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Discussion Starter · #1 ·
I was wondering how muhc I ould increase the igniton timing without risking putting a hole in a piston. I was thinkign 3 degrees using 92 octane fuel. I know DOc has his R6 advanced 3 degrees. I'm only gonig ot mess with the map over 7k RPM @ voer 60% throttle. I was also going to retard the ignition 1 degess under 20% throttle ot see if it will smooth out the on/off throttle transitions. I always hear than SBK teams back off the ignition in the rain for smoother power delivery.

Any suggestions???
 

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I've been asking a LOT of questions regarding tuning the PCIIIr for the Busa. I haven't messed with the timing yet. So far what I've been able to gather is to get the fuel curve down first.

I've done a little experimenting but am pretty uncomfortable messing around with the turbo without some kind of A/F indication. I'm considering adding an O2 sensor and A/F gauge to give me some feedback while I'm driving.

The difficulty with advancing the timing is the absence of a knock sensor. I wouldn't think that retarding the timing a bit to smooth the response would be a problem. How will you determine when you have 3 degrees advance? I don't think the PCIIIr table entires are in degrees. I think they are arbitrary values.

I'm by far no expert engine tuner. I am doing a fair amount of reading and trying to learn. My main goals are smooth power delivery and not melting down the motor under boost.

At the moment I'm considering a heated O2 sensor with the AutoMeter A/F gauge. I'm giving some thought to a wideband sensor. However, those require a special meter or a voltage adapter. O2 sensors are 0-1 volts while wideband are 0-5 volts. These devices are not linear so I'm not sure about the conversion. The question is whether the meters are linear or attempt to correct for the nonlinearity in the sensor. Since most discussions indicate the meters are more accurate in the stochimetric (sp?) range, where the sensors are most accurate, I would assume that the meters are linear. Therefore the voltage conversion should be easy.
 

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I can make my bike lean!
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cherrypicker said:

Any suggestions???
Buy a bigger bike!

With all that tinkering to get 1% more power (if youre lucky) that you may or may not notice doesnt seem to be really worth it to me. My crystal ball sees a 954 in your future!;)
 

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Mike- I have it advanced +4. Good luck messing w/ your new toy!


Doc
 

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YO MAMA
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ill still whip the floor with you..power, and twistys:laughing

have fun.

p.s. try not to short EVERYTHING out while working on it.:rofl
 

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turbospeedIII said:
dave try this he will sell on with a heated air fuel gage it is what i have and it works great

http://www.dawesdevices.com/
Interesting... he reduces the number of LEDs but puts them closer to the range you want to operate. However, he doesn't seem to indicate the ratios these voltages relate to. I'll take a look at the curves for some sensors to get an idea.

Also, this appears to be for narrow-band sensors, whose accuracy in the 12.0-12.5 range is questionable, especially as they age.

Thanks for the info. I'm still thinking about it but will probably do something if for no other reason than comfort. It will give at least SOME indication of what's going on fuel-wise.
 

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you are correct if you are doing your own tuning you need to know where you are!!!!

cherrypicker
i would advance it 4-5 deg below 6000 rpm's(that will make it snappyer) and 3 deg above that. and ride it to see how you like it and then move only a little bit at a time
anyting more that 5 deg you are playing with fire
 

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Odysseys said:
ill still whip the floor with you..power, and twistys:laughing

have fun.

p.s. try not to short EVERYTHING out while working on it.:rofl
:evil :evil BTW, whats the word on the electrics?
 

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Discussion Starter · #10 ·
Re: Re: PCIIIr ignition map question

YZFRabbit said:


Buy a bigger bike!

With all that tinkering to get 1% more power (if youre lucky) that you may or may not notice doesnt seem to be really worth it to me. My crystal ball sees a 954 in your future!;)
My crystal ball see's you giving me $3000 to pay off my current bike so I can get a loan for a new one.:twofinger


It's not just about the power. Getting it tuned right really makes it smoother and more controllable.

Dave, I'm pretty sure the ingintion map values are in degrees, but I check the manual. I think they limit you to +/- 9 degrees.
 
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