Typical rear differential temperatures

[HemiHawk]

One thing you could look into is a new diff cover. I replaced my stocker with the finned cover from the Boss 302/GT500. Does it help? I'm not sure but I would guess as its on those cars and many heavy duty trucks (high temps for towing).

A friend of mine with an E46 M3 (a good bit less powerful than your M3) has a VAC diff cover.

Something like this
https://store.vacmotorsports.com/vac-finned-differential-cover-bmw-e82e87e90e92e93-p2493.aspx

 

[bdcardinal]

Originally Posted By: HemiHawk
One thing you could look into is a new diff cover. I replaced my stocker with the finned cover from the Boss 302/GT500. Does it help? I'm not sure but I would guess as its on those cars and many heavy duty trucks (high temps for towing).

A friend of mine with an E46 M3 (a good bit less powerful than your M3) has a VAC diff cover.

Something like this
https://store.vacmotorsports.com/vac-finned-differential-cover-bmw-e82e87e90e92e93-p2493.aspx


I wish Ford Racing/Ford Performance had offered the GT500 Track Pack diff cooler as an add-on part. I checked out piecing one together but it quickly passed what I was willing to pay. The Track Pack cars came with the cooler cover and painted housings so I didn't need to do that to my housing.

 

[Jeff_in_VABch]

If you are going to run extended distance at the 180 to 200 MPH range I would go with a pump and heat exchanger system. It would be a bummer for the diff bearing to fail at 200.

All the GM ultra performance cars have had them for about the last 10 years. Even my Caddy has one.

 

[SteveSRT8]

So true. Little known factoid there^^^


http://i115.photobucket.com/albums/n293/melaniemalone/Ron/100_8586.jpg

Here's a pic of what I bought for my car. the part comes from an E55 which shares the rear end design with my car.

 

[Jeff_in_VABch]

Originally Posted By: SteveSRT8
So true. Little known factoid there^^^


http://i115.photobucket.com/albums/n293/melaniemalone/Ron/100_8586.jpg

Here's a pic of what I bought for my car. the part comes from an E55 which shares the rear end design with my car.


Wow, that's nice!

Lesson learned. There is a high tech cooler for all the cars that might run sustained high speed.

 

[SteveSRT8]

Originally Posted By: Jeff_in_VABch
Originally Posted By: SteveSRT8
So true. Little known factoid there^^^


http://i115.photobucket.com/albums/n293/melaniemalone/Ron/100_8586.jpg

Here's a pic of what I bought for my car. the part comes from an E55 which shares the rear end design with my car.


Wow, that's nice!

Lesson learned. There is a high tech cooler for all the cars that might run sustained high speed.


Indeed there seems to be. The manufacturers may understand this issue!