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2011 ZX10r Dyno comparo with BMW by Redline Motorsports
r1ninja:
--- Quote from: HammyUK on December 25, 2010, 04:15:35 PM ---
--- Quote from: Redlinems on December 24, 2010, 03:58:32 PM ---Gen 1 makes 149-ish stock and 153-ish (not all bikes run exactly the same) with a slip-on and Gen 2 is pretty much the same although Gen 2 feels like a fat pig to ride. Up to this last version, I think Gen 1 was the most fun to ride.
--- End quote ---
Have to call bollocks on that - then Gen 2's make far more than that.
Only got to look at the figures around on here to see that.
Every gen 2 I've seen on a dyno has been over 160 with most towards 170.
Several are considerably over that mark.
--- End quote ---
Hmm never trust absolute figures on a dyno, they are great for referencing pre/post mod figures or bike to bike comparisons for same dyno same day
HammyUK:
I've seen same day same dyno results plenty of times Andy and they are still higher than 150's for Gen 2's everytime by 10 - 15bhp at least.
As for not "being affected by artificial air pressure" - utter bollocks again.
The whole point of Ramair is that it increases internal air pressure, leading to a colder, denser charge and as such more power. Do you really think the manufacturers would spend the moeny they do on design and research if it didn't have an effect?
Any bike designed to run with it and then tested without it might as well have a sparkplug removed. It will overfuel without a PCIII or similar to compensate for the lack of air that the ecu thinks should be there at that rev range/speed.
I've personally seen the difference having that fan makes to the power curve and ultimate reading first hand sitting on my own bike whilst its run up - dropped from 174 to around 165 simply by hitting the off button. The fuel curve went crazy and it was ridiculously rich by around 20% over 8k.
Anyone who doubts it works or doesn't make a difference needs a lesson in flow dynamics.
Get Rob to do a demo on the next meet at Mallory on the difference - the need for that fan to simulate the increase in air pressure is the reason that his workshop is always full of race bikes and why the race teams that have their own dyno's use high pressure fans. I have watched the Vivaldi teams dyno in action and they have one fan for cooling and another for causing a high pressure area at the front of the bike.
r1ninja:
half right, sure they wont show max power without ram air but they wont overfuel either, the f.i. uses airbox pressure sensors not the bikes speed to fuel it. Proper dynos with ram-air like Crescent's are often ridiculed on forums for their "optimistic" power figures. The usual fan that all dynos have is for cooling air through the rad, to get proper ram air pressure you need a very specialised dyno. A lot of normal dynos fiddle air correction factors to get higher peak numbers. I'd say their dyno is bang on, 170 odd for a bee emm with no ram air is about right
HammyUK:
Andy - I'm not on about the "usual fan" for cooling. I'm on about the high pressure fans that RJS, Vivaldi, etc have specifically for the ramair and setting up the fuelling to take it into account.
I'm aware of the air pressure sensors, but stating 150ish on Gen 2's is utter shite.
Ultimately though the fuelling wil be out at top revs without ramair as the ecu can only cope with so much outside of its generic mapping.
r1ninja:
Nope i reckon their figures are spot on. kawasaki claim 181 bhp for the 2006. take away the usual 12% transmission loss and you get 160 bhp. Without ram air you'll be in the one fifties
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