Thread: Thinking about a custom manifold

Hi guys,

There has been some discussion recently on this topic, so thought i'd raise some questions.

Below is a pic of a custom manifold for an sr20de from an Aussie company.
I'm thinking about going with him to get a manifold for myself, using the std sr20ve runners.




Questions
a) what size is the std sr20ve throttle body?
b) is it worth going to an N1 throttle body?
c) is it worth using n1 runners?

Rough cost is around $500 US (weak aussie dollar for you..)

Any other thoughts or suggestions?

I would of course dyno before and after (inc tuning), but dont want to sink the money and not have a sound theoretical base for the whole deal.

First things first, is this for N/A or boost? I assume N/A. What rpm are planning on having peak power?

N/A
peak power 8000-8500rpm (about 1000rpm higher than currently)
focusing on power gains from ~5000rpm onwards

You mean utilize an entire half of the VE runners, half of it's factory length, including the flange, and basically bolt on a plenum? Or maybe ditch the flange and weld on the plenum?

I don't have the exact answers to your main questions but...


I think you've got a good plan. Frankly, I don't like the manifold in the pictures you posted. It seems to be headed in the right direction, but it seems to be for a turbo motor (if not, it's even worse) but the runner length is a bit short still (no big deal, I understand super short runners) but the runner width being stock seems completely wacky. I also assume there is no taper or horn where the runner meets the plenum (as there's no room for it). That's just bonkers.

I don't doubt this guy can give you something better, and that will work for you, I'd just keep your eyes open.

Edit: I just took a closer look. Maybe that bottom section of the plenum really incorporates the horns. Okay, maybe it's a decent manifold... :o

yes, it has internal velocity stacks, i believe the runners are basically used so theres no issue with bolting up.

The guy does a lot of turbo plenums, but the one above was designed for an n/a application

this looks really clean and well done./...as to how functional...that beats me..... is there anyway that they could make it so as to have access to inside the plenum.....soa s to adjust the stacks if u wanna use it for a next set up ???

I doubt it has true velocity stacks. Probably just a decent, flush, radiused transition/horn.

:o


Anyway, Hopefully your other questions will be answered soon. Searching not coming up with any results?

has some other pics (inc internal) of other motors plenums on his website

Custom Plenum Creations - Home

His Ford XR6 manifold has tiny velocity stacks.

Mitsubishi 4G63 has some great ones too.

No inside pics for the other manifolds. Wonder if that's because they don't have them, or because he never took pics.

Jeez he likes short runners, that's for sure.

Do you have to go with his billet throttle body (adding to the cost of the intake)?