Overheating on track only

[shimmy]

Next thing I am replacing is the temperature sensor.

But again, the manual says this is normal.

Are you still having problems Alex after your fan and shroud delete?

[alexk]

Are you still having problems Alex after your fan and shroud delete?

The AC fan is off.
I have the clutch fan (I had another issue with the radiator) so until I find out the radiator was gone, I put back the clutch fan.
However, I have issue only on one road (tunnel) with low speed and it goes up to 96C.
It's so strange.

Saturday I will be in hot Monza so I will see if the car overheats or not.

[Ali M_csl]

So you are saying OeM rad is good enough, I still think we have not found the issue that is causing this, just various ways if masking it, let's not forget this issue occurs at full speed, maximum airflow theoretically, maximum cooling.

Still think it could be an airflow issue. Also let's not forget the fans do not work at high speeds, they are turned off.

Yes, the OEM rad is good enough. I would even disagree with Steven's post about his rad keeping temps down a little bit more as mine never once budged from middle of analogue gauge - his did rise at one point although think he was using AC on track.

I also ran mine on service mode and temps were around 88 degrees when on it. Think highest was 92

Steven and I both agree that it is an airflow issue, hence removing the AUX fan and shroud. It has 100% worked on my car to solve the issue.

I could possibly improve it further with bigger oil cooler and water wetter but just removing viscous and AUX fans + adding electric 16" Mishimoto fan behind stock rad has done the job.

[Ali M_csl]

That is a lot of room for something to be taking up which is not even switched on above 88 ish mph

(Pic featuring StevenEK9 himself...)




So much more airflow to rads, oil cooler and PS cooler









Mishimoto 16" fan was around £65 delivered



Mounted. This is now run off the stock AUX fan controller (box with brown + blue wire) and functions as per the tables Alex (I think) posted earlier in thread. I.e. the ECU turns it on when it needs it. Have had the AC on full max fans at 16 degrees and the fan is still just enough to cool the car at standstill.



Threads on waterpump sticking out where viscous has been removed.






Cable tied stock AUX fan controller out of the way. Probably a better location but seemed easiest to me without extending stock wiring.

[Gibbo]

Hi there

Was at Donnington recently in about 22-24c sunny weather.

My car over-heated for first time:-
Oil temperature was 115c-120c so no issue there, its never reached 125c marker.
But coolant temperature touched the red, backed off and within seconds it was back to half way mark.
This was after about 20 minutes on track with a lot of passing other cars so not clear air.

But I've changed a few things at once on my car which could account for this or maybe just hot weather:-

1. CSL airbox fitted.
2. Viscous fan removed
3. Under-drive pulleys fitted.

My car is running Evolve Alpha-N remap, has Milltek 100 cel cats!



Ali M so have you removed both AC Fan and the viscous fan and then fitted that 16" fan? How is your car on the road in traffic, does it overheat?

Where did you buy the fan from for £65, is it easy to fit and wire in?



P.S. Where did you get your sticker number plate done as I shall do that to help with air flow as well?

[shimmy]

My next simple mods might be to removed front plate holder and remove pollen filter housing and see if air flow improves.

[Graham]

So from reading what everyone is writing the front fan literally just helps aircon at standstill or slow traffic?
So you can get rid of that straight away with no modification?

Then to make it even better you take the viscous fan out and put a mishimoto 16" fan in and wire it in using the wiring from the front aux fan?

This seems like a pretty easy and cheap mod if so.

[Ali M_csl]

Hi Gibbo,

Yes, removed both AC (AUX fan and shroud shown held up in the pics) and the viscous fan. No overheating issues in traffic or on the road.

The highest I saw it read was 95 degrees when it had been sitting idling for 15 mins with no airflow with the AC on max just to test. Ambient temp was around 26 degrees at the time. In this situation the thermostat was obviously fully open and the Mishimoto fan at 100% with the AUX / ECU controller working the fan to pull as much heat out as possible - which it did.

Normal day to day round town even with AC on it is on average mid 80's and in which case the thermostat shouldn't even be open yet. On a hot day I would expect it to rise above 88 at which point the thermostat will open to circulate through the rad. The AUX fan controller will then function the fan depending on temp provided it is less than 80+ mph (not sure magic number it turns off).

Anything over that 80+mph and 88 degrees when stat opens and think it is just airflow alone through the rads doing the cooling.

Fan bought from here and fits exactly to the lips on top and btm of stock rad for mounting. Think I used M4 or M5 bolts - http://www.mishimoto.co.uk/mishimoto...-inch-fan.html


The number plate is an actual plate in legal font and although it is 3/4 size, it keeps the same height to width as legal font. Obviously opens up the airflow to front bumper a bit. Think it was from somewhere like 'fancy plates' or something. Never had an issue in 3 years running it from the BIB

[Ali M_csl]

So from reading what everyone is writing the front fan literally just helps aircon at standstill or slow traffic?
So you can get rid of that straight away with no modification?

Then to make it even better you take the viscous fan out and put a mishimoto 16" fan in and wire it in using the wiring from the front aux fan?

This seems like a pretty easy and cheap mod if so.

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.

[Gibbo]

Thanks Ali

Any weight saving from changing AC fan to the 16" one?

Maybe that was my issue on track too as I was running with AC on, so does the engine run cooler with AC off when on track then?

I will also do as Shimmy says and when on track will remove front number plate/holder and the pollen filter housing.

[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_csl]

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]

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]

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.