STD Tuning Engine Ideal VNT Opperation

Ideal VNT Opperation

Ideal VNT Opperation

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bgkast
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VGT-Intercooled

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03-07-2008, 10:01 PM #1
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Say you were going to build the ideal VNT controller for our cars, what inputs would it receive and how would they make the turbo respond?
bgkast
03-07-2008, 10:01 PM #1

Say you were going to build the ideal VNT controller for our cars, what inputs would it receive and how would they make the turbo respond?

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ForcedInduction
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03-08-2008, 06:05 AM #2
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Computer control with a servo actuator. RPM, throttle position and boost would be the minimum inputs needed to run it, road speed and exhaust pressure could help with economy.

RPM and TP determine the engine load which determines the desired pressure and boost input gives feedback to the ECM. Road speed could be used to fine tune the boost needed during cruise situations.
ForcedInduction
03-08-2008, 06:05 AM #2

Computer control with a servo actuator. RPM, throttle position and boost would be the minimum inputs needed to run it, road speed and exhaust pressure could help with economy.

RPM and TP determine the engine load which determines the desired pressure and boost input gives feedback to the ECM. Road speed could be used to fine tune the boost needed during cruise situations.

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ForcedInduction
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03-08-2008, 09:03 AM #3
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Here is how Holset controls their VGT.
[attachment=0]<!-- ia0 -->Holset VGT controla.jpg<!-- ia0 -->[/attachment]
ForcedInduction
03-08-2008, 09:03 AM #3

Here is how Holset controls their VGT.
[attachment=0]<!-- ia0 -->Holset VGT controla.jpg<!-- ia0 -->[/attachment]

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bgkast
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03-08-2008, 12:32 PM #4
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I assume that Holset and the other VNT turbo manufactures' Turbo ECU is integrated into the vehicles main ECU, correct?
bgkast
03-08-2008, 12:32 PM #4

I assume that Holset and the other VNT turbo manufactures' Turbo ECU is integrated into the vehicles main ECU, correct?

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ForcedInduction
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03-08-2008, 05:28 PM #5
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Correct. I don't know of any vehicle that uses an ECM just for the turbo.
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ForcedInduction
03-08-2008, 05:28 PM #5

Correct. I don't know of any vehicle that uses an ECM just for the turbo.

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bgkast
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03-08-2008, 09:03 PM #6
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That would be too easy, :mrgreen:
bgkast
03-08-2008, 09:03 PM #6

That would be too easy, :mrgreen:

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winmutt
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bitbanger

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03-12-2008, 11:51 AM #7
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bgkast That would be too easy, :mrgreen:
Yes to easy.

I believe that a voice coil would be the best way to do it. Fast and completely linear.
Attached Files
Image(s)
               
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
winmutt
03-12-2008, 11:51 AM #7

bgkast That would be too easy, :mrgreen:
Yes to easy.

I believe that a voice coil would be the best way to do it. Fast and completely linear.

Attached Files
Image(s)
               
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42

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winmutt
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bitbanger

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03-17-2008, 07:38 PM #8
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I had a brilliant idea today on the way home. Replacing the ALDA with a stepper motor (or even an ideal use for the CCU). This would allow you to control the amount of fuel (and rack travel?) based on all of the other factors. Beside fuel economy it would act as a failsafe incase of over boost, stuck vanes or if you feel like it (cruising economy).
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
winmutt
03-17-2008, 07:38 PM #8

I had a brilliant idea today on the way home. Replacing the ALDA with a stepper motor (or even an ideal use for the CCU). This would allow you to control the amount of fuel (and rack travel?) based on all of the other factors. Beside fuel economy it would act as a failsafe incase of over boost, stuck vanes or if you feel like it (cruising economy).

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42

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bgkast
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VGT-Intercooled

325
03-17-2008, 08:03 PM #9
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The problem with that, and the electronic VNT is that you need to hire an electrical engineer. :geek:
bgkast
03-17-2008, 08:03 PM #9

The problem with that, and the electronic VNT is that you need to hire an electrical engineer. :geek:

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ForcedInduction
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03-18-2008, 01:51 AM #10
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winmutt Beside fuel economy it would act as a failsafe incase of over boost, stuck vanes or if you feel like it (cruising economy).

The problem with that is your right foot controls maximum fuel. The ALDA has no affect at all on cruising economy.
ForcedInduction
03-18-2008, 01:51 AM #10

winmutt Beside fuel economy it would act as a failsafe incase of over boost, stuck vanes or if you feel like it (cruising economy).

The problem with that is your right foot controls maximum fuel. The ALDA has no affect at all on cruising economy.

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