Stewart Development Re-valved NA Bilsteins – Revised
#21
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The moment from lateral acceleration doesn't all act on the springs and sways. Some of the forces go through the A arms and not the springs/sways. i.e. its moment arm isn't from the CG to the ground, it's from the CG to the roll center (smaller). The more the car is lowered, the greater this moment arm is.
Yeah, I know; it's wildly conservative - but it sure simplifies the calculations because I don't have to know where the roll center or the center of gravity is on a Miata. Better yet, do you happen to have a decent estimate of those locations for a "stock" Miata?
#22
Yeah, I know; it's wildly conservative - but it sure simplifies the calculations
Ideally you'll want to be just at bumpstop contact or in its soft portion during the highest steady state cornering.
Better yet, do you happen to have a decent estimate of those locations for a "stock" Miata?
For a street car with soft-ish suspension (compared to the manly rates the track studs here run on their track cars), you will always be in the bumpstops during hard cornering.
#23
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I think it will take 3+ G's to do that.
It's too far out to be useful.
Ideally you'll want to be just at bumpstop contact or in its soft portion during the highest steady state cornering.
No numbers sorry.
For a street car with soft-ish suspension (compared to the manly rates the track studs here run on their track cars), you will always be in the bumpstops during hard cornering.
It's too far out to be useful.
Ideally you'll want to be just at bumpstop contact or in its soft portion during the highest steady state cornering.
No numbers sorry.
For a street car with soft-ish suspension (compared to the manly rates the track studs here run on their track cars), you will always be in the bumpstops during hard cornering.
I recall that those numbers have been brought up before on other threads, and the calculation only requires a really simple force/moment diagram. I just need to get over my laziness and do a bit of searching. Lately my time's been taken up researching Locost 7's and other similar projects. Too many interests, too little time.
EDIT: I did a bit of searching last evening and came across a free download of chapter 7 (Handling Theory) of Keith Tanner's new book, "How to Build A High Performance Miata". The process of calculating load transfer is all laid out for you, along with an estimate of the center of gravity (~17"). I could assume the roll center is at the ground surface (conservative), but I'd like to refine it a bit so I'll keep looking. Thanks again, Jason.
Jim
Last edited by Thucydides; 10-30-2010 at 10:40 AM. Reason: Got off my lazy ass and did what Jason suggested.
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