Track Day Devastation
8/21/13, 05:47 PM
#21
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This thread has good info. I just ordered my AST 5200's with 850lb front and 400lb rear springs.
BUT. I run Toyo RS1 competition slicks and a carbon fiber rear wing. This makes a big difference.
Think of it this way...with a stiff suspension there is less body roll and thus more lateral G's are put onto the tires. But also there is more contact patch on all 4 tires and more even weight distribution because of less roll.
Street tires will give up "sooner" under this faster and stronger lateral force....
But if you want a set of new rear Corsa's for your car, I have a stickered pair I'll sell for cheap.
Another thing AST says is that you have to replace all your bushings with this suspension....
BUT. I run Toyo RS1 competition slicks and a carbon fiber rear wing. This makes a big difference.
Think of it this way...with a stiff suspension there is less body roll and thus more lateral G's are put onto the tires. But also there is more contact patch on all 4 tires and more even weight distribution because of less roll.
Street tires will give up "sooner" under this faster and stronger lateral force....
But if you want a set of new rear Corsa's for your car, I have a stickered pair I'll sell for cheap.
Another thing AST says is that you have to replace all your bushings with this suspension....
Last edited by DGRacing; 8/21/13 at 06:35 PM.
8/22/13, 07:13 AM
#22
Our preference is Eibach, but their tolerances are tighter than any other spring manufacturer on the market that we have seen thus far.
8/22/13, 01:29 PM
#23
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[QUOTE=Brandon302;6675155]The competition Mustangs run a smaller or no bar in the rear to increase grip by allowing the back to be as soft as possible, plus with higher spring rates you're probably over stiffening the back with a bar.
QUOTE]
I tried that no rear bar thing for a while and softer springs...this is what happened.
(not my car and not this extreme...but you get the idea)
This isn't really ideal in Auto-X.
On a road course it's probably not an issue as much or at all.
QUOTE]
I tried that no rear bar thing for a while and softer springs...this is what happened.
(not my car and not this extreme...but you get the idea)
This isn't really ideal in Auto-X.
On a road course it's probably not an issue as much or at all.
8/22/13, 01:40 PM
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8/22/13, 06:01 PM
#26
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(not my car and not this extreme...but you get the idea)
This isn't really ideal in Auto-X.
On a road course it's probably not an issue as much or at all.
8/22/13, 10:29 PM
#27
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I'm not *that* superstitious...but I don't think I want the possible convenience of racing near a cemetery.
And I've been following this thread from the start...and had to laugh a little bit at the probable loss of time due to the tires.
I'm sure you'll be going faster once you sort out the suspension...and get some better tires!
Reminds me of that 'max braking performance' thread...tires matter.
And I've been following this thread from the start...and had to laugh a little bit at the probable loss of time due to the tires.
I'm sure you'll be going faster once you sort out the suspension...and get some better tires!Reminds me of that 'max braking performance' thread...tires matter.
8/23/13, 07:08 AM
#28
well the fox body does have 5 struts... 4 on the corners, and the body itself.
On our 05-09 cars we ran no bar if we could, or an 18-19mm if the track was very high speed.
The 10+ cars we usually run a 18mm bar.
On our 05-09 cars we ran no bar if we could, or an 18-19mm if the track was very high speed.
The 10+ cars we usually run a 18mm bar.
8/23/13, 10:28 AM
#29
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Also remember, the Fox body cars (and even SN95) cars had the quadrabind suspension in the rear. The S197 cars do react differently (albeit not crazy different) to suspension changes. I remember running 1100# springs in the front of the 86GT (before I went to coil-overs, griggs, IPS, etc) just to keep the front suspension from working as designed
Picture below should be with Griggs front K-member and adjustable arms. Rear would be an IPS parallel 4-link with a watts-link. Coil-overs at all 4 corners (think it was 500/200) with a 4cyl front bar and no rear bar. Pretty sure I had ABS in the car by this event as well.
Last edited by JScheier; 8/23/13 at 10:33 AM.
8/23/13, 01:20 PM
#30
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Great to see another 4 eye, since I believe I lot of people convert the fronts to run the 87+ head light housings. Was the car still pretty streetable with the 500/200 spring setup?
8/23/13, 07:50 PM
#31
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. Friends at the gas station kept me in inspection stickers.Driving it from Houston to College Station (TAMSCC) for an event... we hit a bump and the spring in the passenger side corbeau inserted itself into my co-driver's leg.
Definitely streetable
Maybe not so much so now that I'm older
Last edited by JScheier; 8/23/13 at 07:51 PM.
8/24/13, 06:31 PM
#34
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On 2012 Boss.
(Shamelessly threadjacking.....sorry!!)
8/26/13, 11:37 AM
#36
Just to clarify, this is Bill (not Dean).
We run around a 600/300 setup and an 18mm rear bar for most courses. On the 05-09 body we ran no rear bar quite often, but the new car likes to have something in there.
The 700/400 still seems very stiff, but it really depends on what the car weighs. All our cars are fully stripped so we're carrying around several hundred pounds less than a stock car.
We run around a 600/300 setup and an 18mm rear bar for most courses. On the 05-09 body we ran no rear bar quite often, but the new car likes to have something in there.
The 700/400 still seems very stiff, but it really depends on what the car weighs. All our cars are fully stripped so we're carrying around several hundred pounds less than a stock car.
8/27/13, 09:13 AM
#37
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On a positive note, the car looks amazing driving around the track....like it's riding on rails. Even the 458 chasing me has more body roll..... 
Last edited by 430 Scud; 8/28/13 at 05:52 AM.
8/27/13, 05:15 PM
#38
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8/27/13, 05:57 PM
#39
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