No Boost, No Leaks, Vacuum good.

fredcase · 05-05-2020, 08:28 PM

First Drive of the season, no boost. like, 2psi tops.

i sent my MSD80 for mosfets repair (preventative) just got it back, and over the winter I did a LPFP upgrade.

i have tried,

reflash BEF
Updated firmware
vacuum is good, post boost solenoid
wastegates move good by hand, no obstructions
charged system to 20psi, no leaks.

If someone stomps on gas, I see a 8psi target, but, wastegates not moving.

Is there something on the DME that controls that? Or, could my jb4 board be fried?

Any insight?

quick log attached.

alexwilcox29 · 05-05-2020, 10:04 PM

I would look more into the jb4, I know there's setting to adjust the wastegates a lot! Sometimes I set mine entirely open to avoid rattle but when floored they eventually snap shut and start boosting

E93Beast · 05-11-2020, 01:20 AM

Quote:

Originally Posted by alexwilcox29

I would look more into the jb4, I know there's setting to adjust the wastegates a lot! Sometimes I set mine entirely open to avoid rattle but when floored they eventually snap shut and start boosting

It was his rear turbo

Saif2018 · 05-11-2020, 07:05 AM

Quote:

Originally Posted by fredcase

First Drive of the season, no boost. like, 2psi tops.

i sent my MSD80 for mosfets repair (preventative) just got it back, and over the winter I did a LPFP upgrade.

i have tried,

reflash BEF
Updated firmware
vacuum is good, post boost solenoid
wastegates move good by hand, no obstructions
charged system to 20psi, no leaks.

If someone stomps on gas, I see a 8psi target, but, wastegates not moving.

Is there something on the DME that controls that? Or, could my jb4 board be fried?

Any insight?

quick log attached.

According to the log, your Wastegate duty cycles are maxed out constantly! targeting 15psi, but its not even making 1psi!

Something is seriously wrong here.

You need to get your turbos/wastegates checked properly.

feuer · 05-11-2020, 07:08 PM

Probably wastegate jammed up open.

blown07 · 05-11-2020, 08:27 PM

I remember seeing this thread that possibly shows the position of the mosfets for the boost solenoids
https://www.e90post.com/forums/showt...t=30BB&page=17
Normally I wouldn't have suggested this but you did send the DME out to get upgraded.

05-05-2020, 10:04 PM	#2
alexwilcox29 Second Lieutenant 78 Rep 203 Posts Drives: 2009 335i Join Date: Dec 2017 Location: Anthem, Arizona iTrader: (0)	I would look more into the jb4, I know there's setting to adjust the wastegates a lot! Sometimes I set mine entirely open to avoid rattle but when floored they eventually snap shut and start boosting __________________ Crimson LCI E90 N54 auto - sold Lemans LCI E92 N55 manual - current
	Appreciate 0 Quote

05-11-2020, 07:08 PM	#5
feuer Major General 4287 Rep 9,223 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	Probably wastegate jammed up open.
	Appreciate 0 Quote

05-11-2020, 08:27 PM	#6
blown07 Lieutenant 205 Rep 452 Posts Drives: 335i Join Date: Jul 2013 Location: Tijuana iTrader: (0)	I remember seeing this thread that possibly shows the position of the mosfets for the boost solenoids https://www.e90post.com/forums/showt...t=30BB&page=17 Normally I wouldn't have suggested this but you did send the DME out to get upgraded. __________________ 335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R 335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
	Appreciate 0 Quote