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Post Info TOPIC: 2 step fueling


Member

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Date:
2 step fueling


I have a little concern over the fueling during the 2 step operation. I am running the ECU editor on an 08 b-king. The ECU is flashed as a Hayabusa w/. b-king gauges. My question is during 2 step operation the A/F is 20+ I do not leave it there at all, but I was wondering if there is a way to add fuel while the clutch is in, or in neutral. If this is posted somewhere else, sorry. 

Little information. 

The bike is a 1407cc, low comp JE piston Turbo biek running on E-85 with a 1:1 pressure regulator. I am running RCC injectors and fuel rail. The bikes fueling seems to be great otherwise. 12.8 A/F under load making 380hp at 17psi. (245hp at 8psi)

I have turned up the fuel pressure manually and the 2 step works awesome and helps build boost, but then it is rich everywhere else. I have thought about addig fuel in the TPS map at 100% throttle and 6000 rpm, but then it is really rich when I ride normal and accelerate. The 2 step is set at 6,000rpm

I was also considering having the MS map set up for clutch in for the 2 step.

Anyone else having any issues?

Thanks for your input and Time.



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Guru

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Date:

You will not get an accurate a/f on 2 step, every cut spark introduces unburnt oxygen

use the MS fuel map and tps n ign map ,tie in the clutch switch to trigger it and you can pull timing and add fuel as desired

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Guru

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Oh and one thing to be aware of, the secondary injectors do not come on with clutch in , so you may need to add more fuel than you think if your getting good positive boost on 2 step

logging primary and secondary dc with a external logger will help see exactly how its working

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Member

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I had figured that the A/F would not read correctly, but there is an obvious difference if I add fuel pressure to it. I was looking at the Clutch in and Neutral ignition map and there is some serious timing in neutral in the middle of the map. 73 degrees? seriously? I am thinking of changing the timing maps so they more closely relate to each other because in neutral and clutch in there is an obvious change in response and smoothness.

Thanks Guru for your quick response. I will try to take out some timing and add a bunch of fuel to the map and see what happens.


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Guru

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Posts: 546
Date:

Pretty sure those big timing numbers are in areas you can't reach in normal operation, gsxr has real big numbers ,
maybe get to them on overrun slightly trailing the throttle and i expect threre part of the anti pollution to try and get a complete burn of fuel in the cyl in that situation

If your logging you will be able to target the areas of the table in use ,


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Veteran Member

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What % of fuel are you adding to make boost? How much timing are you pulling to get good spool after burn?

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Home Built 06 Gsx-r 750 w/ Disco Potato .60 A/r 6.5lbs Pump gas 100% stock motor 211.54 rwhp...... going for 275 on E85 with ECU editor

Oh make it 237rwhp and 97lbs on E-85 100% stock motor 8lbs of boost. Thanks WIN Racing

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