INTAKE MANIFOLD butterfly delete
#1
Three Wheelin'
Thread Starter
INTAKE MANIFOLD butterfly delete
So, my IMRC went bad, so I thought i would try something before buying a new one.
I removed the plug going into it, then opened the intake manifold and removed the butterflies completely out of the intake manifold.
i have driven the car and i see no torque loss, and the rpms gain quicker.
Obviously it is hard to say right now if it is just better than the bad IMRC or if it is better than ever, but all i know is that I have no complaints with them out.
I wonder if i should leave the plug undone or plug it back in even though the butterflies are out?
I removed the plug going into it, then opened the intake manifold and removed the butterflies completely out of the intake manifold.
i have driven the car and i see no torque loss, and the rpms gain quicker.
Obviously it is hard to say right now if it is just better than the bad IMRC or if it is better than ever, but all i know is that I have no complaints with them out.
I wonder if i should leave the plug undone or plug it back in even though the butterflies are out?
#2
Senior Moderator
So, my IMRC went bad, so I thought i would try something before buying a new one.
I removed the plug going into it, then opened the intake manifold and removed the butterflies completely out of the intake manifold.
i have driven the car and i see no torque loss, and the rpms gain quicker.
Obviously it is hard to say right now if it is just better than the bad IMRC or if it is better than ever, but all i know is that I have no complaints with them out.
I wonder if i should leave the plug undone or plug it back in even though the butterflies are out?
I removed the plug going into it, then opened the intake manifold and removed the butterflies completely out of the intake manifold.
i have driven the car and i see no torque loss, and the rpms gain quicker.
Obviously it is hard to say right now if it is just better than the bad IMRC or if it is better than ever, but all i know is that I have no complaints with them out.
I wonder if i should leave the plug undone or plug it back in even though the butterflies are out?
#3
Three Wheelin'
When mine went out I just pinned it open with a zip tie. I did not like the loss at high rpm, thats why I pinned it open. But I could tell the loss at the low end. I left it that way for a few weeks until i got a new one from Acura.
I would plug it back in if I were you. Just for the fact that you dont want a bunch of dirt in the plug end. Other then that I dont see why it would hurt anything.
I would plug it back in if I were you. Just for the fact that you dont want a bunch of dirt in the plug end. Other then that I dont see why it would hurt anything.
#4
Whats up with RDX owners?
iTrader: (9)
The reason you feel as though it added power was because its now open, not stuck closed throughout the whole rev range.
Its been dyno proven that you do lose torque down low with it open.
Its been dyno proven that you do lose torque down low with it open.
#5
Three Wheelin'
Thread Starter
Now after driving it more tonight, i seem to see a difference in the 2500-3500rpm range in like 2nd and 3rd, but other than that, it pulls pretty good.
feel it or not you WILL loose low end torque period !
type-r, are you mad?...lol
thanks guys
#6
Senior Moderator
oh i know. I haven't seen the thread, but i realize that from being on here enough. I was just stating that it wasnt significant enough for me to really notice.
Now after driving it more tonight, i seem to see a difference in the 2500-3500rpm range in like 2nd and 3rd, but other than that, it pulls pretty good.
feel it or not you WILL loose low end torque period !
type-r, are you mad?...lol
thanks guys
Now after driving it more tonight, i seem to see a difference in the 2500-3500rpm range in like 2nd and 3rd, but other than that, it pulls pretty good.
feel it or not you WILL loose low end torque period !
type-r, are you mad?...lol
thanks guys
#7
Three Wheelin'
Thread Starter
lol no why would u think that ? main thing is i dont want you or anyone else to think this is a good thing ...btw if ur handy you can possibly fix ur acctuator ... i did ... first couple teeth were just broken off ... shimmed it till it grabbed ... another way u could do this is to adjust ur cable so as to achieve the same thing
so its really that bad to leave these butterflies out huh?
its so hard to really see any difference cause my car in the past 2-3 months seems to have lost its torque and acceleration anyways. im really getting concerned that either my clutch or flywheel is bad or my car is just loosing horsepower somewhere because it seemed to be quicker without any mods...
maybe a valve adjustment is needed????
