Oil cooler diverter valve

[Ali M]

Originally Posted by shimmy

The US guys I have spoken to have deleted the two OeM fans (to get better flow trhough)and replaced by a high flow Spal. Cooling problems sorted on hot days on track but occassionally get overheating at slow/stationary speeds on hot days

Originally Posted by stevenEK9

hard to find the optimum compromise i guess

i did read a thread online about someone who upgraded the Auxiliary fan to a SPAL fan that had a higher CFM rating - ran that combined with no viscous fan and a motorsport thermostat. seemed to do the trick

Reading both your replies there got me thinking. I am not very technical with these things so excuse me if I have some of fan types etc mixed up, just thinking out loud...

With both examples, both viscous (engine driven 'puller' fan behind radiator) and aux fans ('pusher' fan through AC condenser/rad) have been removed. This would increase the frontal area of AC condenser/rad that is exposed to direct airflow, as to me it looks like a large part of this is blocked with OEM aux fan plastic end 'casing'. Guess it is the same story for the plastic on outside of viscous fan 'frame'?

From both examples above it looks like this has helped airflow at speed.

In Shimmy's example, if this was a 'puller' fan, Spal or similar - possibly it struggles to drag enough air through at slow speeds for low speed cooling on hot days?

In Steven's example (which sounds like it could possibly have been a success), could replacing OEM aux fan with a large capacity pusher fan in front of AC be the answer?

This combined with Gorilla's point re coolant % mix and/or 'water wetter' - do you think it could allow retaining of AC? I am not really keen to change out rad to aftermarket unless it uses all the original mounts as don't want to be butchering the car fabbing up additional mountings. Not really buying the motorsport stat idea as once it is open, it should allow the same volume of coolant to flow.

???


Just to add, whether some peoples cars have had overheating issues on 'this day' at 'that track' or done X amount of laps etc, seems to me that it is pretty clear the S54 + AC setup is not enough to cope with track use in certain conditions with some driving styles/pace. All the others must be close (as shown by Paul's example with being behind the R8, briefly blocked from airflow) to the limits. Only exceptions seem to be CSL's with no AC.

[Ali M]

Took some pics of my car at lunch...

No restriction to lower part of rad...







Through grille...







If aux fan is removed, the plastic fan housing 'bits' go - so would increase surface area airflow?











Same for lower part of aux fan frame?









I don't know what the black 'tube' part and the upper silver 'tube' bit sandwiched inbetween the aux fan AC rad are exactly - presumably to do with the AC - so both would stay?





Even if both OEM fans are removed, guessing the plastic exit 'shrouds' would stay to drag air out from the back of engine radiator and stop it spilling to the sides of engine bay









Probably a few thick questions but probably easier to get thoughts going with some photos.



Also, looking at the pics, first improvement could be had with cleaning out the fins on front AC rad...

[stevenEK9]

digging up this thread again.......



so finally got everything together to what I hopefully think will solve the elevated water temps mentioned in this thread and other areas of the forum

looking through the front end of the car, the Auxiliary fan blocks SO much of the clean air in. then once up to X mph the viscous fan doesn't really do much apart from disturb the air which is trying to escape behind the radiator

also the radiator itself is nowt special

so

had a new radiator sitting about for a while, it's a full aluminium (oem has plastic end tanks) Fluidyne / Turner Motorsport job. 25% higher capacity as well as being a triple core vs the oem double core

now fan wise i've decided to ditch the 2 oem fans completely, but retain the Auxiliary fan module and use it to power a Mishimoto 16" slimline puller fan which i will mount on a custom full alu shroud on the back of the radiator. fan is rated at 1850cfm so should be more than adequate to keep temps stable in traffic etc. best part - fan comes with a lifetime warranty and cost a mere £63 delivered

samco hoses and an oem thermostat will go in same time

fan arrived today so mocked it up, perfect size wise





will fit it all up in a couple weeks time and give some feedback once it's had some use!!!! over to the ring for DN10 in July which will be the real test

[Brandtner]

Nice. Looking forward to feedback.

[pinkpanther008]

Gorilla,

Do you run products such as Waterwetter supercoolant or Evans Power Cool 180° (Waterless Engine Coolant) in your 30%af/70w% mix?

Do these assist in alleviating some of the temp spikes being discussed?

PP.

Originally Posted by The Gorilla

Hi,

Quote, ''Gorilla could exhaust gas temps cause a problem at WOT?''

For sure, as Mr Lawsy says you do not want
it, but if I am correct I think Shimmy was/is
running std Map etc.

As a side note on the E30 M3 with S54 CSL
engine I used an 3 core water rad with approx
35% more surface area than the std version.

But I also ran 2 x Heat exchangers and it was
dry sumped so the oil lines helped to dissapte oil
heat, but getting that engine over 100 deg
oil temp even with 28c plus ambient air was virtually
impossible, and water was always around 80/85 ish.
no matter what your driving style was.
[coolant was approx 30% Anti freeze 70% water]

Regards,

The Gorilla.