Need Clean MHD Log for Comparison Stk Turbo

Jwallace410 · 10-11-2019, 11:40 AM

Running a custom tune on 2011 Stock Turbo n55, w/ IC. 106,000 mi. I have noticed my WGDC% has been pretty high throughout all my logs, 80-95%. Stock Map was showing about 56% on reg boost levels.

Could someone post a link to one of their Tuned Stock Turbo Logs for comparison?

I'd like to get some info and narrow down some things, or determine if this is Normal for targeting 17psi on stock turbo.

Thanks.

weehe126 · 10-11-2019, 12:34 PM

Yes, high/maxed wgdc is expected at 17psi on stock turbo.

Jwallace410 · 10-12-2019, 10:51 AM

Question.. I just replaced the Boost Solenoid about two days ago. This morning, I noticed "turbo flutter" in the chargepipe area, but it was sporatic( not happening every time). FIRST time.. I only noticed it at low speeds (1st-2nd gear, moderate throttle and letting off around 3k rpm) or occasionally getting it when revving in Park.

Can a new Boost Solenoid be related to the Turbo Flutter im hearing? As in, the DME/ Custom tune have compensated for a weak Boost Solenoid and now have to be readjusted, or is it more likely to be a seperate issue, a bad DV?

weehe126 · 10-12-2019, 02:06 PM

Only reason a boost solenoid could affect DV flutter is if it wasn't holding boost at part throttle. Sounds like that might be the case. A bad DV would leak boost.

Jwallace410 · 10-12-2019, 06:58 PM

https://datazap.me/u/jwallace410/v08...-19-33&mark=62

Basically all my logs look like this. Spool to target then Immediately drop below target by about 3psi. I've been replacing sensors and parts pretty much every month and it seems like either the old part was still ok or another issue pops up.

Am I right to assume that if I continue to get turbo flutter that possibly I have a bad DV? 106'000 mi and running tuned since 70,000mi. If not, what else could I check? Vaccum lines to WG actuator, or is this something thats "normal" when everything is running properly, and target>psi is something else.

Also, its only in the low rpm, lartial throttle I hear the flutter. WOT i get the normal "whoosh" of the DV, not the same flutter (similar to some supras, ect) Sent same log set to tuner, waiting for reply.

10-11-2019, 11:40 AM	#1
Jwallace410 Private 10 Rep 53 Posts Drives: 2011 BMW 335i e93 Join Date: Nov 2017 Location: JoCo, NC iTrader: (0)	Need Clean MHD Log for Comparison Stk Turbo Running a custom tune on 2011 Stock Turbo n55, w/ IC. 106,000 mi. I have noticed my WGDC% has been pretty high throughout all my logs, 80-95%. Stock Map was showing about 56% on reg boost levels. Could someone post a link to one of their Tuned Stock Turbo Logs for comparison? I'd like to get some info and narrow down some things, or determine if this is Normal for targeting 17psi on stock turbo. Thanks. __________________ U.S. Army (Ret.) OIF/OEF W.I.A. (They tried, but I'm too Stubborn to die like that)
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10-11-2019, 12:34 PM	#2
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Yes, high/maxed wgdc is expected at 17psi on stock turbo.
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10-12-2019, 10:51 AM	#3
Jwallace410 Private 10 Rep 53 Posts Drives: 2011 BMW 335i e93 Join Date: Nov 2017 Location: JoCo, NC iTrader: (0)	Question.. I just replaced the Boost Solenoid about two days ago. This morning, I noticed "turbo flutter" in the chargepipe area, but it was sporatic( not happening every time). FIRST time.. I only noticed it at low speeds (1st-2nd gear, moderate throttle and letting off around 3k rpm) or occasionally getting it when revving in Park. Can a new Boost Solenoid be related to the Turbo Flutter im hearing? As in, the DME/ Custom tune have compensated for a weak Boost Solenoid and now have to be readjusted, or is it more likely to be a seperate issue, a bad DV?
	Appreciate 0 Quote

10-12-2019, 02:06 PM	#4
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Only reason a boost solenoid could affect DV flutter is if it wasn't holding boost at part throttle. Sounds like that might be the case. A bad DV would leak boost.
	Appreciate 0 Quote

10-12-2019, 06:58 PM	#5
Jwallace410 Private 10 Rep 53 Posts Drives: 2011 BMW 335i e93 Join Date: Nov 2017 Location: JoCo, NC iTrader: (0)	https://datazap.me/u/jwallace410/v08...-19-33&mark=62 Basically all my logs look like this. Spool to target then Immediately drop below target by about 3psi. I've been replacing sensors and parts pretty much every month and it seems like either the old part was still ok or another issue pops up. Am I right to assume that if I continue to get turbo flutter that possibly I have a bad DV? 106'000 mi and running tuned since 70,000mi. If not, what else could I check? Vaccum lines to WG actuator, or is this something thats "normal" when everything is running properly, and target>psi is something else. Also, its only in the low rpm, lartial throttle I hear the flutter. WOT i get the normal "whoosh" of the DV, not the same flutter (similar to some supras, ect) Sent same log set to tuner, waiting for reply. Last edited by Jwallace410; 10-12-2019 at 07:18 PM.. Reason: New thought
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