oh well, another topic...lol
thanks man
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#8
Senior Moderator
yes i am, and i was actually thinking of doing that today.
so its really that bad to leave these butterflies out huh?
its so hard to really see any difference cause my car in the past 2-3 months seems to have lost its torque and acceleration anyways. im really getting concerned that either my clutch or flywheel is bad or my car is just loosing horsepower somewhere because it seemed to be quicker without any mods...
maybe a valve adjustment is needed????
oh well, another topic...lol
thanks man
so its really that bad to leave these butterflies out huh?
its so hard to really see any difference cause my car in the past 2-3 months seems to have lost its torque and acceleration anyways. im really getting concerned that either my clutch or flywheel is bad or my car is just loosing horsepower somewhere because it seemed to be quicker without any mods...
maybe a valve adjustment is needed????
oh well, another topic...lol
thanks man
#9
If you really want answers on this speak too p2r. If you ask on here it will all be negative responses. It all depends on how ur car is setup and how you want to use it really, in your case id say leave it on.
#10
Three Wheelin'
Thread Starter
appreciate it..
i plan on most likely replacing it and putting the butterflies back in, just wanted to see how it is without it and i dont have any complaints.
anyways, isnt there horsepower gains but torque loss down low? that is the same thing with most of the breather mods on this car.
im looking to achieve the 260hp/230lb to the wheels though.
Headers and pullies are next on the list
i plan on most likely replacing it and putting the butterflies back in, just wanted to see how it is without it and i dont have any complaints.
anyways, isnt there horsepower gains but torque loss down low? that is the same thing with most of the breather mods on this car.
im looking to achieve the 260hp/230lb to the wheels though.
Headers and pullies are next on the list
#11
Breather mods should increase both hp and tq, not just 1 to sacrifice other. Butterfly delete isn't a breather mod really, it is just a flap that opens up. It is also designed with a stock motor in mind. I don't know if p2r saw gains or if it is just one more thing that can malfunction on a race car so they did without it(plus cheaper to not use and lighter).
#13
I got the Shifts
iTrader: (5)
Breather mods should increase both hp and tq, not just 1 to sacrifice other. Butterfly delete isn't a breather mod really, it is just a flap that opens up. It is also designed with a stock motor in mind. I don't know if p2r saw gains or if it is just one more thing that can malfunction on a race car so they did without it(plus cheaper to not use and lighter).
Having it non-working makes it "lose" power up top. This doesn't actually give any power gains if you are removing a perfectly functioning part on a stock ecu vehicle.
#15
I got the Shifts
iTrader: (5)
as you can see i either need to get the type-s ECU or get a tune because my car gets extremely rich (almost 9 afr) around 3.5-5k rpm. im leaning torward a tune with AEM fic so that i can use the FIC for my turbo kit down the road.
infos
Run 2 was with the IMRC stuck closed
run 3 was with the IMRC stuck open again
Run 4 was with the IMRC working
pulled 243.5 HP and 204 FT-lbs of tq with the tl-p ecu. at 88% humidity and 89 degrees outside.
not bad considering i only have intake, and headers.
tuner said i should see 260-270 with a pulley, exhaust (i still have a tl-p exhaust) and a tune with AFC neo or AEM FIC
https://acurazine.com/forums/newrepl...ply&p=11214852
#16
Lives in Boost
Wow, a 13hp loss from a non functioning IMRC. Makes me want to yank mine out now since mine has been closed since I got the blower but I know that wouldn't be a good idea...
#18
Lives in Boost
I think it would be similar. The airflow is still being restricted while the IMRC is closed even though its being forced in there. I really need to get off my azz and get this stuff done so I can find out
#20
Three Wheelin'
Thread Starter
i agree with keeping the imrc on, im sure Acura did this for a reason.
it just is always gonna be a problem, and my car runs great with it off right now...just sayin..lol
it just is always gonna be a problem, and my car runs great with it off right now...just sayin..lol
#21
Three Wheelin'
Thread Starter
is that 10whp and 20lbft loss between 3500-4500 rpm?
damn thats a lot but it comes back to basically even.
guess i need to get my shit working again...lol
damn thats a lot but it comes back to basically even.
guess i need to get my shit working again...lol
#22
Noone is denying why Acura did it. It is whether a non-stock engine that is pnp'd is better off with or without it, once you change the airflow patterns of the engine.
