CAJ Innovations Forums - Raw serial parsing, second problem

raz

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Re: Raw serial parsing, second problem
Reply #15 - 10/22/09 at 05:22:09

jocke wrote on 10/21/09 at 22:32:34:

I have been running my 130hp monster on single injectors more then 2 years. Rev limit is 10500 and it runs out of fuel just above 8000RPM. Above that it is 100% duty cycle so it is not a perfect situation and I am loosing a bit of power there.

I advanced the inlet cams about 15 degrees to move down the powerband a bit to "detune" the engine and gain more midrange.

The bike is however still running good and I have not had any issuse due to this. No reliability problems. After all the time that I am on 100% duty cycle is just a second or two during full power acceleration.

I am not sure if I am going to increase the fuel pressure or go to double injectors to sort this. I have some new camshafts to install this winter and I estimate that I will need about 20% more fuel to be on the good side.

Going up from 3 bars to 4,5 bars will sort this as it will give about 22% more fuel. My main concern is pump reliability with 4,5 bar fuel pressure.

Jocke...........

Sounds like the actual result is continuos squirting. So it's still willing to rev up to the limiter? How lean does it get?

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jocke

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Re: Raw serial parsing, second problem
Reply #16 - 10/22/09 at 16:42:11

She is very willing and able. Smooth response, killer mid/top range. 3:d gear power wheelies above 6500RPM.

If it was not for the fact that I know that she needs more fuel I would not be able to say that she needs more fuel by the feeling of how she is runing.

I think that if I had 10-12% more fuel it would be okay for the moment and with the new camshafts and modified camtimimg I think that 4,5 bars pressure (+22,5% fuel) will be perfect.

As you might have guessed blue graf is after engine upgrades and red is before

Jocke..........

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raz

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Re: Raw serial parsing, second problem
Reply #17 - 10/24/09 at 05:09:46

Jocke, if you were using my Logworks plugin, which would you prefer? I can't decide.

1. A reported duty cycle of 100% means the actual pulse, including deadtime, equals all time available. This way it will never exceed 100% however stupid we map it. A value of 99% should be considered unknown territory because we really don't know how the injector will behave at an off-time shorter than deadtime.

2. A reported duty cycle of 100% means the effective pulse, excluding deadtime, equals all time available. This way the reported value may exceed 100% if we're really pushing it. On the other hand, any value below 100% should behave as expected.

Currently I report it as #2 but I'm very ambivalent.

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Re: Raw serial parsing, second problem
Reply #18 - 10/24/09 at 17:29:04

raz wrote on 10/24/09 at 05:09:46:

Jocke, if you were using my Logworks plugin, which would you prefer? I can't decide.

1. A reported duty cycle of 100% means the actual pulse, including deadtime, equals all time available. This way it will never exceed 100% however stupid we map it. A value of 99% should be considered unknown territory because we really don't know how the injector will behave at an off-time shorter than deadtime.

2. A reported duty cycle of 100% means the effective pulse, excluding deadtime, equals all time available. This way the reported value may exceed 100% if we're really pushing it. On the other hand, any value below 100% should behave as expected.

Currently I report it as #2 but I'm very ambivalent.

I have never been thinking about it but I would guess that the # 2 is the one I am used to. #1 will have some advantages but it what about if you change to different injectors that behaves differently? I will not be correct then.

I dont think it is a bit problem anyway as long as you know how it works.

I vote for #2

Jocke........

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raz

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Re: Raw serial parsing, second problem
Reply #19 - 10/24/09 at 19:56:35

jocke wrote on 10/24/09 at 17:29:04:

I have never been thinking about it but I would guess that the # 2 is the one I am used to. #1 will have some advantages but it what about if you change to different injectors that behaves differently? I will not be correct then.

I dont think it is a bit problem anyway as long as you know how it works.

I vote for #2

Hm, I screwed that up. This is the correct descriptions of course:

1. A reported duty cycle of 100% means the actual pulse, including deadtime, equals all time available. Any value below 100% should behave as expected.

2. A reported duty cycle of 100% means the effective pulse, excluding deadtime, equals all time available. A value approaching 100% should be considered unknown territory because we really don't know how the injector will behave at an off-time shorter than deadtime.

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