joedirt

Ok...now for me to spend more $$$ I see alota of cold air intakes out there.But alot of them still suck hot air from the engine bay. Im trying to find out which of the intakes is the best price per performance. Petit,N-tec,M2,Trust/Greddy,Peter Farrell(still havent seen 1 of these yet).

Johnny

from your list...I'd chose M2's ....if you dont like carbonfiber...then I would choose rx7fashion.com's box...

Cost is about the same... ~5 bills..not exactly the cheapest

Rix7

Get the Apex-i Power Intake system. I believe it is the best performing hot-air intake (although the extra performance over others is marginal) and you don't need to maintain it at all. You can't beat the $215 + shipping price at rx7store.net either. I also think it looks better than most of the intake systems I have seen on FD's. I thought about getting a cold air system too, but for an extra 200 or 250 dollars?? In my situation, I thought it would be wise to use that money elsewhere. So, I'll upgrade the intake system later down the road if I feel that I really need to. Happy shopping!

ttpowerd

apexi is very nice

mr_jonboy

I am not saying this b/c I own it, considering it was on my car when I bought it, but I hear from a lot of people on here and elsewhere that the Pettit intake (cheap looking as it may seem) provides the most power gains.

black99

The apexi filters are what makes it the best, higher flowing , and let less dirt in than any of the other japanese company filters such as greddy, hks, etc..

These tests were on a skyline gtr, but you can still see the apexi comes out ahead.

http://www.gtrowner.com/induction.html


Also I can't see paying 400.00 for a cold air box, but ok if you do..

mr_jonboy

Good test.

SanJoRX7

Stock is the best for the money...once you have the car, it's FREE!! Since I don't have an aftermarket intake I can't comment on their quality, but if I had to choose right now it'd be either the CWR CF intake or the M2 CF intake (for the box type), or the Apex'i intake (for the open style). I'm not that rich right now though

mazdaspeed00

iTrader: (6)

i would do a feed air intake head light cover with an apexi air intake.

joedirt

Thanx for the info..I think ill go with the Apex. Ill let you all know how it goes.

Yenven

Someone tell me whats the point of a cold air intake on a turbo car?I dont see it doing much.

JoeD

cooler air = denser air = more oxygen = bigger explosion = more power = faster car.

Yenven

but it realy goes

cold air + hot *** turbos = hot air + Good IC = cold air
Thats how i always looked at it.

WhtRocket

Personally, I would not use a hot air intake. The stock intake is a cold air intake (sort of). The hot air basically draws off the turbo side of the engine bay. Sounds likea bad idea to me.

I used the CWC cold air intake. It's ok but makes some noise. The M2 is similar. for a cheap cold air just do the stock air box modification and use a K&N. That's real cheap, gives you a cold air inlet and, if you do it right, should give lots of cold air. My 2c

maxpesce

Modified stock Airbox with a K&N drop-in Check my photos in the Gallery and SEARCH my posts on the subject.

Gir

Any way to convert the apexi intake into a cold air intake ?

Wuppy

Why pay hundreds of $$$ just to suck hot air?
The stock air box mod with K&N drop in is the way to go. Cant beat $60 and no noise.
http://www.rx7turboturbo.com/robrobinette/coldair.htm

This is interesting as well:
The third-generation RX-7 had come off Mazda's rigorous development test programs on the bench and on the demanding Global Road Circuit section of the Miyoshi Proving Ground with flying colors. Yet, there was one arduous test left undone. When the car was taken to a race track near Tokyo known for its tight turns requiring short bursts of speed followed by fierce deceleration, the pride of Mazda's rotary rocket team quickly cooked its powerplant when pushed to the limit. Subsequent investigation revealed that air temperature at the entry area had risen as high as 50 C (122 F). Fresh air for the engine's consumption was taken from the single intake that also fed to the air-to-air intercooler. On wide-open driving, air flow reversed its course from the intercooler and went straight into the engine's intake. The intercooler was acting as an inter-heater! In the updated RX-7 with a designed fascia, fresh air is taken through a separate, dedicated duct guided by a newly installed air-guide. Air temperature at the engine's intake entry area has been halved to about 25 C ( 77 F), which adds about 7 kW (10bhp) to the output.

Lunar7

Wuppy;

What year RX-7's had this upgraded air intake system?
Do you know what parts are required to retrofit a 93-95?

Wuppy

99 up
see the article:
http://www.rx7turboturbo.com/robrobi...ae_article.htm

Devilish

I like my M2 aluminum box but for the best value:

http://www.rx7.com/pics/in520001.jpg

jasonsr1

"but it realy goes

cold air + hot *** turbos = hot air + Good IC = cold air
Thats how i always looked at it."

Actually that's not quite right. The colder the air entering the turbos, the denser the compressed air leaving the turbos. Also, it is true the air leaving the turbos is gainig heat from the turbos due to the exhaust, additionally the air is gaining heat due to the compression process of the turbo(s). The compressed air is then cooled by the intercooler creating denser yet slightly reduced air pressure at the exit of the intercooler. This pressure loss is due to the restriction of the intercooler. This restriction varies with intercoolers and varies between .5-2.0 psid. So, when you are reading say 12 psig at your pressure gauge your turbo is seeing 12.5 to 14 psig.

maxcooper

You cannot make up for sucking in hot air. Your engine will pay for it in backpressure because the turbos need to pump more of the hotter air to result in the same temp/pressure in the manifold when compared to sucking in cooler air. And that assumes that your IC will reduce the temp to the same intake temp level, which it won't. The increase in backpressure (due to the turbos working harder) will result in your car making less power.

Be skeptical of dyno tests that show open intakes making more power -- the results aren't very meaningful if the hood was open (unless you plan to drive without a hood).

Hot air is bad, but we each make our choices based on a variety of factors. Making the best choice depends on us being realistic about the costs and benefits of each option. Sometimes that means a hot air intake, but don't kid yourself about it the hot intake air not costing you power.

If cost is a major concern, you might consider that hot air kills the expensive air pump.

-Max