Aero and Suspension Tuning With True Type Coilovers

Brendan · 07-05-2019, 08:32 AM

With a true type rear suspension, it makes the motion ratio very close to 1 to 1. If you ran a 750lb/13k rear with the divorced set-up, that would put you at a natural frequency of about 2.00 hertz. If you were to then run that same spring with a true type rear, that bumps things up to over 3.00 hertz. Based on my calculator, you would need to go back down to 7-5k or 400lb to 300lb spring range if you wanted the rear to feel the same as when you were running the divorced set-up with 13k/750lb springs. I don't know how aero effects this as I have been focused on autocross, but I imagine you need to run on the stiffer end of the range since you have a force pushing down on the car.

I would love to see what he comes up with. Have my math checked so to speak.

Hotrodz · 07-05-2019, 09:01 AM

Quote:

Originally Posted by Brendan

With a true type rear suspension, it makes the motion ratio very close to 1 to 1. If you ran a 750lb/13k rear with the divorced set-up, that would put you at a natural frequency of about 2.00 hertz. If you were to then run that same spring with a true type rear, that bumps things up to over 3.00 hertz. Based on my calculator, you would need to go back down to 7-5k or 400lb to 300lb spring range if you wanted the rear to feel the same as when you were running the divorced set-up with 13k/750lb springs. I don't know how aero effects this as I have been focused on autocross, but I imagine you need to run on the stiffer end of the range since you have a force pushing down on the car.

I would love to see what he comes up with. Have my math checked so to speak.

Thanks you input as my friend as there is a lot experience on here singularly and collectively. I want to respect Dan's consulting and so I will let you know what he provides me given our agreement once I give him all the data he has requested. I will tell you this! Your calculations are totally in line with his rough estimate..."Quick math is lettings me like if you have 14k front springs, you need to be around 5-6k in the rear."

Cheers!

07-05-2019, 08:32 AM	#1 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 646 Drives: Poor man's Porsche Rep Power: 544	With a true type rear suspension, it makes the motion ratio very close to 1 to 1. If you ran a 750lb/13k rear with the divorced set-up, that would put you at a natural frequency of about 2.00 hertz. If you were to then run that same spring with a true type rear, that bumps things up to over 3.00 hertz. Based on my calculator, you would need to go back down to 7-5k or 400lb to 300lb spring range if you wanted the rear to feel the same as when you were running the divorced set-up with 13k/750lb springs. I don't know how aero effects this as I have been focused on autocross, but I imagine you need to run on the stiffer end of the range since you have a force pushing down on the car. I would love to see what he comes up with. Have my math checked so to speak. SS_Firehawk, Rusty and Hotrodz like this.

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