Trans temp when dyno tuning

[HKusp]

Again, I would agree with you if you're doing a WOT pull THROUGH THE GEARS. But if you're just on the dyno and run it at low rpm from 1 up to 7 and lock the converter for the WOT rip, at that point, fluid temp has very little to do with anything.

I'd honestly be MUCH more worried about doing a WOT rip on a cold engine where the pistons and rings aren't fully expanded and the oil is thick and not flowing as well and the pressure is high enough to worry about bypass condition.

Why wouldn't the same caution about things not being to temp apply to the transmission, even if the converter is locked up? Fluid still is being pumped through all tge components of the transmission and while it is thick and cold the orifices in valve bodies, clutch packs, tubing, etc. all have certain clearances and tolerances. I would think running the fluid up to temp in the trans would be a benefit no matter if the converter is locked or not.

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[DougS550]

It's about viscosity and clearances. Fluids are generally spec'd for piece of equipment based on clearances and viscosity at operating temperature. When you operate them at other temps, they are not as efficient. Clutchpacks are very sensitive to viscosity, and as things get more complex then that logic applies even more.

Sure with modern technology things like engines and transmissions can operate smoothly right after starting them, but that doesn't mean they are at their optimal point. Fluids are thicker when cold, but generally clearances remain the same throughout.

As are you. When MOST people dyno the car, they force the coverter to lock. Which means the fluid temps have nothing to do with it anymore. Running the car hard otherwise on a cold trans, I agree, but once you lock it, it's a non issue. And virtually no one dynos the car without the converter locked. Changing into 1:1 gear at room temp isn't going to hurt the transmission one bit.

I think You answered OP question on running on a Dyno. On the street I think everyone agrees its best to get not only the engine, but transmission warmed up as best as possible. I say as best as possible for sometimes after my

Why wouldn't the same caution about things not being to temp apply to the transmission, even if the converter is locked up? Fluid still is being pumped through all tge components of the transmission and while it is thick and cold the orifices in valve bodies, clutch packs, tubing, etc. all have certain clearances and tolerances. I would think running the fluid up to temp in the trans would be a benefit no matter if the converter is locked or not.

For me, I would never run any car hard or most important, a Dyno run without my Engine and Transmission being warmed up. BUT, realistically Your cars engine and transmission will already be warm due to driving to dyno unless you Trailor your car in. Everyone can do as they feel fit and just let "R" Ride.