Turbocharged 600cc Bike Engine

[Kezzieboy]

So, at uni I'm part of a project called formula student, in which this year we built this:

UBR17

Which did pretty well, given our budget (19th out of about 100 overall, 6th UK team), however it was a pretty 'safe' build, we didn't try anything particularly innovative.

For this reason, next year I want to strap a turbo to it. Now, there are other teams who have done so, with excellent results, but I want to do this properly. As such I have a couple questions/ideas for discussion. We run a Yamaha R6 engine, and competition rules require that we fit an inlet restrictor of 20mm. The turbo has to be placed after this restrictor as such: "B8.7.2 The restrictor must be placed upstream of the compressor but after the carburetor or throttle valve. Thus, the only sequence allowed is throttle, restrictor, compressor, engine."

1. Recommend me a turbo. Some teams have had success with a GT12 on a single cylinder engine, and Dublin run a turbo'd 4-cylinder, but only disclose that it's a Borg-Warner turbo, not the model, looks like this:



2. What about VNT? It could be an awesome project, and I'm fairly sure it has NEVER been done on a formula student car before. We may have 'acquired' what appears to be a GT15V, if there is such a thing. I will dig out exact part numbers when I can.


So, what do we think? Is it worth it, of will the restrictor make it pointless?

Discuss!