Join Date: May 2002
Location: Newbury Park, CA
A 10" SPAL fan will pull 1070 cfm through the intercooler (out of the engine compartment). Add that to the cfm the engine fan is pulling in (3000+ cfm?)... and you have quite a few cfm's that must be pulled through the opening in the grill (or from other "leaks"). The way I see it, that's a lot of fresh air.
* You are getting cool air into the intake.
* You are getting cool air into the engine.
* You are getting cool air through the intercooler.
Sure, it is a bit more complex, but I really don't see where the logic fails (I'm not a scientist, so tell me if I am nuts).
With the open grate blocked off so all air is forced through the intercooler, the intercooler would benefit, but the engine and intake would be taking in "post intercooler" warm air.
Oh... one more benefit. When you park your 930, the intercooler becomes a huge heat sink - takes a lot of time to cool down. With the fan, you could pre-cool the intercooler at idle (in the hot pits)!
1986 - 930 Coupe / 2016 - BMW X5 xDrive35i / 2015 - Volkswagen Golf TDI 6MT
Director of Automotive Insights at Kelley Blue Book / Forbes automotive contributor
Last edited by Emission; 11-11-2006 at 10:18 PM..