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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jul-19-2016, 04:49:38 PM   #21
CrookedCommie
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

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Originally Posted by m3elmo View Post
Thanks for that. I'm running the dinan front bar bar at medium stiffness/stock rear bar and the front shocks at 6 from soft and rears 2 from soft so if anything I had it setup to under steer but the car actually didn't under steer all day, it would tend to want to break the rear loose (as seen in video). I'm inclined to think alignment and also your comment about camber in rear matching up to camber in front. I have the Dinan plate in front but stock-ish camber out back.
You can try setting the bar to full stiff in the front, and for rear camber if you don't have adjustable camber arms you may try setting it to max, around -2, I believe. If the Dinan shocks are Koni Yellow derivatives you may only be changing rebound speed so you'll need to consider how that plays into weight transfer.
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Old Tue, Jul-19-2016, 05:35:06 PM   #22
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

Well, he was a little slow catching it, but major kudos for continuing to think when it was backwards.

If the car is sloppy and oversteery, I'd be inclined to look at all the rear suspension bushings. How much mileage on those? Sloppy rear subframe bushings give massive toe change under load.

Also, I have Dinan springs on my car, and while they are decent for street use, they aren't really right for the track. You might consider swapping the rear springs to something stiffer for track use.
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Old Tue, Jul-19-2016, 05:36:14 PM   #23
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

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How is anyone going to blame the car here? Unwind the wheel as you put your foot in it, track out, and let the car go where it wants to go - it's physics. There's a reason for all that track on the right side of the exit before the left side pinches off 100 yards ahead.
Agreed, he wasn't using nearly as much track as he could've been. Also a bit slow/not enough angle on the counter steering. But I'm sure op knows that (I realize it was your friend driving).

I probably can't help you with your setup op, if you have fresh rtabs, but I'm sure alignment and bar adjustment can help you change the balance of the car a bit. With a 265 PSS in the front though, you can't be too surprised the car will oversteer. I've been running square 245s recently and I swear the thing will slide out just from turning in a bit more forcefully than normal.
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Old Tue, Jul-19-2016, 07:22:22 PM   #24
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

PSS's are horrible if they are too worn or too old.

I've just recently got into the E46 M3 world and took my car out on track for the first time. I had some track wheels that I purchased with the car, but wanted to try the street tires first. I've done a lot of track driving, but admittedly in a FF car, so I was being extra cautious. The car was virtually undrivable on the PSS's. I changed to the track wheels (square with NT-01's) and it was night and day. Much better balance.

If your tires are old or worn, I'd think that is the issue.
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Old Tue, Jul-19-2016, 07:49:09 PM   #25
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

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Originally Posted by nrubenstein View Post
Well, he was a little slow catching it, but major kudos for continuing to think when it was backwards.

If the car is sloppy and oversteery, I'd be inclined to look at all the rear suspension bushings. How much mileage on those? Sloppy rear subframe bushings give massive toe change under load.

Also, I have Dinan springs on my car, and while they are decent for street use, they aren't really right for the track. You might consider swapping the rear springs to something stiffer for track use.
I just had new OEM subframe bushings put in while doing the subframe reinforcement less than 1K miles ago. All rear bushings were checked/inspected at time and were deemed good. Agree Dinan Springs arne't the best. I have the JRZ (fresh rebuild) shocks on there and am considering going a ground control coilover conversation with these shocks.

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PSS's are horrible if they are too worn or too old.
....
If your tires are old or worn, I'd think that is the issue.
The tires themselves are pretty new actually - less than 1 year old with production dates in the mid 2015 range. I think they were just getting greasy. from two sessions with a 20min break in between.
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Old Tue, Jul-19-2016, 08:45:47 PM   #26
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

Coming out of the turn there's a noticeable dip between the downhill section and the straight drag strip section (maybe even a change in asphalt type). I've noticed it really unsettles the car there if I try to accelerate out before that dip. You can tell that's where your friend lost it.
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Old Tue, Jul-19-2016, 08:59:24 PM   #27
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

What is your rear toe setting?
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Old Wed, Jul-20-2016, 12:09:16 AM   #28
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

need to invest in a good custom diff
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Old Wed, Jul-20-2016, 03:11:22 AM   #29
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

RCAB's

and a bad spot in tracks fault
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Old Wed, Jul-20-2016, 05:32:41 PM   #30
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Default Re: Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside

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What is your rear toe setting?
need to do an alignment - at current dont' know.
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Discussing Another Trackday - Really Loose Rear End - Spun at Carousel - Video Inside in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)