Hey all,

I've been going through the SIMOS FR (much appreciate nyet) and bin file, and it seems to me there is a hard limit of 1389mg/stk in the software.  Which is around 550 crank tq.  The Aircharge to Torque map is one of many examples.

From best I can tell, SIMOS 8.4/8.5 are largely based on earlier SIMOS versions for the Audi 3.2fsi which used a MAF primarily, and speed density for transient calculations as many OEMs do.  I think the 1389mg/stk was a limitation of MAF readings, you can google the number and other platforms have an identical limit.

But when Audi moved completely to speed density, they kept this limit.  The MAP side seems fine with physical limits of 5434 hPa.  But the speed density calculation seems like it has a physical limit defined at 1389 mg/stk

If Torque was limited, it would be less of an issue since Torque isn't measure directly but DEFINED by airmass.  Airmass however is calculated directly off of MAP sensors.

This limit probably won't be hit with the tvs1320, but I want to go big turbo this summer if possible.  

Am I missing something?  This is the first ECU i've ever looked at.  

Shit.  And since we don't have fueling tables but calculated fueling from target lambda and airmass, our fueling now needs to be scaled in the inverse of airmass scaling, right?  

What new ECUs double this limit?  Simos 16?  I see the 3.0T EVO uses that ECU, would swapping to that ECU likely be an easier thing to pull off ?  That would also come with the added benefit of port injection.

I assumed we would need to edit the underlying speed density equations and everything it references. 

Which logging tool do you use that displays all of this?

I was going to try rescaling, but then realized fuel pressure is also limited at 174 BAR.   I think I might try rescaling both over winter.