Originally Posted by jtuds
Originally Posted by Alan l.
^^ what is the expected HP increase with the PPK? In the past the gains are only up to 335is specs which is only 320hp.
Turner is willing to do $1500 for the Hartge tune when i emailed them. Still a lot of money for a piggyback system but looks like the only option at this point.
You can NOT compare JB to Hartge. Hartge is in a completely different league as a Bmw tuner in Europe
What impact do these piggyback tunes have on fuel efficiency and the different drive modes?
In my experience, fuel economy is unchanged. Although, having the tune makes it much more tempting to be more aggressive with the throttle, which in turn will decrease fuel economy.