JB Stage 1 N55 X5

Hey there. Had the JB on for about 10 days and the extra power (up to 50hp claims) is just not there. Feels a bit sluggish on bottom end. Boosting about 10 lbs. Had many turbos before and you should definitely feel 50 whp difference. Ran a few times with a friend with a '13 335i and pulled away every time. Any experiences out there?

Originally Posted by Mau

Hey there. Had the JB on for about 10 days and the extra power (up to 50hp claims) is just not there. Feels a bit sluggish on bottom end. Boosting about 10 lbs. Had many turbos before and you should definitely feel 50 whp difference. Ran a few times with a friend with a '13 335i and pulled away every time. Any experiences out there?

I would be surprised as well to not feel a difference, but even at 50whp a 335 is going to walk you hard, that's a HUGE weight difference to account for. I believe it's nearly 1400 lbs. An old metric that I was once told was 10lbs/hp for a simple comparison. So to really keep up with a 335 you need 140hp (ballpark) to account for the weight.