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can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Thu Jan 17, 2019 5:32 am
by Windsma
I read some noticed a voltage drop when flashing the pcm. Closest power supply i have is 16v 4amp.
Will the 0411 pcm take 16.3v?
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Thu Jan 17, 2019 11:00 am
by VX L67 Getrag
I'm pretty sure I remember Antus saying when testing it will only fail if it get's below 12v, but I personally wouldn't be using anything more than 14.5v & usually only needs less than 1amp!
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Thu Jan 17, 2019 12:21 pm
by antus
Car stuff is usually industrial quality and has quite high tolerances. I would think it probably would be ok, but no gauruntees and you probably should find a lower voltage unit. I tend to use cb radio power supplies as they are often 13.8v because they are designed to power a device that also works in a car.
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Fri Jan 18, 2019 5:58 am
by Windsma
Being an impatient person..
My Allpro showed up today and thought I would see what happens., given the pcm is still under junkyard "warranty"
Two 14min read sessions and one 3min write, nothing got warm worked like a champ.
I will still order a resistor to throw in line and drop it ~2v
I assumed the amps were fine given most PCM fuses are 20amp
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Fri Jan 18, 2019 6:42 am
by pman92
Putting a resistor in-line is going to drop the voltage dependent on how much current the PCM is using.
If the PCM current draw changes the voltage drop will change and the PCM supply voltage will be unstable
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Fri Jan 18, 2019 11:33 am
by Holden202T
just get a voltage reg ?
a good test would be, get a logging session going with the pcm and see what voltage its seeing ? it might have internal circuits to stop over voltage ?
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Sat Jan 19, 2019 2:22 am
by Windsma
Pcm saw 16.8v during flash according to pcmhammer
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Thu Jan 24, 2019 12:28 am
by j_ds_au
pman92 wrote:Putting a resistor in-line is going to drop the voltage dependent on how much current the PCM is using.
If the PCM current draw changes the voltage drop will change and the PCM supply voltage will be unstable
Yeah, some series diodes, say 3-4x 1N4007, would be better. Or bigger diodes should the current exceed 0.5A (unlikely).
Joe.
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Sun Feb 03, 2019 12:49 pm
by NSFW
My 411 draws about 350ma almost all of the time, but when flashing it draws more. I don't recall for sure how much, but I think it was 600-700ma.
Re: can the 0411 P01 take 16.3v? Benchtop flash rig
Posted: Sun Feb 03, 2019 11:09 pm
by j_ds_au
NSFW wrote:My 411 draws about 350ma almost all of the time, but when flashing it draws more. I don't recall for sure how much, but I think it was 600-700ma.
Hmmm, that's a big jump in current. That should still be OK for short periods though, as the 1N4007 has a maximum rating of 1A.
Joe.