Quote:
Originally Posted by Hujan
Nice find! I assume we'd need a Z4 35is radiator fan? Or are they all the same in the 1M/335is/135is/Z4 35is?
Also, bear in mind that downpipes usually reduce oil temps. The stock cats trap a lot of heat in the engine bay/turbos and contribute to higher water and oil temps. Catless or HFC downpipes would vent that heat better. Perhaps not significant by itself, but combined with a fan and some modulations to the factory oil cooler, it might go a long way.
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Realoem and other posters suggest Z435is has the same 600W radiator fan as the Z435i.
I haven't looked up 135is
I would source from 1M/335is since those for sure have the 850W radiator fan. "should" be plug and place since I believe the 850W and 600W fan have the same form factor
Yes, high flow DP, FMIC, radiator fan and maybe lower thermostat seems like a solid play for more HP and lower temps.
I am speculating (and going off topic) next.... I believe the high oil temps in the N54 is to combat the carbon buildup on valvetrain that can happen in direct injector engines (S65 is not direct injection). There are a lot of articles about carbon build up around.
Check out this article that suggests hotter temps cause deposits to burn off
"The bulletin also suggested that harder driving would result in hotter intake-valve temperatures, causing deposits to burn off."
Read more:
http://www.roadandtrack.com/motorhea...#ixzz2mTPWMlBg
http://www.edmunds.com/autoobserver-...-adopters.html
FWIW, if I were to do all these oil cooling mods I would be sure to add oil catch can too.