April 10th, 2014, 07:04 PM | #1 |
ninjette.org member
Name: Mitch
Location: Brisbane, AU
Join Date: Feb 2012 Motorcycle(s): '10 Ninja 250 Racer Posts: 95
|
AFR for most power
Whats the best AFR for power on these motors? I had a 250 and when dynoed it produced most power at high 13 (13.5+) to low 14:1 ratios.
I have an auto tune set up and wondering what the best ratio for power is
__________________________________________________
#77 |
|
April 10th, 2014, 08:15 PM | #2 |
Long Time Rider
Name: Blue
Location: Charlotte, NC
Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.
|
You may want to read this thread. https://www.ninjette.org/forums/show...8&postcount=17
https://www.ninjette.org/forums/show...9&postcount=28 |
|
April 10th, 2014, 08:17 PM | #3 |
ninjette.org member
Name: Ryan
Location: Metro Detroit
Join Date: Dec 2012 Motorcycle(s): '13 Ninja 300 :: Pearl White Posts: 37
|
As a rule of thumb, peak torque is typically from 0.87 to 0.90 lambda. When talking in 100% gasoline speak where Stoich is 14.7:1, peak torque is usually 12.8 to 13.2:1. This of course depends on the combustion chamber shape, flame propagation speed, BSFC, VE, and a whole bunch of other factors.
Start with a 0.88 lambda target, and feel free to twiddle it a bit on the dyno to see where the sweet spot is at each programmable RPM cell in your Dynojet interface. Since you're tuning a naturally aspirated engine, it's unlikely you'll need to run any richer than 0.82 lambda or 12.0:1 AFR unless you're getting knock. Good luck!
__________________________________________________
|
|
April 10th, 2014, 08:22 PM | #4 | |
ninjette.org member
Name: Mitch
Location: Brisbane, AU
Join Date: Feb 2012 Motorcycle(s): '10 Ninja 250 Racer Posts: 95
|
Quote:
__________________________________________________
#77 |
|
|
April 10th, 2014, 08:37 PM | #5 | |
Long Time Rider
Name: Blue
Location: Charlotte, NC
Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.
|
Quote:
https://www.ninjette.org/forums/show...618#post266618 |
|
|
April 10th, 2014, 08:40 PM | #6 |
ninjette.org member
Name: Ryan
Location: Metro Detroit
Join Date: Dec 2012 Motorcycle(s): '13 Ninja 300 :: Pearl White Posts: 37
|
Remember to install your wideband sensor upstream of the catalytic converter if you're still running one or you won't get accurate O2 readings.
__________________________________________________
|
|
April 14th, 2014, 04:06 AM | #7 |
ninjette.org guru
Name: scott
Location: australia
Join Date: Jan 2012 Motorcycle(s): 2012 ninja 250r se Posts: 435
|
o2 is only half of the tuning(not really other factors involved), you need to look at changing ignition timing aswell.
If the stock ECU can change the pre-programmed timing settings, if not have to look into ignition control. Changing "o2" cleans up the hills and valley's and corrects the AFR, and a power increase or loss could occur. |
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Slightly used AEM UEGO Wideband AFR meter + sensor | Momaru | Motorcycle-related | 33 | August 19th, 2013 11:21 AM |
help plz. wideband afr fine tuning the carb | MikeJames21 | 2008 - 2012 Ninja 250R Tech Talk | 20 | June 12th, 2012 07:47 AM |
Factory Pro Jetkit and AFR's | abhijitz | 2008 - 2012 Ninja 250R Tech Talk | 8 | April 7th, 2012 11:25 PM |
[roadracingworld.com] - Live Webcast: OTT World Superbike Preview Show From South Afr | Ninjette Newsbot | Motorcycling News | 0 | May 14th, 2010 10:10 AM |
[roadracingworld.com] - Fonsi Nieto Will Fill In For Injured Neukirchner In South Afr | Ninjette Newsbot | Motorcycling News | 0 | May 12th, 2009 11:10 AM |
|
|