Eaton TVS r1320 supercharger on Cayenne or Touareg hybrid – can it be swapped for a power upgrade? « EVWAudi.com – vw touareg hybrid forum, vw jetta hybrid forum, and porsche cayenne hybrid forum

Eaton TVS r1320 supercharger on Cayenne or Touareg hybrid – can it be swapped for a power upgrade?

The Porsche Cayenne S Hybrid, VW Touareg hybrid, and the just announced Porsche Panamera hybrid all use the same Audi S4 supercharged engine. With older supercharged engines, it was as easy as changing the pulley to increase boost and increase power. Does this this work on the engines in the aforementioned models? Will a chip tune also work? This is part 1 of an ongoing series of articles of how to increase the power of your hybrid.

Long story short, at this time, a smaller pulley will not increase the power of your VW Touareg, Cayenne, or Panamera hybrid.

The pulley is small to begin with so it would be a challenge to make it much smaller. Eaton makes the TVS r1320 supercharger that is on the hybrid and S4 engine and does not make smaller pulleys for it. Each supercharger is designed to operate most efficiently within a performance envelope (if you chart effiency on a graph it forms a “box”, really more of a blob) and going outside of the envelope is inefficient. Physically, the supercharger might be able to make up to 20 psi but it’s ecu limited to about 11.6 psi (0.8 bar). Any extra is recycled back to the supercharger through a bypass valve. ECU changes can close this valve and direct all the air to the engine. The reason the bypass valve is often open is to complement the design envelope of the supercharger with the engine performance for both high and low end power. Below is a video showing the insides of the supercharger showing the bypass valve.

Below is the compressor map for the r1320 supercharger (from eaton.com)

Some tuners for the Audi S4 have made up to 420 hp with just a chip and tune so I don’t see why the hybrid engine can’t be tuned as well. However, will the hybrid motor’s decoupler stand up to the abuse? The decoupler is essentially a clutch – can it hold the extra power? This is completely unknown and other than the additional engine tuning, will be the unknown factor in tuning the Cayenne Hybrid or VW Touareg Hybrid.

See the next article for more information on the supercharger and chip tunes.

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This entry was posted on July 31, 2010 and is filed under Porsche cayenne hybrid, VW Touareg hybrid, how the hybrid system works, power upgrades. You can follow any responses to this entry through RSS 2.0. Both comments and pings are currently closed.