IAB delete

[riceraccord]

I am in the middle of doing a 5-speed swap on my cb and went ahead and took off the intake manifold to give me alittle more room to work and I decided since it was out I went ahead and port matched the manifold but I also wanted to delete the IAB butterflies and was wondering what methods you guys have used to seal the ends of the IAB plate and how long it has lasted? Also did you seal all the holes on the inside?

[93accordexcoupe]

i just did this but i didnt delete mine. if that makes sense. i added another IAB plate that i emptied under my stock IAB plate with the butterflies. i just used JB weld to seal up the holes on the end and it is working perfectly. i didnt seal the inside holes but i probly will one day.

[19dabeast85]

Unless you are turbo'ed or plan on running 7000+rpms non-stop, you really DO NOT want to delete your IAB's. Anyone who says the felt an improvement from this is lying. You will lose low-end efficiency and will gain negligible (0.5-1.0hp) up top. Not worth it.

[UrDoneSRH]

keep the iabs. they are great in the low-end.

[betterstolen]

The IAB or secondary intake runner is a set of butterflies in the intake manifold of B18C and H22A engines. The P72 ECU controls the IAB, but other ECUs do not. If IAB control is lost by swapping ECUs then the engine will always run on both intake runners, typically losing 8 hp from 3,000 to 5,500 rpm.
from the hondata website.

[19dabeast85]

The F22a6 in the EX Accords also has IAB. And the PT6 ECU comes in those to control it.

[The G-Man]

Unless you are turbo'ed or plan on running 7000+rpms non-stop, you really DO NOT want to delete your IAB's. Anyone who says the felt an improvement from this is lying. You will lose low-end efficiency and will gain negligible (0.5-1.0hp) up top. Not worth it.

Actually removing them is dyno proven HP and TQ.

http://www.cb7tuner.com/vbb/showthre...ight=blacktrax

http://www.cb7tuner.com/vbb/showthre...ight=blacktrax

http://www.cb7tuner.com/vbb/showthre...ight=blacktrax

[Shadow1]

heres a question. what about removing the IAB plate completely?

forget about putting in the plenum spacer and the IAB plate. what about just taking out the IAB plate. could you get any gains from that?

[The G-Man]

heres a question. what about removing the IAB plate completely?

forget about putting in the plenum spacer and the IAB plate. what about just taking out the IAB plate. could you get any gains from that?

Yes. Mainly in the top end.

[98vtec]

heres a question. what about removing the IAB plate completely?

forget about putting in the plenum spacer and the IAB plate. what about just taking out the IAB plate. could you get any gains from that?

you will gain everywhere. I've done it and datalogged the effects. Jdogg and Jeff Evans have both said they always gain around 5whp in the whole operating range by simply removing the plate altogether and retuning.

[bcjammerx]

Emphasis on RETUNING?

do you gain with just taking 'em off or is the re-tune the most important part of the deal?

[19dabeast85]

Actually removing them is dyno proven HP and TQ.

The OP is talking about completely removing the IAB's altogether. In none of those links does the person REMOVE IAB's, they simply stack what is essentially another "empty" IAB plate between the runners and original IAB plate. So they are keeping their IAB's functional and making the intake runners longer while potentially decreasing intake air temps with the insulating aspects of the spacer.

I would love to see 2 dyno charts with the only difference being the IAB's functional, and then IAB valves removed to clear up the fact that low-end will definitely suffer from reduced air velocity into the cylinder.

[98vtec]

I would love to see 2 dyno charts with the only difference being the IAB's functional, and then IAB valves removed to clear up the fact that low-end will definitely suffer from reduced air velocity into the cylinder.

if it hasnt been proven then there is no fact. Why would it reduce velocity?

tuning is a requirement with this modification.

[Shadow1]

if it hasnt been proven then there is no fact. Why would it reduce velocity?

tuning is a requirement with this modification.

so you mean i have to get a chipped ECU in order to delete my IABs so i can get a new tune?

[The G-Man]

The OP is talking about completely removing the IAB's altogether. In none of those links does the person REMOVE IAB's, they simply stack what is essentially another "empty" IAB plate between the runners and original IAB plate. So they are keeping their IAB's functional and making the intake runners longer while potentially decreasing intake air temps with the insulating aspects of the spacer.

I would love to see 2 dyno charts with the only difference being the IAB's functional, and then IAB valves removed to clear up the fact that low-end will definitely suffer from reduced air velocity into the cylinder.

There is also information in those threads that deals with the use of two of the spacers. The graphs for those were and improvement over one spacer and the stock IAB plate.