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      05-30-2009, 05:41 AM   #1
Gearhead999s
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Diff Overheating at the track.

Anybody else having a issue at the track with the diff overheating and making noise?If I run for about 15 minutes the diff gets very noisy when turning and also induces some understeer like the LSD plates are not unlocking on turn in like a locked diff will do.Once it cools off it works fine till it heats back up.The diff oil was changed to the so called improved stuff to try to take care of this issue.
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      05-30-2009, 01:17 PM   #2
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When you say it gets noisy, what kind of noise do you mean exactly? It must be pretty loud if you can hear with a helmet and windows down. I haven't experienced anything unusual of that sort.
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      05-30-2009, 02:44 PM   #3
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Clunk-clunk and the frequency changes in direct relationship to the wheelspeed and yes you can hear it with helmets on.No vibration and the only performance difference that the diff seems to be more locked up on the overrun which causes some turn in understeer.Once it is cooled down no noise and car turns in better.
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      05-30-2009, 08:53 PM   #4
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Quote:
Originally Posted by Gearhead999s View Post
Clunk-clunk and the frequency changes in direct relationship to the wheelspeed and yes you can hear it with helmets on.No vibration and the only performance difference that the diff seems to be more locked up on the overrun which causes some turn in understeer.Once it is cooled down no noise and car turns in better.
Based on your description, I can say for sure that I did not experience this. I wonder how you'd go about replicating it for the dealer so that they fix it? I hope they resolve it soon. Good luck.
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      05-31-2009, 01:09 AM   #5
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Based on your description, I can say for sure that I did not experience this. I wonder how you'd go about replicating it for the dealer so that they fix it? I hope they resolve it soon. Good luck.
Yeah I know!I wonder if the very good looking PR manager from the dealership will be of any use in solving this.She was in the car Friday but of course it was not doing it as the track was still wetI hate sorting stuff out like this and it starts to remind me of all the great fun we had with Ford 8.8's 20 odd years ago when competing in Solo 1.It was not a problem to reshim or change clutchs between run groups.
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      05-31-2009, 10:14 PM   #6
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I have not noticed any noise, but it vibrates (like a little bit of wheel hop) when hot and WOT in 3rd gear just about at track out.
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      06-01-2009, 05:32 PM   #7
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No noise for me.
The problem is, how do you tell the dealer when you hear the noise? "Well, I was at the track and the diff starts making a lot of noise after 15 minutes on the track..."
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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      06-01-2009, 05:54 PM   #8
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No noise for me.
The problem is, how do you tell the dealer when you hear the noise? "Well, I was at the track and the diff starts making a lot of noise after 15 minutes on the track..."
After 10-15 minutes of hard "canyon" driving?
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      06-01-2009, 07:33 PM   #9
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I am now starting remember why my E30 race car had a Torsen diff in it.We had huge issues with heat with the stock LSD to the point that it melted the speed pickup and leaked all the oil out during a race in 30c+ weather.The Torsen was trouble free and we ran that for 4 seasons with no maintence at all and with that it allways put the power down wet or dry.
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      06-01-2009, 08:35 PM   #10
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Try using higher gearing, stay away from redline... its easier on the car and just as much fun.
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      06-01-2009, 08:37 PM   #11
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Quote:
Originally Posted by Gearhead999s View Post
I am now starting remember why my E30 race car had a Torsen diff in it.We had huge issues with heat with the stock LSD to the point that it melted the speed pickup and leaked all the oil out during a race in 30c+ weather.The Torsen was trouble free and we ran that for 4 seasons with no maintence at all and with that it allways put the power down wet or dry.
Was that E30 an M3 or not?
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      06-01-2009, 09:07 PM   #12
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Couple issues with Torsen diffs on the track.

1) It works under power differently than off power
- When you use your throttle to steer, or lift a little in a corner, the car could get a little unsettled as the torque redistributes. (Though it does adjust much faster than a viscous or clutch based LSD)

2) Requires both wheels to have traction
- stiffly sprung race car can easily lift a wheel at apex as you run over bumps/curb, making it hard to put power down.

They work great as a center diff or a front diff where it's more open-like behavior is critical for control.
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      06-01-2009, 09:40 PM   #13
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Was that E30 an M3 or not?
E30 325is
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      06-01-2009, 09:46 PM   #14
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Quote:
Originally Posted by jml View Post
Couple issues with Torsen diffs on the track.

1) It works under power differently than off power
- When you use your throttle to steer, or lift a little in a corner, the car could get a little unsettled as the torque redistributes. (Though it does adjust much faster than a viscous or clutch based LSD)

2) Requires both wheels to have traction
- stiffly sprung race car can easily lift a wheel at apex as you run over bumps/curb, making it hard to put power down.

They work great as a center diff or a front diff where it's more open-like behavior is critical for control.
Now I am not sure that it was a torsen,but it was a geared type diff rather than a clutch based unit.It would transfer power with one wheel in the ground as we discovered when a codriver backed it into the wall and we had to move it around on a jack using its power.Maybe it was a Quafe?It was 19 years ago so it is a little foggy.
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      06-02-2009, 02:34 PM   #15
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maybe its overfilled?
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