Reminder to S/C'ed Owners!!!!!!!
#1
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Reminder to S/C'ed Owners!!!!!!!
Tonight I received a phone call from a forum member telling me their short block will need replaced. Cylinder #4 is toast.
This is the 3rd instance I have personally heard this story! The common denominator in all 3 stories is they all had the IMRC connected for an extended period of time (think thousands of miles) while using the high boost pulley.
If you're running the high boost pulley please please PLEASE! disconnect your IMRC! A new short block is not a cheap purchase and certainly one you do not want to make.
This is the 3rd instance I have personally heard this story! The common denominator in all 3 stories is they all had the IMRC connected for an extended period of time (think thousands of miles) while using the high boost pulley.
If you're running the high boost pulley please please PLEASE! disconnect your IMRC! A new short block is not a cheap purchase and certainly one you do not want to make.
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Just checked my car....couldn't find the IRMC (might have just taken it off?), but I did see the plug hanging there so all is good. Thanks for the reminder. Clinton
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#8
Blown is Best
Originally Posted by ThinJim
I was getting a quick lean spot during the imrc engagement, i upped the duty cycle just prior to it engageing and took care of it. perhaps those with the HBP without emanage might consider doing the emanage route.
Boomslang Harness & E-Manage
http://www.boomslang.us/emanage.htm
#9
Suzuka Master
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Originally Posted by Allout
That's what I've decided to do since I'm in CA with 91 octane. I get occasional detonation with the standard boost pulley right before VTEC changeover.
Boomslang Harness & E-Manage
http://www.boomslang.us/emanage.htm
Boomslang Harness & E-Manage
http://www.boomslang.us/emanage.htm
i bought a boomslang harness, not for emanage, but for afc, and the work is outstanding, and they sent it out in only a couple days. you won't be disappointed.
#10
Racer
I have the standard boost pulley on mine... Is the general thought to disconnect the IMRC even with the standard pulley. I live on the east coast where 93 octane is commonly accessible. I had a slight bit of detonation, but nothing extremely noticeable.
#12
Moderator Alumnus
Originally Posted by CleanCL
so is the IMRC charge causing silent detonation? i dont really get it. has there been a dyno before/after of IMRC opening/closing? just curious. didnt know the IMRC could fry a cylinder. wat exactly happened? rings/pistons?
#16
Suzuka Master
Originally Posted by rongotti
UMMMMMMMMMMMMMMMMMMM how about in english for the noobs? lol I have no idea whats going on!
CEL?
AFC?
IMRC?
High boost pulley?
Thanks
CEL?
AFC?
IMRC?
High boost pulley?
Thanks
AFC=Air Fuel Controller
IMRC=Intake Manifold Runner Controller (opens up the plate that seperates the upper intake manifold down the middle)
High boost pulley only is for supercharged guys. Name kinda speaks for itself.
#18
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The opening of the IMRC adds a significant amount of air into the intake. With the supercharger many of us were experiencing "ping" right around 5,000rpm where the motor starts to run lean. When it runs lean and begins to knock the ECU starts to kill timing. So any potential gains due to the increased air with the IMRC connected is negated by the ECU interfering by playing with timing.
Disconnecting the IMRC limits the amount of air entering the intake but the AFR stays flat (for the most part) and there's no interference by the ECU playing with timing due to knock. Eliminating the knock also saves the motor.
Disconnecting the IMRC limits the amount of air entering the intake but the AFR stays flat (for the most part) and there's no interference by the ECU playing with timing due to knock. Eliminating the knock also saves the motor.
#20
Blown is Best
Originally Posted by CleanCL
i bought a boomslang harness, not for emanage, but for afc, and the work is outstanding, and they sent it out in only a couple days. you won't be disappointed.
#21
Blown is Best
Originally Posted by CleanCL
it won't throw a CEL.
the thing is.. i would only assume VTEC changeover to have a stronger effect of detonation than the imrc would, i would just like to know the diagnosis of why cyl 4 failed.
the thing is.. i would only assume VTEC changeover to have a stronger effect of detonation than the imrc would, i would just like to know the diagnosis of why cyl 4 failed.
