What size trans cooler for hp transmission ?

MilesnMiles · Post by **MilesnMiles** » Thu Apr 07, 16 10:15 am

I currently have a 12 X 4" trans cooler in place. Do I need anything larger?
Rebuilt trans with valve kit and hp parts. New convertor stalls between 2,400-2,700rpm ( not tried out the new unit yet)

I've also fitted a 2" sump pan and filter extension. How much fluid do you reckon on inc the convertor?
Thanks chaps.

MilesnMiles · Post by **MilesnMiles** » Thu Apr 07, 16 10:34 pm

Good grief, is no one running performance parts around here anymore

Pete · Post by **Pete** » Thu Apr 07, 16 11:34 pm

We run one twice the size but we were making twice the horsepower and twice the stall speed

The only way you will know if it works is if you fit a trans temp gauge.

Try it and see how you get on.

Blue · Post by **Blue** » Fri Apr 08, 16 6:38 am

From my experience that cooler will be big enough Miles.

MilesnMiles · Post by **MilesnMiles** » Fri Apr 08, 16 8:26 am

Thanks chaps, getting tetchy in my old age

The rebuilt trans has been sat under my car ready for final fitting but I can't lift it on my own and getting frustrated.
Got a mate coming round tomorrow for the fit.

Blue · Post by **Blue** » Fri Apr 08, 16 9:10 am

Without a temp. gauge it's all a bit of a guess, you want the trans running at about 150 degrees for best operation and longevity, running it stone cold isn't good either. I had to fit a smaller cooler than I would have thought to achieve that on the Dart. Not heat sleeving the cooler pipes when they pass by the exhaust can make a big differance to trans temp.

Pete · Post by **Pete** » Fri Apr 08, 16 9:19 am

If the pipes are too big then the fluid can circulate without dissipating any heat through the cooler and can actually run hotter. Sometimes bigger is not better.

MilesnMiles · Post by **MilesnMiles** » Fri Apr 08, 16 9:45 am

Yes, id read that bore size matters for the return pipes so I'm keeping with stockers. One does run close to the headers so I will re-route or put some heat wrap around that pipe.

Don't think I have an issue as when the trans was stripped down, despite the abuse suffered (sprag shot) the fluid was not looking burnt.

As I understand it fitting improved valve bodies (TF2) actually improves the effectiveness of the fans mission and can reduce heat.

Pete · Post by **Pete** » Fri Apr 08, 16 9:51 am

Fans Mission???

Is that like a Hernia-Glide?

MilesnMiles · Post by **MilesnMiles** » Fri Apr 08, 16 9:54 am

Ta da!

Blue · Post by **Blue** » Fri Apr 08, 16 11:59 am

Yes, the smooth change on an automatic is actually slippage, so a shift kit cuts down on that so should reduce temp a tad and increase friction life.