+- STD (https://www.superturbodiesel.com/std)
+-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6)
+--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7)
+--- Thread: Ideal VNT Opperation (/showthread.php?tid=162)
Ideal VNT Opperation - bgkast - 03-07-2008
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?
Re: Ideal VNT Opperation - ForcedInduction - 03-08-2008
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.
Re: Ideal VNT Opperation - ForcedInduction - 03-08-2008
Here is how Holset controls their VGT.
[attachment=0]<!-- ia0 -->Holset VGT controla.jpg<!-- ia0 -->[/attachment]
Re: Ideal VNT Opperation - bgkast - 03-08-2008
I assume that Holset and the other VNT turbo manufactures' Turbo ECU is integrated into the vehicles main ECU, correct?
Re: Ideal VNT Opperation - ForcedInduction - 03-08-2008
Correct. I don't know of any vehicle that uses an ECM just for the turbo.
Re: Ideal VNT Opperation - bgkast - 03-08-2008
That would be too easy, :mrgreen:
Re: Ideal VNT Opperation - winmutt - 03-12-2008
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.
Re: Ideal VNT Opperation - winmutt - 03-17-2008
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).
Re: Ideal VNT Opperation - bgkast - 03-17-2008
The problem with that, and the electronic VNT is that you need to hire an electrical engineer. :geek:
Re: Ideal VNT Opperation - ForcedInduction - 03-18-2008
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.