Who has double stacked IAB's

[zigg_1311]

I just got my h23 intake manifold, and i thinking about just swapping the whole thing, and taking my iab plate from my a6 and putting it underneath my h23 iab's. I would like know who has done the double stacked iabs, and if they actually felt a difference in the increased runnner volume.

[CB7lx91]

stack two functioning iab plates or two gutted or what? I'm guessing at leats one of them is gutted, cuz I don't know of any gains made by that. But don't quote me on this, but It actually increases plenum volume, not runner length.

[zigg_1311]

i am saying have one of the iab's hooked up, and then have the other set open all of the time. I want to see if anybody has done this at all, if not i think i am going to do it, and give it a try

[accordztech]

dont seem differnt to me, ur just creating a little more velocity....id just delete one IAB and the other one make it funtion, ur going to need longer bolts though...hopefully it will clear the engine.

[bcjammerx]

how would this be an improvement?

[d112crzy]

stack two functioning iab plates or two gutted or what? I'm guessing at leats one of them is gutted, cuz I don't know of any gains made by that. But don't quote me on this, but It actually increases plenum volume, not runner length.

Wrong.

By double stacking the plates, you are making the runners longer, not a bigger plenum.

If you double stack 2 IAB plates, you will have to remove the butterflies from whichever one, and plug up the holes with something.

This is essentially the same as using one of those blacktrax spacers on top or under neath the stock IAB plate. Except, the blacktrax spacer isn't as restrictive as the iab plates.

[CB7lx91]

sorry I was talking about a totally gutted iab plate. Like the picture below:

If you did it that way, it'd technically increase plenum volume...right?

[JohnD1079]

now i dont know anything about this at all. But wouldnt that just mess up the air flow bath?

Like wouldnt it be going through smoothly and then when it hits that point, i would just all clobber up and screw up the pattern?

[BB6-SH]

sorry I was talking about a totally gutted iab plate. Like the picture below:

If you did it that way, it'd technically increase plenum volume...right?

read what d112crzy said, also u would want the spacer to match the ports

[d112crzy]

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

[CB7lx91]

so then what's the point of adding the spacer if all it's going to do is mess up the air flow?

[d112crzy]

so then what's the point of adding the spacer if all it's going to do is mess up the air flow?

That depends on where you put the spacer.

You can put it under the IAB plate. Just like shown in this thread
http://www.cb7tuner.com/vbb/showthre...ight=blacktrax

OR, if you want more top end power, get 2 spacers and eliminate the IAB plate completely. You'll have less restriction and gain a significant amount of top end power.

[CB7lx91]

oh, so either under the iab plate, or just eliminate it completely. That makes sense actually. Thanks dude

[quickangel93]

how would this be an improvement?

well if you delete one set of plates either from the a6 or h, than you extending the intake manifold, which then i can hold more air. that make a bigger air ratio.

[JohnD1079]

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