Overheating on track only

[shimmy]

Originally Posted by CSL BEAST

Hi shimmy its will shanes mate if bmw have changed the motor you now have a new motorsport thermostat,new water pump,oil cooler and all water pipes etc have been changed or checked .The only other parts left in the cooling system would be radiator ,heater matrix heater control valve .Its very hard to check the radiator at the track due to all the plastic cowling so feeling for a cold spot or blockage reducing flow is imposible .As some body else has said reducing air flow to the rad by following a car closley made the temp go up to 3/4 if this is true a blockage in the radiator could possibly cause a similair rise under extreme conditions such as hot ambiant temps and 100% throttle .The csl runs a closed loop 02 sytem so it is monitoring exhaust gas temp and fuel mixture all the time even at full throttle constantly adjusting air fuel mixture not to mention the knock sensor that would pull timing and add fuel if things where going lean or hot i would be very supprized if a cat would cause this issue ,if it was the cat/exhaust temps the eml would be on as the temp sensor in the exhaust down pipe would pick it up.Just my opinion hope this helps to decide what part to change first GOOD LUCK

Cheers.

1. Radiator
2. Heater Matrix
3. Heater control valve

I guess I have dismissed the radiator as it is so obvious nd so many US ATS have fitted new or upgrades and not solved the issues.

Heater matrix is a good call. I have no idea what it does or how it could affect temps, same with control valve. How do they work?


What do you reckon about fuel regulator and filter that I've just swapped?

[CSL BEAST]

Hi Shimmy
sorry its taken a while to get back to you.The heater matrix is a small heat exchanger or radiator inside the heater box air is blown through it by the heater motor to heat the interior cabin .The heater control valve or duo valve controls the flow of coolant through the matrix .Before i even thought about taking the dash out i would rig a by pass pipe up to rule the matrix out its a pig of a job .Before i went any further i would add a forte coolant system flush run the car for a day or two drain the system and reverse flush the rad wont cost much and may just help then again may not .If myself or lawsy can help just let us know .The fuel filter and regulator can only be a good move after 9 years of use imo.

[northernjim]

Originally Posted by thegingerninja

Sometimes when the internal coolant system reaches 7 or 8 years old there can be a thin layer of corrosion across the entire internal surface area. If the water temp reaches boiling point you can get "kettling" (small gas bubbles) forming on this line layer of corrosion. Obviously the air bubbles act as an insulator and the temp will increase if you don't drop the engine load.

I think there are some products you can run through the coolant system to remove the layer, and then refill using an additive which combats the kettling. I had a problem like this on a race car and I tried a product called water wetter - I wasn't convinced it would work, but I saw a drop in coolant temps afterwards, probably about 10 degrees.


Only way to find out for sure is to rule them out one at a time.

water wetter/other products are available... contains xyz tho which is unfortunately not good for seals

Originally Posted by CraigMillwardCroft

Was that due to also drive shafts breaking on circuits

never missed a beat

Originally Posted by alexk

That's coming from 30+ years of experience in a country with very hot weather.

feck just how old are you Alex







Can I ask does anyone know what the water temp gauges readings are? what is operating temp? 100c I assume, but how hot is 'red' 125c? 150c?






I did suffer from a hot engine at donny, when following csl's for a lap waiting for them to move over like you say tho, back off and it drops straight back down

[alexk]

Yesterday in Monza I had no overheating issues

My problem is solved

[AlexGTT]

Originally Posted by alexk

Yesterday in Monza I had no overheating issues

My problem is solved

Yes, but what were the ambient temperatures Alex? Generally the issue only happens with 25 degree+ ambients.

[shimmy]

Originally Posted by AlexGTT

Yes, but what were the ambient temperatures Alex? Generally the issue only happens with 25 degree+ ambients.

i think Alexs problem were slightly different but i agree, this only happens as my original thread about 23-24 degrees upwards

[alexk]

shimmy I did a trackday this friday with 38C... With up to 30C I didn't have this problem.
So, I had at times the engine water temp rising a bit, but it's a bit strange.
It would initially get a bit hotter, I would back off for 30 secs.
Then one more time the same thing would happen, I would back off for 30 secs and then throttle to the floor non-stop without issues.
I did a session of 40+ mins, I had the water temp rising twice in the beginning and then no issues.
It seems to me that the thermostat is misbehaving, I will check with my father to confirm.

The oil temperature was at 110-115 all the time.
I plan to install the Motorsport thermostat.

[adem.csl]

Originally Posted by alexk

shimmy I did a trackday this friday with 38C... With up to 30C I didn't have this problem.
So, I had at times the engine water temp rising a bit, but it's a bit strange.
It would initially get a bit hotter, I would back off for 30 secs.
Then one more time the same thing would happen, I would back off for 30 secs and then throttle to the floor non-stop without issues.
I did a session of 40+ mins, I had the water temp rising twice in the beginning and then no issues.
It seems to me that the thermostat is misbehaving, I will check with my father to confirm.

The oil temperature was at 110-115 all the time.
I plan to install the Motorsport thermostat.

Alex were you driving close behind another car picking up their heat from running in their hot air?sounds a bit like sticky thermostat that has freed off.could also be the fin in the water pump if you have plastic fin water pump the fin gets hot expands and loosens from the shaft then catches again.
I've only done 2 trackdays soo far and last one was last week.ambient temps of 28-25c give or take(was a hot day)and i got 125c oil temps and water temp perfect half way used track and sport mode all evening.run like a dream!

[Graham]

110-115 on a 38c day!? Is that standard oil cooler? Mine hits 124 on a cold day!

[adem.csl]

Originally Posted by Graham

110-115 on a 38c day!? Is that standard oil cooler? Mine hits 124 on a cold day!

That's cool i was gonna question if mine was too hot but im going brands monday so i will run and record my temps again