# Overheating at the Track **URL:** \ **Category:** SON240sx Automotive\ **Created:** [August 24, 2009, 5:54pm UTC](https://forums.speedlife.net/t/overheating-at-the-track/127438 "2009-08-24T17:54:32Z")\ **Posts on this page:** 1\ **Showing post:** 19
**Author:** ![Careless](https://avatars.discourse-cdn.com/v4/letter/c/3e96dc/32.png) [@Careless](https://forums.speedlife.net/u/Careless)\ **Post date:** [September 14, 2009, 11:39am UTC](https://forums.speedlife.net/t/overheating-at-the-track/127438/19 "2009-09-14T11:39:45Z")
I chose the Kouki Z31 because I like the look and the 80’s raw feel that the Z31’s have over the 240sx’s, the immense torque I’ve got from the vg33 (and I’m currently at 0psi for break-in, too!), and because I just think it’s a cooler car over all. The fan setup I have uses two 70amp relays in a home electrical box that is hidden beside the radiator, behind my oil catch can, which is a stainless thermos. LOL. You would never know, and the engine detail takes away attention from that area anyway. Not sure what the term “swithc ballin’” means… ? As for the fan datum, thanks for that. I think my next purchase will be the larger Mark VIII fans. Which cars use the RF123 motors on their fan assemblies? > [@thank you microsoft](https://forums.speedlife.net/t/thank-you-microsoft/23937/22): > > Mark VIII (P# RF123) fans do not have the same motor as the Taurus 3.8 fans, and they have 18" blades compared to 17". Output is said to be 3000+ CFM on low and up to 4900 on high 🆒 > > Similar RF125 fans use a Lincoln motor on a taurus 17" fan, which still gives good CFM, but not RF123 output. RF24 and taurus fan’s are the ford motor on the 17" blades which put out something like you said 2500 low and 3900 high. > > Maximum draw on startup for either is still under 45 amps I believe, with average high draw of 30-35 for the bigger RF125 motor, 25-30 for the RF123. > > Sounds like you have a solid setup though, I’m overbuilding the hell out of mine, but yours is more than enough - is the Z31 switch ballin’ or why did you choose it? --- _[View the full topic](https://forums.speedlife.net/t/overheating-at-the-track/127438)._