puny and you will likely wear them out if you daily drive on them.

You say you corner hard, well any soft spring is going to make a mess out of that.

IMO, run a stiff spring for good handling on the street, then use adjustable shocks to help you at the track.
If you are hell bent on coil overs (which honestly doesn't sound like you are ready for yet), i'd go with like a 250-12.

The smart move would be to buy yourself good front struts first, then see how you like your current lowering springs.

 

[90lxcoupe]

I have the slip on sleeve coilovers. I did have a bit of an issue with the spring rubbing the sleeve with my 14" 150's but, I think that was partly because the adjusting nuts were all the way at the botom. If they were not, I dont think it would have been as much of a problem. Guess I will find out when I put the new ones on.

This happened to me also, it is because the spring is too long and binding up on the top of the sleeve

 

[sgt.scared]

my rear tires dont rub... its my front tires that rub the fenders in a hard corner

 

[bentley429isBAC]

a 14" spring is too long, it will bind up and actually rub against the coilover sleeve, 12" is the way to go and the rate is going to depend on how heavy the front end is.

Im switching from 14"-175# to 12"-150# after alot of reading about front springs on street/strip cars.

Also, team Z motorsports has alot more usable spring choices than what you listed in the original post

This^

 

[93RedGT]

I am havering a similar issue with my 93. I just did sportlines with ups cc plates and strange 10 ways and a bump steer kit up front/ and sportlines totiko blues, ups upper and lower control arms out back. I am having issues with it rubbing only on the driver side after it all settled the driver side was lower by about a 1/4" so I put a spacer in and got it level and add a little negitve camber on the alignment maching reset toes and all it's better than it was but still rubbing. So I'm thinking I will have to go coil overs as well. My car is iron gt40 headed 331 with bumper support,Foglights and bracket delete and fiberglass hood, I'm 260lbs any suggestions on springs for a coilover, car see track but am wanting it to ride decent
Thanks for any help

 

[91TwighlightGT]

I think you need to really re-evaluate what you have going on.

First off, with factory front struts you are wasting your time buying any springs at all.
Second, your rear tries rub in the corners not because the car is lowered but because the rear moves, two options get a more narrow tire or a panhard bar.

Next you have the fact that coil overs do not last as long as factory style springs, they are puny and you will likely wear them out if you daily drive on them.

You say you corner hard, well any soft spring is going to make a mess out of that.

IMO, run a stiff spring for good handling on the street, then use adjustable shocks to help you at the track.
If you are hell bent on coil overs (which honestly doesn't sound like you are ready for yet), i'd go with like a 250-12.

The smart move would be to buy yourself good front struts first, then see how you like your current lowering springs.

This is the first time I have ever seen someone say that you would wear out a coilover spring driving it around town. Source?