VW TDI Performance - Building A Beast
- Author Nathan Young
- Published July 17, 2007
- Word count 547
As with building up any vehicle for power, vw tdi performance starts with the basic modifications first. The vw tdi will get its biggest two gains out of a tdi chip or module and out of tdi injectors. Your average chip or module upgrade will give about a 20% power increase. A tdi injector upgrade usually yields about a 20% gain as well. If the right combination of tdi chip/module and injectors are used even more will be gained. i.e. (Van Aaken Smartbox & Van Aaken Smart Power Nozzles) Those are the most basic vw tdi performance upgrades.
Another basic vw tdi performance modification is the tdi exhaust. If you are going to increase fueling you will in turn increase EGT’s (exhaust gas temperatures). So to keep temperatures lower and to help increase performance of the vw tdi even more, one of two things can be done. One a mufflerectomy can be performed in which the muffler and resonator are removed and a straight pipe is put in their place. This opens things up a little and removes the baffling of the muffler so that the exhaust can flow more freely. The second tdi exhaust option is the aero turbine muffler. The inner design of the muffler works the same as a jet engine to increase the flow of exhaust even more than what a mufflerectomy does. The inner design splits the air via an air foil. The faster air moves through the center and the slower air moves around the outside of the air foil, the slower moving air then re-enters the main air stream through inlets that go down the sides of the mufflers inner cylinder. This recombining creates a vortex that lowers the tone of the exhaust and dramatically reduces back pressure by increasing the flow of all the exhaust that moves through it.
Increasing air flow into the engine will help more of the fuel to be combusted and to help extract more power out of each molecule of fuel. Most cold air intakes have a large cone air filter that is able to move up to 300% more air than the stock air intake system. This makes the cold air intake an important part of any vw tdi performance package, sadly though cold air intakes are not currently made for all the vw tdi models. Another modification that helps with air intake and exhaust is water methanol injection. Water methanol injection is also known as chemical intercooling. It has a three fold effect on the diesel engine. It cools the intake charge which provides for more available air intake and the benefits of a higher positive pressure ratio (more power giving fuel can be utilized safely without high combustion temperatures). Two, the combustion of water also adds power and three; methanol is also a high octane fuel that adds more power. Water methanol injection typically lowers EGT’s by about 200 to 250 degrees on bigger diesels and is slightly under that for the vw tdi.
So in conclusion, to be able to build a real beast the modifications must be made from the ground up. After these mods are made then a bigger turbo and intercooler could be added as well as upgrading the clutch and other components to help hold the added power.
The TDI Chip and TDI Exhaust are the beginning of any VW TDI Performance upgrade.- Nathan Young
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