dubulup

I’m hearing two different stories so I believe there is two different ways to do this (I know there are at least two ways to operate in non-seq (without going single)…Weld precontrol door SHUT or 90% open???

http://www.scuderiaciriani.com/rx7/

“Open the pre-control gate approx 90% and have welded in this position (you want the gate to be opened and be even with the turbine chamber flow path..IE less exhaust drag).”

So I guess I want to hear from people who have done the FULL-NS conversion.

Thanks for the help, hopefully things will become more clear.

cewrx7r1

iTrader: (2)

My full+ NS conversion has the precontrol gate lwelded 100% open. I do not think 90 or 100% makses any difference as far as affecting exhaust flow
which in this case is really pressure equalization.

vudoodoodoo

You can have it open w/ the door there. With that door, you are only getting 90%.
You can somehow remove that little door to get more flow.

dubulup

Thanks guys,

So, I can weld it shut, weld it open, or remove the door?

Anyone care to enlighten me as to why it makes no difference what I do with the precontrol door???

DamonB

Because the purpose of the precontrol is to allow a "sneak" path of exhaust from the primary to prespool the secondary. It is not in the intake air path. Since you are running both turbos nonsequential this door becomes irrelevant. I would lean towards welding it shut though; I think this would offer the best flow.

vudoodoodoo

If you are look straight at is if it were installed on the motor, weld it "shut".
Put the door in the position in which it covers the hole up and you can't see inside. Don't make it go too far, or the plate won't fit.
I put the plate back on and shut the flapper door. As far as you can go against the plate covering it.
Then just weld it.
Or you can just remove the flapper door all together.

jimlab

We removed the pre-control door on my car completely (a), ported the housing, and drilled and tapped the hole where the door pivot used to be and installed a cast iron pipe plug to close it off (b).



We also enlarged the wastegate orifice and ported the area immediately behind it in the exhaust manifold to unshroud the wastegate door and allow more flow.

dubulup

Thanks team that helps!

I believe I will be going with the SHUT version of this mod.

oh and that shield was a **** to get off, ended up braking a bolt and bending the F_out of it to get it off!!!

vudoodoodoo

Best way to do it.

vudoodoodoo

Make sure you get new bolts and use anit-seize when you put em back in.

suganuma

if you leave it shut, you're only getting half the exhaust flow that you could.....i did it like the above picture when i ran non-sequential.

i dont understand why anyone would shut it....maybe that's why you are spooling up so slow

-Nic

dubulup

Just when I thought I knew what I was going to do...

Marshall

People are jumping back and forth between doors in there. There are two, one on the first exhaust manifold and one on the second one.

dubulup

I know it got confusing and I still don't know what I'm going to do.

Turbo Control ACT. was connected to the Exhaust Manifold, and that flapper door is definitely coming out, the precontrol door was connected to the turbo assembly, that door will either get welded SHUT or removed. When I first saw that door, I wondered why the write up said to weld open, when the other door was getting removed??? Seems that if you remove one why not remove both??? I make decisions like a woman, so I'll be changing my mind until I either weld it shut or remove it...

jimlab

Weld the wastegate door closed. That'll make things interesting.