Boost pressure question

NewCarGuy335i · 06-27-2018, 12:58 PM

I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.

IK6SPEED · 06-27-2018, 01:25 PM

Quote:

Originally Posted by NewCarGuy335i

I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.

Lancelot Sounds familiar....

Lancelot · 06-27-2018, 01:42 PM

Quote:

Originally Posted by IK6SPEED

Quote:

Originally Posted by NewCarGuy335i

I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.

Lancelot Sounds familiar....

Indeed got all this with JB4, gone when removing JB4 and now even with a flash tune all gear shifts are smooth as butter.

NewCarGuy335i · 06-27-2018, 01:46 PM

Quote:

Originally Posted by Lancelot

Quote:

Originally Posted by IK6SPEED

Quote:

Originally Posted by NewCarGuy335i

I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.

Lancelot Sounds familiar....

Indeed got all this with JB4, gone when removing JB4 and now even with a flash tune all gear shifts are smooth as butter.

You went with BM3? Considering that at this point.

Lancelot · 06-27-2018, 02:40 PM

No custom tune because bm3 doesn't fully support ah3 yet but 335i should be no problem.

NewCarGuy335i · 06-27-2018, 04:29 PM

ill uninstall the jb4 and see what happens, at this point i think the stock power would feel better than how it is now.

XutvJet · 06-28-2018, 01:18 AM

Did the issue start right after adding the charge pipe? If so, that's your problem, not the jp4. You've got a vacuum leak.

NewCarGuy335i · 06-28-2018, 02:08 AM

Quote:

Originally Posted by XutvJet

Did the issue start right after adding the charge pipe? If so, that's your problem, not the jp4. You've got a vacuum leak.

Yea right after the charge pipe. I've checked all connections and the o rings. How would I know if my vacuum line is compromised?

enjoythemusic · 06-28-2018, 10:26 AM

Who makes the chargepipe?

NewCarGuy335i · 06-28-2018, 10:27 AM

Quote:

Originally Posted by enjoythemusic

Who makes the chargepipe?

It's an er chargepipe. I'm under it right now checking the connections at the rubber

Mike@N54Tuning.com · 06-28-2018, 10:50 AM

Quote:

Originally Posted by NewCarGuy335i

I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.

Sounds like a boost leak on the chargepipe, oring missing, or meth bung caps missing. You can use the JB4 to help with diagnostics but recording a data log if you need help pinning down the issue.

Mike

JaredG_F30 · 06-28-2018, 11:21 AM

It's easy to kink the o-ring on the charge pipe so check that. Alos, you really have to push the pipe ontop the throttle body. The first time I put mine on it wasn't all the way connected and the car ran like crap.

NewCarGuy335i · 06-28-2018, 11:45 AM

Checked the rubber connection for the er charge pipe and found that it wasn't tightened and was practically not connected to the other half of the pipe. Just finished driving after tightening it and all seems well, only noticed a slightly rough shift pushing from 80-90 mph but that could've been nothing as it didn't happen a second time. Thank you everyone for all the input! Car feels amazing having boost again.

enjoythemusic · 06-28-2018, 01:40 PM

Great news!

06-27-2018, 12:58 PM	#1
NewCarGuy335i Private First Class 13 Rep 196 Posts Drives: Black Sapphire 335i Join Date: Oct 2016 Location: Bay Area iTrader: (0)	Boost pressure question I upgraded the charge pipe, and now it has rough shifts and is very jerky. When I unplugged the MAF, the rough shifts are gone but now I'm getting a code that the boost pressure is lower than expected and it definitely doesn't feel as fast for sure. I have a JB4 on it running map 1.
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06-27-2018, 02:40 PM	#5
Lancelot Major 576 Rep 1,296 Posts Drives: 2017 m550i Join Date: Sep 2012 Location: France iTrader: (0)	No custom tune because bm3 doesn't fully support ah3 yet but 335i should be no problem. __________________ 2017 M550i \| Sophistograu Previous cars: 2014 F30 ActiveHybrid 3 \| 2012 f20 M135i
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06-27-2018, 04:29 PM	#6
NewCarGuy335i Private First Class 13 Rep 196 Posts Drives: Black Sapphire 335i Join Date: Oct 2016 Location: Bay Area iTrader: (0)	ill uninstall the jb4 and see what happens, at this point i think the stock power would feel better than how it is now.
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06-28-2018, 01:18 AM	#7
XutvJet Major General 5605 Rep 5,394 Posts Drives: 2011 Cayman Base, 2016 M235 Join Date: Mar 2016 Location: Kansas City iTrader: (-1)	Did the issue start right after adding the charge pipe? If so, that's your problem, not the jp4. You've got a vacuum leak.
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06-28-2018, 10:26 AM	#9
enjoythemusic Captain 365 Rep 775 Posts Drives: 2014 BMW 435i Dinan Stage 4 Join Date: Feb 2017 Location: Florida iTrader: (0)	Who makes the chargepipe? __________________ Enjoy the Drive, Steven 2014 435i M-Opt, M LSD, Dinan CAI/IC/BTurbo/Stage 4, ER TIC/CP, GFB DV+, Fabspeed HJS cat DP & Mich PS4S.
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06-28-2018, 11:21 AM	#12
JaredG_F30 Lieutenant Colonel 1106 Rep 1,499 Posts Drives: 2014 335i, M-Sport, Manual Join Date: Dec 2016 Location: Raleigh, NC iTrader: (0)	It's easy to kink the o-ring on the charge pipe so check that. Alos, you really have to push the pipe ontop the throttle body. The first time I put mine on it wasn't all the way connected and the car ran like crap. __________________ 2014 F30 335i, M-Sport, 6MT, V804s, custom exhaust, CTS Turbo Intake & IC, FTP CP, VRSF DP, TMS Strut Brace, BM3 Stg 2, AEM WMI, H&R Sport Springs (381 whp, 429 wtq on Cali 91oct before WMI). SPI Films Blog/DIY Vids
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06-28-2018, 11:45 AM	#13
NewCarGuy335i Private First Class 13 Rep 196 Posts Drives: Black Sapphire 335i Join Date: Oct 2016 Location: Bay Area iTrader: (0)	Checked the rubber connection for the er charge pipe and found that it wasn't tightened and was practically not connected to the other half of the pipe. Just finished driving after tightening it and all seems well, only noticed a slightly rough shift pushing from 80-90 mph but that could've been nothing as it didn't happen a second time. Thank you everyone for all the input! Car feels amazing having boost again.
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06-28-2018, 01:40 PM	#14
enjoythemusic Captain 365 Rep 775 Posts Drives: 2014 BMW 435i Dinan Stage 4 Join Date: Feb 2017 Location: Florida iTrader: (0)	Great news! __________________ Enjoy the Drive, Steven 2014 435i M-Opt, M LSD, Dinan CAI/IC/BTurbo/Stage 4, ER TIC/CP, GFB DV+, Fabspeed HJS cat DP & Mich PS4S.
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