Suspension Set Up 91 Mustang

wolfe67

wolfe67

Active Member
Aug 3, 2014
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#1
Just wonder if anybody has this similar setup. Currently have upr kmember with 14 inch 150 springs with strange single adjustable struts
Rear I have viking double adj. Shocks Along with team z anti roll team z upper strip series stock springs. Trying to get my 60 ft better.
Best pass before trying this new set up was 10 .51 @ 128 1.47 60ft.
So my question is any suggestions on what numbers to set fronts at an what to set compression at an rebound. I was gona start at 6 on the front an 3 on rear compression an 14 on rebond. Also have pinion angle set at -2 degrees..
 

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#4
Trans is a c4 supercomp no transbrake .28x10.5 x15mickeythompson slicks.
430 gears. Battery is located to trunk sway bar is off,have the heavy duty torque boxes . Only thing I dont have is adjustable lower control arms. I have the uppers which are team z strip series with solid spherical bushings.....
Wud like to dig deeper with learning more about where my center of gravity is, percentage of rise instant center all that stuff that I dont know nothing about an if itwill even help improve my 60ft.
Thanks for the replies. Any other advice or maybe im just shootin for the moon, my goal was getting low 1.4 60fts
 
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#6
I got the weight of the car down to 2955 with me in it. I got an extra 60 lbs out of the car by scraping the entire floor front to back. I dont no what you wana call that hard tar like material used for road noise. Im surprised on how much that stuff adds up.was debating on removing the heater box an defrost blower fan an all that good stuff under dash. But its kinda a trade off on doing that I still drive car once in a while to a local car show . So its kinda nice nowing I still have defrost just incase...

Anybody have the rear fiberglass hatch? Was wondering how well they fit
 
#7
You are going to have to take some measurements and do the math to find out what the instant center is. Without that information, any adjustments are a real crapshoot. Also a video of the car launching would help determine what direction to go. How much rear tire pressure are you running? What is the weight percentages front to back?
My friends 93' vert @ 3340lbs on only a 26X8.5 tire has gone a best of 1.29 60'. But we could not have got there without knowing all of the other stuff first and taking video of the car launching and watching in slow motion to know what the car is doing.
 
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#8
Bullimtt347 said:
You are going to have to take some measurements and do the math Getting th, instant center,
Bullitt347 said:
You are going to have to take some measurements and do the math to find out what the instant center is. Without that information, any adjustments are a real crapshoot. Also a video of the car launching would help determine what direction to go. How much rear tire pressure are you running? What is the weight percentages front to back?
My friends 93' vert @ 3340lbs on only a 26X8.5 tire has gone a best of 1.29 60'. But we could not have got there without knowing all of the other stuff first and taking video of the car launching and watching in slow motion to know what the car is doing.
Click to expand...
Im running 12.5 lbs of air in my slicks. Not sure what the weight ratio is from front to rear. I bin doing some research on IC ,PR an center of gravity but its not sinking in.If I draw the imaginary line from my upper control arms an my lowers an where they wud cross seems pretty far front on my car. but im lost after I do that, not sure where to go from their. I usually do all my on work to my car but I think imgona end up taking it to a chassie dyno tunning shop an have them set it up. I have my front struts set at 7 an my rear compression is set at 3 ,, rebound I have set at 14 thats within the range factory specs recommend setting at for dragracing, but im still not where I shud be.
Click to expand...
 
#9
The instant center is way to far forward. A few ways to adjust this is (1) to raise the nose of the car. (2) is to lower the attaching point at the rear diff of the lower control arms. I don't know how much is too much or too little air pressure for your application on that size tire, but we run 14 psi on the 26X8.5 Hoosier that we run. Again a video of the rear of the car on launch would really help see what is happening and make adjustments from there. You want the rear of the car to raise up on launch. If the rear of the car raises, then it is pushing the rear tires into the ground. If the rear of the car squats on launch, then the car is trying to pull the tires off the ground and up into the chassis. Initially full loose on front struts, on the rear as a baseline, loose on extension and tighter on compression. Without seeing the car launch, I can only guess if this would work for you.
 
#13
#15
Sharad said:
You absolutely need some good lower control arms. I'd love to see some video of the car leaving.

I suspect your issue is far less about instant center and far more about the torque converter, but we'll see.
Click to expand...
Im Just curious....do you work for upr ?
I ordered a bunch of supension parts late one sunday nite an kinda think I was talking to you. Not really going anywhere with that, I was just curious if I was on thephone with you.
 
#16
Fiberglass hood and hatch with lexan windows will help a lot. I would not recommend fiberglass doors since you do drive it on the street. Not enough weight savings for the money on fiberglass fenders IMHO. However, I saved a TON of weight taking the doors from my race car, gutting them, putting a permanent lexan window in and an aluminum door panel. I would go ahead and get the lower control arms too. Something else to maybe look at: http://www.wildridesracecars.com/product/new-upper-lower-s-box-combo-package/
 
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#17
Yea that thought crossed my mind. I have transmission specialties 10" xhd 3600 stall.
I can only hold the car around 2500rpms before it starts pushing my car forward.
Im gona do some test n tuning down at maplegrove this coming weekend. American Muscle is having their event their this year.
I was talking to frank that works for team Z motorsports an he was saying I shud really cut one coil off the stock springs, again conversation came back to this instant center.
I dont no...I bin racing mustangs since 1994 an never worried about IC but I ran stk shift up until a year ago so I never had 60ft issues.
I know this is a never ending topic with so many variables, i'll just keep messin with it till I get it dialed in. Thanks for all the feed back
 
#19
wolfe67 said:
Im Just curious....do you work for upr ?
I ordered a bunch of supension parts late one sunday nite an kinda think I was talking to you. Not really going anywhere with that, I was just curious if I was on thephone with you.
Click to expand...

Yes, I work for UPR. No I don't think IC is as some people make it sound. One of my customers has been 1.10 60-foot time on 275s with bolt on UPR suspension, not the relocation stuff which some companies sell.

And I don't recommend rear coilovers on a fox unless it's being mini-tubbed. I have an adjustable rear spring kit which doesn't sacrifice tire clearance like the stock location coilovers do, and it's better than hacking your existing springs.
 
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