Overheating on track only

[alexk]

I removed the AUX fan and kept the viscus fan.
It's good enough for the non-AC CSL, so it's good enough for my car (I don't run the AC while stopped).

Why are you saying 88C for the thermostat ?
The S54 thermostat is 80C.

I like the electric fan installation.
I will try it on my car too for performance reasons.

Shimmy > the rubber sealing on the top of the bonnet should be sufficient to release the hot air from the engine bay.
I had done this on my Z3 and the intake manifold temperature decrease was shocking to say the least (from 55-60C down to 30C, with 26C ambient temperature).

[Ali M]

Originally Posted by alexk

I removed the AUX fan and kept the viscus fan.
It's good enough for the non-AC CSL, so it's good enough for my car (I don't run the AC while stopped).

Why are you saying 88C for the thermostat ?
The S54 thermostat is 80C.

I like the electric fan installation.
I will try it on my car too for performance reasons.

Shimmy > the rubber sealing on the top of the bonnet should be sufficient to release the hot air from the engine bay.
I had done this on my Z3 and the intake manifold temperature decrease was shocking to say the least (from 55-60C down to 30C, with 26C ambient temperature).

I think I remember you saying on here you got a look at a non-AC CSL which has no AUX fan. So it is obviously ok with just viscous as long as no AC running when stopped.

Gibbo - Pretty sure it will run hotter with the AC on. Only 'test' I have done is leaving the car idling with AC on max blower and lowest temp on climate control (16 degrees) and had the digital readout on test mode on instrument cluster set to record the coolant temps.

It went up to 95 degrees and certainly sounded like the new electric fan was at max. I then turned the AC off and watched the temps plummet to 85 degrees.

That was enough for me to decide not to run the AC on track and in my head it seems safer having less strain on ancillaries when at max revs on track anyway.

Personally, I went from driving on track with the heater on max temp and full fan with me sweating buckets to now just driving with climate set to 16 degrees but no AC. That is enough for me and can live with no ac on track.

[shane@mbtech]

Originally Posted by Ali M

Yes on the front AUX/AC fan as in, yes it just helps aircon & rad at standstill and slow speed.

However, I wouldn't recommend that this is removed on its own without fitting the new electric Mishimoto fan because I don't think the viscous fan would be anywhere near capable of pulling enough heat out of the rad with the AC on at slow vehicle speed.

I have heard of people removing viscous but keeping the AUX fan and no issues. However, I have not heard of anyone removing the AUX and just keeping viscous. Probably because the car will overheat pretty quickly.

IMO removing the AUX should go in hand with fitting the new electric fan (in this case a Mishimoto). It is doing the same job but it is just doing it as a 'puller' rather than a pusher. Acting as a puller fan has the advantage of not blocking all the airflow while at high speed.

Yes, just use stock wiring. Just stripped and crimped spade connectors and then it is done.

Non ac car has viscous and no electric fan. Never overheats.

[shane@mbtech]

My non AC CSL never had a cooling issue, said this for years.

Remove that fecking great big fan blocking the flow.

[Gibbo]

Originally Posted by lawsy

Non ac car has viscous and no electric fan. Never overheats.

Cool suspect my issue was maybe having the AC on then whilst on track.

I shall remove the AC fan and the viscous fan and install the electric fan like Ali has done.

Shall also remove front plate and pollen filter housing on track and not use AC, should have no issues then fingers crossed.

[Ali M]

Originally Posted by lawsy

Remove that fecking great big fan blocking the flow.

Yes but would fit electric puller if you still want to be able to use AC while stationary / slow traffic....

...or just do as Alex does and be prepared to not use AC unless moving.

Originally Posted by Gibbo

Cool suspect my issue was maybe having the AC on then whilst on track.

Issue was probably having the big AC/AUX fan blocking flow but then double hard on the system also running AC.

Originally Posted by Gibbo

I shall remove the AC fan and the viscous fan and install the electric fan like Ali has done.

Shall also remove front plate and pollen filter housing on track and not use AC, should have no issues then fingers crossed.

Should be sweet after that. Was using all the rev's at Nurburgring last week, not having to lift off/short shift

[Graham]

Thanks Ali, very informative :-) I am going to order the mishimoto 16" fan and remove the aux fan and viscous fan. Did you clean up your radiator whilst you were there? Unsure whether you can jetwash them.
Have you any closer pics of the wiring you did?

So my understanding is correct with no aux or viscous fan but with 16" moshimoto fan you can use car as normal, AC on idle or on track?

[alexk]

Shimmy and all I noticed something else when I removed the AUX fan.
The AC fan has a 'plastic' coating that makes it look black.
At various points the 'plastic' material has seperated from the metal one.
In my opinion, this is blocking the airflow as the dimension of the holes is reduced.
This could explain why some cars overheat that didn't overheat in the past (provided that you have eliminated the water radiator, water pump, thermostat).

A test could be that you remove the AC radiator and try again

[billyboysm3]

As per my build thread we installed electric fan and electric switch on the M3 last week, removed front fan and aircon, was on track all day yesterday at 25• and had no overheating issues with oil or water, oil sat just above 100 and water was just under half, but was shifting at 6k revs.

This is installed on the 328 also and she never overheats.

[billyboysm3]

The electric switch, switches the fan:

Switch on temp - approx 90degC

Switch off temp - approx 80degC