Losing Boost After Shift N55 JB3

Swerd430 · 07-28-2011, 12:14 AM

Just installed my JB3 today. Feels great. But, sometimes when I shift during hard acceleration it feels like I lose boost. For example, from a standstill the boost feels great thru first and then I shift into second and it feels like my car has gone back to stock. Same thing happens going into third and forth. CEL hasn't come on but it just doesn't feel right. Any ideas? Thank you.

fasteddie222 · 07-28-2011, 12:16 AM

Quote:

Originally Posted by Swerd430

Just installed my JB3 today. Feels great. But, sometimes when I shift during hard acceleration it feels like I lose boost. For example, from a standstill the boost feels great thru first and then I shift into second and it feels like my car has gone back to stock. Same thing happens going into third and forth. CEL hasn't come on but it just doesn't feel right. Any ideas? Thank you.

same thing happens to me... on first i feel the power but the other gears are kinda weak... anyone else have the same problem?

Swerd430 · 07-28-2011, 12:37 AM

Quote:

Originally Posted by epimps22

same thing happens to me... on first i feel the power but the other gears are kinda weak... anyone else have the same problem?

emailed terry. i'm sure we will get to the bottom of this.

Andrew@ET · 07-29-2011, 01:44 PM

I know the feeling you are talking about.. With the stage 2 it is gone just hold out a little longer. You will be happy you did

Swerd430 · 07-29-2011, 02:21 PM

Quote:

Originally Posted by Andrew@EMSTUNING

I know the feeling you are talking about.. With the stage 2 it is gone just hold out a little longer. You will be happy you did

its normal? i feel like it shouldn't be.

Andrew@ET · 07-29-2011, 02:55 PM

Im not saying its normal but my car did it sometimes so I know the feeling you are experiencing. Usually it was from 3-4 shift and it would feel like it fell off boost after that shift. (slight lag and lower boost pressure) Feel free to Log and post it up.

Swerd430 · 07-29-2011, 03:30 PM

Quote:

Originally Posted by Andrew@EMSTUNING

Im not saying its normal but my car did it sometimes so I know the feeling you are experiencing. Usually it was from 3-4 shift and it would feel like it fell off boost after that shift. (slight lag and lower boost pressure) Feel free to Log and post it up.

Yeah I might log this weekend. Just been busy and need to open everything up again to connect USB. Haven't put it thru to the glove box. Could also be that my wife put 87 in on the last fill-up.

turugara · 07-29-2011, 03:37 PM

Quote:

Originally Posted by Swerd430

Could also be that my wife put 87 in on the last fill-up.

That...

would suck

theriz · 07-29-2011, 11:29 PM

well i dont think our cars have a linear powerband... like the M3. so power band would be 2.5 to 6k.... it kind of dies above that. wait for stage 2!

Andrew@ET · 07-30-2011, 01:18 AM

Starts to die around 5 ish. The stage 2 feels extremely linear now.

07-28-2011, 12:14 AM	#1
Swerd430 Private First Class 16 Rep 105 Posts Drives: 2016 F30 340XI M Sport Join Date: Feb 2011 Location: CT iTrader: (1) Garage List 2019 BMW/X3 M40i [0.00]	Losing Boost After Shift N55 JB3 Just installed my JB3 today. Feels great. But, sometimes when I shift during hard acceleration it feels like I lose boost. For example, from a standstill the boost feels great thru first and then I shift into second and it feels like my car has gone back to stock. Same thing happens going into third and forth. CEL hasn't come on but it just doesn't feel right. Any ideas? Thank you.
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07-29-2011, 01:44 PM	#4
Andrew@ET Brigadier General 194 Rep 4,037 Posts Drives: Red thing Join Date: May 2007 Location: Earth iTrader: (9)	I know the feeling you are talking about.. With the stage 2 it is gone just hold out a little longer. You will be happy you did
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07-29-2011, 02:55 PM	#6
Andrew@ET Brigadier General 194 Rep 4,037 Posts Drives: Red thing Join Date: May 2007 Location: Earth iTrader: (9)	Im not saying its normal but my car did it sometimes so I know the feeling you are experiencing. Usually it was from 3-4 shift and it would feel like it fell off boost after that shift. (slight lag and lower boost pressure) Feel free to Log and post it up.
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07-29-2011, 11:29 PM	#9
theriz Brigadier General 408 Rep 3,583 Posts Drives: 2017 M3 Join Date: Feb 2011 Location: Ventura County, CA iTrader: (2) Garage List 2017 F80 M3 [0.00] 2011 335i M-Sport [4.00] 2015 M3 [0.00] 2009 X5 [10.00]	well i dont think our cars have a linear powerband... like the M3. so power band would be 2.5 to 6k.... it kind of dies above that. wait for stage 2!
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07-30-2011, 01:18 AM	#10
Andrew@ET Brigadier General 194 Rep 4,037 Posts Drives: Red thing Join Date: May 2007 Location: Earth iTrader: (9)	Starts to die around 5 ish. The stage 2 feels extremely linear now.
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