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Author Topic: Controlling an external Tial wastegate with the N75  (Read 27498 times)
Gizmo20VT
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« Reply #15 on: November 19, 2012, 02:45:03 PM »

Same as the reference picture in first post?
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marcellus
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« Reply #16 on: November 19, 2012, 03:13:42 PM »

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Milka
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« Reply #17 on: November 19, 2012, 05:19:40 PM »

I use twin MVS Tial gates on the RS6 with twin GTX3071s and I'm using the n75 tee'd to both bottom ports on the Tial wastegates, works perfectly.
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bbernd
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« Reply #18 on: November 20, 2012, 01:26:43 AM »

I use twin MVS Tial gates on the RS6 with twin GTX3071s and I'm using the n75 tee'd to both bottom ports on the Tial wastegates, works perfectly.

oh...sounds interesting...  I would like to see your KFLDIMX and KFLDRL maps if its possibe ;-)
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Milka
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« Reply #19 on: November 20, 2012, 03:20:43 AM »

Tuning is currently a work in progress we are currently getting the 1000cc injectors sorted (850cc @ 3 bar but running them at 4 bar).

I have help from someone on this forum and can't give anything out without his say so.  What I can do is point you in his direction if you like.

Here is the link to the nefmoto build thread only a couple of pics but there is a link to my full build thread.  http://nefariousmotorsports.com/forum/index.php?topic=2486.0title=

I was originally worried that the n75 could not control the Tial gates but seems to work very well.
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ibizacupra
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« Reply #20 on: November 20, 2012, 03:25:54 AM »

I use twin MVS Tial gates on the RS6 with twin GTX3071s and I'm using the n75 tee'd to both bottom ports on the Tial wastegates, works perfectly.

I also use stock n75 on external tial
works fine
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lacaci
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« Reply #21 on: November 20, 2012, 08:09:06 PM »

I don't know how the N75 ports work because I'm new to this type of ECu's. But if it opens ports 1 & 2 when energized then if you put it to the top of the wastegate you will have max boost at 100% duty only when the exhaust pressure is enough to overcome the spring pressure by itself. This is usually a little more than twice the spring pressure. So if you have a 10psi spring you will get about 24psi at 100% duty.

If you connect it only to the bottom you will have 10psi at 100% duty and more boost at less duty cycle.

Unless the solenoid output is inversed.
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Gizmo20VT
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« Reply #22 on: November 21, 2012, 12:38:39 AM »

Could someone perhaps post a picture of their actual Top port setup?
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prj
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« Reply #23 on: November 21, 2012, 06:44:57 AM »

I don't know how the N75 ports work because I'm new to this type of ECu's. But if it opens ports 1 & 2 when energized then if you put it to the top of the wastegate you will have max boost at 100% duty only when the exhaust pressure is enough to overcome the spring pressure by itself. This is usually a little more than twice the spring pressure. So if you have a 10psi spring you will get about 24psi at 100% duty.

If you connect it only to the bottom you will have 10psi at 100% duty and more boost at less duty cycle.

Unless the solenoid output is inversed.

Everything is opposite of what you just said.
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lacaci
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« Reply #24 on: November 21, 2012, 08:15:11 AM »

Everything is opposite of what you just said.

No it's not. If it is "working" opposite it means the valve's duty cycle is reversed or the port configuration is different. I know the valve in the picture but I don't know the N75.
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prj
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« Reply #25 on: November 21, 2012, 08:37:17 AM »

No it's not. If it is "working" opposite it means the valve's duty cycle is reversed or the port configuration is different. I know the valve in the picture but I don't know the N75.
My comment was made about the N75.

100% duty = shut gate. The N75 either routes the pressure coming into the bottom port through a restrictor out of the short port or it routes it to all ports.
When it is on, it routes it to all ports, thus the pressure is fed back into the intake, and the wastegate chamber sees no boost, allowing the boost to rise.
When it is off, the long port is blocked, and all boost gets fed into the bottom chamber of the wastegate, opening the gate.
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IamwhoIam
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« Reply #26 on: November 21, 2012, 09:05:21 AM »

No it's not. If it is "working" opposite it means the valve's duty cycle is reversed or the port configuration is different. I know the valve in the picture but I don't know the N75.


Quote
I don't know how the N75 ports work because I'm new to this type of ECu's


WTF?
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I have no logs because I have a boost gauge (makes things easier)
marcellus
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« Reply #27 on: November 21, 2012, 09:33:29 AM »

Could someone perhaps post a picture of their actual Top port setup?

My setup:
Line from intake manifold or turbocharger to bottom port of n75, short port on the sideof the n75 goes to the top port of the Tial.  Long port left open.
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Gizmo20VT
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« Reply #28 on: November 21, 2012, 12:52:51 PM »

My setup:
Line from intake manifold or turbocharger to bottom port of n75, short port on the sideof the n75 goes to the top port of the Tial.  Long port left open.

And bottom port has no positive pressure attached to it, or does it have manifold pressure as well?
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prj
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« Reply #29 on: November 21, 2012, 04:10:12 PM »

My setup:
Line from intake manifold or turbocharger to bottom port of n75, short port on the sideof the n75 goes to the top port of the Tial.  Long port left open.

Top port of the tial? I am guessing you mean the bottom port.
As if it was going to the top port, you'd be pushing on the membrane and shutting the wastegate the more duty is increased.

This would not work.
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