thank you for the reply ...I'll leave well alone !!!I can tell you that removing the Catalytic Converter does NOTHING to improve the power! Pretty much stuck with what you got. The DN-01 wasn't that big a hit so research/improvements wasn't a high priority. (People just didn't care!)
No endorsement because I haven't done it but Dynojet makes a tuner: https://www.dynojet.com/power-commander-v-for-honda-dn-01/Has anyone managed to boost the power of the DN-)1 and if so how, was it simple and was it worth it......any help would be greatly appreciated
Your comment ''annoying notch' .......I have noticed what I thought to be a blip , miss fire call it what you may ....happening sometimes for a split second and I mean for a split second but still noticeable .....I just put it down to the bike doing its thing. Is this the same 'notch' characteristic that your bike and mine are sharing if so at least hat would explain it.I did installed Dynojet PCV (model 16-010) on DN. But not for extra power. Actually I think trying to pull out those spare ponies from DN is practically meaningless, the HFT will smooth out the ambition about extra hp.
But - there is a noticable annoying notch in the power curve at speed around 85 kmh/3500 rpm making the bike almost stall (am I only one who have noticed this?). I tested on two DN's and both acted same way. This notch in Honda's original fuel map is arranged for environmental reasons, they measure noise and pollutions at this point, therefore the fuel mixture is set to very lean.
So I decided to straighten out this annoying notch from power curve. And only way I see to do this reasonably is to use Dynojet Power Commander paired with Dynojet Autotune add-on.
The Autotune is closed-loop FI automatic adjuster and it will make fuel map adjustments based on its own O2 sensor in real time, adapting the FI-system specifically to drivers style. Tuning in dynobench will not give such a real-life-driving based results I was searching, the Autotune is needed here. Till now the results are promising, I can share developed fuel map for Dynojet PCV if anybody is interested. The whole process was quite interesting and a bit challenging for me. I'll desribe it closer if somebody may be interested.
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Obviously it is the same thing I'm talking about. It lasts for a short moment, the engine makes short "sneeze" as the engines usually do when fuel mixture is very lean and then continues to work on. It happens at about 3500 rpm, speedometer reading 85 kmh (52...53 mph) and when throttle is open very little. Not accelerating, but going on flat surface with steady speed.Your comment ''annoying notch' .......I have noticed what I thought to be a blip , miss fire call it what you may ....happening sometimes for a split second and I mean for a split second but still noticeable .....I just put it down to the bike doing its thing. Is this the same 'notch' characteristic that your bike and mine are sharing if so at least hat would explain it.
I would be interested in finding out what Honda has to say about the 'bump!' (What causes it) I ran a 2011 NT700VA for many years with the exact same motor and NEVER had a 'bump!'I say the 'bump' is not appearing from tranny, the HFT is working very smoothly on both acceleration and deceleration. If you close fully the throttle on deceleration the 'bump' will not appear, you can hear only some popping sound caused by PAIR valve being opened and letting some fresh air to exhaust and this air is reacting with fuel leftovers in exhaust.
So the 'bump' is related to fuel mixture under certain conditions.
Here is a power curve of DN from dynobench (rear wheel hp). It looks very nice, no notches or bumps to be seen. But it is made on acceleration with full throttle, as the dyno guys usually do while hunting extra horses, not at road driving conditions nor at speed 85kmh/@3500rpm/small throttle steady driving.
The bike had Power Commander installed and they supposedly made some power tuning, but as they left the OEM O2-sensor in system, the result is nothing.
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Do you have somebody to ask about it? Probably Honda today does not want to know much about the DN project at all... Probably they want to bury and forget it, designers made harakiri times ago... Deciding from spare parts availability already fading away. No more updates coming from Honda for DN that's for sure.I would be interested in finding out what Honda has to say about the 'bump!' (What causes it) I ran a 2011 NT700VA for many years with the exact same motor and NEVER had a 'bump!'
Guess I'll just to give Honda at the home office a call then or maybe in Japan. (You know how meticulous the Japanese are.) And isn't it strange that this 'bump' doesn't occur when you use the manual mode for shifting. (Same engine, right!)Do you have somebody to ask about it? Probably Honda today does not want to know much about the DN project at all... Probably they want to bury and forget it, designers made harakiri times ago... Deciding from spare parts availability already fading away. No more updates coming from Honda for DN that's for sure.
Engines on NT700V and DN-01 may look similar at first glance, as also on XL700V. But looking closer the similarity ends at cranckshaft-piston area. Most obviously these bikes have pretty different ECM's with different software in those.
Even the cranckshaft is in NT and DN engines is turned over for 180 degrees:
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