10 % Ethonal

[GLIDEMAN]

Is 91 or 93 octane with 10% ethonal instaed of only gasoline a problem when running a dry nitrous system (40 shot)?

[chevelle]

I didn't have any trouble with the busa.....i did with the ZX12.

[NOMRLZ]

I didn't have any trouble with the busa.....i did with the ZX12.

fukkin 12   

[chevelle]

I pulled 1 degree out on the busa,just to be safe.

Not nitrous related,but the busa seems lean at faster cruise speeds. Have been getting throttle hand numbness.
I just bumped the fuel up from 3500-5250 in the lower (0,2,5,10) % throttle settings. Will find out in a few minutes if it helps. 

[PetriK]

I pulled 1 degree out on the busa,just to be safe.

Not nitrous related,but the busa seems lean at faster cruise speeds. Have been getting throttle hand numbness.
I just bumped the fuel up from 3500-5250 in the lower (0,2,5,10) % throttle settings. Will find out in a few minutes if it helps. 

Just out of curiosity - did you manage to get satisfactory results ?

Busa is using so called VACUUM MAPS when TPS < 10%. That meanst that for TPS is not used for fuel, instead the signal from vacuum sensor determines amount of fuel to be delivered. That means that if you tune for e.g. 5% the vacuum may be 0.1 or 0.6, and there is different amount of fuel for vacuum 0.1 and vacuum 0.6 meaning that putting a certain amount of fuel for 5% can not usually guarantee that its optimum for all vacuum positions.

When using the ability to reflash the ECU we usually get very good results as we tune the vacuum maps directly for TPS<10% and then of course everything is optimized.

[chevelle]

Yes
I have a map switch on the bike. At cruise both maps were the same. I fattened up the motor map (would have to check it,but 5-7 % as i recall) there was a marked  improvement with the richer map. Still has the 4700/4800 buzz,just not as bad.

[glenn71]

if you free rev the motor and note the air fuel at say 3000 and 1-2% throttle position is say 12:1.If you then ride it with a dynojet lcd display showing throttle percentage that same 1-2% throttle percentage at 3000 can read 15:1 under riding load.I know one is in nuetral and one isn,t but thats still a big differnce so something is altering air fuel as the throttle position was the same.

[PetriK]

if you free rev the motor and note the air fuel at say 3000 and 1-2% throttle position is say 12:1.If you then ride it with a dynojet lcd display showing throttle percentage that same 1-2% throttle percentage at 3000 can read 15:1 under riding load.I know one is in nuetral and one isn,t but thats still a big differnce so something is altering air fuel as the throttle position was the same.

Yes, for 0-10% throttle positions fuelling is load (i.e. vacuum) based so that amount of variation is normal.