I've searched for answers to my question to no avail.

In the DPFI intake design you have a cover you can remove via 4 screws directly above the throttle body. It has PGM-FI printed on it. Now inside this passageway for air to enter the throttle body I see a screen over the throttle body and a plate of steel in the direct path of the incoming air.

I assume Honda knew what they were doing by adding these parts to the intake but does removing them help or hurt the performance of the engine.

It looks as if the plate is to stop the swirling of air. I thought swirling was good? Example. Aftermarket throttle body spacers with a helix

The screen looks like it is there to keep parts from falling inside.

Anybody ever do this and dyno the results?

 

i took that plate out but left the screen just incase somethin was to get in there somehow. I didnt really notice much a difference in power, maybe alittle. I dont knw for sure cuz ive never dynoed before. but it runs fine so. it did give either the exhaust or intake and kind of purring sounds like a subarus exhaust sounds i liked it so i left it haha

 

I took out the plate and the little v-plate in the DPFI box, leave the mesh though as it helps direct the air. To me, it made a noticeable difference especially if you run a short ram intake with the filter right on the DPFI housing. I took off my DPFI housing altogether and stuck straight 90 degree pipe going into the TB

Old picture of the setup:

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rayzian &raquo;</TD></TR><TR><TD CLASS="quote">



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That makes it look carbed, lol.

 

oh my god how many threads of this is there going to be? dont mod your dpfi its not worth it at all. you cant feel any gain from taking stuff out. just put in a mpfi intake and be done with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tippyman &raquo;</TD></TR><TR><TD CLASS="quote">That makes it look carbed, lol.</TD></TR></TABLE>

If I could find a round filter that would fit right ontop of it I'd do it.. give it that oldschool muscle look

maybe something like this? lol



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">oh my god how many threads of this is there going to be? dont mod your dpfi its not worth it at all. you cant feel any gain from taking stuff out. just put in a mpfi intake and be done with it.</TD></TR></TABLE>

word, I'm getting an LS put in but when you're bored and DPFI is all you have you might aswell mod it.. There is a gain to be felt although not a big gain, but a gain is a gain..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rayzian &raquo;</TD></TR><TR><TD CLASS="quote">I took out the plate and the little v-plate in the DPFI box, leave the mesh though as it helps direct the air. To me, it made a noticeable difference especially if you run a short ram intake with the filter right on the DPFI housing. I took off my DPFI housing altogether and stuck straight 90 degree pipe going into the TB

Old picture of the setup:




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lmao! if you want any kind of gain with dp i think that'd probably be the way to go!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">oh my god how many threads of this is there going to be? dont mod your dpfi its not worth it at all. you cant feel any gain from taking stuff out. just put in a mpfi intake and be done with it.</TD></TR></TABLE>


for real.

 

I just want to stick with DPFI cause I'm not turning this car into a race car. Just really wanted to have my car cause the mileage is good. MPFI uses more gas so I do not want to switch. If taking the plate out of my intake or adding a ram intake makes the gas and air mix more efficiently I would think I would get a small amount of mileage improvement as well as a very small HP improvement as long as I did not lean out the mixture by adding more air. If lean then I assume the ECU would adjust and add more fuel defeating the reason why I am going to do it.
No biggie really, I just should have stated I was not building a race car. Thanks for the pictures. They are a big help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4thgendxwi &raquo;</TD></TR><TR><TD CLASS="quote">I just want to stick with DPFI cause I'm not turning this car into a race car. Just really wanted to have my car cause the mileage is good. MPFI uses more gas so I do not want to switch. If taking the plate out of my intake or adding a ram intake makes the gas and air mix more efficiently I would think I would get a small amount of mileage improvement as well as a very small HP improvement as long as I did not lean out the mixture by adding more air. If lean then I assume the ECU would adjust and add more fuel defeating the reason why I am going to do it.
No biggie really, I just should have stated I was not building a race car. Thanks for the pictures. They are a big help. </TD></TR></TABLE>

Cool air &gt; hot engine bay heat

 

I've heard from several people that the mpfi is actually easier on gas, search it up.

 

I did a M.P.F.I. swap on my D15B2 in my 90 hatch and now I get around 30-35 m.p.g.!!!
Thats just driving like I always have.The best part is for an everyday driver you can't beat the practicality of saving gas and picking up a little h.p. to boot

 

I usually get about 38mpg with a combination of highway miles and city miles. Is it just so good because I have dpfi and the car has no cat in the exhaust?

 

I get 38 mpg on my 91 civic std. No mods or upgrades.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deanh8 &raquo;</TD></TR><TR><TD CLASS="quote">Cool air &gt; hot engine bay heat </TD></TR></TABLE>

Yeah, maybe if you had 4 injectors and a motor that can actually suck air. With DPFI having a cold air restricts so much flow it's not even funny. My **** has a wider diameter than a DPFI TB.. I've had a cool air intake (that goes behind the battery, not a true cold air) and I lost all throttle response possible with possibly a slight gain @ 6000 rpm.. which I rarely if ever hit either due to it taking too long to get there (lol) or in fear of breaking something..

Oh yeah, plus you get better MPG with hotter air.


Modified by rayzian at 12:45 PM 11/7/2006

 

this thread sucks, and dpfi doesnt suck enough. just dont touch it. iv tried all those little tricks,taking the v plate out, putting on ram air. does not give you any gain that you can feel. you lose bottom end power anyways and as the last guy said you wont want the power being added att he top because it takes to long to get there and you might break something.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rayzian &raquo;</TD></TR><TR><TD CLASS="quote">I took out the plate and the little v-plate in the DPFI box, leave the mesh though as it helps direct the air. To me, it made a noticeable difference especially if you run a short ram intake with the filter right on the DPFI housing. I took off my DPFI housing altogether and stuck straight 90 degree pipe going into the TB

Old picture of the setup:



never thought of that. It's pretty sweet.


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