Stewart Development Re-valved NA Bilsteins Revised - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

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Old 10-29-2010, 08:30 PM   #21
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Originally Posted by JasonC SBB View Post
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.
Thank's Jason. That's the correct way to do it but it means effort taken from a different problem. What do you think about the very conservative assumption that at maximum lateral acceleration all of the vehicle weight is on the outer two wheels.

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?
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Old 10-29-2010, 09:54 PM   #22
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Thank's Jason. That's the correct way to do it but it means effort taken from a different problem. What do you think about the very conservative assumption that at maximum lateral acceleration all of the vehicle weight is on the outer two wheels.
I think it will take 3+ G's to do that.

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Yeah, I know; it's wildly conservative - but it sure simplifies the calculations
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.

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Better yet, do you happen to have a decent estimate of those locations for a "stock" Miata?
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.
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Old 10-30-2010, 12:24 AM   #23
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Originally Posted by JasonC SBB View Post
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.
Thanks again, Jason.

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 11:40 AM. Reason: Got off my lazy ass and did what Jason suggested.
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Old 12-24-2010, 10:05 PM   #24
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So Bernie is the guy for revalve of OE Bilsteins now. Sounds like that is a good thing. I want HD's for the 01, but may need to go with a good OE pull and some Bernie magic. How much is the revalve from Bernie, I didn't see a web page link.
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Old 12-24-2010, 11:14 PM   #25
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$100 each and he revalves crimp tops as well.
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Old 01-04-2011, 11:37 PM   #26
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Not to bad, I'm looking at a new set of HD's, but will jump on a set of OE Billies if the opportunity is there when I have the funds. I could drive them to Bernie's and save the shipping. Always looking for a good excuse to search for twisty roads, even with blown Showas.
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Old 01-05-2011, 12:05 AM   #27
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$100 each and he revalves crimp tops as well.
call him up, our forum may still be getting the special rate
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Old 05-03-2011, 06:59 PM   #28
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All orders are processed through John at weekend-racer.com now. He handles all the customer service aspects for Bernie. The website also lists the prices and packages avaliable.
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