#22
Blown is Best
Originally Posted by Paclark01
I have the standard boost pulley on mine... Is the general thought to disconnect the IMRC even with the standard pulley. I live on the east coast where 93 octane is commonly accessible. I had a slight bit of detonation, but nothing extremely noticeable.
#24
Blown is Best
Originally Posted by CL FWD SPEED
Im running standard pulley w/ 93 octane. On vtec changeover haven't had any issue, do i still need to unplug the IMRC?
#25
Originally Posted by mclarenf3387
CEL=Check Engine Light
AFC=Air Fuel Controller
IMRC=Intake Manifold Runner Controller (opens up the plate that seperates the upper intake manifold down the middle)
High boost pulley only is for supercharged guys. Name kinda speaks for itself.
AFC=Air Fuel Controller
IMRC=Intake Manifold Runner Controller (opens up the plate that seperates the upper intake manifold down the middle)
High boost pulley only is for supercharged guys. Name kinda speaks for itself.
#26
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Originally Posted by Allout
I would say no. There are benefits to having the IMRC plugged in. If you don't get detonation or pinging, you should be fine.
The "resonance" effect created by the dual stage intake manifold is relying on vacuum. Once we introduce positive atmospheric pressure into the manifold the resonance effect is greatly reduced or eliminated all together.
It's based on the Helmholtz resonance theory. Although back in 1860 I don't think he knew it would be applied to a Honda J32A2.
#27
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The reason why we don't experience detonation at the VTEC engagement is because the ECU automatically compensates for the VTEC engagement by ramping up the fuel a LOT just prior to engagement. If you've ever played with a AFC type piggy-back on this car (UniChip or eManage) you'll see what I mean.
#29
Three Wheelin'
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Originally Posted by mrsteve
The opening of the IMRC adds a significant amount of air into the intake. With the supercharger many of us were experiencing "ping" right around 5,000rpm where the motor starts to run lean. When it runs lean and begins to knock the ECU starts to kill timing. So any potential gains due to the increased air with the IMRC connected is negated by the ECU interfering by playing with timing.
Disconnecting the IMRC limits the amount of air entering the intake but the AFR stays flat (for the most part) and there's no interference by the ECU playing with timing due to knock. Eliminating the knock also saves the motor.
Disconnecting the IMRC limits the amount of air entering the intake but the AFR stays flat (for the most part) and there's no interference by the ECU playing with timing due to knock. Eliminating the knock also saves the motor.
Yes, the computer does compensate with vtec changover and probabley IMRC engagement as well. However, the adjustment to the IMRC seems to be enough for up to 4.5 -5psi. The puter was mapped for atmosphere engagement of the IMRCand theres always a little fudgefactor.
As for the IMRC not making a difference, I beg to differ. At 6psi I saw roughly 20hp difference between being open and closed. It causes a ramming effect and if it's not open, you lose that ram effect.
If you want to monitor knock, go here http://www.linkecu.com/products/Anci...ices/KnockLink
simple to install and is better than listening for it, the motor wot gets loud
#30
Blown is Best
Originally Posted by mrsteve
There really are no benefits of leaving the IMRC connected once you are boosted.
The "resonance" effect created by the dual stage intake manifold is relying on vacuum. Once we introduce positive atmospheric pressure into the manifold the resonance effect is greatly reduced or eliminated all together.
It's based on the Helmholtz resonance theory. Although back in 1860 I don't think he knew it would be applied to a Honda J32A2.
The "resonance" effect created by the dual stage intake manifold is relying on vacuum. Once we introduce positive atmospheric pressure into the manifold the resonance effect is greatly reduced or eliminated all together.
It's based on the Helmholtz resonance theory. Although back in 1860 I don't think he knew it would be applied to a Honda J32A2.
