Hey, Ive got a yamaha FZ6 (600cc) engine an a Performance Electronics stand alone computer hooked up. Assuming that EFI tuning is all done the same way, what are the steps for filling in the fuel table values?

when you open up the throttle litle by little, the rpm does also, which the computer takes the values in a upwards diagonal across the table. how do you tune the other parts of the table, like 100% throttle at 1k-6k rpm and 0% at 5k-12k rpm?

 

basiclly its just driving the bike to fill up the tables. If the tables are vacuume dependant then try driving with a vacuume gauge to understand how to fill in the tables.

 

You use a loading dyno so that you can vary the load while keeping the rpm in the range you want to work, or vice versa.

However, even with a loading dyno, there are still edges and corners of the fuel table that you cannot touch. For those parts, you don't have to worry about it, since the engine will never use those parts of the table. You can just extrapolate. It may not be dead on, but it'll be close enough.

 

the engine is setup on an engine dyno, and i have a wideband O2 sensor hooked up. i cant really put load on it cause i cant get it to rev yet since the tables are blank. where should i start, what should i do?

i was thinking about slowly reving and seeing how it reacts and adjusting the fuel mixture (only filling in a shallow diagonal on the table), but then if i floor the engine, it wil probably keel.

how would i start putting in values at just say 100% at 0rpm to get started on the dyno? is there some sort of correlation on the tables?

thanks

 

the engine is setup on an engine dyno, and i have a wideband O2 sensor hooked up. i cant really put load on it cause i cant get it to rev yet since the tables are blank. where should i start, what should i do?

i was thinking about slowly reving and seeing how it reacts and adjusting the fuel mixture (only filling in a shallow diagonal on the table), but then if i floor the engine, it wil probably keel.

how would i start putting in values at just say 100% at 0rpm to get started on the dyno? is there some sort of correlation on the tables?

thanks

 

You need to start with some sort of basemap. Fill in the map based on an educated guess (look at other similar maps). From there, you start to give it a little gas and adjust.. you'll be able to detect the trend of the fuel curve as you go on and be able to change the map before you even get to that part of it. Be very careful-- if your afr goes lean, instantly let go of the throttle and richen it up.