VT PCM & Jimstim Crank 18x 3x

[The1]

Anyone done this, i see the jimstim doesn't have 18x but there is source code and a program to write up to the cpu.

The wheel pattern upgrade is at the bottom of this page.
http://jbperf.com/JimStim/JimStim_v2_0_ ... html#Wheel Pattern Upgrade

[The1]

ok so you can program in wheel patterns, here's the default file
http://jbperf.com/JimStim/wheels_default.jsw

So it's a 18x 3x? So it will need 18 pulses then 3 cam pulses? When would work fine over a certain rpm. Just need to figure out how to write the code in and then upload it, not sure what delay factor would be, it could be measured with a scope..

//format of wheel pattern is
//output byte, delay factor (angular or time)

[VL400]

The pulses are timed like this .. https://pcmhacking.net/forums/view ... t=10#p2103

Will need to go through and work out in degrees when each transition occurs. There is also a cam signal so the PCM can sync to cyl #1, not sure when the transitions of this occurs in relation to the 18x and 3x though.

[The1]

thanks!

it says there that it only needs the 3 cam pulses at the start, then it runs using a divide by 6 routine, im guessing they mean rise and fall by delay factor (angular or time) which looks to be 10deg.

So code "might" look like. Just need to figure out how to upload now.

10,10, // cam trigger
10,10, // cam trigger
10,10, // cam trigger
00,10,
01,10, //1
00,10,
01,10, //2
00,10,
01,10, //3
00,10,
01,10, //4
00,10,
01,10, //5
00,10,
01,10, //6
00,10,
01,10, //7
00,10,
01,10, //8
00,10,
01,10, //9
00,10,
01,10, //10
00,10,
01,10, //11
00,10,
01,10, //12
00,10,
01,10, //13
00,10,
01,10, //14
00,10,
01,10, //15
00,10,
01,10, //16
00,10,
01,10, //17
00,10,
01,10, //18
0xff // terminating string

[VL400]

Are you wanting to trigger an ign module or just the PCM? Your really going to need 3 signals if you want to simulate either exactly - the 18x, reference and cam to trigger the PCM or 18x, 3x and cam to trigger a ign module.

The three 18x pulses at the start are so the module can work out where the engine is - it looks at the transitions between the 3x slots (all different widths). The PCM does not care about that.

[The1]

trigger the PCM into EST

[VL400]

So you only need 18x, cam and a ref signal Cam signal is for the sequential fuelling and should happen once per cycle (just not sure when exactly) and the 18x for cranking. One thing to be aware of is you will get a code 41/42 unless you can ground (through a low ohm resistor) the EST pulses while the bypass line is 0v.

[The1]

thanks VL, am trying to get upload working, will see how i go