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Originally Posted by Suberman
How much weight are we to add to improve traction? 200 lbs?
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As I noted above, 100 lb. ~4% more drive, so naturally 200 lb. should give ~8%.
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A simple and effective test is to find a steep snowy hill and see if weight makes any difference to whether you can get going from a standing start or not. All of my cars can on this particular hill, with snow tires and no weight. Except the BRZ. All of the cars brake equally well going down the same hill. Two are fwd with significant front weight bias but of course this is countered by the uphill.
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Not so much. A 12% grade would move the c.g. aft about 2.4% for a car with a 20" c.g. height, a 60/40 fwd car becomes 57.6/42.4, still putting a fair amount more on its drive wheels vs. the 54/46 BRZ which improves to ~51.8/47.2 (accounting for its low 18" c.g. height). Even accounting for the hill, still a whopping 22% advantage to the fwd car.
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One is awd. I also drove a rwd version of the same awd car on the same hill in similar conditions. Weight distribution was similar to the BRZ. Performance was superior to the BRZ.
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What car? Anyway, if its c.g. is higher than the BRZ's (likely the case) it would have a *very* slight advantage from that going up the hill, but shouldn't be enough to notice.
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Weight over the axle isn't the issue. I'm not sure exactly what the issue is but I suspect a 4:1 Torsen just isn't very effective in severe winter conditions.
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Low percentage weight on the drive wheels is certainly *part* of any drive traction problems you're having.
I don't think the torsen should be a problem in the snow (never has been for me in either of my Torsen-equipped FR cars), particularly in a straight line.
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I can't imagine suspension geometry is the issue.
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No, me neither.
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It is a fact, easily demonstrated, that the BRZ is no good as a winter daily driver.
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Hmm, this guy seems to love it...
http://www.ft86club.com/forums/showthread.php?t=54213
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Originally Posted by Rosso_Corsa
The FT86 is my perfect winter car. Rear wheel drive, limited slip differential, manual, and a chassis tuned to go sideways. With a set of Michelin X-Ice snow tires, it's an absolute hooligan in the snow. Here's a little winter hoonage filmed in super slow motion @ 240fps!
Hope you're having just as much fun with your 86s this winter!
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