Help or the pixies will get me...

[Brett]

As with all induction kits, the cold air feed only seems to be a real issue at low speeds/idle, once your travelling theres plenty of cold air coming into the engine bay anyway (unless your turbos glow white 99% of the time........

[Spotlamp]

I know what you mean about hot air going on, it\'s not ideal, but unless you build a fully enclosed system with cold air in only then I would speculate as to how effective it would be (don\'t forget the intercooler plays a big part in air temps).

If I didn\'t have the Apexi system I would go for this little number from the US:
http://www.m2performance.com/pintake.htm

I\'m pretty sure it runs twin K&N\'s internally and draws in cold air from a gap by the radiator.

As a seperate suggestion, you can draw cold air in from either side of the radiator.  Stock cars with stock rads have a wedge of foam stuffed down the side, about 20-30mm thick.  If you remove this and fabricate up some fibreglass up to the intake I\'m pretty sure you could get something to work.  This obviously wouldn\'t work with the Apexi as the filters are so big you\'d need a massive box to house them...

HTH
H

[Top_gear_towers]

See this goes back to my question about engine protection - factory filters are usually the best way to feed the engine as Mazda has spent a few quid researching them.

However, most cars dont run as hot as RX7s, so aftermarket filters dont do any damage (just a drop in bhp).

So - are aftermarket filters BAD for the RX7?

[chrisBoid]

Mazda\'s final descision is as much based on economy and noise reduction as power output, it\'s all a compromise, where as for us as aftermarket tuners, we don\'t have to compromise.

[Spotlamp]

I wouldn\'t subscribe to saying they were bad per say, however I would say that the colder the air you can get coming in the better if you\'re running higher than stock boost (important point).  For stock boost I don\'t think it makes a real difference.

Without having accurate, consistent data about air temps between an enclosed system and an open one it would be very subjective as to whether it\'s worse.

Being able to keep air temps at a consistent temperature is fairly important, especially in high boost application.  Having a consistent intercooler (FMIC or charge cooler - neither of which suffer as much from heat soak as an SMIC), fresh air intake and venter bonnet are probably the three things you could do to make it as consistent as possible, even in hot weather.

HTH
H