JB4 Stage2 Boost Build up

erliban · 10-03-2013, 03:40 PM

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!

boris · 10-03-2013, 03:45 PM

Could just be delay in how the car is displaying boost. How are you reading boost?

evo335xi · 10-03-2013, 04:15 PM

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?

erliban · 10-03-2013, 04:15 PM

Quote:

Originally Posted by boris

Could just be delay in how the car is displaying boost. How are you reading boost?

I used the fuel gauge hijacking

madmanhiker · 10-03-2013, 07:09 PM

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.

erliban · 10-03-2013, 08:21 PM

Quote:

Originally Posted by madmanhiker

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.

boris · 10-04-2013, 11:57 AM

Quote:

Originally Posted by erliban

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.

hetzle · 10-04-2013, 01:08 PM

Mine performs the same way

bdoooh · 10-05-2013, 11:35 PM

Mine also performs the same way. You can feel the uneven acceleration. Map2 with a downpipe helps it quite a bit.

marc@x-ph.com · 10-06-2013, 09:55 AM

It doesn't feel normal but you should definitely log to see what's going on

Dark_Knight_335 · 10-06-2013, 11:20 AM

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

10-03-2013, 03:40 PM	#1
erliban New Member 5 Rep 26 Posts Drives: 2011 335i Convertible Join Date: Apr 2012 Location: US iTrader: (0)	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
boris Борис 31 Rep 505 Posts Drives: e92 n54 335i Join Date: Nov 2012 Location: CT iTrader: (1)	Could just be delay in how the car is displaying boost. How are you reading boost? __________________ 07 SG 335i GONE! COBB - Burger Motorsports -Ultimate Racing - Evolution Racewerks - TiAL- AMS In Winter Mode - Dunlop Wintersport 3D/Sport Edition Wheels
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10-03-2013, 04:15 PM	#3
evo335xi Lieutenant 33 Rep 451 Posts Drives: 335 Join Date: Mar 2013 Location: Ct iTrader: (1)	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, 07:09 PM	#5
madmanhiker Lieutenant Colonel 82 Rep 1,615 Posts Drives: '11 E92 335i Join Date: Jul 2008 Location: Jacksonville, Fl iTrader: (5) Garage List 2011 335i M-Sport [6.00] 2008 328i Sport Pre ... [0.00]	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. __________________ -madmanhiker jax,fl
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10-04-2013, 01:08 PM	#8
hetzle First Lieutenant 32 Rep 373 Posts Drives: E90 335i Join Date: Dec 2011 Location: San Francisco, California iTrader: (0)	Mine performs the same way __________________ 2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
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10-05-2013, 11:35 PM	#9
bdoooh Captain 112 Rep 969 Posts Drives: 2014 SSII M5 CP Join Date: Feb 2011 Location: Ohio iTrader: (2)	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
marc@x-ph.com BimmerPost Supporting Vendor 15 Rep 678 Posts Drives: 2010 e92 335i Join Date: Sep 2013 Location: USA iTrader: (0)	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
Dark_Knight_335 Came to the N55 Darkside 1112 Rep 12,740 Posts Drives: 2011 335 E93 M-Sport Join Date: May 2010 Location: NY/NJ iTrader: (28)	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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