Joined
·
2,515 Posts
OK - I have been reading and so far not really come up with much geeky detail for my restless mind.
We know the 790D is a Euro4 bike - and so will be "made to comply".
We know that Coober/AR and others have solutions. We know these solutions may improve things.
But I am missing a something - I don't know what it is, but I "know" it's there. And I have been seeing through smoke and mirrors my whole lifetime.
Like 99% of tuners - most tune at WOT (Wide Open Throttle). This is fine if this is how you ride. I'd guess though that most of us simply do not have the occasion to do so often. I'm not impressed.
I stumbled (again) across https://www.790dukeforum.com/forum/97-2018-ktm-790-duke-news/34-ktm-790-duke-dyno-tested.html#post52 - a post on here from May 2018.
The first curve is a typical Dyno chart
The above torque curve looks flat - but there is a very notable dip in torque on the road. The second set of curves is far more interesting. It is the power produced at a fixed (not WOT) throttle opening in all 4 modes. iirc 30% throttle.
I ask you to examine this and ask yourself. Why is there such an enormous dip in the power curves at 30% throttle? - I am pretty sure I know, but has anybody else realised. Note it is there independent of the ride mode employed. Even TRACK.
I would love to see that second set of tests repeated with ATOM, COOBER, PCV whatever. Because - That's where we'll really see what they do.
I'd also like to see a full mapping of AFR, torque, tps (or better still MAP) and rpm. I've looked and will keep doing so - but if anybody has them - PLEASE POST THEM. Because it is driving me potty.
I have seen this dip effect on other bikes that have been "made to comply". In one case an additional 30% of extra torque was retrieved from a similar dip very easily. Yes THIRTY PERCENT.
I wish I could get my mate Rob to take an interest in the 790. But he's dedicated to getting really silly bhp out of Triumph Rockets.
We know the 790D is a Euro4 bike - and so will be "made to comply".
We know that Coober/AR and others have solutions. We know these solutions may improve things.
But I am missing a something - I don't know what it is, but I "know" it's there. And I have been seeing through smoke and mirrors my whole lifetime.
Like 99% of tuners - most tune at WOT (Wide Open Throttle). This is fine if this is how you ride. I'd guess though that most of us simply do not have the occasion to do so often. I'm not impressed.
I stumbled (again) across https://www.790dukeforum.com/forum/97-2018-ktm-790-duke-news/34-ktm-790-duke-dyno-tested.html#post52 - a post on here from May 2018.
The first curve is a typical Dyno chart

The above torque curve looks flat - but there is a very notable dip in torque on the road. The second set of curves is far more interesting. It is the power produced at a fixed (not WOT) throttle opening in all 4 modes. iirc 30% throttle.

I ask you to examine this and ask yourself. Why is there such an enormous dip in the power curves at 30% throttle? - I am pretty sure I know, but has anybody else realised. Note it is there independent of the ride mode employed. Even TRACK.
I would love to see that second set of tests repeated with ATOM, COOBER, PCV whatever. Because - That's where we'll really see what they do.
I'd also like to see a full mapping of AFR, torque, tps (or better still MAP) and rpm. I've looked and will keep doing so - but if anybody has them - PLEASE POST THEM. Because it is driving me potty.
I have seen this dip effect on other bikes that have been "made to comply". In one case an additional 30% of extra torque was retrieved from a similar dip very easily. Yes THIRTY PERCENT.
I wish I could get my mate Rob to take an interest in the 790. But he's dedicated to getting really silly bhp out of Triumph Rockets.