#31
Blown is Best
Originally Posted by ThinJim
If you want to monitor knock, go here http://www.linkecu.com/products/Anci...ices/KnockLink
simple to install and is better than listening for it, the motor wot gets loud
simple to install and is better than listening for it, the motor wot gets loud
#34
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Originally Posted by Allout
I just looked up your Dyno
https://acurazine.com/forums/showthread.php?t=181821
https://acurazine.com/forums/showthread.php?t=181821
The adjustment on the FPR would be my hypothesis as to why the great difference in power was made there. The car runs at about the same AFR up until VTEC where it remains around 12.0:1. I wouldn't want to go much leaner than that.
#35
THE J35A2...
IMRC function is to put up more air between 3500RPM-4000RPM was put there to help out SOHC to perform better, having it connected while boosting more than 6psi will create turbulence (tornado like...) inside the manifold and could messed up the a/f mixture (lean=less fuel/more air and rich=less air/more fuel) i guess that's why Comptech went on a safe side and didn't advertised HB pulley. 6+psi boost can come as early as 3000RPM. However, running more than 6psi can feel some significant changes around 3500RPM-3800RPM (disconnected) in normal driving, which explain the lack of "uumph!" on that area even @ WOT. e-manage and other air/fuel management/controller can correct "most" of that problem...
i myself experience some knocking/pinging at WOT, using 91octane. but nothing occurs when i mixed it up w/ 5 gal of 100octane. but i doubt...
how accurate is this knocklink monitor? where did you hook it up? wideband AFR gauge doesn't help?
i'm no guru and i still yet to learn more about J32A2 engine, so correct me if i'm wrong on my opinion.
i myself experience some knocking/pinging at WOT, using 91octane. but nothing occurs when i mixed it up w/ 5 gal of 100octane. but i doubt...
how accurate is this knocklink monitor? where did you hook it up? wideband AFR gauge doesn't help?
i'm no guru and i still yet to learn more about J32A2 engine, so correct me if i'm wrong on my opinion.
#36
Three Wheelin'
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Originally Posted by SIRSIG
IMRC
how accurate is this knocklink monitor? where did you hook it up? wideband AFR gauge doesn't help?
i'm no guru and i still yet to learn more about J32A2 engine, so correct me if i'm wrong on my opinion.
how accurate is this knocklink monitor? where did you hook it up? wideband AFR gauge doesn't help?
i'm no guru and i still yet to learn more about J32A2 engine, so correct me if i'm wrong on my opinion.
#37
THE J35A2...
that's what scares me. the silent assassins. this monitoring device might help, but what can i do if det is present? also can you explain it briefly what det and ping?
#38
Three Wheelin'
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Originally Posted by SIRSIG
that's what scares me. the silent assassins. this monitoring device might help, but what can i do if det is present? also can you explain it briefly what det and ping?
Detonation occurs when the air fuel mixture doesn't ignite evenly, a good burn starts at the spark plug and work it's way out smoothly, det happens when the the mixture just explodes rather than the slower burn. Both are damaging.
#39
4drs just wanna have fun!
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Seems that this information is still relevant today.
I think the IMRC is okay no matter what with proper tuning using a piggyback like the Greddy Emanage or better. I would also think that the IMRC opening up would lower boost levels a little due to the extra volume now provided.
I think the IMRC is okay no matter what with proper tuning using a piggyback like the Greddy Emanage or better. I would also think that the IMRC opening up would lower boost levels a little due to the extra volume now provided.
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Originally Posted by Accord_V6_400m
Seems that this information is still relevant today.
I think the IMRC is okay no matter what with proper tuning using a piggyback like the Greddy Emanage or better. I would also think that the IMRC opening up would lower boost levels a little due to the extra volume now provided.
I think the IMRC is okay no matter what with proper tuning using a piggyback like the Greddy Emanage or better. I would also think that the IMRC opening up would lower boost levels a little due to the extra volume now provided.
The effect of opening the runners increases the volume which is supposed to slow down the airflow and thus increase density (increase "boost") which is why we see problems with the HBP and IMRC.