Ducman82

So after adding the later model S4 AC condenser it just looked funny without the Trans cooler above it. and no that i have a cooler, it needs to cool something. So this week I'm headed down to Marks to pick up some stock auto trans cooler lines to add to my 81. BUT, now i need to figure out what pump to use, how to trigger it, and where to add the in/out ports to a early trans.

im think of a temp sender/controller for the pump (i can't find one thats constant use).

anyone ever done this? I'm sure some people have for race cars.. i would be interested to hear from ya.

Wisconsin Joe

To be honest, I think it would be a waste of time, money and energy.

The manual trans doesn't generate much temp at all.

In a senseless act of butchery, a prior PO (not the guy I got it from) cut out the clock surround. Presumably for a stereo accessory of some sort. When I got it, I just had two gaping holes there. A stereo head unit filled the upper hole (where it's supposed to go), but replacing the console 'face' and getting a clock was not practical (doggoned clocks are out of my reach).

So I decided to put a couple gauges in there, just to fill the space. Oil temp & trans temp. The oil temp is nice to have, in part because my pod coolant temp gauge only works when it wants to. I found that even at extended runs near 90, the oil temp barely tops 200.

However, the 400 degree trans temp gauge never goes above 200. Hardly ever hits 175. I know an auto trans develops a lot of heat, but it seems that a manual just doesn't.

The gauges still look good in the space, but the trans temp gauge is not really needed.

Ducman82

true. that was another question is what people see for temps. but then again, even the later manual cars have a cooler added. figure porsche did it for a reason.

i would be using stock lines and fittings so no butchering really. just aftermarket pump and lines added to the drain plugs.

BC

My only thought would be that making the OEM lines do what you want with them after about midway in the car would be a waste of time - maybe put fittings on there and go AN line after that.

Ducman82

ya, thats what i plan to do. after the rear seat area. gregs going to make me a nice set... once i figure out the rest.

tmpusfugit

Ducman, I added a transmission cooler to another car, a 550 Spyder replica a few years ago. On extended runs at speed the transmission would get very hot, never did figure out why other than I was running quite a bit of HP through a fairly highly geared R&P. Anyhow, I bought a geared pump, it was expensive, like $275 just for the pump, it moves about 2 gallons a minute. The transmission had both a drain plug and a fill plug, I drilled and tapped both for small AN fittings, put a coarse in line filter in front of the pump, ran lines to the cooler up front. I never measured the difference in temps, but it shifted smooth after long high speed runs after fitting the cooler, and the transmission stayed cool enough I could lay my hand on it after a run. I took it out of the car when I removed the big engine, no longer needed with a much lower HP engine.

Wisconsin Joe

I didn't mean to imply that what you are doing would be "butchery".

Just what the PPO did to the dash in mine.

Ducman82

LOL. i got ya. i have worked on some 928's where the PO should be dragged in to the street and shot.... like using ROMEX to fix wiring issues.

SwayBar

Agreed, if it stays on the street. My '87 manual-trans temp typically runs at 140-150 degrees, and if we're out driving hard, it'll go to 175-180 degrees.

On the other hand, a 928 track car, especially at a fast track like Road America where the car hits 150 mph going into Turn 1, Turn 5, and Canada Corner, definitely needs a manual-trans cooler.