Clunk in All4 rear end and run-flats

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Old Oct 15, 2012 | 10:53 AM
  #26  
bmwr606's Avatar
bmwr606
6th Gear
Joined: Feb 2012
Posts: 2,264
Likes: 31
From: wisconsin, usa
Originally Posted by DR61
I agree; I ran a practice autocross in my All4 a few months ago and was occasionally able to get the rear wheels loose (with all traction aids off). I used 40 psi front, 34 rear as a start. Probably will up the fronts to 43 the next time I try it. Also may try 52 psi rear; that sometimes helps with some tires. I have the 17" Conti all-season with Sport Suspension.

I also need to get used to the slight turbo lag when getting on the gas mid-corner, something I'm not used to coming from an R53. Probably I need to get the throttle down a bit earlier than in the R53. Still I surprised a few STR Miatas I was running with...
right foot to the floor and left foot for the brakes ... keeps the turbo spooled up

i first learned about left foot braking in 1976 when i took a road rally driving school in a Saab turbo to learn how to drive my 1976 rabbit, my first FWD car

i kept ending up going backwards on the inside of corners in the rabbit ... FWD is very different than RWD ... the road rally school taught me how to drive FWD fast and loose and introduced me to the term "off throttle oversteer"

also excess speed and a brisk flick of the steering wheel helps get you sideways ... corner entry speed is higher than your brain thinks is possible

i suggest a parking lot for practice area or a track with a lot runoff and no traffic nearby, i have spun my cms all4 several times, no wonder my tires are 1/2 gone at 5,000 miles, though i did not expect much wear from a tire with a 260 treadwear rating

overinflating the rear tires does make the rear slide easier, but tread wear becomes an issue so i don't do it for street driving, i stay at 42f/36r

scott
 
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