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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old March 6th, 2018, 17:54   #1
Ls3ase
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Default N75 / N18 help

I have a 1z / ahu swapped in a toyota

I swapped the n18 valve in for the n75 because I need vacuum to pull the turbo wastegate open.

If I simulated 10-30 lbs of boost to the ecu my n75 / boost valve duty cycle does not change nor does the wastegate move

Did I make a wiring mistake?

How to I get the n18 to open the wastegate?

How many pounds of boost does the ecu need to read before it opens the wastegate?
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Old March 6th, 2018, 21:23   #2
KLXD
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If you really have bacuum plumbed to actuate the wastegate on a stock 1Z/AHU that's your problem.

Wastegate is operated by manifold pressure on these.

If you have something other than a stock TC installed you should say so.
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Last edited by KLXD; March 6th, 2018 at 21:26.
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Old March 7th, 2018, 00:52   #3
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Winner winner.. it’s a vacuum operated actuator on an aftermarket turbo
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Old March 7th, 2018, 00:53   #4
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I thought I was clear, sorry.

I swapped the n18 valve in for the n75 because I need vacuum to pull the turbo wastegate open ON A AFTERMARKET TURBO.
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Old March 7th, 2018, 03:14   #5
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did you have the ecm tuned for a vnt and n75 ?
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Old March 7th, 2018, 07:27   #6
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No, this is not a vnt turbo.
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Old March 7th, 2018, 08:53   #7
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Well that's very different.

I may be showing my ignernce here but that's ok if I've got it wrong I learn something.

With a stock AHU when you have too much willy the ECU applies some manifold pressure to open the wastegate.

With your system you want it to apply some vacuum.

Seems to me the basic ECU logic would be the same.

So...Do you have it plumbed right? Common port to the actuator, NO port to the airbox and NC to the vacuum source?
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Current: 02 Jetta, Auto; 98 Jetta, 5 Spd; 98 Dodge, 5 Spd, SB, 4x4; 84 Grand Wagoneer with Nissan SD33T, NV4500, Dana 300, Reverse Cut Dana 44, Dana 60

The Black Sheep (Only gasser): 85 CJ, 4.2 w/4.0 Head and Mopar FI.

Past: 85 Mitsubishi PU, 4D55T; 81 Rabbit, 1.6; 80 Dasher, 1.5; 79 Rabbit, 1.5
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Old March 7th, 2018, 12:49   #8
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you're probably going to need some custom chips to run that style setup... seems the ahu/1z pressure dependent n75/wastegate setup should only open when the max boost set point is achieved which means it'll be closed until that point is reached, you need it to be open and transmitting vacuum to close the actuator until boost setpoint is achieved, so it's working backward to what you need ...someone please chime in if i'm wrong
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Last edited by jimbote; March 7th, 2018 at 12:55.
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Old March 7th, 2018, 13:15   #9
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It works the same way as the stock turbo except with vacuum
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Old March 7th, 2018, 14:08   #10
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Quote:
Originally Posted by Ls3ase View Post
It works the same way as the stock turbo except with vacuum
If it's a vacuum actuated wastegate then it has to have vacuum applied to close the wastegate and make boost... a pressure actuated wastegate applies pressure to open the wastegate and reduce boost ... from the quick reading I did the vacuum actuated wastegate does not have a spring to keep the wastegate closed but relies purely on vacuum... Is this not the case with your turbo?
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Old March 7th, 2018, 15:20   #11
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Well that's very different too. I assumed vacuum was used to open it.

I'll shut up and listen now.
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Saying no to gas for 25 years:

Current: 02 Jetta, Auto; 98 Jetta, 5 Spd; 98 Dodge, 5 Spd, SB, 4x4; 84 Grand Wagoneer with Nissan SD33T, NV4500, Dana 300, Reverse Cut Dana 44, Dana 60

The Black Sheep (Only gasser): 85 CJ, 4.2 w/4.0 Head and Mopar FI.

Past: 85 Mitsubishi PU, 4D55T; 81 Rabbit, 1.6; 80 Dasher, 1.5; 79 Rabbit, 1.5
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Old March 7th, 2018, 16:03   #12
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Quote:
Originally Posted by jimbote View Post
If it's a vacuum actuated wastegate then it has to have vacuum applied to close the wastegate and make boost... a pressure actuated wastegate applies pressure to open the wastegate and reduce boost ... from the quick reading I did the vacuum actuated wastegate does not have a spring to keep the wastegate closed but relies purely on vacuum... Is this not the case with your turbo?
Vacuum opens this wastegated and reduces boost
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Old March 7th, 2018, 16:30   #13
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Someone with a tdi b4 Passat will you...

Post a screen shot of 002 and 006 measuring blocks in vcds?
Post a screen shot of 011 measuring block when supplying the Ecu with 20lbs pressure w/ a mighty vac or something similar

Measure the turbo actuator pressure when supplying the Ecu with 20lbs of pressure w/ a might vac

Measure the voltage at N75 at 1lb and 20lbs pressure to the Ecu


Pretty please?
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Old March 8th, 2018, 13:37   #14
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Quote:
Originally Posted by Ls3ase View Post
Someone with a tdi b4 Passat will you...

Post a screen shot of 002 and 006 measuring blocks in vcds?
Post a screen shot of 011 measuring block when supplying the Ecu with 20lbs pressure w/ a mighty vac or something similar

Measure the turbo actuator pressure when supplying the Ecu with 20lbs of pressure w/ a might vac

Measure the voltage at N75 at 1lb and 20lbs pressure to the Ecu


Pretty please?
I really don't think you understand how your turbo / N75 valve works.

Your wastegate opens when only pressure is applied to it. The N75 valve's job is to block pressure flowing to the wastegate until the ECU turns on the N75 valve. Vacuum has nothing to do with opening your wastegate. There is always manifold pressure going to the N75 valve and when the ECU wants to open the wastegate, it applies a ground to the N75 valves (there is always 12V going to it) allowing that pressure to pass and actually push on the wastegate and opening it. The ECU controls the wastegate with pulse width modulation, not a varying voltage, as it is either "on" or "off". So measuring voltage would give meaningless results as it is always 12V on one side of it and the other side is ground/float state. VCDS will show you the duty cycle of the N75 valve and my experience is that VCDS vs what is the actual duty cycle is the same.
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Last edited by Hasenwerk; March 8th, 2018 at 13:41.
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Old March 8th, 2018, 16:40   #15
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Please tell me what turbo I am running?
Please tell me what happens to MY actuator when vacuum is applied?
Please tell me what happens to my n75 and n18 valves when I use vacuum instead of pressure?
Please tell me you have actually measured 12v at the N75

I've actually tested with vacuum, pressure, and gauges...

David please stop replying to all of my posts anywhere. Your posts are useless.
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