Custom UIM for the 3100.

[FallenZ24]

I happened to have some extra parts laying around and thought I'd see what I could do to improve the uim. I liked the extra volume of the 3500 uim but, didnt like the short runners. The short runners seemed to raise the raise the powerband quite a bit.

So I thought that I'd keep the runners the same length and add intake volume. A larger tb is also on the list of modifications.

I guess I'll start adding pics now. Hopefully I'll have this thing welded soon. I'm getting my brother to tig it for me. So this thing will cost me almost nothing.

-Joseph

Started cutting!


center cutout and braced from bottom to keep dimensions correct


200ci plenum


LS1 tb. I know it's big, but that's okay. It'll eventually be on a built turbo 3400.


Parts just placed together. The plenum will be much lower.


Questions and Comments are welcome!

[1988GTU]

Interesting.

[bjornmk1]

I wonder if your lower intake manifold
wouldn't be in the way if that new middlepiece gets lowered between those upper halfs.

you could possibly have issues with the injectorrail....

[mbear2489]

hmmmm, thats interesting, seems kinda square, are you gonna round that off at all? might help with flow if its not so angular

[Guest]

exactly. Round tubing would be better for this from a performance standpoint.

[Monzsta]

Manifold--><--You

I like the way you think...

[FallenZ24]

hmmmm, thats interesting, seems kinda square, are you gonna round that off at all? might help with flow if its not so angular

This plenum is so massive that I don't think flow will be a problem. I'm sure this intake will out flow my requirements. I am going to blend in the runners to the plenum after it is welded. It will have a velocity stack shape at the beggining of the runners. This will be for boost also. When you pressurize the plenum, flow isnt as big of a concern as with an N/A application.

This is something I'm throwing together very cheaply. If it does net any gains, atleast it looks cool. I guess I'll have to wait and see what it does.

-Joseph

[Superdave]

Must be nice to have that kind of hood clearance..


i had about 1/4" between the 3500 plenum and my hood bracing. So i cut out all the bracing.