94 Firebird 3.4L OBD1 swap

[Firehawk94]

Ok will do. About the valvebody swap, that sounds like a good route to go and I have experience with valvebodies which means it would be an easy feat for me to accomplish, but I wouldnt want to dive into this without more information.

[IsaacHayes]

Hmm amperage eh? PWM can control amperage, but so can other ways... Someone with electronics knowledge could whip up something that reads a 2nd MAP and varies the current based on load... You could even put a potentiometer on there to chang the bias incase you wanted more firmer or softer pressures per load.. Wouldn't be that hard to do I would think... Unless the MAP is not really linear... But that could be overcome as well but would require a bit more knowledge of electronics. Maybe a PIC IC would be good here...

[robertisaar]

MAP is very linear.

(.369*N)+10.354 = kPa

that's the equation i use in all of my ADS, XDF and ADX.

essentially, except for the 10.354 offset, it's perfectly linear.

i had a chart somewhere that gave voltages vs kPa readings... oh well, takes two minutes to make.

EDIT: for this situation, this should work:

kPa____Voltage___A/D Counts
15______.25__________13
20______.51__________26
25______.78__________40
30______1.04_________53
35______1.31_________67
40______1.57_________80
45______1.84_________94
50______2.10_________107
55______2.37_________121
60______2.65_________135
65______2.90_________148
70______3.18_________162
75______3.43_________175
80______3.70_________189
85______3.96_________202
90______4.23_________216
95______4.49_________229
100_____4.76_________243

[IsaacHayes]

Hmm. I bet you could make a quick and dirty circuit with a voltage regulator running in current regulation mode, controlled by a 2nd MAP that was running off 5v (possibly from another voltage reg). If we knew how much current the force motor needs, that could be devised....

[robertisaar]

Hmm. I bet you could make a quick and dirty circuit with a voltage regulator running in current regulation mode, controlled by a 2nd MAP that was running off 5v (possibly from another voltage reg). If we knew how much current the force motor needs, that could be devised....

the highest you can read according to the datastream is 5 amps...

56 CURRENT FORCE MOTOR COMMAND CURRENT
AMPS = N/51
57 CURRACT FORCE MOTOR ACTUAL CURRENT
AMPS = N/51