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I've searched extensively for the answer to my question - and I can't find an answer. I checked out AEM's website, and they have dyno results from the civic LX/DX and the EX. I have an Acura 1.7EL - it shares its engine, drivetrain and intake with the canadian Honda Civic Si. Anyhow, under the EX 5-speed intake, it said the stock power was 109.1hp. My car is rated at 127hp - and this is the intake that's meant for may car. WTF? All I want to know is how much power gain I can expect. For the 21-500 (the one for my car), the gain is 8.9hp at the higher ranges.

First off, I find that a tad bit optimistic. I was hoping for 5hp, but 8.9? that's almost 10hp!!!

I also checked out the one for the 2002 Civic SI - and I don't think that one matches my engine either. The stock HP on that one is 137.5hp (according to AEM) with a 4.5hp gain with the AEM CAI.

I know that the 21-500 fits my car (I checked the EX-5speed DIY and the pics match my car EXACTLY)...

Any insight here? Any info would be much appreciated. I ordered an AEM CAI from a local shop, getting it on tuesday (I can't wait!!!). I installed a magnaflow cat-back this weekend, sounds sweet-a$$-sweet. Nice, deep, quiet - exactly the non-rice exhaust I wanted!


Thanks!

 
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They may be talking about wheel HP.

 
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yep hes right, big difference btween hp at wheels and hp at the crank. there's like a 5-10% loss of hp at the wheels.

 
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127hp is at the flywheel, and a quote given by the automobile manufacturer, Honda (America).
109.1hp is measured at the wheels, on a dynamometer or dyno. the 17.9hp difference results from energy loss through the tranny, then axles, then tires, etc.etc.

Aftermarket product manufacturers tend to dress up power-gain figures. Even if the claims were true, 127hp+~9hp still is less than 140hp at the flywheel and even less at the wheels: still weak, but at least your engine will sound a bit better.

 
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I have to disagree - follow my math:

127hp at the crank = 109.1hp at the wheels.
therefore the crank hp is 1.164 times the wheel horsepower.
In other words, you lose 14% through drivetrain/tire/etc losses = system is 86% efficient at delivering power to the ground.

AEM claims that with a stock horsepower of 109.1 at the wheels, the CAI can increase it to achieve 117.1
so, with an AEM CAI, the CRANK horsepower would rise from a stock 127hp to 136.3 = 9.3 CRANK horsepower gain.

This is assuming that the losses to gearing, tires, etc are LINEAR (which over this small increase in power they probably are).

Either way - that's a pretty healthy gain from an intake.

 
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the 2002 Si they are talking about is the hatchback SiR in Canada

 
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Local dealer is selling 2002 Si's at invoice. Around $18,000.

 
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No - the Civic Si-R in Canada has the 160hp RSX engine...

 
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NO! the civic Si type R has 200hp

 
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160hp at the crank is right for the SI/SIR

ashburn there is no SI TYPE R in the state or canada. We only have the SI/SIR with 160 hp.