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Old 09-16-2020, 11:21 PM   #1
TheNumb55
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Default 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
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Old 09-17-2020, 09:19 AM   #2
Mike1Juliet
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Quote:
Originally Posted by TheNumb55 View Post
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


Have you talked to the tuner about what could be potentially causing the issue?


Can you post your data logs?
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Old 09-17-2020, 09:36 AM   #3
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Originally Posted by Mike1Juliet View Post
data logs?
^^^^^
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Old 09-17-2020, 11:08 AM   #4
TheNumb55
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Originally Posted by Mike1Juliet View Post
Have you talked to the tuner about what could be potentially causing the issue?

Yes but the only thing they have suggested so far is going back to the oem 2 port boost controller which I don't have anymore.


Can you post your data logs?
Here's a link to the most recent WOT log
https://drive.google.com/file/d/1hen...ew?usp=sharing
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Old 09-17-2020, 12:38 PM   #5
alapilusa
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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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Old 09-17-2020, 03:33 PM   #6
TheNumb55
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Originally Posted by alapilusa View Post
You should upload the data to datazap, allow the data to be available to the public, and post the link in this thread.
Thanks! that's a lot easier than google drive lol

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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Old 09-17-2020, 04:24 PM   #7
Mike1Juliet
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Originally Posted by TheNumb55 View Post
Thanks! that's a lot easier than google drive lol

https://datazap.me/u/thenumb55/s?log=0&data=10-30
Where is this spike exactly? Even with the 3-port EBCS you will still have some fluctuation.
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Old 09-17-2020, 04:30 PM   #8
TheNumb55
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Originally Posted by Mike1Juliet View Post
Where is this spike exactly? Even with the 3-port EBCS you will still have some fluctuation.
At about 3370rpm
It looks worse when there are more data points.


Last edited by TheNumb55; 09-17-2020 at 04:35 PM.
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Old 09-17-2020, 06:18 PM   #9
Mike1Juliet
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Quote:
Originally Posted by TheNumb55 View Post
At about 3370rpm
It looks worse when there are more data points.

Well you have enough data to be honest. Your logs are making points every 5-15rpm.
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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Old 09-18-2020, 09:43 AM   #10
TheNumb55
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Quote:
Originally Posted by Mike1Juliet View Post
Well you have enough data to be honest. Your logs are making points every 5-15rpm.
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.
Gotcha..
So do you think that small overboost is just a tuning issue then?
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Old 09-18-2020, 10:02 AM   #11
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Gotcha..
So do you think that small overboost is just a tuning issue then?
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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Old 09-18-2020, 10:02 AM   #12
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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
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Old 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.
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Old 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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Old 09-19-2020, 06:38 PM   #15
TheNumb55
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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.
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Old 09-19-2020, 10:24 PM   #16
Trob
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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.
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Old 09-19-2020, 11:22 PM   #17
TheNumb55
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Quote:
Originally Posted by Trob View Post
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.
Will do. it's not a boomba bpv is it? lol

I'm very much tempted to just drive up to chicago next week to get a pro tune lol
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Old 09-21-2020, 09:26 AM   #18
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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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Old 09-21-2020, 11:15 AM   #19
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Quote:
Originally Posted by gn4rwhals View Post
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.
I had the same issue
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Old 09-21-2020, 04:28 PM   #20
gn4rwhals
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Quote:
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I had the same issue
How did you fix it?
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