Loss in acceleration + throttle response ??

juld0zer

I finally got Uprev to try out this fan control mod.

I honestly cannot say it lived up to my expectations because it actually made things worse for me. Yes it kept the oil temps cooler/kept the oil temp at normal temps for longer, but by cranking on the fans, you're flooding the engine bay with hot air which heats up the intake piping and the MAF/IAT sensor. It creates heatsoak - or a false high intake air temp, leading to timing being pulled and creating another lag effect.

I originally set my fans to come on at 90*c (65% duty) but i did not see much drop in coolant temps. I suspect this could be due to the thermostat but i thought it opened at a lower temp..
The coolant temp does reach 90*c at most stop lights so the heatsoaking was getting really annoying since i had spent so much time/money researching and eliminating heatsoak. It was a step backward to go a step forward.
I now have my fans set to come on at 95*c (65% duty). I will only reach 95*c at the longer stop lights and in heavy traffic which is probably only 20% of the time. I can live with that.

The other upside of the slightly higher on-temperature is that when the fans come on, the coolant temp DOES drop 4-5*c within a 10 seconds.

I do have to note though, those with uninsulated intakes or stock intakes might have a different experience to me so don't take my feedback as negative - it's all relative to how your car is setup.