Quote:
Originally Posted by dcb
I would suggest the following setup values for vw/audi(rest at default). Must get through all items to store.
VSS Pulses/Mile=13406
MicroSec/Gallon=0128800000
InjTrg 0-Dn 1-Up=1
FYI, the signal rmccomiskie and yetimus describe sounds like a wire from the ECU that should incroproate all the fuel variables into a basic duty cycle representation of fuel consumption for an onboard mpg gauge, that never gets installed in the states. |
I just noticed this thread. VSS=13406 is dead on for my Audi. My speedometer has "K=6703" on the face of the speedo gauge. That's the number of pulses per mile. I doubled that to get 13406 since the MPGuino counts both rising and falling edges of each pulse.
Check the bottom front of your speedo face. See if it has "K=????". It could be hidden by the instrument bezel so poke around.
MicroSec/Gallon is most likely very different for your TDI. In order to get "in the ballpark", here's what I did:
1. From experience I know that I get about 21 MPG at 75 mph on level ground.
2. Calculate GPH: 75 mph/21 mpg = 3.57 GPH.
3. Set uSec/Gal to some number. I suppose 128800000 is as good as any.
4. Go for a drive at 75 MPH on level ground and watch the GPH reading on the MPGuino. If it's greater than 3.57 then increase the uSec/Gal number. If it's less, decrease the number.
The idea is to get close to the correct GPH at a speed where you know the MPG that you should be getting.