Who has double stacked IAB's

[FDAccord]

You'll have less restriction and gain a significant amount of top end power.

At the cost of losing low/mid power

[quickangel93]

Yea, that would disrupt the hell out of the air flow.

actually no. the car accelerated like crazy.

[BB6-SH]

not to thread jack, but when you use one of these plates, do you need to use a gasket also?

yes u do.

[d112crzy]

actually no. the car accelerated like crazy.

actually no?

Did you somehow shrink yourself and put yourself inside the plenum to be able to see how the air flows?

There is air flow disruption, gains or not. If there were less, there'd be more power.

[quickangel93]

actually no?

Did you somehow shrink yourself and put yourself inside the plenum to be able to see how the air flows?

There is air flow disruption, gains or not. If there were less, there'd be more power.

ok then tell me why its disrupted. but the car acclerated faster than stock.

[bcjammerx]

butt dynos don't qualify as proof...sorry...I can argue from a psychological point that there were no gains...only in your head...
and you could argue there were...

only proof is flow test...but better...a dyno run

[d112crzy]

ok then tell me why its disrupted. but the car acclerated faster than stock.

Do you honestly need an explanation as to why it would disrupt air flow?

Take a look inside of a manifold and you'll know.

[MyCord]

This is the open spacer on top of the IM. This could possibly cause turbulence. The best way to go, in my opinion, would be to gut a stock IAB plate (leaving the holes the way they're) and plug the holes from the removed metal with JB weld or something. Or you could get an after market spacer like Blacktrax.


Explanation of why we have the IABs w/ 4 holes and why they open at higher rpm.

Two air intake paths are provided in the intake manifold to allow the selection of the intake path most favorable for a given engine speed. Satisfactory power performance is achieved by closing and opening the intake air bypass (IAB) controls valves. High torque at low RPM is achieved when the valves are closed, whereas high power at high RPM is achieved when the valves are opened.

Thanks to accordaffair for the quote straight from a Honda repair manual.

This is why having 4 open holes at all times would be bad, it would not benefit you until higher rpm, thus the purpose of the IAB plate.

IMO this is the proper spacer technique. Put a IM spacer under the IAB plate. It probably doesn't matter if it is under or above the IAB plate but it was dyno'd as being under. (and gained 5hp/5tq)


The a6 runners are shorter than the h23 runners and are thought to deliver better top end power than the h23 runners.

You can also get an special IM gasket from Bisimoto or Hondata that help lower air intake temperatures.

The best setup IMO would be:
h23TB/upper plenum
IAB plate
Blacktrax IMS
phenolic IM gasket
all new oem gaskets for the IM of course

Here are some helpful links:
h23 vs a6 runners:
http://www.cb7tuner.com/vbb/showthre...ht=h23+runners
Blacktrax IMS DIY
http://www.cb7tuner.com/vbb/showthread.php?t=90090
H series plenum on a6 runners DIY
http://www.cb7tuner.com/vbb/showthread.php?t=41175
H23 IM swap DIY
http://www.cb7tuner.com/vbb/showthread.php?t=16242
Blacktrax Dyno'd
http://www.cb7tuner.com/vbb/showthread.php?t=83042
Blacktrax site
http://www.blacktrax.net
Bisimoto site
http://www.bisimoto.com
Hondata site
http://www.hondata.com
a6 IM swap DIY
http://users.adelphia.net/~hagakure962/

Don't bash on me about facts, this is my opinion. Do your own research and make your own conclusions.

[quickangel93]

Do you honestly need an explanation as to why it would disrupt air flow?

Take a look inside of a manifold and you'll know.

yea. cus i took a look inside and all i see is aluminum pipes.