the holes that i cut out i made sure weret he same width as the tubing so i there is no restrictions, i had ot do some more grinding even after that picture was taken. thx guys. wow i have a hard time believing that using t's for 2 and 3 works better than this, well see.

brainiac as for what you said. the flange ill be between 1 and 2 so all the runners point to the collector

 

As I watch this thread and continue benchracing in my mind, I have a couple of questions that probably border on threadjackery... unswayed, here they are:
1) How hard is it really to fab an equal length manifold? Seems like you could just make four equal piles of weldels and tack away.
2)Failing a full equal length, what about a dual-Y design?

This sticks in my mind, since the issue with logs, be they cast or tubular, doesn't appear to be pulse related so much as flow related toward the collector. I think this design is a step in the right direction, directing flow toward the turbo, but the constant length of the piping seems to be working against you. Either an equal length or dual-y would give you the option of a real collector.

As someone who's done little more than check the oil (nothing more than that, actually!) how much room is there to get creative on the exhaust side of the engine bay?

by the by, that intake is pretty sexy looking!

 

Getting creative is kinda tough. If you have AC and PS then dropping the turbo lower gets to be a bitch. A custom mixing manifold is sometimes needed as well for clearance. Here is my old manifold and some other pics to give you an idea.






Here is a nice log setup Flipside did.
http://www.flipsidecustoms.com/Galle...nPinaMiata.htm

 

I am getting closer to fabbing my own manifold and this makes me very excited.

I also just rode in my friend's 300hp FM II Miata last night and that about pushed me over the excitment edge.

 

Thanks for posting Wot. That's sexy work, to be sure... but I gotsta keep my AC and PS, so it looks like a log might be my only route. How bout topmount for an equal length?

 

Both Top Mounts and Ram-Horn Bottom mounts have been done or could be done.
-Michael-

 

http://www.y8s.com/gallery/turbo/manifold02

Here is a nice topmount tubular from a forum member.
Thanks y8s

 

Thats a great mig welder for the money, I have one, it absolutely was the buy of the year when I paid $400 for mine new. It's been as low as $299 on sale (in the 170 amp model) but has been discontinued as a 180 amp. The 180 amp version had adjustments and a spot weld feature not found on the 170 amp version.

Mark

 

wow a turbo can hang down there loving it. ramhorn ftw. equal length is extremely hard to make. btw if you think there easy your not thinking in depth enough

 

yeah, i thought of that after i posted.

 

one of ETD's early products.
http://etdracing.com/manifold.html

 

How was it? Were you running their turbo as well?

 

It's ok. fitment wasn't perfect since they put the WG port on the #4 runner too close to the head. I couldn't mount my wastegate! It also was super warped at the head flange. It's off the car right now so I can deal with that. I got it so long ago that I got it for really cheap. like $400 ceramic coated.

I'm tempted now to make my own though after seeing all these great threads.