I recently had my bike tuned for the Akrapovic slip-on and no cat setup. It has an OEM air filter and no other mods to the engine. The tune was done with the stock ECU, no piggyback systems.
The guy who did the tune said he rarely saw such linear graphs and apparently didn't have to tweak it much.
I don't really care too much about the numbers, but I'm very pleased with the graphs and the bike is super smooth when rolling on the throttle. Though the numbers don't look too bad either
Interesting how do you get ram air on and off??? Do they use Fans to blow in the ducts...When are the ducts really effective somewhere around 100mph???
Interesting how do you get ram air on and off??? Do the use Fans to blow in the ducts...When are the ducts really effective somewhere around 100mph???
John
I didn't watch as they did their magic so I'm not sure. But yeah, I would assume some kind of fan is used to simulate the ram air effects that occur as you gather speed. I have no idea at which speed this actually begins to take effect. Some of the experienced people on here can probably weigh in and enlighten us.
That looks great... my dyno run came out about the same. Very flat bottom end and peak around 160+. The best part is how strong it pulls and how linear it feels (when I do my part shifting). Well worth the money to have it done.
I think those radiators are there, in order to provide cooling to the motor and exhaust components. Providing a stream of air moving at close to 300km/h to the intake ducts would likely not be a simple task, so I think it more likely that the figure is caluclated, probably based on sensors reading the barometric pressure and air temperature and the theoretical vehicle speed, as provided by the dyno.
Quite possible. I didn't actually see if they had a set-up to replicate the ram-air effects, but I think I've seen pictures of it online before. Perhaps Oldgixxer, AnthonyD or someone else with a lot of experience with tuning can chime in.
I think those radiators are there, in order to provide cooling to the motor and exhaust components. Providing a stream of air moving at close to 300km/h to the intake ducts would likely not be a simple task, so I think it more likely that the figure is caluclated, probably based on sensors reading the barometric pressure and air temperature and the theoretical vehicle speed, as provided by the dyno.
Hi, I have also used Hestmann both for my street and trackbikes. He for sure use fans to feed air to the intakes. The fans and wind force is calibrated to measured speed of the bike. The fans feed more air as the speed increases to replicate ram air effect.
Hi, I have also used Hestmann both for my street and trackbikes. He for sure use fans to feed air to the intakes. The fans and wind force is calibrated to measured speed of the bike. The fans feed more air as the speed increases to replicate ram air effect.
Have you seen sealed tubes of some sort feeding the air straight into the air ducts? A fan just blowing in the general direction of the airbox, would have to create a small hurricane inside the dyno room, in order to simulate the proper conditions, which is not very practical, technically or otherwise.
I wish bikes had Mass Air Flow sensors like cars do. You can make it a little richer, to compensate. The difference in HP between 12.5 and 13.0 afr on the dyno with no ram air affect is negligible. :cheers
But you can't simulate ram air by blowing 150 mph air at the bike to simulate riding at that speed. That air would be very turbulent whereas the air that the bike is travelling through at 150 mph is pretty still. Not like for like
The tuner I used has one of only a couple ram air dynos in the country. I will see if I can post a picture of it on there. He said the air is connected to the dyno roller, so the faster the roller goes the air is matched. I was in there when it was done and there was a huge amount of air and noise coming from the air pipes. They were directed on to the ram air intakes at the front of the bike. You can see the pipe at the front of the bike before it put in place.