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[GmasterT]

So having a thought... My (early) 3.0 with G-cams, 3.2 headers, no cats, lightened flywheel and rammness removed...

Would the long nose inlet off my old 3.2 be of benefit?

 

[doz]

How would you fit the idle speed control valve to a 3.2 DBW plenum?

[GmasterT]

How would you fit the idle speed control valve to a 3.2 DBW plenum?

Drill a big hole? Forgot about that bit to be honest, but as its just a push in fit, can't be that hard

[doz]

I'm having to think here. I had an old 3lt and I'm sure your right it had a stubby plenum but it was a 1996 car. Wasn't it around 98 the 3lt got the longer nose job? which is the same length as the 3.2's. I thought they changed it to the longer design to try and get some better mid range torque which makes some sense. Oh and if you do use a DBW set up your have to figure out a way of fitting the EGR and fixing the throttle cable as well.

[albitz]

Just fit a long nose plenum from a later 3.0.

[feeutfo]

Will you also need the throttle cable with the longer plenum? And associated cooant hoses to throttle body(probably not bothered about the later I guess? )

[GmasterT]

Cheers guys, mid range grunt is what Im after. So I will inspect the useability of the 3.2 plenum, if not, I'll be looking for a 3.0 one

[TheBoy]

don't break around with the 3.2 one, just get a 3.0l one from post 98 car.

[Kevin Wood]

The plenum doesn't make much difference to intake length as what's lost to the plenum is taken up by longer rubber ducts to connect it. What does change is plenum volume behind the throttle. If the throttle is fully open, that probably makes little difference, so I wouldn't waste my time changing it, TBH.

The theory behind tuning intakes is so heavy-going that, it you aren't going to throw everything away and start again, then next best thing to do is probably to keep what was on there from day 1. I doubt GM would have designed the engine with any huge flat spots that can be easily tuned out by messing with the plenum.

In fact, the above is evident in the nice flat torque curve a V6 will give then the multirams are working as they should.

[cem_devecioglu]

best intake I have ever seen is M3 intake design.. every cylinder have its own flap connected by a straight short tube..
 
 
it can be done on the omega but you need a serious change on omega hood..
 

[cem_devecioglu]

and I estimate a bigger plenum would be much better for track use..

[GmasterT]

best intake I have ever seen is M3 intake design.. every cylinder have its own flap connected by a straight short tube..
 
 
it can be done on the omega but you need a serious change on omega hood..

Individual throttle bodies Jenvey do them for the v6, but they are billions of £. I was looking into making speed triple bodies work...

[biggriffin]

got a 3.0L long nose plenum and throotle bodies here if your intrested £10.

[cem_devecioglu]

best intake I have ever seen is M3 intake design.. every cylinder have its own flap connected by a straight short tube..
 
 
it can be done on the omega but you need a serious change on omega hood..

Individual throttle bodies Jenvey do them for the v6, but they are billions of £. I was looking into making speed triple bodies work...

never seen them.. but you can be sure they will be the second best mod that will bring high hp gains after forced induction..
 
I have read lots of pages about mods and as a summary on a na engine throttle(s) (door of engine)  are #1 factor that determines the volume  engine can suck..because there is a velocity limit that air can flow on a na engine..   and secondary limitor is valve area/lift..

[GmasterT]

best intake I have ever seen is M3 intake design.. every cylinder have its own flap connected by a straight short tube..
 
 
it can be done on the omega but you need a serious change on omega hood..

Individual throttle bodies Jenvey do them for the v6, but they are billions of £. I was looking into making speed triple bodies work...

never seen them.. but you can be sure they will be the second best mod that will bring high hp gains after forced induction..
 
I have read lots of pages about mods and as a summary on a na engine throttle(s) (door of engine)  are #1 factor that determines the volume  engine can suck..because there is a velocity limit that air can flow on a na engine..   and secondary limitor is valve area/lift..

Don't read, just do? ITB's are proven to work, but are expensive, hence the M3 using them and all racing cars