Sticky wastegates?

sirdaft1 · 02-13-2016, 11:27 PM

I'll mention that I've suspected that my turbos may have sticky wastegates in the past (irregular boost, then manually moved WG's, viola they worked). Tonight was a very similar story. On the expressway, boost would hit normal. Next hit, it would lag lag lag then hit hard out of nowhere. Next hit, max boost would be 7psi (target was 15psi). Logs look normal.

Every single time it wouldn't hit target, if I tapped the throttle a few times before going WOT, it would hit boost target just fine. Has anyone else experienced these issues?

Wondering if new turbos are on the horizon shortly

Jonah335 · 02-14-2016, 12:24 AM

Feel like I'm in the same boat but haven't had a chance to look into it. I'll report back when I find out more

Jklad · 02-14-2016, 01:04 PM

What tune you running these days??

sirdaft1 · 02-14-2016, 01:59 PM

Quote:

Originally Posted by Jklad

What tune you running these days??

JB4 + BB pump flash. Considering MHD but was thinking I'll hold off until new turbos for a custom MHD tune. You?

tc535i · 02-14-2016, 02:08 PM

Ever check your diverter valves?

Glennyd · 02-14-2016, 02:41 PM

How would I check the diverted valves and what else could be checked and how? Obviously I'm having the same issue. Lol

sirdaft1 · 02-14-2016, 02:44 PM

Quote:

Originally Posted by tc535i

Ever check your diverter valves?

Si. I run Forge DV's so I've cleaned them out/lubed them up. Not likely the issue unfortunately.

tc535i · 02-14-2016, 02:46 PM

Boost solenoids? Might be time for a vacuum test

Jonah335 · 02-14-2016, 03:09 PM

I Got new boost solenoids when it first happened. For a pull the spool improved but it went back to what was described in the first post

02-13-2016, 11:27 PM	#1
sirdaft1 Brigadier General 2246 Rep 3,353 Posts Drives: F85 X5M Join Date: Feb 2013 Location: Chicago West Burbs iTrader: (9) Garage List 2016 BMW X5M [9.00] 2012 BMW X5 35i (SOLD) [9.67] 1989 BMW 325i Track ... [10.00] 2007 E90 WTCC Wideb ... [8.50]	Sticky wastegates? I'll mention that I've suspected that my turbos may have sticky wastegates in the past (irregular boost, then manually moved WG's, viola they worked). Tonight was a very similar story. On the expressway, boost would hit normal. Next hit, it would lag lag lag then hit hard out of nowhere. Next hit, max boost would be 7psi (target was 15psi). Logs look normal. Every single time it wouldn't hit target, if I tapped the throttle a few times before going WOT, it would hit boost target just fine. Has anyone else experienced these issues? Wondering if new turbos are on the horizon shortly
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02-14-2016, 12:24 AM	#2
Jonah335 Private First Class 54 Rep 115 Posts Drives: 335i Join Date: Apr 2015 Location: Florida iTrader: (2)	Feel like I'm in the same boat but haven't had a chance to look into it. I'll report back when I find out more
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02-14-2016, 01:04 PM	#3
Jklad Lieutenant Colonel 422 Rep 1,643 Posts Drives: 2007 335i Coupe Join Date: Nov 2010 Location: Palatine, IL iTrader: (0)	What tune you running these days?? __________________ 2007 E92 335i MT
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02-14-2016, 02:08 PM	#5
tc535i Lieutenant Colonel 222 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	Ever check your diverter valves?
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02-14-2016, 02:41 PM	#6
Glennyd Second Lieutenant 66 Rep 246 Posts Drives: 2008 335 Join Date: Aug 2013 Location: CT iTrader: (2)	Diverted valves How would I check the diverted valves and what else could be checked and how? Obviously I'm having the same issue. Lol
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02-14-2016, 02:46 PM	#8
tc535i Lieutenant Colonel 222 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	Boost solenoids? Might be time for a vacuum test
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02-14-2016, 03:09 PM	#9
Jonah335 Private First Class 54 Rep 115 Posts Drives: 335i Join Date: Apr 2015 Location: Florida iTrader: (2)	I Got new boost solenoids when it first happened. For a pull the spool improved but it went back to what was described in the first post
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