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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > JB4 Stage2 Boost Build up



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      10-03-2013, 03:40 PM   #1
erliban
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JB4 Stage2 Boost Build up

Hi, I'm new to the tuner world, just had JB4 Stage2 installed on my 2011 N55 335i E93.

In Map1 under WOT, I noticed that the boost build up seems to be in steps: meaning it'll go to say 8 psi, stay for a little while and then jump to 10psi, then another "quantum" jump to 12 psi. It is not building up in a smooth way. Is this the expected behavior?

Thanks!
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      10-03-2013, 03:45 PM   #2
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Could just be delay in how the car is displaying boost. How are you reading boost?
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      10-03-2013, 04:15 PM   #3
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I was curious about this also. Mine will be at 10-11psi for a few seconds then jumps to 15 in the midrange, followed by a taper. Sometimes it does go to peak boost immediately though?
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      10-03-2013, 04:15 PM   #4
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Quote:
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Could just be delay in how the car is displaying boost. How are you reading boost?
I used the fuel gauge hijacking
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      10-03-2013, 07:09 PM   #5
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Garage List
log your runs. If you aren't logging them, then you don't truly know what's going on. If you don't know how to log, contact Terry @ BMS.
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      10-03-2013, 08:21 PM   #6
erliban
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Quote:
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log your runs. If you aren't logging them, then you don't truly know what's going on. If you don't know how to log, contact Terry @ BMS.

I imagine I'll need the USB cable for logging? I don't have one now.
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      10-04-2013, 11:57 AM   #7
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Quote:
Originally Posted by erliban View Post
I used the fuel gauge hijacking
A) Logging the car
B) Using an accurate/100% functioning boost gauge.

Only 2 ways that you will know truly whats going on.
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      10-04-2013, 01:08 PM   #8
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Mine performs the same way
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      10-05-2013, 11:35 PM   #9
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Mine also performs the same way. You can feel the uneven acceleration. Map2 with a downpipe helps it quite a bit.
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      10-06-2013, 09:55 AM   #10
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It doesn't feel normal but you should definitely log to see what's going on
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      10-06-2013, 11:20 AM   #11
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Get yourself a P3 gauge- it's a bit pricey but it displays lots of good information- among them boost, throttle, exhaust gas temperature, air intake temperature, coolant temperature, battery, and 0 to 60 timer. It takes a vent, but also allows the air to come through and looks like it was made for the BMW.

I love mine and I use it especially for the boost numbers and 0-60 times
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