Does your water temp move at all on track?

[shimmy]

I don't know, I'm no mechanic but I replaced viscous fan and no change (exactly same symptoms as you)

Don't forget HG leak is cylinder to cylinder, not water or oil related.

It can only be found on track at full throttle then 2 secs of the throttle and water temp drops (but oil temps stay higher). Therefore logic says the enine is affecting oil temps not water initially so I can't be fan, water radiator, pump, pipes, thermostat.

It must be oil related so engine is affecting it via timing, fuel, coils, injectors or oil cooling is affected by blocked rad or dodgy sensor.

When I replaced my HG i also changed coilpacks, refurbed injectors, oil filter and it went

Shimmy

Originally Posted by alexk

I had the same high temp problem today on track. Almost touched the beggining of red.

It was quite hot @ 30 degrees.

As soon as I backed off the throttle, it immediately dropped.
Then, I continued revving up to 5500 and didn't have a problem.
I suspect it's the viscous fan as with the engine hot, it doesn't engage properly (lawsy knows the check I am sure).
Also, for a year now when I would slow down from high speeds in germany, the temp would drop a bit.
I will start with the viscous coupling of the fan.

shimmy, how do you explain that the HG problem results to increased temperature, when there is no impact in the water or oil flow ?
I am just trying to understand why there would be a temp issue.