Rear diff recommended temp
Racer
Joined: Jan 2005
Posts: 347
Likes: 0
From: Somewhere in the Finger Lakes of NY
"Ambient" is the best, actually. Rear end will live forever.
Unfortunately, when you actually use the car, things get hot. You don't want it to get so hot that the oil starts to come apart. Pick your poison - dinosaur or synthetics - but they all start to fail at some temp.
I wouldn't run dino oil over 240deg...and synths over 260 deg.
There is a very popular Japanese-built sportscar that is notorious for rear end problems, due to low volume of oil and low heat-shed of the assembly. In endurance racing, rear end temps have touched 300 deg F. on the outside of the case (saw it myself with a IR heat gun pointed at the pumpkin during a pit stop in a 12 hour race), which raises all sorts of hell with the oil...and seals...and any "locking" product used to hold the R&P together. Yikes...changing rear-ends mid-race sucks, especially when one of them is smokin hot. 28 minutes, stop-to-start, though.
Gear oil smells bad enough. Overheated gear oil stinks all to hell.
Unfortunately, when you actually use the car, things get hot. You don't want it to get so hot that the oil starts to come apart. Pick your poison - dinosaur or synthetics - but they all start to fail at some temp.
I wouldn't run dino oil over 240deg...and synths over 260 deg.
There is a very popular Japanese-built sportscar that is notorious for rear end problems, due to low volume of oil and low heat-shed of the assembly. In endurance racing, rear end temps have touched 300 deg F. on the outside of the case (saw it myself with a IR heat gun pointed at the pumpkin during a pit stop in a 12 hour race), which raises all sorts of hell with the oil...and seals...and any "locking" product used to hold the R&P together. Yikes...changing rear-ends mid-race sucks, especially when one of them is smokin hot. 28 minutes, stop-to-start, though.
Gear oil smells bad enough. Overheated gear oil stinks all to hell.
