Yeah- no baffles. Would that would cause the dip?
mate, thats quite a slump, specially in torque, which is what drives these beasts.
Id suspect pipes, my dyno man here on the Gold Coast does return visits for fine tuning for $50 a throw, after the initial $400 setup tune.
If you've got that sort of deal going you can afford to experiment.
If not it can get very expensive....
Other alternative is the 'real world' of the drag strip, if you have a local track that has test n tunes you can gauge your performance changes by your timeslips, I'm sure HC will back me up there..
Initially though its nice to have it as good as possible on the dyno, that's why I hope your bloke can be approached for cheaper 'fine tuning' sessions...
First thing Id try is slipping the baffles back in, check out my dyno graph with Freedom Performance pipes and there's no slump at all and over 100 ft/lb from 2500rpm .
I note your graphs show the bottom bar ar road speed not revs, though there is a direct correlation we have to guess as to the revs.
It looks to me however like your motor is slumping where it should be at its best though.
As to your oil question I'm about to ring Penrite, as if I can get better protection from going to their full synthetic Aussie oil then I will , as long as my clutch wont suffer from going full synth
I'm quite happy with their semi synth but I'm open-minded to any improvement that wont jeopardise my motors integrity.