Triumphrat

Bugler

Hey all. I have had my 06 s4 for a little over a month now and I've put almost 1k miles on her since. It now has about 5500 miles on it.

My girlfriend has the same bike but an 03. The only mechanical difference is that her exhaust was chopped and hollowed out and mine is all stock.

When riding around together last week, I noticed we ran at very different temperatures. She rarely got above 190 and I ran well over 200 the whole time. My fan was on almost the whole time which comes on around 220. Her dad thinks it may be that she has a richer fuel map. Makes sense cause hers is just a bit peppier than mine but I thought it was the exhaust.

Any ideas? Running the same bike at the same speed in the same weather in mostly the same gears... I'm stumped.

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tiriana

Try flushing the cooling system and check the radiator for air obstruction while you have the system drained. Her Dad's idea definitely has merit. Raising the CO baseline may richen up the whole map and make it run slightly cooler. Of course, it could be as simple as a sticky thermostat that doesn't open completely. That would be another thing to check while the cooling system is drained.
If you have TuneECU you can check the map and the CO setting as well as several other parameters that effect operating temp, otherwise the dealer can do the ECU analysis for you. Let us know what you find out.


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Will

It could also be a damaged temperature sensor. Those are easy to knock - they are low on the right side of the engine near the front.

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