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Forced Induction
Aftermarket superchargers & turbos as well as tuning for stock BMW turbos (N54 motor - 135i / 335i / 535i). Force-fed discussion to make your car go faster

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  #1  
Old 01-25-2013, 08:46 PM
Mau Mau is offline
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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?
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Old 02-17-2013, 11:45 AM
MustGoFast MustGoFast is offline
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Originally Posted by Mau View Post
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.
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Old 03-24-2014, 01:40 PM
oldman12 oldman12 is offline
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Agreed with Mau.... Have you done any logs? Start there to make sure you are really getting boost. Also, what map are you on? That makes a difference. 50whp should make a difference, but you are in a 4,300 truck, so I would shoot for some intake and exhaust changes and hit 15 psi and with perfect timing, that will get you 80whp on pump gas.
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Old 03-27-2014, 08:12 PM
mike@x-ph.com mike@x-ph.com is online now
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i have dynod my car on stage one Jb it provided around 30 whp gains
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Old 03-27-2014, 08:44 PM
Mau Mau is offline
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i have dynod my car on stage one Jb it provided around 30 whp gains

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Old 03-27-2014, 08:48 PM
mike@x-ph.com mike@x-ph.com is online now
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Dont have them anymore, but this a customer'sdyno on a 328 and he got around 18 whp on stage one for the N26. the stage 1 for the N55 is even more aggressive.
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