Need help with Spring Rates and set up on my NA Fat Cat suspension
If you're under steering all over the place with 600/400 you're either driving way too deep and making the car understeer with your driving (needs moar drive mod) or you're just all over the front bump stops so your actual spring rate in the front is 2000.
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Junior Member
Joined: Feb 2013
Posts: 68
Total Cats: 6
From: Arvida, Québec, Canada
I'm wondering, though, if one can run 800/500 on non-adjustable revalved shocks.
My interest is that there seems to be a rule opportunity in Chumpcar where this would be possible, it should fit over the 2x rule (so 25pts per corner) but not pay the 75pts per corner of adjustables shocks.
Would a Fat Cat setup then be the way to go for a decent dual duty car between Time Attack and Chump? Is there any other possibilities for revalving them? I've got word of Whitener Racing Shocks.
My interest is that there seems to be a rule opportunity in Chumpcar where this would be possible, it should fit over the 2x rule (so 25pts per corner) but not pay the 75pts per corner of adjustables shocks.
Would a Fat Cat setup then be the way to go for a decent dual duty car between Time Attack and Chump? Is there any other possibilities for revalving them? I've got word of Whitener Racing Shocks.
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Thread Starter
Newb
Joined: Jan 2016
Posts: 16
Total Cats: 0
From: playa vista/los angeles
The fat cat set up uses revalved Bilsteins . They are not adjustable but you have the problem with springs that I have been trying to figure out here- with some great suggestions
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Or shitty m.net alignment
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Junior Member
Joined: Nov 2017
Posts: 47
Total Cats: -18
From: QC, Canada
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You're right reading is hard, you were trying to say because you were on street/DOT tires that the 1000/500 comparison was invalid...... It's not, that is what the fast guys are running and you continue to ignore that fact.
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Junior Member
Joined: Nov 2017
Posts: 47
Total Cats: -18
From: QC, Canada
Is the 800-500 setup now past its fame ? Getting hard to follow
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It is simply the progression of development on the chassis as tire technology improves. As tire grip increases, so must front roll stiffness.
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Junior Member
Joined: Nov 2017
Posts: 47
Total Cats: -18
From: QC, Canada
On a 245/40 RivalS-shod track car with no aero, I would start at 1000/500, yes. It would work at 800/500 as well, but it will go faster with 1000/500. It would be an undriveable mess at 600/400.
It is simply the progression of development on the chassis as tire technology improves. As tire grip increases, so must front roll stiffness.
It is simply the progression of development on the chassis as tire technology improves. As tire grip increases, so must front roll stiffness.
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Senior Member
Joined: Nov 2016
Posts: 697
Total Cats: 91
From: Los Angeles, CA
A fair amount of people running 245s with 1000/500 are pushing stockish power. Cornering grip has nothing to do with engine power.
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Junior Member
Joined: Nov 2017
Posts: 47
Total Cats: -18
From: QC, Canada
If it didnt have anything to do with people would run 275s up, they aren't.
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You cannot use F/R rate ratio to do anything except make yourself look bad, dude. 700/400 and 1100/500 have vastly different ratios but they both work for different reasons. The suspension is different front to rear and the rates reflect that.
We're going to go in circles until you stop posting bad info in the Race Prep section here. With 600/450 and Koni Yellows, no offense, you simply can't comprehend how bad your setup is compared to the average spring/shock package discussed in this section. You don't have the frame of reference to understand the shortcomings in your setup and how to address them.
It's not a knock against you, I'm sure you mean well, but it would be like me walking into a kitchen with professional chefs and telling them how much salt to use. They're going to be polite the first few times, but if I keep doing it they're eventually going to tell me to **** off, and they probably should.
We're going to go in circles until you stop posting bad info in the Race Prep section here. With 600/450 and Koni Yellows, no offense, you simply can't comprehend how bad your setup is compared to the average spring/shock package discussed in this section. You don't have the frame of reference to understand the shortcomings in your setup and how to address them.
It's not a knock against you, I'm sure you mean well, but it would be like me walking into a kitchen with professional chefs and telling them how much salt to use. They're going to be polite the first few times, but if I keep doing it they're eventually going to tell me to **** off, and they probably should.
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We're going to go in circles until you stop posting bad info in the Race Prep section here. With 600/450 and Koni Yellows, no offense, you simply can't comprehend how bad your setup is compared to the average spring/shock package discussed in this section. You don't have the frame of reference to understand the shortcomings in your setup and how to address them.
It's not a knock against you, I'm sure you mean well, but it would be like me walking into a kitchen with professional chefs and telling them how much salt to use. They're going to be polite the first few times, but if I keep doing it they're eventually going to tell me to **** off, and they probably should.
It's not a knock against you, I'm sure you mean well, but it would be like me walking into a kitchen with professional chefs and telling them how much salt to use. They're going to be polite the first few times, but if I keep doing it they're eventually going to tell me to **** off, and they probably should.
The moral of the story for those that surf these forums. We are fortunate enough to have a handful of well accomplished drivers with 1000's of track hours. They openly share and recommend setup info that most other racers would keep close to the vest. It would be wise to follow those recommendations and fine tune from there. It will save you TONS of development time and in some cases you may never get there on your own.
Last edited by k24madness; Nov 29, 2017 at 11:39 AM.
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Thread Starter
Newb
Joined: Jan 2016
Posts: 16
Total Cats: 0
From: playa vista/los angeles
the test
A big thanks for all the suggestions! I left the rear springs at 450 and went to 750 as suggested by Savington. Also moved RB 1.125 sway bar to stiffest setting. What a great change- I was at Willow springs international this past weekend and with worn NT01 cut 4 seconds from my previous best 1:41 to 1:37. I know that s not a great time for the "big boys" but man was that fun!
Thanks again
Thanks again
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