Understeer.com Fan Delete Kit

[KenC]

Will the fan delete kit on understeer.com work for an e30 M42?

http://www.understeer.com/onlinestore-engine.shtml

[stevofthahill]

I would like to know this as well :)

[nando]

all that is is an E36 M42 temp switch, an 80C t-stat and a couple bottles of water wetter + their cap thingy (which is bling-bling I guess but uneccesary). But assuming the 92+ 318 thermostat works in your car everything else is the same.

[guibo09]

shouldnt you use a 75C thermostat? if your fan comes on at the same temp as your thermometer opens, then it will be on every time.

[nando]

shouldnt you use a 75C thermostat? if your fan comes on at the same temp as your thermometer opens, then it will be on every time.

this may seem obvious, but the thermoswitch is in the radiator, the thermostat in your engine. The two can have very different temps, usually the radiator is much cooler.

it isn't neccesarily better to run a cooler t-stat either. You can actually overheat faster with a cooler t-stat than a hotter one.

[guibo09]

this may seem obvious, but the thermoswitch is in the radiator, the thermostat in your engine. The two can have very different temps, usually the radiator is much cooler.

it isn't neccesarily better to run a cooler t-stat either. You can actually overheat faster with a cooler t-stat than a hotter one.

i think i get what your saying. since we dont have much choise for the thermoswitch temperature, what thermostat temp do you recommend with a 80C thermoswitch?

i think you also mentioned that shorting the thermoswitch to run full speed at the lower temp trigger was recommended.

[nando]

i think i get what your saying. since we dont have much choise for the thermoswitch temperature, what thermostat temp do you recommend with a 80C thermoswitch?

i think you also mentioned that shorting the thermoswitch to run full speed at the lower temp trigger was recommended.

80c is fine for most climates.

yeah, all you really need to do is connect both ground pins on the thermoswitch to the ground on the high speed circuit. then it will always come on at high speed.

[Liam]

75c is way too cold and even 80c is too cold for the M42 everything else is designed to run at 88c. At 75c there will be all manner of problems (cylinder rinsing, sludge the list goes on).

There is no really good "off the shelf" work around for the fan, gotta make it your self.

[gearheadE30]

I run the thermoswitch from a 318ti; dunno if it is different from other e36s or not. My thermostat is 88c. I have both speeds hooked up; I don't really want it on high speed when I'm just using the AC and such, and Indy doesn't get that hot. High speed also puts a huge strain on the alternator compared to low speed, which just saps horsepower more than anything else.

[KenC]

So I should stick with the 88 instead of using the 80?

Why do most places recommend the 80 degree one for M42s and M5X engines?

[Liam]

So I should stick with the 88 instead of using the 80?

Why do most places recommend the 80 degree one for M42s and M5X engines?

I would stick to 88c, like I said everything in the system is engineered to operate at that temp.

BMW engineers are a little crazy but I generally don't try to out think them on most issues (this being one of them).

[KenC]

I installed the lower temp thermoswitch a week ago and added a bottle of water wetter.

I haven't had a hint of overheating even with extended periods of idling. We'll see how it goes once the weather gets into the 80s regularly.

[dude8383]

I installed the lower temp thermoswitch a week ago and added a bottle of water wetter.

I haven't had a hint of overheating even with extended periods of idling. We'll see how it goes once the weather gets into the 80s regularly.

For some reason I can't get my high speed fan to stay on...can't figure it out because the bentley is for 325i!