Very informative thread. Rated five stars. I'm not entirely sure how the RD box can manipulate turbo boost unless the turbo has an ECU controlled waste gate. Most stock common rail diesel engines run a little lean to meet emission standards.
The bump in boost may be an indirect result of increased rail pressure. More fuel means more exhaust gases and that in turn means more boost.
Originally Posted by dhanushs. Usually what happens in a turbocharger is: Pushing down the rod means opening the wastegate valve. Hence, the compressor fins doesnt turn , and boost drops.
Now, the adjustment: Bypass the turbo: For bypassing the turbo no-turbo effect , just remove the pin, and uncouple the valve and spring mechanism. Most probably you will endup with a blown turbo when it goes beyond its tolerance levels and needs good lubricating and a bigger intercooler to cater the EGR tempreature under control. The single channel box controls only rail pressure.
Adding more fuel will increase performance to an extent, and that power increase can be improved by adding more air as well hence dual channel. I'll not discuss more about the RD box as there's a separate thread dedicated to it. Dhanushs, what you have demonstrated here could prove quite expensive as it may blow up the Turbo wheel because of over speeding , specially if you travel to higher altitude where Turbo try to spin faster.
However you may try moving the nut by fraction of inches which may slightly improve your low end performance while trading off with high end performance, Believe me it is not worth a penny.
Originally Posted by TurboGuru. Proudly powered by E2E Networks. An engine turbo charger produces extra horsepower and performance in an automobile engine. It does this by pressurizing the intake air before it enters the engine for combustion.
Rapidly spinning turbo blade fans compress the air, but in order to do so the compressor wheel needs to know how fast to turn and what pressure to deliver. The wastegate, mounted on the exhaust side of the turbo, controls the power boost, or pressure.
The external turbo wastegate has an adjustment function which allows an increase or decrease in pressure. Raise the hood of the vehicle and locate a vacuum line that enters the intake manifold. Refer to your owner's manual for a proper line that can be accessed easily. Pull the vacuum line loose and install a T-fitting to the hose, so that a boost gauge ties in the with the line and the other port of the boost gauge has a vacuum line that runs through your open window into the driver's passenger compartment.
Drive the vehicle until it reaches normal operating temperature, typically 20 to 30 minutes. Find an expressway and bring the engine speed up to, or close to, 4, rpm, according to the tachometer. Do not exceed the speed limit, but run the vehicle for a short duration at this speed and make a note of the boost gauge reading on the dial.
Therefore, the only aspect that we can change on the OEM actuator is preload. Shortening the wastegate rod using the adjustment screws adds preload to the internal spring. The reverse removes preload. When you increase the preload you do two things. One is that you increase the boost pressure needed to start opening the wastegate. The second is that you lower the opening range of the wastegate door. Increasing preload or changing the actuator with a higher spring pressure model such as a Turbosmart pictured below results in more boost!
First of all, keep in mind that making these kind of changes almost always requires that you get your tune adjusted. Reliable boost control is extremely important for the reliability of the engine. Secondly, you can introduce boost response issues such as boost spiking and boost creep. Finally you have to make sure that more boost actually results in more power.
A small-sized turbocharger can give your car a power boost quickly, at lower engine speeds. But what happens when your car speeds up and needs yet another boost? You step on the gas and lots of air enters the engine, which could potentially cause the small turbocharger to spin like crazy. This is why most automotive turbochargers are installed with a handy little valve, called a wastegate. The wastegate responds to the boost in pressure.
If the pressure is too high, this often indicates that the turbine is spinning too quickly. The wastegate fixes the problem by channeling some of the exhaust around the turbine blades in order to slow the turbine down.
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