Mach 1 Track Build & Dark Horse Overheating + Trans Failures – Need Proven Cooling Setup

[Junkyard Dog]

Sorry, this is an S650 thing. see the 7A095B item in the diagram below. It hangs out just under the front area of the transmission. I did not realize it was not on the S550.

So I wonder if an S650 owner can something like you have done and still have a quick warm up from the tranny fluid to coolant heat exchanger. The engine would warm up the transmission. Or would this defeat the purpose?

I don't know if this coolant to fluid heat exchanger shuts off after a certain temperature or whether it just keeps dumping 200°+ temps into the transmission fluid.

View attachment 111090


The 7A095A, in front of the radiator, is the auxiliary transmission fluid cooler on the performance pack and Dark Horse models (inc. the Dark Horse manual transmission models, too, but not the regular GT manual transmission models).

Ok, on the S650, it looks like both the 7A095B and the 7A095A are routed through a thermostatic valve, in the diagram above 7H322.

So, just a guess here, it warms using 7A095B and then switches to cooling with 7A095A or transitions from one to the other based upon temperature. It does not appear that the transmission uses both at once when the transmission is hot.

 

[TeeLew]

The transmissions are pretty durable considering the abuse thrown at them by the drivers. And yes we run the same Motorcraft Mercon LV. People have to remember that GT4 race transmissions at the Pro level are refreshed pretty much every event,

The GT4 is a paddleshift Holinger box, No? That should be a 50 hour box, minimum, if you change the oil between events. The DH is a different story.

 

[Junkyard Dog]

Can anybody confirm the fluid routing? I can't figure it out looking at this parts diagram.

Does anybody know how the transmission fluid flows on the S650, using that parts diagram above? It looks like the thermostat is after the heat exchanger. So is there full time hot coolant heating the fluid, even after the fluid is hot on track for ten minutes?

Or does the transmission bypass the heat exchanger and switch over to the cooler 100% at a certain temperature?

Given this additional heat exchanger part, I wonder whether the fix is very different on the S650 from what @Rodpwnz did to his transmission. For example, is the valve body modification the same?

 

[Junkyard Dog]

Better pic of Davies Craig EWP 150 and a demonstration video. Note: Video appears to contain an older version of the controller.

View attachment 109999

Stupid question, perhaps, but isn't the water flowing backwards in that video from how it should run in the car? Into the upper driver side of the radiator with the hot water from the engine?

He has the pump on the lower hose pumping water into the bottom of the radiator and up out of the top left hand side.