Carpokes Porsche Forum

Wow, that's fantastic. @whalenlg is doing something similar for the DME.

Would be cool to integrate them if feasible.

@andyb - do you have a klr schematic?

I could probably create one based on the pics on the website, but always easier to reuse what’s out there.

Hi @whalenlg

Would be cool to integrate them if feasible.

Yeah. It'd be great to have a reasonable physics sim of the engine + DME and KLR simulation ultimately. I need to focus on getting the basics of the KLR working first though. I'm currently trying to figure how to simulate the ADC. I think that will occupy me for a few days yet.

do you have a klr schematic?

Sorry, no. I've just been using the info from John's KLR pages so far, and occasionally looking at my PCB photos.

I have a spare KLR that I use for this stuff, so if photos would be useful let me know. I only ever did enough to understand how things work, so the drawings on my site don't have component values because I didn't really care about that. I just needed to know the basic op amp configurations, and what's logically connected to what etc.

I have spare KLRs is you want to borrow one...

andyb wrote: Thu Feb 05, 2026 1:55 pm Hi @whalenlg

Would be cool to integrate them if feasible.

Yeah. It'd be great to have a reasonable physics sim of the engine + DME and KLR simulation ultimately. I need to focus on getting the basics of the KLR working first though. I'm currently trying to figure how to simulate the ADC. I think that will occupy me for a few days yet.

do you have a klr schematic?

Sorry, no. I've just been using the info from John's KLR pages so far, and occasionally looking at my PCB photos.

I did a simple ADC Verilog model - 3 address bits to select which of 8 values go in, 8 data bits, 8 clock cycle latency from address change to output valid

Tom wrote: Thu Feb 05, 2026 2:37 pm I have spare KLRs is you want to borrow one...

If that was addressed to me, that is a very kind offer. But I don't really need one. I've currently got the one from my car on my desk. What I really need to do is to put it back in the car, without its metal box and probe it with a 'scope like John has done. But that would involve getting cold and damp at the moment.

andyb wrote: Sat Feb 07, 2026 2:16 pm

Tom wrote: Thu Feb 05, 2026 2:37 pm I have spare KLRs is you want to borrow one...

If that was addressed to me, that is a very kind offer. But I don't really need one. I've currently got the one from my car on my desk. What I really need to do is to put it back in the car, without its metal box and probe it with a 'scope like John has done. But that would involve getting cold and damp at the moment.

Well, I'm open to helping all if I can, but that was honestly directed to whalenlg since he lives down the road from me

I've implemented almost everything I can think of, but the code still doesn't seem to run correctly. I suspect the values my simulated ADC generates aren't good enough. What I've done:

Chan 0 (knock sensor noise): returns 0
Chan 1 (battery voltage): returns 200
Chan 2 (unknown): returns 0
Chan 3 (TPS supply voltage): returns 40 (I have no idea what a good number would be)
Chan 4 (MAP): returns 0 for full vacuum, 255 for 2 bar
Chan 5 (Knock sensor integrator): returns 0
Chan 6 (unknown): returns 0
Chan 7 (TPS potentiometer output): returns 0 for closed throttle and 255 for wide-open throttle

Can anyone suggest any improvements?

The code does seem to read from channel 2 and 6. I traced where channel 6 goes on my board, and it looks like it goes to ground through a 6 kOhm resistor.

Tom wrote: Sat Feb 07, 2026 2:25 pm Well, I'm open to helping all if I can, but that was honestly directed to whalenlg since he lives down the road from me

That makes sense. The risk of posting rare hardware across country borders would make me nervous.