Ford Mustang Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
1,666 Posts
Discussion Starter #1
I've been researching and tweaking on my 91's suspension in a quest for better and more consistent traction. I have 14"/150 front coilovers, MM caster camber plates. I've been able to remove some weight from the car in order to move it in the form of ballast to the rear of the car. Got it from a 60/40 front back bias to 56/44. Car weighs 3100 race ready with me on board. I've also managed to increase my front end travel from ~2.75" to right at 5".

I've read through the info on "baseline suspensions" website and need some clarification if my instant center has been improved or if I made it worse. When I started the IC was ~45", that was behind my CG and just above the normal line. Ride height was pretty high. By lowering the car, my IC is now ~34", further from the CG, still barely above the normal line.

Should I try it as is, or should I look at raising the IC up and lengthening it?
I'd have to raise the ride height to do so. Also seen reference to "hitting the tires harder or softer" not sure what that means or which I should be trying to accomplish.

Previously on launch (this season), load transfer was minimal and it blew the tires off.

last year the car hooked better on the same tires, but I had stock 5.0 LX springs in the front and overall weight of the car was around 3160. Matter of fact, on launch the rim would spin in the tire about 6". I fixed that problem over the winter.

Track is 1 1/2 hours away, planning on going friday.

Any help? Thoughts?
 

·
Registered
Joined
·
1,666 Posts
Discussion Starter #2
I'm guessing there are no suspension specialists on board?
 

·
Registered
Joined
·
7,030 Posts
With your car I would try to get it closer to 30" about 9" high. Need to wack the tires a little. That long is going to make it very hard for the car to pitch and get up on the tire. Don't forget the front of the car this makes a big difference in the way the car works.
Tim
 

·
Registered
Joined
·
1,666 Posts
Discussion Starter #5
With your car I would try to get it closer to 30" about 9" high. Need to wack the tires a little. That long is going to make it very hard for the car to pitch and get up on the tire. Don't forget the front of the car this makes a big difference in the way the car works.
Tim

So, your saying, when I shortened the IC from 45" to 34" I'm heading in the right direction? The 9" high part, do you mean 9" from the ground for the IC, because that's where it is? My lower control arm is almost perfectly parallel with the ground, that places the IC right at 9" high. Pretty amazing how 1/2" ride height adjustment can really shift the IC. As far as the front end, I'm hoping the fact that I almost doubled my front end travel will dramatically help my situation. I respect your suggestion, from what you've done with your car, it shows you know how to get a car down the track quickly.
 

·
Registered
Joined
·
453 Posts
If I understand correctly, hitting the tires refers to how much power hits the tires and how fast. This can be adjusted by loosening and tightning your shocks and struts. the looser it is the easier it hits the tire because power is used to move the weight of the car. ( weight transfer ) The tighter the suspension the harder it hits the tires because power isnt sucked up by the suspension. You want your set up set as tight as possible and still hook. Otherwise you are waisting power in unwanted weight transfer.
 
1 - 7 of 7 Posts
Top