small SUV/pick up build help
Posted by idan
Godlike Moderator Join Date: 04/01/2015 Posts: 3 |
edward mucklow Godlike Moderator Location: charleston,wv Join Date: 05/31/2011 Age: Possibly Wise Posts: 763 Rally Car: ford mustang LX 5.0, 1973 VW Beetle |
Out of this dumpster fire Mod Moderator Join Date: 08/15/2010 Posts: 1,236 |
If you want the engineering/design theory behind shock selection and dampening, look into Tune to Win and Engineer to Win by Carroll Smith for a very basic and easy to understand suspension theory. If you want more info, and to melt your brain, look into Racecar Vehicle Dynamics or listen to some Claude Rouelle seminars (highly recommended). The FSAE and BajaSAE forums also have some serious knowledge on shocks and vehicle dynamics.
http://books.google.com/books/about/Race_Car_Vehicle_Dynamics.html?id=opgHfQzlnLEC https://vimeo.com/41854831 http://www.carrollsmith.com/books/tune2win.html Then once you have a basic understanding of those concepts and measurement, contact Chris Billings at The Shock Shop and try to pick his brain. He's usually friendly... unless you're Robert Gobright 
http://www.shock-shop.com/ |
Mike Davis Elite Moderator Location: St Louis Join Date: 06/09/2014 Posts: 12 Rally Car: Porsche 944 S2 |
Godlike Moderator Join Date: 04/01/2015 Posts: 3 |
John Vanlandingham Professional Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Out of this dumpster fire Mod Moderator Join Date: 08/15/2010 Posts: 1,236 |
Keith Fritzinger Mega Moderator Location: Portland, OR Join Date: 01/20/2011 Age: Midlife Crisis Posts: 53 |
about 15 years ago, Curt LeDuc build a few Sportages for desert use - Darren Skilton and LeDuc both drove them in The Dakar
a quick internet search found some info, might be worth looking a bit harder to see what they did Class 3 for sale or rent
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Godlike Moderator Join Date: 04/01/2015 Posts: 3 |
i read some guides and articles, all was about sports cars, so im not sure if im in the right way...
all started with calculating suspension frequency. so lets start with some numbers: vehicle weight about 1320kg (2910lbs), front 720kg (1588lbs) rear 600kg (1322lbs) the vehicle is a body on frame and have double wishbone at the front and solid axle with LSD at the rear. my vehicle is lifted ~1.5" with springs, the springs are about the same length as stock but a lot stiffer 250lbs/in to 400lbs/in at the front, I bought it like that. I used this page to calculate suspension frequency (ATM front only): http://eibach.com/america/en/motorsport/products/suspension-worksheet hope that I measure right 
d1=26cm (10.23in) d2=38cm (14.96in) so MR = 0.685 ACF= cos 19 degrees = 0.945 so if i calculated right: WR: was 110lbs with stock springs and 177lbs with the spring i have now. suspension frequency: ~1.25HZ stock and ~1.6HZ with the spring i have now. now, how do i know what suspension frequency i should aim to ? |
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