Motorsport Thermostat

[Slideways]

Yes it takes longer without a doubt to get up to temp. The advantage I have found with the lower temp thermostat is in decel zones like 10a-10b at road atlanta, you can get get quite a bit of heat out of the motor, since the thermostat closes later.

If my car were only a street car it would really not have an advantage. In day to day use I have to consider the longer warm up times, it isn't ideal but is what it is.

It is going to get swapped out as it is taking longer for the oil to get up to temp according to the gauge.

I wonder if the oil temp data only comes from the oil level sensor or if it is calculated using other temp data? I remember an old post where someone said that it was calculated using the oil sensor and the ambient air sensor. One of the DME experts might know.

[Anri]

For those of you running Anri's 70 or 75 thermostat, does it take longer for the oil to get up to temp?

Slidewways,

FYI there is a difference between 70C and 75C.

Let me sent you a 75C. Try it drive it for a month collect data,
observe compare to OEM.

If you don't like it ship it back to me, put the 80C-OEM. If do like
it buy mine.

Sent me PM with your address and name and I will mail it to you.

Were you located in California ?

S65-B40 79C
S38-B38 79C
S38-B36 79C
S62-B50 79C

Regards,
Anri

[AWE46M3]

To clarify for anyone following this thread - Anri installed a 70°C thermostat on my car, which is meaningfully different from the 55°C motorsport unit that opened this discussion.

My reasoning to go with this thermostat during my cooling system refresh was simple: warm oil, cooler water. On a 20+ year old engine with an original head gasket, I'd rather run a modest buffer below the stock 80°C opening point than have none. That's not a cooling system fix - it's a margin decision on an aging car where I know what the highest-risk component is.

In practice: oil comes up to temp normally, coolant sits slightly left of center on the gauge - somewhere between the middle mark and the adjacent dot on the cold side. I'm satisfied with that. ChapterM3 has reported similar results even in LA summer traffic.

I'll acknowledge samthejam's point - longer warm-up times are a valid call out, and if this were purely a street commuter I'd weigh it differently. The ECU/fueling concern is also worth noting for anyone considering the 55°C motorsport unit specifically; at 70°C it's far less of a factor given how much closer that sits to stock.

The stock 80°C thermostat is a perfectly good answer for most people. For my specific car, at this age, this was the right call. To each their own.

[Advorsor]

I have 1 OEM Motorsport Thermostat for sale if anyone is interested.. Brand new $70 + shipping