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Secondary Butterflies, fuel rail
violentblue - 29/3/08 at 10:15 PM

Hi all,
working on my intake manifold and figured I'd better respace my ITB's so they'd fit better.

There a set of R1 ITBs with the secondary butterflies. not entirely sire what these are for but there seems to be a stepper motor or something that controlls them.

I don't believe that megasquirt has provision to controll this, so shouls I just remove them or what?

I'd like to know the solution others have come up with for this.

also, extending the fuel rail, should I just cut it and use a section of pressure rated fuel line to bridge the gap?

vinny1275 - 30/3/08 at 07:48 AM

Hi,

I'm using GSXR throttle bodies, they have the same arrangement. We've removed the secondary butterflies - I think these are like an automatic choke - it's something you can live without. The latest version of megasquirt does have a controller for this iirc.

We bought a length of fuel rail and will drill it at appropriate spaces and then we'll make some brackets to hold it all in.

HTH


Vince

RazMan - 30/3/08 at 11:05 AM

Aren't they something to do with improving torque at low revs? That's what my Duratec V6 had originally fitted - I removed them to make mapping easier.

violentblue - 30/3/08 at 03:22 PM

Thanks, that helps.

I think I'll remove the controller but keep the butterflies, but lock them at full open so I don't need to worry about sealing the holes back up.

Jenko - 31/3/08 at 12:25 PM

quote:
Originally posted by violentblue
Thanks, that helps.

I think I'll remove the controller but keep the butterflies, but lock them at full open so I don't need to worry about sealing the holes back up.


I wouldn't do that......get rid of them and fill the holes - It's not a hard job, and the air flow will not be compromised........

violentblue - 2/4/08 at 04:34 PM

thought about converting the secondaries to locked ajustable system, so I can govern the max throttle for, just in case I let someone else drive.

spinning up some caps for the holes out of aluminium isn't difficult, but whats the fun in that?

[Edited on 2/4/08 by violentblue]