[Ecotec] Ecotec intake manifold, restrictive at 291rwhp

[HamaTime™]

Yeah, and you were saying you need a twin Plenum/seperated manifold weren't you.

 

[VT-565]

It's not known what is 'needed' yet, just that they are suspicious of the current intake manifold being restrictive.
Individual throttles ftw

Can tune through your trumpet length then

 

[soop]

lol that manifold has a huge plenum but still has the piddly little runners. What is that supposed to achieve?
It might work with FI, but I doubt that even.

Tuned runners are where the advantage is. The plenum only needs to be big enough to fit all the runners into it. Otherwise the air speed just stops.

 

[VT-565]

I think you need to look at a few 'factory' manifolds for inspiration.

The Boss intake.
The VN SS Grp A intake.
Both cross ram with a plenum.

 

[soop]

And you'll notice the plenum is only big enough to fit the runners. That other one that was linked is just silly IMO.

 

[Not_An_Abba_Fan]

ITS N/A not turbo

Doesn't he say here that it's turbo'd?

turboed tho mate, so intake system is obviously having it's air forced thru that path.

Or was he just referring to the picture?

 

[soop]

Just the pic

 

[GTP 85]

Doesn't he say here that it's turbo'd? Or was he just referring to the picture?

Yea sorry, must clarify... I was referring to the pic of the turboed car

My engine is nat aspirated

 

[Not_An_Abba_Fan]

Being naturally aspirated it would then rely on atmospheric pressure to push air into the engine. I doubt the intake manifold and plenum would be the restriction. The rate of flow into a given cylinder through the inlet valve couldn't be more than the plenum's capacity. I wouldn't have thought anyway. If air coming in is the problem then you need to work backwards from the exhaust as well. The engine can only take in what it has room for, if there are any pressure waves left over in the exhaust and intake runners then this will restrict the amount of air that can come in. An efficient exhaust is the key to maximising intake charge.

Unbolt the exhaust at the headers and do a dyno run, you will find your power curve change dramatically. The thing people don't realize is to achieve maximum "power", the exhaust should be removed as it is the most restrictive thing at high rpm.

 

[Pub247]

lol at that plemun on ebay not worth money thats for sure. As for it being 1 peice i doubt it you can just reach your hand through the front and do the bolts ups mate and i have built a few like that.

As vt565 said Idividual TB and trumpets are the way to go