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Old 06-08-2001, 09:13 AM   #1
lucien2
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Question Another JC Intake Q

Over on the Edmunds board we have been debating the need for the torque chamber, the big bog that sits on top of the intake manifold. The argument goes that this is a reservoir of clean, post-filter air that the engine needs for sudden throttle input, so that it isn't starved for clean air before the filter can catch up. Sounds reasonable to me, and I have had hesitation down low in quick, gotta-get-accross-the-intersection- type throttle inputs.

SOOOO....I put the stock intake back together with the torque chamber, but re-attached the JC filter/MAF assemble to the arm that comes out of the box. My butt dyno says I have lost some throttle response at the expense of marginal low-end gain. And I lost the kewl growl too. Now I don't know what to think...butt dynos are none to accurate, and I am now confused as to what the ideal setup should be on the GT. Any input?
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Old 06-08-2001, 10:17 AM   #2
MY99 2.5GT
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I have problems with low rpm launches also. My car boggs very easy. I have a Weapon R Hyper intake thats very similar to your JC Sports. In order to get immediate power and a good launch I have to rev it up and slipp the clutch. My clutch engages nicely so its not an issue with that. Its almost like it doesn't have enough air readily available for it to make power that low.

Brad
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Old 06-08-2001, 10:21 AM   #3
lucien2
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back from a longer test drive....I am getting better low end pull now for sure. I also lost a little throttle response, and the great sound. Oh well. not sure I wanna go through the hassle of putting the JC back on.
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Old 06-08-2001, 07:59 PM   #4
GTBGUY
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'98 QS Legacy L (auto)

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You'll notice that your car doesn't rev as fast anymore. I did some imperical experimentation with that as well, but noticed with only the Filter and the OEM intake, the car still ran out of breath around 6000rpm's. You'll also notice a "whining" sound from constructive interferrance resonance.
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Old 06-09-2001, 01:40 PM   #5
lucien2
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GTBGuy, what set up did you end up settling on? Got that whining allright. And it doesn't rev as fast, but does get low end torque back. Hmmm.....how to get both ?
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Old 06-09-2001, 02:01 PM   #6
GTBGUY
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Well, I solved that problem on my GT with going turbo! On my '98 Legacy L however, I have the JCS intake on, but I also custom designed a CAI portion to adapt to the intake, I gained back the little bit of torque, but still have lots of high-end, not to mention great fuel mileage
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Old 06-09-2001, 02:16 PM   #7
lucien2
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dammit, I'm in the wrong line of work.
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Old 06-09-2001, 03:35 PM   #8
Benjamin Tang
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everybody who thinks gtbguy is too rich for his own good please raise their hand

ben
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Old 06-09-2001, 06:24 PM   #9
GTBGUY
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Ben - If I was too rich for my own good, I'd be driving Porsches, Ferrari's etc all day! *I totally wish!*... anyways, there's only 3 cars in this 4 person family (my 2 parents and my younger brother).... unfortunately I had to sell my beloved Civic Hybrid... or else we would have 4 cars!

All I have to say is that I love cars!
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Old 06-10-2001, 02:34 PM   #10
gavin
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You need that reservoir there in order to take full advantage of the engine's scavenging design.

In a nutshell, there's a period of time in the exhaust stroke where both the intake valve, and the exaust valve, are open. The exiting exhaust forms a vacuum at the exhaust valve, which draws air/fuel into the cylinder for the next detonation. That's how a small engine is able to maintain torque at low RPM's.
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Old 06-11-2001, 11:17 AM   #11
lucien2
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Hmmm...o.k., so I'll leave that on. I guess I could make a shorter arm from the reservoir to the MAF/Cone filter assembly...but I don't know if I'd get my revs back doing that or not.
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