Transmission failures!

[WutApex]

While were on the topics of RCRs...thoughts on hood vents to evac some heat?

[Al Fernandez]

6.25 pertains to engine cooling, so 6.25.5 does not apply. Transmission modification allowances are covered in 6.27

[mach1]

6.25 pertains to engine cooling, so 6.25.5 does not apply. Transmission modification allowances are covered in 6.27

A cooler trans would translate to less heat getting to the motor :-D, also since power steering is brought into the subject on 6.25 I figure the trans cooling could be argued.

In spec miata there is a concept of a "weenie protest", a protest for something that doesn't help performance, for example there were guys welding and reinforcing up the diff housings since they frequently broke, they eventually passed a rule for it but no one would really protest because it would be a "weenie protest".

A trans cooler would actually hurt performance because the cooler fluid would be more HP robbing.

[Sook]

A trans cooler would actually hurt performance because the cooler fluid would be more HP robbing.

Open up the restrictor or nitrous jet a bit more. The best part about restricted engines.

- Josh

[mach1]

Open up the restrictor or nitrous jet a bit more. The best part about restricted engines.

- Josh

Hah! What about this, go to the dyno with cold drivetrain, let the motor warm up to 180, make your 3 runs with cold trans/gear oil, done. On track the oil heats up another 75F, 3whp more in racing conditions, trans/diff cooler would help minimize the delta here. No coolers would be a bigger advantage in this example.

[Sook]

Hah! What about this, go to the dyno with cold drivetrain, let the motor warm up to 180, make your 3 runs with cold trans/gear oil, done. On track the oil heats up another 75F, 3whp more in racing conditions, trans/diff cooler would help minimize the delta here. No coolers would be a bigger advantage in this example.

DOOOODE, stop giving away the secrets!

[mach1]

DOOOODE, stop giving away the secrets!

You crazy mustang owners!!!

[RichardP]

Hah! What about this, go to the dyno with cold drivetrain, let the motor warm up to 180, make your 3 runs with cold trans/gear oil, done. On track the oil heats up another 75F, 3whp more in racing conditions, trans/diff cooler would help minimize the delta here. No coolers would be a bigger advantage in this example.

To effectively do this, you have to sit in the car with the clutch pushed in while it's warming up. If it is out of gear with the clutch out, the input shaft of the transmission is spinning. If the input shaft is spinning, the cluster gear is spinning. If the cluster gear is spinning, 1st, 2nd, 3rd, and 5th are spinning. With all those gears spinning in the fluid, the fluid heats up a bit. Not as much as if you are under power, but...


Richard P.

[Al Fernandez]

Oh and I don’t know where I’d stand on what is too high but eager to hear from people smarter than me about what good looks like.