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FC rear camber gain

Old 08-09-05, 09:52 PM
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FC rear camber gain

I was wondering if anyone has ever actually ploted rear camber gain as the suspension goes into compression. My main concern is with excessive camber gain as the car squats in a drag racing set-up. I have video tapes of my car during a launch at the drag strip and the rear squats substantially.

Current setup consists of stock springs and Tokico adjustable struts with the fronts on full soft and rear on full firm during racing. Bogart wheels and MT drag radial tires in the rear.

Thanks,
Andrew
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Old 08-10-05, 07:40 AM
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I've been meaning to measure everything and put it into SolidWorks (3-D CAD program), but haven't gotten around to it yet.... Heck I just transfered the title yesterday and I've owned the car for 3 years.
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Old 08-11-05, 09:08 PM
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Anyone? Its hard to imagine that noone has actually measured this. Any guesses? 1 degree per inch of travel? 1/2 degree? more? less?

Andrew
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Old 08-12-05, 12:23 PM
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Originally Posted by andrewb70
Anyone? Its hard to imagine that noone has actually measured this. Any guesses? 1 degree per inch of travel? 1/2 degree? more? less?

Andrew
For a rough answer, you can measure the camber, lower the car in 1/4 increments, and get the rough gain. You can grease the shock piston just before running to see how much squat you are getting on launch. If I were drag racing an FC, I'd make friends with crispeed, and get that sort of data via the friendship . Carl
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Old 08-14-05, 09:21 PM
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Thanks for the help. I was trying to avoid going through the process of taking the measurements. It's a little surprising that noone has done this before.

Andrew
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Old 08-14-05, 10:21 PM
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i don't think many people in this section are drag racers, but the information is beneficial to all racers so who knows. How about some 2-piece uprights?
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Old 08-15-05, 08:22 PM
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What would a 2-piece upright do for you?

Andrew
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Old 08-16-05, 06:47 PM
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do a search for michelin formula one two peice uprights.
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Old 08-16-05, 07:16 PM
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Uprights? The rear suspension is a semi trailing arm multi-link thingie, not double a-arm like F1 cars.
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Old 08-16-05, 08:59 PM
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i know that, but that's the only way to eliminate camber gain on acceleration and still handle well
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Old 08-17-05, 10:55 AM
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What about anti-squat?
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Old 08-17-05, 11:12 AM
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Then you eliminate weight transfer needed for additional traction when launching.
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Old 08-17-05, 11:16 AM
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No you don't. Weight transfer is unaffected.
The only things involved with weight transfer are CG height and wheelbase (or track width for lateral transfer).
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Old 08-18-05, 11:52 PM
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Yeah it's a common misconception that weight transfer is related to the amount that a car dips or sways during acceleration. The stiffness of your suspension does absolutely nothing in regards to weight transfer.
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Old 08-19-05, 01:53 PM
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You two are correct, sorry for the misinfo.

fwiw, Longitudinal Load Transfer = Acceleraction(g) x [(Weight x CG Height) / Wheelbase]
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