#23
Senior Moderator
i was about as non stock as you get ... and this i assure you... pinned shut i lost significant hi end hp/lb.ft. ...pinned open i lost similarly equal hp/lb.ft. down low ...
#24
Three Wheelin'
Thread Starter
i would love to go and see your car run brother...lmk
my NEW imrc will be back on when i finish doing the back three spark plugs this weekend....
#25
Three Wheelin'
Thread Starter
found the Imrc actuator motor on the black market for $50 new!!!
it is for 01-03 automatic, but arent they all the same for our car?
please let me know asap so i can get it!!!
it is for 01-03 automatic, but arent they all the same for our car?
please let me know asap so i can get it!!!
#26
Three Wheelin'
Thread Starter
i believe this is the part # and it is universal to both trannys
17151-PFW-J02
17151-PFW-J02
Last edited by AARONSredTYPE-S; 03-30-2011 at 10:09 PM.
#27
Three Wheelin'
When I ordered mine from Pikes Peak Acura I don't remember them asking about the tranny. Then again maybe thew just knew since it was an 01. I dont see why there would be any diff at all.
#30
Three Wheelin'
Thread Starter
Well, the new actuator broke in my hands cause its a cheap pos, but i fixed the old one hopefully and now its working along with my rear e3 spark plugs.
Xs headers will be installed next weekend, then the track again...oh yeah...lol
Xs headers will be installed next weekend, then the track again...oh yeah...lol
#32
Three Wheelin'
Thread Starter
FUNNY..
Hopefully the one i have lasts, but i really dont feel a difference at all with it back on and working..i guess it will take the ecu a few days to straighten everything back out..
oh well, proof is in the dyno
Hopefully the one i have lasts, but i really dont feel a difference at all with it back on and working..i guess it will take the ecu a few days to straighten everything back out..
oh well, proof is in the dyno
#33
All motor
I have to resurrect this thread. Reason being: Reese. He is the only one that has proof of his 103-104mph traps and is one of the only ones that has the butterfly delete. He has a ported intake manifold and runners as well. He didn't seem to lose any low end torque with his 82-83mph traps in the 1/8th. So I have to question this, because my traps are low considering my mods.
Being that he is the only one producing traps near 104mph, I have to assume that this mod really works. With 82-83mph traps in the 1/8th, he couldn't have possibly lost any low end. Those are near 370z 1/8th traps. Anyone have any insight on this?
Being that he is the only one producing traps near 104mph, I have to assume that this mod really works. With 82-83mph traps in the 1/8th, he couldn't have possibly lost any low end. Those are near 370z 1/8th traps. Anyone have any insight on this?
#35
I removed mine but also did other mods. Car feels stronger at every rpm level. I can still spin tires in 1st and 2nd gear. The only torque loss is below 2500 rpm and I keep revs above that. I dont see this affecting drag times. It would be more like if you are driving slow at 2k rpm then try to gun it.
#36
All motor
^^ What other mods? I have a ported IM so I figured I might as well try this. If they don't work I can always put them back in, doesn't seem too tough or time consuming.
#37
Other mods I did was valve adjustment, 08 tl-s exhaust valve springs, p2r tb spacer, p2r thermal gaskets, p2r plenums, 01 mdx intake horns, ported runners & IM, bored tb, IMRC and air assist to runner delete.
Other mods I've had done include underdrive pulley, comptech icebox, xlr8 cat, comptech headers.
The only other things would be to get custom headers made, custom exhaust and tune. If that isn't enough power for you then do the 3.6 build, nitrous, turbo or s/c.
I did my build based on the lack of tuning. I didn't want to deal with headache of tuning s/c or turbo. I personally am not a fan of nitrous. I also don't wanna be guinea pig in figuring out how to get aem ems to work. With weight reduction I think I will be happy with it.
Last edited by brian6speed; 11-01-2011 at 04:06 PM.
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