Benefit of removing V-boost ?...
What is Stage 7 ?...
I thought there was only stages 1 + 3
Assuming correct jetting and a good exhaust (supertrapps for the rumble, custom headers) which is best ?
An engine is full of compromises - if you tune it for low down power then the top end will sufferer and vice-a-versa.
A carburettor works best when the air speed going through it is high as this will atomize the fuel better.
One of the factors that determine the fuel speed is the diameter of the venturi.
The smaller it is the faster the air will have to flow for a given volume. However, there is a maximum volume of air that a fixed diameter choke can flow.
Now we come back to the compromises - if I fit a smaller diameter choke then I will get good atomisation of fuel at low revs but it won't be able to satisfy the demands at higher r.p.m.
Conversely, if I fit a choke large enough to satisfy the demands at maximum revs then at low speed the air speed will be too low and you will loose at the bottom end.
Those cunning Yameringha chaps realised that if they linked two carbs together then at low r.p.m. you use one of them but as the revs rise and you need more air then open up the butterfly between the two carbs so that the second one gives the additional mixture needed.
Genius!
Dyno print outs with and without V Boost demonstrate that the V Boost set-up will produce more low down power.
Another disadvantage of removing V Bosst is how to balance the carbs.
To answer your question, IMHO, there isn't any benefit and some disadvantages.
To your second question, it is a re-jetting of the carbs to maximise power at WOT. Note that Dynojet say this is for the race track?
I suspect that this is to (reasonably) cover their arse from owners who would complain about the performance at low rev running.
If you ride with the throttle pinned all the time then S7 may be the way to go, otherwise one of Sean's jet kits would probably get the best out of the motor without the need to compromise.
