The M90 does look better for low boost, but if I increased it even a bit it would become less efficient, and we all know that once I start fidling with boost, the only way is up!
Unfortunately though, the contact I had that was trying to shift his M112 cheaply has had a change of heart, so it's going to be a long time before I'm able to afford to do this now... Sorry for the wasted time but it's quite a good tech article any way!
Tom.
Rover 3.5 V8 landy - Completely rebuilt and purring... Now awaiting a good tune!!