ubercooper

this is turning into a mess lol

If the 928 bible says its an M24 I wont change the order and hope for the best

ahh the trans code is G28/11 so it apparently is an 85/86... guess I'd be alright anyway.

Hilton

Well that was an adventure.. always fun going somewhere "new" on a 928. Handily I've done this before on a few 928's.

Years of grime cleaned off the back panel, followed by a blowtorch on the fill plug for a minute, followed by some penetrating oil. Then careful wiggling of a breaker bar until it cracked (on a "tighter" wiggle - a good sign as it means it was likely not over-torqued), and it came out like a charm.

The 10mm hex-tool ones are indeed M22 - so I had it the wrong way round.

I'm guessing they changed the fill plug for '86 model year - along with the change to the gearbox centering spring (centering in the 2/3 plane). Certainly 87-onwards use the M22 plugs.

dprantl

When changing the transmission fluid in my former US '86 (early), I had to use the 17mm hex tool.

Dan
'91 928GT S/C 475hp/460lb.ft

BC

I think I recall seeing my 86.5 have a smaller Hex input.

ubercooper

Almost all the parts (except the 2 M24 fittings) are here. I can put together a parts list pretty quickly if anyone is interested. The pump will be mounted behind the drivers seat and the cooler will probably go on the side of the battery box. I'll post some more pics of the finished product when the other fittings come in.

Speedtoys

There are better coolers out there...cant find a good Setrab cooler?

The 119FP has a nice integrated fan as well..for non direct airflow installs.

ubercooper

B&M has a very solid reputation, especially for the price

Why bother with a fan which adds weight and requires more draw from the battery when you can just put it where the air can cool it?

Also I'd rather not have anything in the cockpit which could potentially turn into a projectile waffle iron in the case of wreck.

Speedtoys

Ya..they work ok.

But flow rates, pressure drop, and efficiency are considerations.


Trying to work out..how mounted to the side of the battery box, carries good airflow. Cooling is proportional to airflow by mass and velocity. (??) Something like that.

Used the 119FP in the trans am...keeps the 1995 original OEM tranny cool and happy pushing about 725Hp at the crank. We pull down a ton of heat across it.

Also..even in direct airflow, which under a car isnt..the fan will keep chillin the HW for you instead of just heat soaking the cooler.

Glenn Evans

The 17mm mentioned is across the flats of the Allen key, not the diameter of the plugs. The specified diameter of the drain plugs for all the transmissions from 78 to 89 (my WSM and Tech specs books don't cover post 89) is M24 x 1.5.

Hilton

Glenn, on my 87 the plug is M22 - presumably also on my 89 as both use a 10mm allen key to undo the plug.

ubercooper

Since Im running dual side pipes under the drivers door, there are no obstacles left to block potential airflow to the cooler. My theory was since the bottom of the car is flat and the cooler would be in the first recessed area, it would create a vacuum effect/ lower pressure zone and pull the heat out from under the car. However its just a theory and could be complete crap as well.

Im not 100% set on the idea and do have enough line to mount it up front to increase efficiency

+700hp trans am sounds pretty bonkers. That 6.6 (6.7 now) is pretty much the same motor Im running in the hybird... minus a blower I presume.

Glenn Evans

I checked the PET, and it shows that a 22mm sealing washer was used with the transmission plugs starting in 1987 (doesn't bother to give the size of the plugs, though). The Tech specs book doesn't mention that the plugs changed and, as far as I can see, neither does the workshop manual.

As they say, it pays to check the Rennlist first! :-)