Originally Posted by AMGLover
I remember that Renntech had two pulley kits for the R170. The first does not require "ecu update" because it run low boost and the second stage require "ecu update" to correct the drivability issues and A/F ratio. I would call renntech to find out which one you have.
Incorrect. RENNtech has only ever sold one Pulley kit. It used to be that you could purchase the pulleys separately from the ECU upgrade but they were the same pulleys.
There is no "low boost" vs. "high boost" pulley kit.
If you guys feel that you are running more boost than the ~ 3 psi number I threw out one of us is wrong with their figures and I am perfectly willing to accept that I quoted the wrong value in PSI increase.