I've been doing research into upgrading to TD05s. Here is a good article that I ran across. I've considered the T3 for a while now since they are so easy and cheap to get. In my area I can buy two used T3s for $250 or pull them off of junked cars myself for $130 at Pick-N-Pull. It is for Volvos but turbos are still the same. I have noticed that T3s are air cooled.

That may be a problem for the rear turbo on our cars if I choose to go that route. COMPARISON between a Garrett TB03 and Mitsubishi TDO5 Turbocharger Question by Anthony Hyde: I compared the Garrett TB03 & the Mitsubishi Turbo units on the workbench and they are dimensionally nearly exactly the same. The compressor blades were quite different though. Component Based Software Engineering Heinemann Login.

The Garrett had the tricky convoluted spiral, whereas the Mitsub had the old style straight blades. Do you have any comment or knowledge on the Garrett vs Mitsub change? Answer by Paul Grimshaw in Canada (author of Volvo Performance Handbook): The difference which you noted in the impeller design between the Garrett TB 03 and Mitsubishi turbo chargers is very important and helps explain the different ways in which these turbos work. The Garrett's convoluted spiral blade design is known as a backward-curved compressor impeller. In this design, the blade elements are not arranged in a strictly radial pattern, but are curved backward from the direction of rotation. This blade style is designed so that the air entering the impeller is at the same angle as the pitch of the blades. This reduces the shock losses at the inlet and allow the impeller to operate very efficiently at high rotational speeds.

Find helpful customer reviews and review ratings for The Volvo Performance Handbook at Amazon.com. Read honest and unbiased product. By Paul Grimshaw. I am looking for a copy of Paul Grimshaw's 'The Volvo Performance Handbook.' Anything out there? Walter wbnash@msn.com. Turbobricks - High Performance Volvo Club. Volvo Performance FAQ's (chapter from Paul Grimshaw's book: The Volvo Performance Handbook 1999) 'Volvo. Which year/model/engine most reliable. Engines/bad engines and a few anecdotes concerning Volvo powerplants. Paul Grimshaw. 'The Volvo Performance Handbook'.

Despite their efficiency, however, these type of impellers do not exhibit as high a pressure ratio as radial-patterned impellers. Furthermore, centrifugal force at high speed tends to bend the spiral blades at their roots.

So in essence, a turbocharger equipped with a backward-curved impeller helps an engine produce power in the upper-end of its rpm band (where its high efficiency in best appreciated), but is subject to severe stress which may affect its lifespan. [ Extra comment; A turbocharger equipped with a backward-curved impeller reduces the shock losses at the inlet and allows the impeller to operate very efficiently at high rotational speeds that in-turn helps an engine produce power in the upper-end of its rpm band (where its high efficiency in best appreciated.] The straight, or radial impeller as used in the Mitsubishi, provides a higher pressure ratio at low rpm than the Garrett.