AP1 vs AP2 dyno results

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Oct 24, 2009 | 10:16 PM

#11

CKit

Former Moderator

Joined: Aug 2004

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Quote:

Originally Posted by GPWonTan,Oct 24 2009, 02:20 PM

i've always wondered this about dyno + gears.

so i have 4.77 gears. i should have the same hp
but.... what if i entered the same oem gears spec into the dyno as a stock ap2... and then get on the dyno, wouldn't the result tell me how much diff in power it is sending to the wheels?

am i making sense? how is my logic flawed? please explain

Logic is flawed. Power is the same. But at 20mph, you're putting down more ponies with the 4.77s because you're at higher rpms. You don't need a dyno, you need the TurnZero gear calculator.

Oct 24, 2009 | 10:19 PM

#12

jdm_dc_fan

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Joined: Apr 2009

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open air box = hot air intake.

Oct 25, 2009 | 12:50 AM

#13

Luckyaze

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Joined: Dec 2005

Posts: 2,069

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From: California

Quote:

Originally Posted by thomsbrain,Oct 24 2009, 12:19 PM

What I think is most interesting is that the cars made more power with the airbox off, since I always hear how taking it off DECREASES power. I guess the conventional wisdom is incorrect on that one, since both your cars showed clear increases in power in an objective test.

Oct 25, 2009 | 03:43 AM

#14

NNY S2k

Joined: Mar 2002

Posts: 25,651

Likes: 407

From: Plattsburgh, NY

Quote:

Originally Posted by bblanco22,Oct 24 2009, 08:06 AM

Thanks for reading, new to site as well.

Thanks for the post and welcome to the site.

Oct 25, 2009 | 05:51 AM

#15

siik_ap2

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Joined: Aug 2008

Posts: 1,793

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From: new joisey

Quote:

Originally Posted by jdm_dc_fan,Oct 25 2009, 01:19 AM

open air box = hot air intake.

agreed...especially from stop to stop..

Oct 25, 2009 | 05:57 AM

#16

Tony Torque

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Joined: Sep 2009

Posts: 69

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Yeah we put the air box lids on again. (i own the ap1 that was dyno"d)
Was happy with results on my ap1 hitting 200rwhp.
Got to admit vtec did sound pretty loud with the lid off.

Oct 25, 2009 | 09:52 AM

#17

thomsbrain

Joined: Apr 2009

Posts: 2,629

Likes: 42

From: Windsor, CA

Thanks for the replies on the box cover, I forgot about the heat issue. You'd be sucking nothing but post-radiator air, so it makes sense that in the real world it wouldn't work so well.

Oct 25, 2009 | 04:55 PM

#18

ahrmike

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Joined: Jul 2008

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Quote:

Originally Posted by GPWonTan,Oct 24 2009, 12:20 PM

Power, calculated from a engine (HP/KWtt) = function of RPM and Torque (made BY the engine @ that RPM), meaning the gears have no effect on HP.

On the contrary, you might lose HP due to the frictional losses which increase with more gearing...

The reason why you go "faster" is simply because you get into your powerband much sooner allowing you to stay in the sweet spot when youre racing - this is why after a certain speed gears will do nothing for you in a race, and on a road race course it might hinder you since you might have to make that extra shift.