Evaluating Chassis Stiffness, any ideas? |
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Evaluating Chassis Stiffness, any ideas? |
McMark |
Jan 26 2007, 03:08 PM
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#1
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I've been thinking about this for a long time. I would like to be able to quantitatively evaluate chassis stiffness. I have some ideas for increasing stiffness, but I'd like to be able to measure those changes by something other than the seat of my pants ("It feels stiffer.").
My best idea so far is to place a car on three jack stands of equal height and measure the droop of the fourth corner. Any other ideas? Any physicists that can help out here? |
IronHillRestorations |
Jan 26 2007, 06:26 PM
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#2
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I. I. R. C. Group: Members Posts: 6,761 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
I saw one of the '97 GT1 tubs on a chassis dyno at Weissach. It was a special fixture made into the floor of the race shop and had what I'd guess to be 6" I beams about 15' long, spaced about 1" apart. There was probably 12 or 14 of them. They had the tub fastened to this and about 30 dial indicators and holders all over the tub. They used hydraulics to put force at different places on the tub and then recorded the changes.
When I say chassis dyno, it wasn't to measure horsepower, but the flex of the chassis. I would bet they probably used this fixture to build space frames too. Very cool stuff, once in a lifetime trip. I would say you have to secure the entire chassis, and release a corner or section at a time in order to correctly measure the flex. About six weeks ago I purchased an old Blackhawk frame bench. I plan to replicate the Celette type of fixtures specifically for a 914. |
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