Ideal Air/Fuel Ratio for dyno tune

[hayabusapower]

I'm getting my 2006 Hayabusa dyno tuned next week. My mods are Full TRS yoshimura exhaust, BMC raceair filter, airbox mod, short velocity stackand and Bazzaz ZFI. What the best Air/Fuel Ratio target in my bazzaz software?

[knecum]

12.8

[fvance]

 

[FASBUS]

 12.8:1 may not make most power #'s on dyno , dont get caught up in that. That a/f will get you close to optimum performance in real world use.

[knecum]

12.8:1 may not make most power #'s on dyno , dont get caught up in that. That a/f will get you close to optimum performance in real world use.

Exactly!!!!!!

[hayabusapower]

Where I'm getting my bike dyno ther recommending me 13.1

[knecum]

Where I'm getting my bike dyno ther recommending me 13.1

You asked us right?

[FASBUS]

Where I'm getting my bike dyno ther recommending me 13.1

Do what he says...... You may make some DYNO power. Ive seen equivalent to 12.5:1 dyno a/f be optimum real world , 12.8 and 13 are not very far different however different , many dynojet trained tuners shoot for 13.2 - 13.5 which isnt bad if you race on the dyno. (might as well make sure to leave your lower fairings on and not use ANY external cooling fans + make sure dyno air is as stagnant and as heat saturated as possible) Damn I think Im losin it...

[FASBUS]

 Of course those figures only apply to naturally aspirated bikes... Most know this here but just wanted to be clear.

[Shamrock]

just food for thought. Does your Ram air work on the dyno? It doesnt so you need to tune for it when on the dyno so when you ride.

[ECS Walter]

You tune the bike to what the bike wants not a set A/F ever.......... If your tuning on the dyno depending on the gear your ecu corrects for ram air. Find someone who has experience in both worlds and knows what your going to see (logging) outside from what is done on the dyno.

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[glenn71]

On the dyno i use 13.0:1 becomes 13.5:1 on the
Strip in 4 th gear and i shoot for about 12.6:1
On the strip over about 8500-9000 which
Is the gearchange drop down rpm point.i leave
Under those rpm alone as the motor
Tends to spin up quicker down low when its
In the low 13,s.in the mid 12,s in the top end
It holds peak power longer on the road and
Punches harder into the next gear on the gearchanges.
When its over 13.2 up top it noses over past
Peak power and gearchanges with no real
Kick to it.so basically add 10% over 8500
From dyno optimum and itll mph like
It should.ive done this on our 91 (your 87)
And our 98(your 93) and now on e10(89 equivalent)
With ethanol.just ran 153.9mph out if a stock
Length mild 1299cc gen1 doing as above.

[f398]

Would be interested what you guys think A/F ratio should be for a Gen 2 turbo engine say up to 10 pound boost asuming comp was dropped to about 10 to 1? (was impressed by your knowledge on A/F ratio)

[FASBUS]

Would be interested what you guys think A/F ratio should be for a Gen 2 turbo engine say up to 10 pound boost asuming comp was dropped to about 10 to 1? (was impressed by your knowledge on A/F ratio)

Dyno tune to approximately 11.7:1.......

[FASBUS]

 Good post Glenn71..........

[ECS Walter]

Would be interested what you guys think A/F ratio should be for a Gen 2 turbo engine say up to 10 pound boost asuming comp was dropped to about 10 to 1? (was impressed by your knowledge on A/F ratio)

What fuel, what timing, how big of turbo?? Without that info, it's guessing.

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[f398]

GT 20 with 7 pound boost internal waste gate, standard ignition, C16 fuel, keep max revs to 11000, have plenty of room for intercooler air to air. ported head, valves and springs replaced with new gen 1 (s/steel valves).  what do you see wrong with this plan? Any advice from some one who has done exactly this would be great?

[ECS Walter]

Your turbo might be a wee small.

[f398]

Yes i agree, but i am trying to keep my torque curve as wide as possible, I am trying to get 35 to 45 extra hp and 20 to 30 extra ft pounds of torque. Am I on the right track?  (this motor is not for drag racing or land speed).

[BATTMAN]

no need to use c16 on 7lbs of boost.

[f398]

So do I just use premium unleaded?

if yes, what is my safe limits?

 if I leave comp standard what boost limit and with which fuel or do I still have to drop comp?

When the motor is raced it is ran really hard for about 30 to 40 sec then rest for 30 to 40 min untill next run. (this may help to know how it is to be used)

[BATTMAN]

premium will be fine for 7lbs.  you wont experience detonation if it is tuned right at 7lbs.  some say you are safe on a normal compression motor up to 9-10 lbs on premium fuel.  Are you doing landspeed racing?  If you are, then your bike should be tuned for that.

[FASBUS]

 Any answer to this question will be theoretical approximation.. I would recommend tuning to 11.7:1 on the dyno then dataloggin for peak mph..
 If your not on the safe side of compression/octane/timing be sure not to run lean( on second thought be sure not to run lean no matter what) , melted aluminum sucks. glenn71 has a good approach in my opinion I would just have your base dyno tune a/f 11.5:1 - 11.8:1 for the forced induction bike.

[f398]

Ok thanks for the help, will let you know hoe it goes.