B18C Type R and VTi-R Intake manifolds

[spetz]

Am I correct in that the B18C non type R intake manifold has a dual intake length system on it?
Where as the Type R doesn't?

I was wondering what the reason for this is? After having a look inside my intake manifold however I see those butterflies being quite restrictive even at full open position, so I am guessing the ITR doesn't have them for more top end power, in the expense of less low end?

Would it be a good idea to get rid of these butterflies for more top end??

[wynode]

*moved*

Take not this is integra specific so it is moved to the integra forum.

For low RPM to improve torque the butterflies create a longer path for the air. For high RPM power a shorter path is better.

But like you said at the end of your second paragraph.

[kOncept]

The Vti-R has dual intake ports whereas the Type R has a single, it was done to improve high speed air flow.

I believe this also allowed peak torque to be at 7500rpm which is considered high but was done to compliment the hp peak at 7900-8000rpm.

[spetz]

So, would a VTi-R gain power with a Type R intake manifold? In the top end?

Or, what about using a VTi-R intake manifold, extrude hone, port etc the runners, cut off the plenum, get rid of the butterflies, remove about 3-4cm off the runners and weld a new plenum with bigger throttle body, would this be a good step for improving top end power?

Is it a common exercise to remove the butterflies on VTEC equiped cars with the variable length intake?

[ginganggooly]

i was given some scary pricing for modifying a vti-r manifold.

i gained 7kw by changing from a stock vti-r manifold to a skunk2 manifold.
i never actually hit the strip with the totally stock manifold, but i did try it out with bored and tapered vti-r manifold and ran at 94mph, went back again a couple of weeks later with the skunk2 manifold and ran at 96mph...

[kOncept]

you wont be able to fit the Type R manifold on to the VTi-R head,

if you want something similar get the Skunk2 IM, pm dynodave for it.

No point modding the VTi-R manifold, for very little money you can get the skunk2 one.

[spetz]

I'm just asking hypothetical questions to get a better idea,
So, price isn't an issue as I don't even have a B18C I am just curious how the engines would respond to such mods

[ginganggooly]

if it's a hypothetical, then the vti-r manifold seems to work okay if you invest a bit of time and money in to them. That erik's racing integra record breaker was using a modified vti-r manifold.

[evo201]

sorry dont want to hijack this tread buit these skunk2 manifolds are they itr copies?
and how much are they? where to buy? etc

[ECU-MAN]

start a new thread in the WTB section

[aznsiko]

ok.. lol.. sorry guys.. lets say.. which is would be the better then for a B18A1?? LS.. the type R manifold or VTiR.. because if the type R manifold is meant to be better up in 7900-8000RPM?? would that mean the VTiR would be better?? because the LS doesnt get up that high??