DIY Charging Supply PSU for ISTA+ BMW Programming

[fmorelli]

Good feedback. Unfortunately amperage requirements are higher on the later cars.

We are using a trim resistor so I can play with current setting. I've read there are some workarounds to increase current ceiling?

I'll report back after more testing.

 

[mc-3]

Hi guys, fantastic job! you inspired me and I just ordered the Dell 1570 to do this. I'm coding on my BMW motorcycle, so maybe overkill, but rather do that than fall short.
One minor question is the 91ohm resistor. Do I really need it or can I get away with a simple connector?

 

[fmorelli]

@NoQuarter any feedback on the 91Ω resistor? I am running my setup and that's what we have there.

It works generally fine. I'm not holding voltage quite as high as I'd like, but it's high enough that ISTA+ seems happy. I've used it several times on my E70 X5 without issue.

 

[NoQuarter]

That resistor is required in order to get the voltage to adjust higher.

And... it needs to be an adjustable trim resistor so it can be set to a more precise value that works for the specific psu..

I can't get my voltage as high as I prefer either without it going into safe mode and shutting down. One last thing I thought to try was to use a really low range trim resistor so there would be wide range of adjustment around that 91 ohm value.

 

[Heffstar]

Reviving an old thread. This looks amazing. What ever happened to it? I could seriously buy this lol.

 

[larsony99]

I am here referencing this thread in 2024, and not an electrical engineer. What did everyone find out regarding the resistors and voltage and overcurrent protection?