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Not Meeting Boost Target
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01-19-2019, 09:25 PM | #1 |
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Someone with experience looking at these logs please take a gander. Target boost 2-3 psi higher than I'm able to achieve.
https://datazap.me/u/wellstileandsto...g=1&data=3-12#
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's Last edited by The Silver Slammer; 01-21-2019 at 06:41 AM.. |
01-21-2019, 06:42 AM | #2 |
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Anybody?
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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01-21-2019, 12:49 PM | #3 |
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01-21-2019, 01:19 PM | #4 |
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I would expect it to be closer, it was when I had the JB4 hooked up to it but I know JB4 does boost fooling. I'm running only MHD right now, that's what this log was from.
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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01-21-2019, 02:11 PM | #5 |
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As the previous poster said, you're not logging properly. Start in third gear, not first, and do a pull from about 3k RPMs to red line.
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01-22-2019, 06:40 AM | #6 | |
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2. If you want 3rd gear only you can zoom in and take a snap shot of the 3rd gear pull alone and see the delta between the target and the actual boost. If you zoom in you can clearly see the car never reaches target boost, ever. Right after the hitting 3rd gear it climb slightly but falls as RPMs climb while target boost either climbs or plains out. At one time it appears to be even 3+ psi below target. In fact at 5031rpm its 4psi exactly low. I don't believe thats normal even for a stock turbo. Just looking for some insight as to why this is the case. I have everything in my sig installed with exception of the JB4 which I've taken out for the time. I've also installed the GFB DV+.
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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01-22-2019, 10:52 AM | #7 | |
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1 . Calm the F down |
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01-22-2019, 11:08 AM | #8 |
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Not meeting target can be a number of things. Worn wastegates, boost leak, leaking DVs, the list goes on.
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04-02-2019, 12:03 PM | #10 |
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which intercooler do you run? I had the ARM 5" stepped with stock connections. I swapped for silicone connections and heavy duty clamps and literally picked up a full PSI in doing so...
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04-02-2019, 01:17 PM | #11 |
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Turns out it's fairly normal to have boost tapering down to 11-13 psi range at the upper range of rpms on these N55s. Custom tune gets you a little more, E85 gets you a little more, PI gets you a little more and all the airflow things we do to these gets you a little less, but more CFMs (cubic feet per minute) so more power in the end. Funny how everyone equates boost to power no matter what. It's all about volume of air guys. Without getting too nerdy, basically we remove the kinks, tight bends, inlet and outlet restrictions and increase airflow in and out of the engine we can actually see boost stay the same or even drop a bit, but still make more power due to volume of airflow. the kinks, bends and restrictions are the resistance that it takes to make more psi. Like a 1" diameter hose flowing 50 gallons per minute or a 2" hose flowing 50 gallons per minute same volume but lower psi. but the bigger hose has the capacity to flow much, much more.
(This is all setting tuning/fueling aside) Hopefully this makes sense.
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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04-02-2019, 01:19 PM | #12 |
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VRSF 7"
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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04-02-2019, 03:21 PM | #13 | |
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Boost is a measure of pressure and not airflow, to your point. One goal to make power is to up the boost, another is to remove all airflow inefficiencies. Or, you can do both...
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04-03-2019, 05:54 AM | #14 |
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What part of Georgia you in Phil?
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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04-03-2019, 08:49 AM | #15 |
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Roswell/Marietta/Alpharetta
you?
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2011 N55 e92 Msport -Alpine White AT MHD Stage 2+, ARM 5" stepped I/C, PPK (coded over), Cobb charge pipe, gutted Xi downpipe, BMS intake, ARM I/C hose upgrade, PE mod, ST coilovers, 18x9 Apex ARC8 |
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04-03-2019, 11:56 AM | #16 |
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Evans/Augusta
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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04-05-2019, 07:11 AM | #18 |
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So I've got the last hard part left to install to make sure I am completely sure I don't have a boost leak and to try and maximize the stock turbo...the turbo to intercooler charge pipe! Besides messing with the wastegate or boost solenoid, the logs don't look like either of those could be an issue. But I hear this high pitched squeal when the car comes under load and starts making boost. This is the last place I haven't thoroughly gone through to check for cracks, leaks, etc.
Just showed up yesterday from Top Gear Solutions (VRSF). Here's a link for anyone who needs it. https://topgearsolutions.com/vrsf-n5...free-shipping/ However it doesn't come with a new O-ring. Anyone have a part # on a replacement? If I'm gonna do it I wanna replace the O-ring while I'm at it. Got the N20 TMAP Sensor on the way too so I can target a higher PSI with MHD and hopefully make more power and get a better 1/4 mile time!
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2011 335I, E90, AT, Sport Package, FBO, Eibach 1" Lowering Kit w/ Koni Orange. MHD, 88k miles 2nd owner - Sold
2003 330XI, MT, bone stock, 160k miles - Sold 1988 325I Coupe, MT - Retired, 280k miles - Sold 2019 X7 XDRIVE 40I - Wife's |
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01-20-2020, 06:55 PM | #19 |
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I didn't want to start a new thread but my situation is the dme keeps lowering the boost target. One log from Oct you'll see boost and target psi looking good. Should be 21-22psi. On the same map, the Jan log shows the dme lowered target down to 17psi so my boost hits around 19psi. I've started noticing this as the weather got colder. It seems the less traction I have the more the dme adjust timing or boost. I've experimented with this. I've run the map on a 60°f day and again on 35°-50°. The car would have a more difficult time keep tires on the pavement 3rd gear and up and reduce timing or boost. Dsc always off.
I know this is odd. I've tried different maps and reset adaptions. No change. The car limits power based on traction. At least that what I think or the dme could be faulty. Im waiting to hear back from my tuner. My 3.5tmap gave me some issues months ago but my tuner wrote the voltage in the map which fixed the startup issues. Anyone have any idea why this is happening or experienced this? I'm running hybrid turbos and I dont see a boost leak. I'll need to check the charge pipe though. Not sure if that would affect target data though. Could it be the map? Dont seem likely to me. Any help or leads appreciated. https://datazap.me/u/brakthru1/log-1...og=0&data=3-23 |
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01-20-2020, 07:44 PM | #20 | |
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01-20-2020, 10:21 PM | #22 |
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Nah
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