Air fuel ratio ? - Kawasaki ZX-10R.net
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post #1 of 19 Old 12-27-2008, 08:16 AM Thread Starter
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Air fuel ratio ?

Does anyone know the best recommended air fuel ratio for the 06-07 zx10 ?
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post #2 of 19 Old 12-27-2008, 09:42 AM
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There is no single number that can answer this, and any attempt to map it to a single air/fuel ratio throughout the entire range of load and RPM will not give best results.

At part load you want around 15:1 for best fuel consumption and to not wash oil off the cylinder walls with excess fuel. At full load you want 13-ish. A few tenths one way or the other will make scarcely any difference.


Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!
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post #3 of 19 Old 12-27-2008, 10:00 AM
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....it depends on how you measure it too. Measured on a stationary dyno, we mapped down to 13:1 WOT and it felt prety good. I actually had it mapped 12.5:1 from 9K rpm up (for a small nitrous shot) and it picked up trap speed consistantly in the 1/4 mile WITHOUT the nitrous.

Ivan mentioned this in another thread, and I have to agree with him: the A/F line should be a slightly down sloping line (measured from left to right...) at WOT... starting in the neghborhood of 13.:1. :)

As for the rest of the map (sub WOT).... good luck with that. It's a pretty complicated affair that is better seen in person the first time (IE: find a good dyno tuner!).

Attack life... it's going to kill you anyway.
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post #4 of 19 Old 12-27-2008, 02:55 PM
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Is 15:1 not too lean?

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post #5 of 19 Old 12-27-2008, 05:34 PM
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for wide open throttle it is.... the leanest I'd go is 13.3 for wide open cruising speeds about 14.5:1
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post #6 of 19 Old 12-27-2008, 06:21 PM Thread Starter
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so the factory ecu's dont have an set ratio ?
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post #7 of 19 Old 12-27-2008, 08:52 PM
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they do but they will vary with mods we dont have a closed loop system so the bike never knows what kinda of air fuels the ecu is making the bike have.
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post #8 of 19 Old 12-27-2008, 09:50 PM
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Quote:
Originally Posted by SpazOnaZX View Post
....it depends on how you measure it too. Measured on a stationary dyno, we mapped down to 13:1 WOT and it felt prety good. I actually had it mapped 12.5:1 from 9K rpm up (for a small nitrous shot) and it picked up trap speed consistantly in the 1/4 mile WITHOUT the nitrous.

Ivan mentioned this in another thread, and I have to agree with him: the A/F line should be a slightly down sloping line (measured from left to right...) at WOT... starting in the neghborhood of 13.:1. :)

As for the rest of the map (sub WOT).... good luck with that. It's a pretty complicated affair that is better seen in person the first time (IE: find a good dyno tuner!).
Are you talking about Ivan at Ivan's Performance?
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post #9 of 19 Old 12-28-2008, 09:37 AM
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Originally Posted by magzx12r View Post
Is 15:1 not too lean?
In cruising conditions, where the engine is running at a small fraction of its rated power (read: heat) output, you are never going to burn a valve, and unless the ignition timing is way out of whack, you are never going to run into detonation.

Best fuel consumption is normally in the 16:1 range, but with conventional ignition systems, that's flirting with misfire particularly when engine load suddenly changes, and 15:1 will give a better margin against that.

Your car has a closed-loop EFI system that runs it at 14.7:1 throughout almost the entire speed/load range - everywhere except full throttle high revs. The engine in your bike is fundamentally no different.

Remember the Honda Insight? Under steady throttle conditions, those ran as lean as 24:1 ... but they would go to 14.7 the moment the engine load changed to avoid misfire.


Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!
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post #10 of 19 Old 12-28-2008, 04:55 PM
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Originally Posted by edouble View Post
Are you talking about Ivan at Ivan's Performance?
yea... he mentioned it in one of his TRE threads.... about the 08 I think. It pretty much applies to any ram air bike IMO. I've seen the actual results from doing somyself; that usually makes me a believer.

Attack life... it's going to kill you anyway.
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