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Spring rates for track racing
Topic Started: Wed Feb 22, 2012 12:06 am (1,772 Views)
markhope39
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My car hits the track in March for the start of testing and among the many areas we have yet to figure out are spring rates.

As any of you who've set a race car up will have experienced, it can take ages and lots of attempts to get the right spring rates without a tried and tested starting point.

So cutting to the chase, does anyone know what spring rates work on a 190e Cosworth?
I read that someone has gine with 300lb F&R. And I've read of rates as low as 250lb.

Your help is appreciated.
Edited by markhope39, Wed Feb 22, 2012 12:07 am.
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HRH-squidlips-III
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pm mazza he,s the bloke in the know when it comes to this sort of stuff
i think hes doing something similar at the mo
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85matt190
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the rates for a stripped, caged 190 will be alot different than stock..
I cant help you much as of yet... I'm running 400e springs for the time being, but once my car is done being stripped and the cage is in, with the fuel cell etc, I will be putting it on a 4-post tie down rig to help determine good spring and swaybar rates...

Would be Interested to see what you come up with though, and what your experience on track tells you..
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JM Motorsport
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I have some expereince with springs rate on track. I take it you run the stock setup with a separate damper unit and spring? Would be nice to know what springs and dampers you are using at the moment

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mazza
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markhope39
Wed Feb 22, 2012 12:06 am
So cutting to the chase, does anyone know what spring rates work on a 190e Cosworth?
I read that someone has gine with 300lb F&R. And I've read of rates as low as 250lb.

Your help is appreciated.
Hi

300lbs/in (52.5N/mm) is approx the spring rate of lowering springs, you are going to need stiffer springs.

The 16v OEM springs are approx 45N/mm or 256lbs/in

dont go stiff crazy with the rears, rear doesnt like it

As per JM Motorsport post...what set up are you running now? have you had your car corner weighed?



mazza
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markhope39
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mazza
Wed Feb 22, 2012 12:09 pm
markhope39
Wed Feb 22, 2012 12:06 am
So cutting to the chase, does anyone know what spring rates work on a 190e Cosworth?
I read that someone has gine with 300lb F&R. And I've read of rates as low as 250lb.

Your help is appreciated.
Hi

300lbs/in (52.5N/mm) is approx the spring rate of lowering springs, you are going to need stiffer springs.

The 16v OEM springs are approx 45N/mm or 256lbs/in

dont go stiff crazy with the rears, rear doesnt like it

As per JM Motorsport post...what set up are you running now? have you had your car corner weighed?



mazza
Thanks for the OEM rates. That's good to know.

I'm starting with the standard set up as coilovers are beyond my budget at the moment.
When I can I'll go for coilovers one the front only.
Currently it is set up as a rally car to run on smooth scandanavian gravel, so I'm guessing it'll be quite stiff which is in the right direction at least.
Once I tested in March I'll test the springs and see what they are.


If I don't get any info from someone who has already raced one, I'm probably going to start off at 6/700lb fronts and and maybe only 500lb at the rear and see where I go from there. The hassle with that is going to be re-setting the dampers to match every change.

Cornerweighting will be somewhere at the end of my list. I'll wait until I get a feel for how I like the car to handle first. Like a lot of drivers it's rare that it'll be even.
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1morebenz
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markhope39
Wed Feb 22, 2012 9:46 pm
mazza
Wed Feb 22, 2012 12:09 pm
markhope39
Wed Feb 22, 2012 12:06 am
So cutting to the chase, does anyone know what spring rates work on a 190e Cosworth?
I read that someone has gine with 300lb F&R. And I've read of rates as low as 250lb.

Your help is appreciated.
Hi

300lbs/in (52.5N/mm) is approx the spring rate of lowering springs, you are going to need stiffer springs.

The 16v OEM springs are approx 45N/mm or 256lbs/in

dont go stiff crazy with the rears, rear doesnt like it

As per JM Motorsport post...what set up are you running now? have you had your car corner weighed?



mazza
Thanks for the OEM rates. That's good to know.

I'm starting with the standard set up as coilovers are beyond my budget at the moment.
When I can I'll go for coilovers one the front only.
Currently it is set up as a rally car to run on smooth scandanavian gravel, so I'm guessing it'll be quite stiff which is in the right direction at least.
Once I tested in March I'll test the springs and see what they are.


If I don't get any info from someone who has already raced one, I'm probably going to start off at 6/700lb fronts and and maybe only 500lb at the rear and see where I go from there. The hassle with that is going to be re-setting the dampers to match every change.

Cornerweighting will be somewhere at the end of my list. I'll wait until I get a feel for how I like the car to handle first. Like a lot of drivers it's rare that it'll be even.
I would recommend doing the cornerweight before changing spring rates, this will drastically change the way the car feels.

I did it on my previous track car after dabbling with the suspension (spring rates), the corner weight did more of a difference then me changing the springs. (all depends how soft or hard your current setup is for you)

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