TPS and CDI Fuel Maps


2 replies to this topic
  • MPHorvat

Posted August 26, 2008 - 06:31 AM

#1

I've done the searches on TPS, and read through the manual. On an 05 450F, how many different fuel maps are there specifically for throttle position?

I've read that there are 6 different maps from which one is selected based on the combined inputs of both throttle position and engine RPM. I started thinking that if hypothetically there were 3 options for each, i.e. throttle low, medium and high, and engine speed low, medium, and high, there'd be 9 different combinations. Too many, if 6 is right.

Another hypothetical guess: 2 options for throttle position (low, high) and 3 options for engine speed (low, medium, and high), which would yield 6 options.

Any info on this?

TIA, Mark

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  • William1

Posted August 26, 2008 - 06:44 AM

#2

My own uniformed take is there are two, perhaps three. And not a fuel mapping rather it is ignition curve advance. Try this. Unplug the TPS, put the CDI in default mode. Notice much of a difference?

  • MPHorvat

Posted August 26, 2008 - 08:13 AM

#3

And not a fuel mapping rather it is ignition curve advance. Try this. Unplug the TPS, put the CDI in default mode. Notice much of a difference?


Yup, I misspoke re. fuel curves, should be timing modifications.

"CD in 'Default Mode'?" Unplugging will remove power to the sensor. If the input in the CDI has a "pull-up resistor" the input to the CDI will be left high, which would emulate the throttle being fully twisted open (ref. schematic). Can anyone confirm a high (5VDC) reading on the input to the CDI with the TPS sensor removed? Having typed that, I suppose it would be fairly easy to confirm: start the bike, unpug the sensor read the CDI side of the plug.

I'm not confident in my abilities to notice a mild change, only having the bike for a short time.

Mark




 
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