DIY tuning

[JPuehl]

Just thought I'd share another test log. 7.1# of boost to 27.7# in 700 rpm. The PS750 is certainly not slow to spool.

20240307 - test - 1

www.spoolstreet.com

 

[Asmo]

0x1C35C2, 2 bytes lsb, conversion: X*0.078125, PVDMX : Obere Druck Schwelle für Range Check

3000 HPA of absolute pressure is about 29ish psi of boost depending on the barometric pressure.

 

[wheela]

0x1C35C2, 2 bytes lsb, conversion: X*0.078125, PVDMX : Obere Druck Schwelle für Range Check

View attachment 92037


3000 HPA of absolute pressure is about 29ish psi of boost depending on the barometric pressure.

Nice. So are these soft limits for the tmap? So potentially the 3000 value would need to be increased?

Interesting that 500 is about 7.5psi, which would make sense for a lower limit if it's absolute pressure, as atmospheric would never conceivably be that low. But if it's absolute, then wouldn't 29-ish psi translate to a 15-ish psi boost limit? Or maybe they aren't both absolute?

Sorry, I'm probably mis-understanding something. Not the first time and definately won't be the last, lol.

 

[Asmo]

Nice. So are these soft limits for the tmap? So potentially the 3000 value would need to be increased?

Interesting that 500 is about 7.5psi, which would make sense for a lower limit if it's absolute pressure, as atmospheric would never conceivably be that low. But if it's absolute, then wouldn't 29-ish psi translate to a 15-ish psi boost limit? Or maybe they aren't both absolute?

Sorry, I'm probably mis-understanding something. Not the first time and definately won't be the last, lol.

3000 hpa = 300 kpa = 3bar = 43.50~ psi absolute. - baro = 29ish psig

500 hpa is 0.5 bar absolute so bellow anything you will meet on earth unless you drive on MT Everest.

Yes the 3000 value should be increased. "Obere Druck Schwelle für Range Check" translates to "Upper pressure threshold for range check".

I haven't looked at the routines thoroughly, as to what else it may affect, so increase with caution.

 

[wheela]

3000 hpa = 300 kpa = 3bar = 43.50~ psi absolute. - baro = 29ish psig

500 hpa is 0.5 bar absolute so bellow anything you will meet on earth unless you drive on MT Everest.

Yes the 3000 value should be increased. "Obere Druck Schwelle für Range Check" translates to "Upper pressure threshold for range check".

I haven't looked at the routines thoroughly, as to what else it may affect, so increase with caution.

Gotcha! I didn't realize you already subtracted atmospheric from the converted 3000 hPa value, and didn't convert it myself to see the 43.5 value - makes sense to me now Thanks!!

 

[JPuehl]

Yesterday I was finally able to get a log showing more than 28.5# boost without the DME freaking out thanks to the efforts of a bunch of people, @Asmo, Chris @Stokes , Houtan @houtan and some guidance from Jake from MHD (not from State Farm). It only took the change to the one table mentioned above. My next obstacle is traction, thanks to living in the PNW/Washington. Just need to be patient and advantage of any slightly warm dry day until this Summer.

 

[houtan]

i second that!

Thanks to @Jake@MHD, @Asmo, @Anon1, @JPuehl, @Stokes, for working on this.

Double thanks to @Asmo for the xdf language. here it is:

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[fstbtstr]

The boost error is calculated as "boost target-Boost measured in chargepipe". Pldr_soll being boost target and Pvdkds boost actual in chargepipe.
View attachment 61994
View attachment 61996

This is a very interesting diagram, is that from some N55 FR or is that from some N54 boost logic document circulating around?