Is that Tim's handy work? Boy has some great AL tig skills.

 

thats gonna make redoing the intercooler piping interesting......if the TB faces up we might not be able to close the hood.

 

That's what I was thinking, look at the flange though and you can tell that the TB would be on the bottom.

 

I love it. Can't wait to see that on a car.

 

The 90deg turn out or that TB makes baby jesus cry...

 

You usually have a 90deg turn immediately before the TB anyway that's being eliminated with this setup so I don't see it being a big deal, not like there's not a 90deg turn into each cylinder too.

 

Any thoughts on creating something that would allow a larger than stock throttle body to be installed? I really hate the 3rd design.

 

Any one of these manifolds will allow for a larger TB to be installed, just modify the flange accordingly.

 

That mani looks like a lot of the big money aftermarket jap manifolds. Here's a DIY (fred's) iteration. Is this both a raised stack and constant radius?

 

+1

 

The TB faces the floor. And yeah, that would mean new IC tubing.
Stephanie

 

A larger TB could be used on any of them. We just have to enlarge the flange slightly. No big deal. It's ok if you don't like this one. There is going to be 4 total.
Stephanie

 

would be cool to see how mine's coming along

 

Stephanie, how compatible will these be with oem equipment? I know EGR is gone (which is no problem), but what about vacuum lines and PCV?

 

run the pcv to a catch can or just let it blow oil onto the IM lol

 

I was playing some more.

I really like the idea of a tapered IM. With what I'm finding, it's providing the best flow into #4. A little too good in this certain case:



I removed the stacks...seems like they really helped create a larger area to pull airflow from. With the stacks back in place I got flow back into #1.



so then I thought, why not move the TB inlet back 2" inches to see what difference it had...in the same conditions it flow like the first one...it's almost like the stack of #1 needs to be right at the inlet to work.



so at this point I thought angling the TB would be the best to retain that lost flow but as to not disturb the airflow to the rear of the manifold. Which seemed to help.



I was really starting to like this shape, so I went crazy with teh inlet and did the common "teardrop" shape and saw pretty good results.

 

scott, humor me here. use this model and add a tiny ridge around the inside edge of the inlet tube about half way in. like a pipe bead but on the inside. maybe .06 high. then re-do this simulation.

 

your final design reminds me of some of the versions made for the sr2d0et. what if you make the tb 2" further out from #1 and not closer?

 

You can see I tried that between images 2 and 3.

The differences between all the above are

1. no stacks.
2. stacks
3. 1.3" added between wall and stacks
4. 14° angle on inlet.
5. crazy angled inlet and teardrop taper.

I mean hell knows if I'm setting up these pressure boundaries correctly, but it's pretty obvious which variation flows evenly the best. This has me thinking about something, going to try a different inlet variant.

 

put the ridge in!! and radius the transition between the TB area and plenum.