So, from my understand a short intake design yeilds better low RPM responce and longer intake helps higher RPM power.

So what If I were to have a true cold air intake but at the bend at the throttle body have a short ram type design venture off with a electronicly controlled divider. So I could make it so the car up untill 3,000rpms use the shorter intake and once it hits 3,000 close the Short intake and open the true cold air to bring in fresh cold air from the longer CAI.


This way you may not get the coldest air possible for lower RPMS but you would get a quicker inlet of air from to the engine and as the engine builds up in rpm switch to CAI to get the higher RPM power with the colder air.

This seems a best of both worlds. I would use a electronic servo connected to a butterfly type thing set up so as soon as you approach the targeted rpms it starts to switch the airflow from the basicly short ram to CAI.

What do you guys think? Am I crazy and wrong on my logics.
You may say it's a waste of time and show no real gains but I'm not concerned with actual number gains. I'm concerned with drivable differences in responce and power. And I have plenty of time on my hands so why not?

 

I say why? The engine is already varying air volume & velocity (on VTEC models) and I dont think you'd be able to generate the pressure like a turbine can with a servo-operated baffle.

Suzuki uses a system like this in their motorcycles (did through the late 90's-early 00's at least) and the dyno-proven fact is that all the baffle does is restricts airflow at higher RPM. More power could be made by removing any potential restriction in the intake at a very small loss (<1%) in the lower end(<4000rpm).

But if you have the time then go for it

 

Do you know what the IABs are in the intake manifold?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hawkze_2.3 &raquo;</TD></TR><TR><TD CLASS="quote">Do you know what the IABs are in the intake manifold?</TD></TR></TABLE>

 

this is interesting, i wanna see it done and dyno tested. only way to really tell if there is any change. sounds kinda stupid, but makes sense when you think about it. i say go for it if you want, but you better dyno it to prove any gains.

 

Horrible idea and I think room would be a problem.

 

I think for the price to make such a device to the power you would gain... is not worth the effort. There are already similar measures in place.

 

The money you are spending to gain 1whp is insane. You cannot feel little differences like that, its all in your head.

 

Well this is a 1991 Honda prelude SI ALB B21 so there is no vtec in sight haha

Well I'm making my own CAI, and I can pretty much make a mockup without paying for anything really.

Beyond that I think you guys are missing the point. Yes there is already something like this in place at the intake and that is to distribute the incoming air period.

This is before the throttle body, so that there is no lag in throttle responce waiting for air to reach a good flow down the in my case pretty long CAI piping, The lower RPMS would get an instant shot high flowing air from the Short ram design and then cross over to the CAI in higher RPMs. People complain of the lesser throttle response and lag with the long cold air intakes. Cold air intakes will show greater power on a dyno no matter what, but short rams have been said to give better throttle response from a stop. So this would lessen the compromise giving you the best of both worlds that would ultimatly add very little weight.

Keep in mind this is BEFORE throttle body air flow we are talking about, the air has maybe a foot of distance to travel from filter to TB on short ram, And about 4 feet of distance with CAI. I know with my experimenting I get a hell of a lot better throttle response with Short ram, I have an automatic and it turns the tires with short ram, and maybe squeeks while turning with CAI.

 

Like a screen door for a submarine..
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hawkze_2.3 &raquo;</TD></TR><TR><TD CLASS="quote">Do you know what the IABs are in the intake manifold?</TD></TR></TABLE>

x3

This idea would be more trouble than the gains.. plus the added weight and electronics would be a pita. My guess is that the crossover point when it goes from CAI to short ram would end up loosing power or not be able to overcome the vacume created by the motor.. in which case you might starve your motor of air. This idea is up there with whats his nuts who invented the electric superturbo intake mod..

 

short ram is for high end power, cold air is for low end....first off.

second, honestly it is not a good idea, on an exhaust system it works because the less back pressure there is the better so when an electric cut out is used it basically bypasses the cat converter and muffler and just comes straight out from the header collector. switching from short ram to cold air or vice versa will not do any good, all it would do is change the sound.

 

haha it seems kinda cool on paper, but i think the construction of the valve would restrict the airflow somewhat, to the point of negating any gains.

 

Hey this is a super good idea. You should try it!

I have a 3" E-Cutout sitting here I'll sell you for 180$ shipped -need to get rid of it! Would be so pimp if you could drive with your friends and hit that cutout and BAM spin the tires to third in that automatic!

 

i gots and idea. take this idea and add it to the dual throttle bodies idea... 1 tb for the ram air 1 for the cold air lol

 

skip the intake and get the electronic cutout for your exhaust