Stage 1v2 VS Stage 1v4
 

What are the differences anyways?

V2 had only changes to the fuel curve.

"In the Stage One code we retained the shape of the Subaru fuel map while moving the entire fuel curve down to a focus around 12.9 to 1." www.ecutune.com

But V4 had changes to the fuel and timing curves.

"Starting in Stage I v4 performance was further increased by adding ignition advance to a table used in conjunction with the dual knock sensors to actively seek the borderline of knock."
www.ecutune.com

I had V2 and then went to V4. I felt a diffence, but it was not as much as going from OEM to V2. I would say that V4 on the first day felt like V2 with a week of learn time.

Whats the difference from v3 to v4?




dustin

I think it was a fix to the 87 octane code.