Project: RS2 ABY

[stocious]

Would not installing a cooler stat be counted productive on the thermal efficiency side of things?
ME,VE,TE. And is heat energy no? Sorry for hijack

[Sonic]

No, what should they be at? 140 iirc?

[Rusty]

Andy, have you checked the torque on your ARP head studs since it was built?

[prj]

It won't, but I see no point in this.
This engine is designed to run at 90C.

I don't see how having it open sooner or later has any serious effect on temperatures.
Rather more cooling needs to be installed.

If oil temp is hitting 150 then it either means it's knocking like crazy, but I know it's not - and it would have spun a bearing by now regardless if that was the case. Or it just means the cooling is inadequate.

Might be a good idea to make sure there is good airflow over the oil cooler, because when you are pushing so much power out of a small engine, it's going to get very hot all the time.

The core problem should be that the water temperature is going up. Probably the aux rad has been removed? Having the oil temp 30 deg over the water temp is perfectly normal.

[A80Avant]

Installing a cooler stat will result in constant fuel enrichment, horrible fuel economy, and reduced power.

What if you tune the car with the above in place? Why would it become enriched all the time?

[driftin jo]

Installing a cooler stat will result in constant fuel enrichment, horrible fuel economy, and reduced power.

And increased engine wear, due to the above.

[prj]

Installing a cooler stat will result in constant fuel enrichment, horrible fuel economy, and reduced power.

[5cylinderman]

Do not remove the stat completely. Just cut out the centre part and reinstall to ensure proper coolant circulation.
The coolest stat I have found to fit is a 74 degC from 1990's Land Rover 110 TDi.

[A80Avant]

gotcha

[prj]

Lean misfire due to injector heat soak after thrashing

O2 should correct it. But yes, this can be the case if the fuel has gotten very hot.

No,heat is coming from the head.

Running vems I have noticed something interesting which may be related.
On idle as the IAT becomes warmer, the mixture becomes leaner. Sure the lamda corrects it but it seems as if the hotter it goes the more wide you need to have the lamda to correct this and obviously having the fan kicking in as well as as other electrical stuff makes the idle a bit jumpy.

This was cured with the implementation of a second fueling table which was fuel vs IAT vs TPS and it acts in conjunction to the basic fueling map. It helps keep the lamda having to make small corrections as there is a dedicated line to idle.

Of course motronic must have something similar but I suppose it has to do with the extremes of being in the track etc

This problem does not exist on Motronic due to use of a MAF, as it's measuring airflow, not guessing it.
And on MAFless I have a table to correct for this.

[4WheelDrifter]

I could understand if it was a trackday at Haynes. But looking at the videos, there were some good speeds involved, so plenty of moving and cooling air, even if it was a tad warm. Things could've been hotter, like it was further South in the week.
Something doesn't seem quite right.

[A80Avant]

Read above guys. By thermostat mod I don't mean to remove it.but use the 80C one instead of the 90+C that audi specifies. Comes off a vw van which was produced to be sold in Africa. I ha e always used that since the upgrades.

[Rusty]

Mine did this when the HG was weak... Also worth checking the coolant system is well bled.

In a 30deg heat track day last year, oil 135 max on stock cooler, water 90+3 max.

[4WheelDrifter]

You can't remove the stat completely.

[chezz]

Would it not run cooler on the track by removing it completely - on a temporary basis...the thermostat is a 'restriction' in the system...just a suggestion.