[s-cars] Oil Temperature Question-How Hot is too hot

[Vincent Frégeac]

IMHO, the "better answer" is a greater pressure differential across the oil
cooler. The role of the duct was to route the air pressure in front of the
bumper to the air cooler so it forces air through the cooler. So you need to
bring back some pressure in front of the cooler.

Fans could be a solution, but with the risk you mentioned. Creating a duct
that work with the FMIC would be my preferred solution. You can start with a
prototype made of air drier hose, cardboard and duct tape (to be tested on
the road under normal driving condition, track inspectors don't like duct
tape). Then, if you see a difference, you'll know it's worth building a more
robust version.

Note that a cooler doesn't require a lot of air flow, so an opening quite
smaller than the cooler, or a restriction in the air path, should still give
a good efficiency as long as the duct is reasonably air tight.

Another solution would be to move the oil cooler closer to the bumper
opening, like in front of the FMIC if there's some room left. But I'm not
sure the OEM oil cooler was built to resist the impact of whatever goes
through the bumper grille, so I would still favour the duct route.



Vincent.



-----Message d'origine-----
De : s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] De la part de Manuel Sanchez
Envoyé : 23 mars 2009 19:21
À : audi list
Objet : [s-cars] Oil Temperature Question-How Hot is too hot

Fellow S-Heads,

I was wondering what oil temperature might be considered too hot for  
our cars during a Driver Ed track session? I usually attend track  
events that are early spring or late fall, so the outdoor  
temperatures are on the cooler side, however "warm" days in April and  
November aren't unheard of.

When I'm pushing the car hard, and it's warm out, I've seen the  
needle get a needles width past what would be analogous to the 3/4  
tank full mark on a fuel gauge, at the un numbered hash mark between  
130 and 170 degree's (150ish). That's the last tick mark before the  
"ludicrously hot" measurement on the oil temp gauge.

It's interesting to see how much of an effect the outdoor temp has on  
the oil temps. At least on my car, cooler track days show up as a  
noticeable measurement (lower) oil temps than if the day were warmer.  
I can't imagine what a summer track day would be like.

I had a instructer once that suggested I back off because the oil  
temp seemed to be to high. Taking it easy did cool things down during  
the session.

Under normal driving oil temps are normal and stay at the 130 deg C  
mark.

My car doesn't have the undertray anymore due to the FMIC and LLTek  
bumper, so the ducting that was there is no longer.


If I need more cooling, is there a "better" answer? Do those little  
electric fans really work or would they get cooked easily due to the  
proximity to the turbo and downpipe? Is a bigger oil cooler core the  
"better" answer? Do those heat sink things that you can wrap around  
an oil filter do anything measurable?

Regards,

-Manny

95.5 ur S6 Avant (mostly RS2'd)


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