project number 2 twin turbo :-) how she looks now (-:

[Dave]

Love the redneck approach, just remember that to compound all the flow has to go through both blowers - so your secondary needs to be able to cope with the flow of the primary. Alternatively if you're using a smaller blower to spool a larger one without compounding arrangement then you'll need to add in a bypass but this gets complicated during the transition between the two. Looking back now though at whats been done to XUD's in the past year or so I would 10000% concentrate more on head flow than using two turbos to make insane boost. Will be interesting to see what you come up with on this one though

---

Oh yeh, also forgot to mention the most cruical and important part of any compound turbo setup, the control. Obviously you have to maintain x amount of pressure difference accross each turbo which isnt as easy as it sounds with manual boost controllers because you have to consider the signal to the controller for the smaller blower is going to be at a higher pressure also. Its easy to do compound configuration with seamless takeover where the larger turbo takes over the smaller one and renders it useless but you want to have the smaller one making even more boost for it to actually be compounding. This is when having electronics involved makes it a hell of alot easier, but there are crude not-so-seamless ways of doing it mechanically.