|
Pure ram-air does not have any meaningful affect until you get above about 75 mph (~120 kph). At legal speeds it's really not going to do anything.
Now, getting cooler air from outside the engine compartment can make a measurable improvement at all speeds, but whether this is noticeable is debatable. The general rule is that there needs to be at least a 10% increase in power before there are measurable changes in a car's performance. Going from, say, 160 hp to 170 hp really won't make much of a difference at all in the everyday world (on a track it might be good for a tenth, which can be important, but on a street car it's really pretty pointless).
As a practical matter for a street car, the juice isn't worth the squeeze.
__________________
---------
Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
|