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[snm95ls]

On lower power setups.

From my limited understanding...

Pros:
compact
simple


Cons:
?


Thinking of getting a dual port actuator to be able to run boost control with eCtune eventually.

I know that JD despises them, or seems to anyway, but I don't recall reading the reasons why they may be full of fail.

[DreaMeR]

harder to control than external and has problems with higher boost and creeping

[patsmx5]

Pros: cheap
Cons: everything else.

[snm95ls]

Pros: cheap
Cons: everything else.

Lol.  Kind of what I expected to hear.


Like I said fellas, lower power apps, like 200-250 on a bigger T3.  Total no no?


Boost creep is because of the lack of bypass area I would assume.




(I figured this is good discussion material, and I am genuinely curious.)

[patsmx5]

Pros: cheap
Cons: everything else.

Lol.  Kind of what I expected to hear.


Like I said fellas, lower power apps, like 200-250 on a bigger T3.  Total no no?


Boost creep is because of the lack of bypass area I would assume.




(I figured this is good discussion material, and I am genuinely curious.)

I'll post more tomorrow after I take my last test before finals. (gay) But if it were me I'd put a cheap dual port external gate on that bitch. THey're like 70-80 bucks shipped. Mine was 100, now it's 70 shipped and it works good. Just a CDM special.

[dvst8r]

Pro's:
-I can steal the actuators to make a crude controller for VNT apps.
-I can now weld shut the flapper, and make it a perfectly good, turbo for use with an external gate.

Con's:
- I have told you my secret.
- It is work to accomplish above.

[BoostedSchemes]

pros = its on the fuckin turbo already
cons = the WG opening is like 10mm and you end up running 30psi because youre too lazy to install an external

[patsmx5]

Ok, a little more info.

With a dual port external gate, you can set the WG up such that it stays pinned-the-fuck-shut till the MBC comes online.

With a single port EWG the WG sees manifold pressure all the time. If it has an 8 PSI spring, then it takes a net of 8 PSI acting on the diaphragm to overcome the spring and open the gate. You get 8 PSI boost.

With a dual port, you have a port on each side of the diaphragm.  So say you want to run 14 PSI and you have an 8 PSI external gate. Then you hook the the WG up such that when you're making boost, the top WG port sees boost, and keeps the fucker pinned shut. The more boost you make, the more of an air spring builds up on the top of the diaphragm to assist the spring in keeping the WG shut.

The other port is referenced to a MBC though. So when you're making 2, 5, 9, 11, 12, etc PSI, that port never sees boost as the MBC hasn't opened yet. So the WG stays pinned shut and you get the best spool possible.

Then when you finally get close to target boost, your MBC opens. Then, all of a sudden X PSI (whatever the MBC is set to) shows up on the other side of the diaphragm and cancels out some of the air spring that's there from the top port. Then the WG opens to regulate boost.

[snm95ls]

Ok, a little more info.

With a dual port external gate, you can set the WG up such that it stays pinned-the-fuck-shut till the MBC comes online.

With a single port EWG the WG sees manifold pressure all the time. If it has an 8 PSI spring, then it takes a net of 8 PSI acting on the diaphragm to overcome the spring and open the gate. You get 8 PSI boost.

With a dual port, you have a port on each side of the diaphragm.  So say you want to run 14 PSI and you have an 8 PSI external gate. Then you hook the the WG up such that when you're making boost, the top WG port sees boost, and keeps the fucker pinned shut. The more boost you make, the more of an air spring builds up on the top of the diaphragm to assist the spring in keeping the WG shut.

The other port is referenced to a MBC though. So when you're making 2, 5, 9, 11, 12, etc PSI, that port never sees boost as the MBC hasn't opened yet. So the WG stays pinned shut and you get the best spool possible.

Then when you finally get close to target boost, your MBC opens. Then, all of a sudden X PSI (whatever the MBC is set to) shows up on the other side of the diaphragm and cancels out some of the air spring that's there from the top port. Then the WG opens to regulate boost.

Yeah, this is kind of why I brought up the dual port actuator.

 ;D

It seems to me that a dual port actuator would virtually eliminate boost taper, which I assume would come form the net pressure effect that you described.

Is this a reasonable conclusion?

It seems that with what I am personally looking at doing, it won't be such a bad idea to utilize the internal gate.  Using an HF manifold and adapter doesn't really give you many reliable options to use an external gate.  I am only looking to make about 250 WHP max on a old .60..63 A/R 60 trim T3.

Granted the possibility of boost creep is greater with the internal gate since the bypass orifice is so small.

[confUsed]

You can use the ectune solenoid to run the internal actuator too, just hook it up inline. Then you can have it stay shut until youre close to the boost you want, to get the best spool. If the port on the internal wastegate can swallow enought exhaust, you'll probably get pretty stable boost after playiong around with closed loop boost control too.