Ok we know that the main difference between the 4g & 5g is the variable capacity intake and muffler.

On the intake...

How is it acuated?
Is it a quick change to the higher flow side or gradual?
Could a 4th gen use an rpm activated switch to actuate the manifold?
To you guys who have had 4g's also, does it look like it would fit?

I'm planning for the future, when I find a wrecked 5g I can pilage.

Thanks!

 

MardiGras-

The manifold switchover on the 5g is a quick changeover. It happens at 5000 rpm and is evident on a dynoplot. Basically, a flap changes position in the intake which makes the intake runners shorter. With a an underhood intake, its sounds much like VTEC. I believe the switch is ECU activated by vacuum, but Ive never checked it out thoroughly.

Check this plot out...this is a 5g car both stock and with Y-pipe and CAI. You will clearly see the benefits of the variable manifold. The blip at 5000 rpm is the manifold flap.

http://homestead.juno.com/madmax2k/files/567.bmp

 

There was some discussion about swapping the 5th gen intake manifold into a 4th gen Maxima. Sounds like a cool idea, but wouldn't you need the 5th Gen ECU (or a modified ECU) to take advantage of the manifold?

 

Probably not, I think it must be electricaly actuated in some way if it is RPM activated. So I could use a rpm to activate it.