Sep 11, 2011 - For quite a few years I've been playing with the VNT turbos on. I had forgotten how you built the manual boost controller, thanks for the. Yes the D40 has VNT turbo, so boost varies, have seen mine hit 22psi. Ive got a manual boost controller and i hated setting it up.electronic. • • • • • • Manual Boost Controller • Welcome to GearHeads. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please,! If you have any problems with the registration process or your account login, please contact. Also, if you have read this far, we might as well let you know that the REAL action happens in our. Join us to find out! • ATTENTION Unregistered - Please take a note of our new with immediate effect. Feedbacks, suggestions and discussion thread. Contemplating the design wrt to the functioning in my car I could figure out that the vacuum actuator starts engaging from 1500 rpm upwards. If the actuator is engaging (after 1500 rpm) then the vanes are closing increasing the boost immediately. As the rpm increases beyond 3000 the actuator starts releasing again meaning the vanes are open decreasing the boost. Also at idle & below 1500 the acutator is not engaged meaning at that range the vanes are open. To have a perspective I have edited the images; a)when vanes are closed (mid rpm) the exhaust air is directed towards the outer edges of the turbo blades (yellow arrow mark) spinning it at the highest rpm thereby the highest boost. B)when vanes are open (at idle & high rpm) the exhaust air is directed (yellow arrow mark) towards the middle & center, which decreases the turbo rpm thereby decreasing the boost. The principle is similair to the 'crowbar & fulcrum'. Lesser pressure required to lift a heavy object at the end of the rod. More pressure is required to lift the object as you go towards the middle nearing the fulcrum. I figured out a way by which the Manual Boost controller can be useful in a vacuum referenced VGT turbo - thanks to FlyTDI Guy of TDI forums The ideal way to increase boost in a VGT Diesel engine is to remap the ECU so that the pulses of the stock boost controller solenoid are altered allowing for more vacuum at the vane actuator closing the vanes, thereby more boost. More than stock boost can be detrimental to the engine since VGTs produces spikes. I have logged boost spikes of 30+ psi with android 'Torque '. Close the bleed hole on the MBC & tap onto the boosted air circuit pre-intercooler. The other end of the MBC is ' T ' ed on to the vane actuator's vacuum reference line. Source: Here the N75 is the vacuum control solenoid valve - PWM (pulse width modulation) controlled by ECU This way the MBC can be used to control boost spikes. It cannot be used to increase stock boost levels. A brainwave stuck me - What will happen if I add a fast acting one-way valve in-between the VGT Vaccum solenoid & the Vane actuator? Theoretically it should hold more vaccum at the actuator keeping the vanes closed for a longer time hence allowing the turbo to spool more. I procured a one-way valve (from an aquarium air pump) but the pressure required to keep it open was too much. The valve would hardly open while manually blowing through a tube. Discarded it. After which ' joeking ' gave me a carburetor one-way valve (automotive grade) from a used Honda engine. Yesterday I connected it & my! The turbo is spooling consistently at 22-23 psi on slight throttle! This is almost 6 psi more than stock regulated 16 - 17 psi boost. Also in stock the boost further drops to 6 psi post 4000 rpm. I wouldn't recommend this to anybody. It could affect blow the turbo. Draft program kerja tahunan. I have a Scangauge 2 & I can see the the coolant temperature shooting up +5 degree celcius. Have to procure an EGT Pyrometer to check whats happening in the exhaust side. With the one-way valve I have managed to increase the stock boost level. The issue here is the turbo boosts at 24 psi even at 4000rpm whereas in stock beyond 4000rpm the VGT solenoid cuts vacuum to reduce boost as much as 6 psi! Moreover I feel ECU doesn't signal the required fueling at higher rpm in high boost. If I keep boosting at 23.9 psi (post intercooler read by ECU) on 4000 rpm within few minutes the coolant temperature touches 95 degree celcius!
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