For any of you guys with a T34/0.48.......

What rpm is the boost threshold generally and when does it run out of puff? How do you find it for driveability?

I'm on a T34/0.63 at the moment and it doesn't start pulling 'till about 3200rpm the engine is only 7.5:1 CR and feels too sluggish low down (could that be mapped out with more ignition?)

Was hard work keeping up with an ST170 on twisty roads no long ago!
So I'm thinking of going down a housing size.....

803's
RS200 spec intercooler
std head + cams
3" exhaust
1.5 bar held