A/F vs Gearing

[badzx14r]

I know there some smart people here so lets discuss this ...this is what i know ..got a custom dyno tune with 18/42 gearing 94 degree day A/F 11.5 @WOT Speedo is dead on ...rode bike for 2 weeks with this set-up ...everything perfect except clutch couldn't handle all the gearing on the big end ..thats another issue ..don't think on that issue that only told me i need a lock-up .. so today i made a gearing change 17/45 big change ..went out and rode bike 70 degree day and bingo A/F IS 10.0 @WOT got a shudder and speedo is off around 15% faster .. got a multi map switch and i switch to a leaner map and bingo corrected..

NOW THAT LEAVES ME CONVIENCED THAT GEARING OR SPEEDO CHANGES THE MAPPING OR how the fuel is scaled thru the rpm

[nitrousbusa569]

the A/F changes with gearing.....in order to automaticly fix the problem, the bike would have to have some osrt of ram air compensation for different gearing....otherwise you would have to change the map everytime you made a big change in the greaing.....just my .02 hope it helps....

[gixxre750]

the A/F changes with gearing.....in order to automaticly fix the problem, the bike would have to have some osrt of ram air compensation for different gearing....otherwise you would have to change the map everytime you made a big change in the greaing.....just my .02 hope it helps....

why would gearing affect a/f ratio?

[michael mathews]

Maybe the ecu reads off the speedometer?And adjusts fuel accordingly

[michael mathews]

My PCV allows gear dependent fuel maps

[PAzYearazzUP]

If I remove the gear ratio of the fuel, or is the air cutter the mover.

If I remove the wire and get a code, did the redundant give a flying about what gear it is in?

If I start the engine, what was the gulp. If I WOT the throttle, what is the gulp?

Once you answer the absolute that intake valve closed on, you can move forward with some gear to 360° ratio when there was no gear pattern in a car with points or a bike with points and carb as well.

If you both matched RPM, stepped on the gas together = Are we in need of a gear mapiss my lungs is UP chuck a cup pull of cover my mouth is bend over laughing is wonder if you got that proportion figured out.

[stocker]

why would gearing affect a/f ratio?

not saying that this is the fix,but the factory ecu uses ram air compensation maps per gear,it is not measured by the speedo but rather by the map sensor,the faster you go the more air that gets "rammed" into the box the more fuel it calculates to overcome the added oxygen,and yes it is mapped per gear vs rpm,that may not be the answer to your problem,but i can post the acutal ecu binary to prove that the factory uses ram air compensation in is fuel algorithm.

[stocker]

Maybe the ecu reads off the speedometer?And adjusts fuel accordingly

on the busa the ecu does not use input to calculate fuel algorithm...

[stocker]

I know there some smart people here so lets discuss this ...this is what i know ..got a custom dyno tune with 18/42 gearing 94 degree day A/F 11.5 @WOT Speedo is dead on ...rode bike for 2 weeks with this set-up ...everything perfect except clutch couldn't handle all the gearing on the big end ..thats another issue ..don't think on that issue that only told me i need a lock-up .. so today i made a gearing change 17/45 big change ..went out and rode bike 70 degree day and bingo A/F IS 10.0 @WOT got a shudder and speedo is off around 15% faster .. got a multi map switch and i switch to a leaner map and bingo corrected..

NOW THAT LEAVES ME CONVIENCED THAT GEARING OR SPEEDO CHANGES THE MAPPING OR how the fuel is scaled thru the rpm

the fuel is scaled through a map that has fixed values based on a 17/40 gear ratio, rpm vs mph scale.

[stocker]

the factor ecu uses both 2d and 3d maps...i.e rpm/map,=2d,rpm/map/tps=3-d.....

[xclr82xtc]

ram air affect, your bike is sayin it needs to richen up for 100 mph, when in fact you are only doing 85....should make it fat. easies way to disable it is to pull the tubes out, it will still have plenty of air... or get your bike tuned on a dyno that has ram air fans like a cycledyn or somethin..

im not sure if there is a way to turn off ram air compensation in the speedo or not...ill have to get up with jetspeedz or ridge racer and ask.

[Dat Dood]

If I remove the gear ratio of the fuel, or is the air cutter the mover.

If I remove the wire and get a code, did the redundant give a flying about what gear it is in?

If I start the engine, what was the gulp. If I WOT the throttle, what is the gulp?

Once you answer the absolute that intake valve closed on, you can move forward with some gear to 360° ratio when there was no gear pattern in a car with points or a bike with points and carb as well.

If you both matched RPM, stepped on the gas together = Are we in need of a gear mapiss my lungs is UP chuck a cup pull of cover my mouth is bend over laughing is wonder if you got that proportion figured out.

Can anyone translate this into English or a dialect of it?

[Dat Dood]

Seriously tho, this is a good point. Does anyone make a speedo healer or something similar? if so, that may be the fastest fix versus having to remap for each gear with a guestimation of ramair effect.

[PAzYearazzUP]

Stocker? If the engine engine was hooked up to a water wheel and the transmission sliced off from the rear, will the engine still run to red line?

Back it up now.

If we still have that water wheel hooked up to the crank, the engine is basically out in the, 'Back40' pulling water from the canel.

How is it that there is no ram and the engine still can rev to max rpm?

Open book. Use any and all info, Stocker. You said you had some.

[xclr82xtc]

Seriously tho, this is a good point. Does anyone make a speedo healer or something similar? if so, that may be the fastest fix versus having to remap for each gear with a guestimation of ramair effect.

pull the tubes out, that takes away ram air, but yes a speedo healer will (SHOULD) work also...) im gonna find out if there is a way to turn the ram air compenstation off for tuning. ...that way you can cut it back on when your done with the dyno...