bebbetufs

I want to install a temp sensor in the transmission case. I'm splitting the case to reseal it, so it may be a good time to drill and tap a 1/8" hole for a sender.

I would like to know if anyone has done soe and if so where you have placed the sender.

67King

I hope to put one in mine on the drain plug, which is how I did the engine. THe trans has a 24mm plug.

bebbetufs

I have considered that, as I too did the engine that way, but because the drain plug is a 20-something socket head it would be impossible, unless someone has made some drain plugs that use a 32 or so mm. external wrench.

Van

17mm hex... I'd find a place on the side to make a sensor location. Doesn't have to be at the bottom - just below the fluid fill level (I'd probably go 1/3 down from between the fill and drain plugs).

Keep in mind that debris is likely to bounce around under there from time-to-time - so make sure any wires are pretty protected.

I put a temp switch on my tranny, but that's a surface mount guy... I put it under one of the upper bolts on the side cover plate (so it's up and out of the way).

I've also put thermometer tape on the tranny - and it gets to about 190 F.

bebbetufs

hmm. I'm just brainstorming here, but what if I locate the temp sensor just below the minimum fill level. That way it could double as a fill level sensor. If it reports temps a lot colder than expected either the sensor has failed or the level is too low. Would probably only work when stationary between sessions though.

HICKS

What's the point of doing this? I understand having it on a truck that tows a lot or even a automatic car, but why on a 944? Are heat related problems common? Does anyone even know what a unsafe temp is in a 944 gearbox? Just curios.

67King

McMaster-Carr part number 9085A319.

67King

Heat related problems are common on any car that sees a track. And the S2 transmission didn't come with an oil cooler. In my case, I'm hoping using Millers NT gear oil will help lower my temps enough to keep me from having to add one.

Van

Can you double check that p/n? It's not coming up as valid on the McMaster website.

FrenchToast

Just a guess, but I would think around 250F is approaching the warning zone for a transmission oil temp.

The heat problems only exist when the transmission is under a lot of stress. On the track does raise the temperature, as 67King says, but doesn't pose a problem unless you're already pushing the limits. Towing, obviously, is another. Or going up a steep incline. Anything where lots of torque is continuously run through it.

The 944 NA trans is good for about 250, the 951-AOR good for 350 to 400. I have read the 944 3-speed auto is good for 800.

The 968 six speed is the strongest of the lineup, not the 951-AOR. The 968 trans is (originally) an Audi trans with the shaft to the rear wheels blocked off. If anyone has driven a six speed Audi (not an R8), its pretty likely its a 968 box.

I think Porsche still holds the record for a production transmission capable of the most power, at 1500 hp. And that was forty years ago!

Keep in mind, all this is what I've been told by various experts. No hard data to display.

Take care!