We used the 20W Schaeffers Hydraulic Fluid with John Deere spec and others but it would not hold high gear shift, just too slippery I guess. Went with BTE and no issue. I would think heavier fluid would show you the right path. Good luck, hope to see you this summer!!
Jok

quote:

I would think heavier fluid would show you the right path.

An honest question. Since oils thin with heat, what it the potential impact on consistency as heat builds and the fluid thins?

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Originally posted by Canted Valve:

quote:

I would think heavier fluid would show you the right path.

An honest question. Since oils thin with heat, what it the potential impact on consistency as heat builds and the fluid thins?

That is a good question and very reason we try to get our fluids up to working temperature and run coolers to keep them from going over desired temperatures. We try to eliminate that variable as much as possible.

We keep an eye on trans temp. Is the thought that higher viscosity fluids change viscosity more than lower viscosity fluids with temperature increase?

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Originally posted by Bucky:
We keep an eye on trans temp. Is the thought that higher viscosity fluids change viscosity more than lower viscosity fluids with temperature increase?

This was another reason I went to the lightweight fluid. I did the research on viscosity at different temps and although I dont recall the numbers, the lightweight had a lot tighter window between 100 and 200 degrees than the thicker fluids. I couldnt build enough trans heat early in the day to duplicate the heat of later rounds.

Good to know thank you!

Just a thought here, if the fluid temperature is critical / important in your application.

Since many guys use oil pan heaters to get the oil temperature up, why not use a trans pan heater. That would get the fluid temperature up to the level you need. It might make the first time run match the temperature of later rounds/runs.

OR

Meziere make a transmission pan that uses engine water to heat the trans fluid.

For years our sons qualified their Late Model Circle Track car they heated the engine oil but cooled the water, it made the car faster.

Bob

Great idea. I may send it in for mechanical tightening if the fluid change works. I saw some AW100 on the shelf today. Could be interesting.

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Originally posted by RPROGAS:
Just a thought here, if the fluid temperature is critical / important in your application.

Since many guys use oil pan heaters to get the oil temperature up, why not use a trans pan heater. That would get the fluid temperature up to the level you need. It might make the first time run match the temperature of later rounds/runs.

OR

Meziere make a transmission pan that uses engine water to heat the trans fluid.

For years our sons qualified their Late Model Circle Track car they heated the engine oil but cooled the water, it made the car faster.

Bob

When I built my Front Engine Dragster I ordered the radiator with the Transmission cooler in it for that very reason. My thinking there was that it would help get transmission up to temp faster and allow me to have more control over that temp. In the end I decided not to.

On my new Altered I am building I am using a Deraile transmission Thermostat. (Thanks Banjo) It goes in line with the cooler and returns most of the fluid back to the pan until it reaches temp and then it sends it all through the cooler. My hope is to get the transmission temp up to operating temp faster and keep it in the range I want it. I will be monitoring the pan temp on this car so will know more after I start running the car.

Consistency is one of the things we are all after and fluids do change viscosity as it changes in temps. If we can narrow that temperature window some it may help our consistency and one more variable reduced.

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Originally posted by Brian Guthrie:
ATI Makes a 30W trans fluid you could try.

Really works well! They have a 10, 20 and 30, typical F Type is 20wt.