[Euro] Apexi Power Intake (was AaronNg's "Secret Weapon" *REVEALED*)

Comparing stock and the Apexi, my butt dyno says they are the same. The throttle response seems to have improved slightly, but it could be my imagination. Power-wise, it's the same.

Heat wise, after driving for 30 minutes, I popped the bonnet and felt the metal pipe. It was coolish. I'd say 20 ºC in a 16 ºC night. But it still sucks in hot air from the engine bay, so the enclosure is priority #1 (and also to stay legal).

Want to know something stupid? My insurance company says that they will cover my intake with no increase in premium. But they will not allow a Cusco strut bar.

what? what is their reason for not allowing strut bar?

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Originally Posted by euro77

what? what is their reason for not allowing strut bar?

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They said that it's a structural component. Then I asked, can I modify the suspension. Their response was "Yes, you can lower your car". GRRR.... they think suspension mods = slamming it.

I'll call again next week and get another dude on the phone.

which insurance? if u're with shannon they probably would have known better :D

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Originally Posted by euro77

which insurance? if u're with shannon they probably would have known better :D

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LOL, Honda insurance. But I get new car replacement for the first 3 years, so I'll stay with them for 1 more year. :p

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Originally Posted by Tobster

I think you may be thinking of this one:

http://www.sca40.com/intake/

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That is it - pretty good setup as long as you could box it. He doesn't even address the issue of hot air in the engine bay.

Nice! That filter and piping is very neat and after you make the insulation box and cold air intake tubing should have better power gains everywhere!

Its funny when you said changing the brackets changed the noise of the filter at various RPMs as well...!

Anyway regarding the construction of the insulation box. I have experimented with a Heat Shield consisting of Vertical shields, and then with or without a Top lid, plus proper cold air plumbing leading from the front bumper hole before. I felt it was better without the top lid, it felt like it could suck in more air at top end and yet throttle response wise, couldnt tell much difference.

I was thinking it is mainly to do with volume of air supplied vs negative pressure within the insulated box, vs heated and cold air. So anyway, it would be good if you play around with it and see which settings suits your car better too!! :)

When I put the 2nd bracket and hose clamp on, there was an additional bend where the hose met the steel pipe. I guess that robbed some power as yesterday, I took that bracket out and repositioned the filter so that the piping was straight. My butt dyno feels a difference! I couldn't believe that the little bend was enough to cause a difference!

I'm a bit confused here. I thought the benefits of short ram over cai was better throttle response (boost in low-mid range) because of the shorter piping, but it seems like most SRIs (including the more expensive gruppe m) are really designed for top end power. Can somebody clarify this for me?

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Originally Posted by sodaz

I'm a bit confused here. I thought the benefits of short ram over cai was better throttle response (boost in low-mid range) because of the shorter piping, but it seems like most SRIs (including the more expensive gruppe m) are really designed for top end power. Can somebody clarify this for me?

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When you improve breathing, what you are doing is addressing the issues of the stock breathing characteristics. As you know, at low RPM, the intake is not working at maximum capacity. So even if you changed to an SRI or CAI, they would not be working at maximum capacity and perform either the same or worse than the stock intake (which was probably designed to operate at peak efficiency at low to medium RPM). At high RPM, you start to reach the limitations of the stock intake and the additional maximum flowrate capacity of SRI and CAI start to show their benefits. That's why gains are observed at high RPM and not at low RPM.

Thanks for the explanation Aaron. :thumbsup:

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Originally Posted by aaronng

When you improve breathing, what you are doing is addressing the issues of the stock breathing characteristics. As you know, at low RPM, the intake is not working at maximum capacity. So even if you changed to an SRI or CAI, they would not be working at maximum capacity and perform either the same or worse than the stock intake (which was probably designed to operate at peak efficiency at low to medium RPM). At high RPM, you start to reach the limitations of the stock intake and the additional maximum flowrate capacity of SRI and CAI start to show their benefits. That's why gains are observed at high RPM and not at low RPM.

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Do you know the reason why CAI/SRI's don't work as well compared to stock airboxes, in the low rpms?

It shows up on the dyno too... hmmm...

Someone told me anything with an airbox but with a bit of air volume is better for lower rpm, but didn't offer me a more technical explanation. Very curious! :p