[OldBaldy]

DOH! Damn the wife for switching me to decaf! 13:1 (13 parts air, 1 part fuel) is rich! I've got to stop posting when i'm tired.

I was waiting for someone to say something

Back to the original question, no, you don't HAVE to dyno to map a PCIII - it's just easier and quicker. You can build a perfectly good map yourself, with any decent Wide-band O2 sensor and data logger setup. The advantage is that you can change it as you see fit, and continue to optimize the fuel map as you ride and also as you make any other tuning changes, without paying any more $$$ for updated dyno maps.

 

[OldBaldy]

ok, is this true?


Dynojet PC III Cons:

The power commander actually gets in between the sensors and the ecm. The power commander requires the user to input different values to ecm so it can create a different map than normal. This is all done on a fourth gear roll on with a dyno in conjunction with thier software and they achieve good results, in fourth gear. Power commander technology is rpm based. Techlusion technology is load based. My question to you is: Do you think that your bike requires the same amount of fuel in fourth as it does in second?
Any one used techlusion TFI ??
http://www.totalfuel.net/dynojetpwcIII.htm

This is incorrect. The PCIII interrupts the OUTPUT signal from the ECU to the injectors, and modifies the injector dwell based on the PCIII offset map, by adding or subtracting fuel (in percentage terms) from that calculated by the ECU from the stock sensors. There is no manipulation of input sensor value (as far as I know) from the various inputs - RPM, timing, TPS, air pressure, air temp and coolant temp.

The question - does the engine require the same fuel for 2nd gear vs 4th gear - well...the correct answer is really Yes and No! Yes because the engine couldn't care less WHAT gear it's in, and if the engine is held at a steady RPM and steady TPS position, the fuel requirement will be identical, regardless of the gear the motor is in, but NO because there is a need to richen the mixture under certain acceleration conditions - and for all practical purposes, any bike will accelerate faster in 2nd gear than in 4th gear, due to the torque multiplication of the lower gear (higher gear ratio).

BUT, the PCIII also has the optional, free download module to simulate an "accelerator pump" which allows some extra manipulation for this requirement.

The PCIII is the more sophistaced device of the two, IMO.