I am posting this for Greg.

"We are having problems keeping our R180 differentials cool during races.

Has anyone used a pump system with a cooler before? If so, let me know what type of pump to use and an approximate cooler size.

Thanks in advance for all input."

Greg Ira"

FWIW, Greg ran the national at Heartland Park Topeka as a tuneup for the Runoffs to be held there Oct. 9-15. First time he has seen the track. He set a new E Production track record in the race but pulled in not to overheat the diff.

I quess the first question I would ask is.....is a differential cooler allowed in his class? IIRC, there was a good write up by someone on HyrbridZ about this subject. I may be worth looking into.

Tom

I am sure Greg has checked into the SCCA rules about it.

I've run the following pump and a small Mocal cooler.

http://store.summitracing.com/partdetail.asp?part=til-40-524

I plumbed the -6 return line into the top of the diff so it dumped right where the R&P meet. The scavange line was plumbed into a male -6 AN fitting welded to the drain opening on the rear diff cover.

BTW... these pumps last about a season and need a 30 amp fuse.

Here's that Hybrid Z thread: http://forums.hybridz.org/showthread.php?t=110246

I like the placement for the return as the front pinion bearing (the ball bearing just inside the pinon seal) is the one that tends to fail on the R200's anyway, but I do think it's serious overkill for a track day car.

My location for the return was based on my own "monkey-see-monkey-do" engineering from a picture of an old BRE car. Maybe it wasn't the best spot but seemed to worked fine. Also, use the R180 diff cover gasket from the front diff off a 720 4x4 pickup. It has an extra tab that shields the vent from fluid splash.

The Factory race prep manual for the S30-series Z carried information on their recommended diff cooler setup. See scan below.

Parts were sold to the general public through the Nissan Sports Option catalogues. See scan below.

In Works rally cars, the pumps were most often mounted inside one of the 'tool bins' behind the seats.

The diff coolers sold in the Sports Option catalogues measured 70mm x 200mm x 40mm, and the pumps were rated at 5 litres per minute.

Alan T.

I realize this is a bit late, but I was searching HybridZ a little while ago to see if anyone had to use a cooler for the R200 in road racing. Anyways, katman posted a lengthy reply about the R180 which was very informative, last post:

http://forums.hybridz.org/showthread.php?t=98130&highlight=parking

Thanks guys for the help.