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09-16-2020, 11:21 PM | #1 |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
Grimmspeed 3 port EBCS Boost Spiking (2017 wrx)
Hey guys, I'm in the process of getting and E tune and I'm running into the problem of boost spiking even though I have a 3 port grimmspeed ebcs.
Any suggestions on troubleshooting other than the tune (which is locked by my tuner) https://photos.app.goo.gl/pn81rUR37buQgvGJA
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Last edited by TheNumb55; 09-16-2020 at 11:25 PM. Reason: add image |
09-17-2020, 09:19 AM | #2 | |
Scooby Newbie
Member#: 486921
Join Date: Jun 2018
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2018 Outback Tungsten |
Quote:
Can you post your data logs? |
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09-17-2020, 09:36 AM | #3 |
Scooby Newbie
Member#: 480524
Join Date: Jan 2018
Location: Pa
Vehicle:2015 WRX Black |
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09-17-2020, 11:08 AM | #4 | |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
Quote:
https://drive.google.com/file/d/1hen...ew?usp=sharing |
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09-17-2020, 12:38 PM | #5 |
Scooby Newbie
Member#: 424692
Join Date: Jun 2015
Location: NJ
Vehicle:2015 WRX WRB |
You should upload the data to datazap, allow the data to be available to the public, and post the link in this thread.
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09-17-2020, 03:33 PM | #6 | |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
Quote:
https://datazap.me/u/thenumb55/s?log=0&data=10-30 Last edited by TheNumb55; 09-17-2020 at 03:39 PM. |
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09-17-2020, 04:24 PM | #7 | |
Scooby Newbie
Member#: 486921
Join Date: Jun 2018
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2018 Outback Tungsten |
Quote:
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09-17-2020, 04:30 PM | #8 |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
Last edited by TheNumb55; 09-17-2020 at 04:35 PM. |
09-17-2020, 06:18 PM | #9 | |
Scooby Newbie
Member#: 486921
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Chapter/Region:
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Location: Upstate NY
Vehicle:2018 Outback Tungsten |
Quote:
That being said I wouldn't call that a spike, thats your turbo being fully spooled and your car regulating the maximum boost. Notice how its pretty flat throughout the rest of your rev range as it begins to taper at the higher RPM. The stock WRX turbo isn't that big but its very efficient being a twin-scroll. Older turbo cars tended to have a big lag where the turbos wouldn't fully spool or produce max boost until the end of the RPM range and you'd get a huge surge in power. |
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09-18-2020, 09:43 AM | #10 | |
Scooby Newbie
Member#: 500179
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Location: Central Illinois
Vehicle:2017 WRX |
Quote:
So do you think that small overboost is just a tuning issue then? |
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09-18-2020, 10:02 AM | #11 |
Scooby Newbie
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Vehicle:2018 Outback Tungsten |
Well from some of the other recent threads about boost spikes and the like it seems to happen for a few different reasons however it doesn't seem like your car is exhibiting them. I'm not a tuner but it totally could be tune related.
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09-18-2020, 10:02 AM | #12 |
Scooby Specialist
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Join Date: Aug 2016
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MWSOC
Location: Detroit, MI
Vehicle:2017 WRX Crystal White Pearl |
Boost curve looks a bit wacky, I would discuss this with your tuner and ask them what the boost target is set at and if the creep up to 21psi in the 4000ish range is intended.
You don't have any boost parameters logged so we can't really tell if this is intentional or not. https://datazap.me/u/thenumb55/s?log...30&zoom=97-445 |
09-18-2020, 10:14 AM | #13 |
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I fail to see what the issue is here. Looks fine. An EBCS operates at a set interval. IDK what the "refresh rate" (for lack of a better term) is of the Grimmspeed unit, but it actuates X (20-30?) number of times per second. That is going to give it an inherently spiked appearance because it can never be fully smooth. That's what a peak and a valley are in your boost chart. You can actually count ~25 peaks and valleys on your datazap between 3 and 4 seconds if you add time into the chart.
I do not think it's really an over boost issue. The turbo was just more efficient at that RPM range between the refreshes in your EBCS. Also, that "over boost" at 3370 RPM is so minuscule, I wouldn't even call it that. |
09-18-2020, 10:17 AM | #14 |
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That all looks pretty normal to me. If you really want to see if it is, log commanded boost and compare it to your actual boost to see if you are overboosting by a significant amount.
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09-19-2020, 06:38 PM | #15 |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
My tuner (iaTuning) says that the thing to check is for a boost leak and a faulty BPV.
"Since the stock EBCS is not available, and the boost curve’s dip remains, then here are ideas of how to proceed. Perform a Boost leak test and verify the BPV is not leaking prematurely." I guess his concern may be that the boost drops down after the initial "spike" I'll datalog target boost tonight. |
09-19-2020, 10:24 PM | #16 |
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I have kind of the same problem on my 2011 Wrx. For me at target boost of 20psi I just keep build boost to cut off 24psi. I have the same tuner IA Tuning Stephen Clark. He did not help me at all. Said it was my new turbo. So I’m still having this problem.
I’m interested in the bpv as I put a brand new one on and this problem started. If you figure it out let us know. |
09-19-2020, 11:22 PM | #17 | |
Scooby Newbie
Member#: 500179
Join Date: Apr 2019
Location: Central Illinois
Vehicle:2017 WRX |
Quote:
I'm very much tempted to just drive up to chicago next week to get a pro tune lol |
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09-21-2020, 09:26 AM | #18 |
Scooby Specialist
Member#: 453427
Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Detroit, MI
Vehicle:2017 WRX Crystal White Pearl |
I have a stock BPV and do not have this boost issue, I understand the logic that it could be a boost leak, but I doubt there is faulty hardware if the boost ramps up and stays somewhat stable as it does later in the pull.
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09-21-2020, 11:15 AM | #19 |
Scooby Newbie
Member#: 480524
Join Date: Jan 2018
Location: Pa
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09-21-2020, 04:28 PM | #20 |
Scooby Specialist
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Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Detroit, MI
Vehicle:2017 WRX Crystal White Pearl |
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