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Axle oil temps...

Dave2013M3

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On the way home today took a canyon home (Topanga) and I noticed my axle temps got to about 190- 200 deg F. Is this normal? I just got 4.09 gears installed, I will ask what diffy fluid he used. He told me but I forgot. I was in 2nd and 3rd the whole way down 12 miles and it was hot today. It hit 87 in the Valley.
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Cory S

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That's well within normal range. Start to be concerned above 250+
 

Biggus Dickus

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On the way home today took a canyon home (Topanga) and I noticed my axle temps got to about 190- 200 deg F. Is this normal? I just got 4.09 gears installed, I will ask what diffy fluid he used. He told me but I forgot. I was in 2nd and 3rd the whole way down 12 miles and it was hot today. It hit 87 in the Valley.
I think the warning light comes on at 270 or 280, so your temps are not an issue. That said, because I do track days, I went with Redline 75-85 and had the exhaust wrapped pretty extensively to keep things cooler. I don't know if 4.09 gears make a diff (PUN intended) and run hotter. I'd think extended time in 2nd and 3rd may have contributed to more heat. But if you were running hard for a long period and only hit 200, I'd feel pretty good.
 
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Dave2013M3

Dave2013M3

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The 4.09 gears do make the oil hotter as they are moving at a faster rate. I never really paid attention to what they were to begin with the OEM Torsen 3.73's. They got stuck at 218 and stuck there.
 

Rapid Red

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Normal, and it's the way the tailpipe wraps around the carrier.
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Paul McWhiskey

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What brand of wrap is that Rapid Red?
 

Rapid Red

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