I heard that wit a Gsr the 2 stage intake mani, best thing to do is upgrade.. For now Im stuck with the stock intake manifold with 2ndary butterflies... I was wondering is there a point I should set it at to get some better performance. I have type r cams, pr3 ecu chipped wit gsr/mugen fuel maps, 8600 rev limit, 5200 vtec engage, full exhaust no cat, FPR. The IAB is set to open around 5800... I was wondering if maybe I could up it more see if theres a difference.

 

Move vtec to about 5100 and set the butterflies at 5300..

 

actually im in the same situation.. through MY research ive come to the conclusion that a good setting for vtec engagement is 5300-5600. I dont think that changing the butterfly engagement (?) would change anything.. but of course, the only way to be sure. DYNO TUNE.

 

How exactly are you operating the butterflies with a PR3 ECU? Are you using a separate rpm activated switch?

 

VTEC Engagement that is heard, not felt with the 14111-P73-J00 and 14121-P73-J00 camshafts. The J01s may be different.
https://honda-tech.com/zero...51111

My butterflies are set to 5,600 RPM (stock). As with my VTEC engagement, the IAB engagement is heard, not felt.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALLMOTOR18 &raquo;</TD></TR><TR><TD CLASS="quote">Move vtec to about 5100 and set the butterflies at 5300.. </TD></TR></TABLE>



i am running a ctr intake cam on a otherwise stock gsr and my ecu does pretty much that. it definitely gives the oh-**** feeling as compared to the stock program

 

just got my vtec controller rockin today.. set them at 5300.. butt dyno tells me its about right... thats all i can afford right now

didnt hook up vtm line though.. thought id be okay.. 50 miles or so later, threw code 22..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dropdhatch217 &raquo;</TD></TR><TR><TD CLASS="quote">I have type r cams, pr3 ecu chipped wit gsr/mugen fuel maps, 8600 rev limit, 5200 vtec engage, full exhaust no cat, FPR. The IAB is set to open around 5800... I was wondering if maybe I could up it more see if theres a difference.</TD></TR></TABLE>

i've been considering this question myself. anyone have any dyno proof that the itr cams would make more midrange power if the iabs open earlier on the gsr. ie. before the stock 5750rpms? What about at the same time as vtec engages?

The itr intake manifold is obviously wide open when vtec engages in the itr engine.

d

 

i actually just removed the butterflies from my manifold all together.got it ported and polished and i was good to go.feel a little better responce in lower end

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by matto2413 &raquo;</TD></TR><TR><TD CLASS="quote">i actually just removed the butterflies from my manifold all together.got it ported and polished and i was good to go.feel a little better responce in lower end</TD></TR></TABLE>

you feel better lowend response with <U>no butterflies and the porting</U> over <U>no butterflies and no porting</U>?

d

 

i felt better response with the butterflies removed in general.And having it ported and polished problay helped alittle

 

Vtec is fine at 5200... set IAB's at 5400, but dynojet on my ride showed 6k was better for hp+tq (combined area). It just sounded/felt better at 5400, so i left it at that.

 

HELP PLEASE!!!....I have a 94 gsr head and the intake mani has the butterfly's....Im running a chipped p28 with gsr maps...my intake manifold doesnt have the lilttle black canister with the sensor....is the butterfly's opening??.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Surftouch &raquo;</TD></TR><TR><TD CLASS="quote">Im running a chipped p28 with gsr maps.......is the butterfly's opening??.....</TD></TR></TABLE>

nope...actually, they're not closing. they're open by default

d

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2G0S0R1 &raquo;</TD></TR><TR><TD CLASS="quote">Vtec is fine at 5200... set IAB's at 5400, but dynojet on my ride showed 6k was better for hp+tq (combined area). It just sounded/felt better at 5400, so i left it at that. </TD></TR></TABLE>

so you have an rpm switch to mess around with the different iab opening points?

d

 

How can i remove the butterflies.....will it affect my car in a way....what are the pros and cons....i keep hearing ppl telling me to take them off the stock manifold and i just dont know how i can remove them.

 

mine was done by a shop insurring that it was done correctly. alot of peopel hate gsr manifolds because of the whole butterflies. but to remove then all you have to is do it take off the manifold from the head. if ur looking at the manifold ull see that the manifold is 3 peices. front,back and theres like a middle plate, which are the butterflies.so pry away all 3 peices from each other. remove the middle plate, put a new gasket in, and then put together the front and the back peice together. theres no cons to removing them

 

many people have claimed losses btw 5-10 lbs of tq in the low-midrange from removing or disabling them.

mine currently run off a manual switch, so i can flip back and forth to test it. i'm certain i can feel the diff in the midrange. its not huge, but its there.

removing them completely should gain a few hp in the top end, but you will lose in the midrange, unless a tuner can tune the power back there. goodluck

d

 

yes i have an adj. switch for the IAB's. There was a loss of torque when i had them always open, and lots of people have agreed with me on this. Im sure a search would yeild some more answers.

If i could go back to not wasting my time i woulda just left it to the 5750 rpm of the P72... it was fine...

 

I dont understand how youd loose power. By removing the butterflies it more or less the same thing as buying a new blox or elderblock manifold. theres no butterflies in those. So the way that i see it, is by removing them u should actually gain power because youve increased the air flow.

 

Wrong... the dual stage manifold has longer runners when the butterflies are closed than a blox/S2... this benefits the torque curve. Pulling the IAB plate will not yeild the same gains as a single runner manifold swap. The entire GSR manifold was designed to work in a dual runner config and is not as efficient as a b16/ITR IM when disabled.

 

so ur saying that if i put my stock manifold back in, then ill actually be better? or just get an aftermarket manifold

 

better off to get an aftermarket one....

removing the butterflys creates an unusual path for the air to travel....


spend the $185shipped for an AEBS

 

it should be simple, the gsr mani is better for low/mid power, and the aftermarket one is better for high end and worse for low end.

the only real problem i can see is if the aftermarket manifold is overkill, and you don't gain any top end. It may be designed to work with more extensive mods and a higher redline.

d