Well we have yet to see a Hartge dyno for am F10
Originally Posted by Alan L.
Compared to the JB4?
While I do say you get a lot of bang for your buck with the JB we aren't getting anywhere near the gains they claim on their website. From two dynos I've seen it's about 20-30whp and 50-60wtq and these were cars running catless downpipes.
Hartge's numbers appear to be at the crank so not sure how it stacks up with the JB4 since numbers are measured at the wheels.
When it comes to tunes that work on multiple cars its hard to trust this kind of data. These could be numbers from an e9x N55 engine
2012 535i M-Sport
Previous BMW's: 87' 528e / 04' 325i / 07' 335i / 08' 335i / 08' 535i