I have an AEM EMS V2 and i also have an aftermarket 4.56 diff waiting to be fitted. Do you need to use one of those yellow box things or is there a setting in the AEM EMS that will allow you to change the speedo calibration?

I imagine its not a question thats asked often but seems like one of those settings thats most likely hidden away somewhere.

Thanks

 

Found this in the full list options so will have a tinker with it and see what difference it makes

 

Have any good results? I'm having my car tuned in a few days and would like to see this done....

 

I had to fit a speedo box so that i could calibrate it correctly. I think adjusting it in the EMS wont adjust what the speedo see's so you have to get done via a speedo adjuster. I think i got a plug and play one in the end.