Fatman0203

Finally got the turbo's off to fix the metal pipe with the coolant leak. While their off, I'd like to port the waste gate and remove the flappers from the "exhaust manifold?". Is it the exhaust manifold that has the flapper, and the flapper on the turbo's that has the wastegate? Anyone got pics would be greatly apprecieated.

obviousboy

if you take a pic of the turbos i can tell you what to cut out and port.

KaiFD3S

iTrader: (37)

here you go check out this thread

https://www.rx7club.com/showthread.p...rted+wastegate

2a+RoN

I took out both the pre-control and TCA flappers and welded the holes shut. The wastegate is the one on the primary turbo hot side I believe and the TCA is on the manifold.

Fatman0203

The wastegate seems to be on the turbo's (i think), while everything else is on the exhaust manifold right? Problem is I need to get this done quick because my car isnt the only one in their shop right now.

Fatman0203

BTW since welding is required, everything in that area is iron right? Cause my girlfriends dad knows how to weld and he can probably do it for me.

obviousboy

yeah you can use a mig on that and itll work fine..........

Fatman0203

Im going to head over there now, pick up the turbo's and the exhaust manifold and take pics for you guys. I need this done by tonight if not im going to get charged for it having to stay another day.

overkill

the waste gate is not the easier one to get to. The port that is plainly visible is the TCA. To port the wastegate, you will need to remove the turbo with the wategate from the manifold. I did mine that way, but did not actually disassemble the actual turbo. Just make sure to tape up all the ports so that the metal filings do not damage your turbines when you start it up....

Fatman0203

I'll have pics of the turbo's soon. So I can get tips.

Fatman0203

Theres a nice crack between the two. Nothing bad though. Thats nearly the only crack.

Fatman0203

Wait is that the turbo pre-control activator?

Fatman0203

RedSquare: Is this the pre-control?
Yellow Square: Can I cut this piece out to stop the crack from spreading and probably provide better flow?

overkill

The port in the red square is the pre control. If you look inside the other exhaust port, you will be able to see the wastegate port, but will have to remove the c-clip that holds the wastegate control arm and separate it from the wastegate flapper. Then you will need to unbolt one end of both the coolant line and the oil line. Finally unbolt the turbo from the manifold, from there you will have access to the wastegate port. If you have any questions, pm, me and I will talk you though it. It's fairly easy.

you should not cut out that flange that separates those two ports- it's not part of the wastegate anyway.

Fatman0203

Am i supposed to remove the flapper inside the red square? and weld it shut like it says for the full non-seq? or only the one on the exhaust manifold? or both?

overkill

that I do not know..

Fatman0203

Anyone else know?

xb2002

This is the way I did it. I did not remove the pre-control. I welded it 90% open.

I did remove the turbo control(the one in the exhaust manifold itself. I removed the primary turbo from the housing and I bored out the wastegate hole to 1.24"

This is the instructions that I followed. The second set is a little more specific than the first.

http://www.scuderiaciriani.com/rx7/non-sequential.html

36. 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). The weld goes around the base of the lever that the pre-control actuator clipped to. DO not weld on the inside of the turbine housing in any way, shape or form, and do not simply tack this as it could come loose.
.

The Turbo Pre-control gate should be welded open. The weld goes at the
base of the outside control arm, and should be welded good, not just
tacked. (preferably TIG welded, but a good wire feed is acceptable for
this)

The turbo control gate in the manifold has got to be removed and the hole
tapped for pipe threads, and a cast iron pipe plug installed.

Fatman0203

Any idea why it shouldnt be removed? I dont really want to be a guinea pig, but I would like to know whats the big deal about just not getting rid of the flapper all together instead of 90% open deal.

xb2002

(you want the gate to be opened and be even with the turbine chamber flow path..IE less exhaust drag).


READ READ READ!!!!! lol

If you look closely at the setup you will understand... If you take it out you will disrupt the exhaust flow

Fatman0203

I guess =/, whats 90% btw? As open as I can get it with the rod in the back?

Fatman0203

BTW, looks like I may not be able to take off the flapper thats on the exhaust manifold. Does it make a difference? I had it held open with wire, and it ran hard, does it make any difference at all?

mad_7tist

is you seq system messed up? personaly i think parallel suks

xb2002

take the rod off, and the actuator for the pre control... put the block off plate on the housing covering the pre control flapper. open the pre control flapper (by the arm) until it makes slight contact with the plate. Make a index mark and weld it in place (open).



Yes it does make a difference as it will restrict exhaust flow. Take a die grinder with a cut off wheel (or a hacksaw) and just cut the arm off by cutting the shaft itself above the arm (between manifold and the arm). Then the flapper will slide out of the manifold. You will need to tap the hole to a 3/8" pipe and install a cast iron plug to prevent cracking.... hope this helps

Fatman0203

Put the block off plate? The one thats on there now right? Like the big block looking thing?





My problem is , that its on the car right now, (the exhaust manifold) and I wont be able to do this since the mechanic is going nuts that the car has been there 2 weeks and he wants it out. It would have been done today if I didnt "borrow' the turbos to grind the wastegate. Thats why Im asking if its a substantial difference it makes.