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      05-26-2023, 11:38 PM   #1
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In the middle of a tune, and my tuner said my wastegate duty cycle is high. Reviewed logs and the Wastegate Duty Cycle is 85-91%.

I checked and re-installed the charge pipes
Replaced J-pipe
Rechecked all clamps and couplers
Rechecked any plugs in the charge and J-pipe
Finally, had a smoke test which was negative

Besides the high WGDC, car drives fine.

What else am I missing/forgetting to check?
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      05-27-2023, 02:24 AM   #2
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Who are you tuned by?
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      05-27-2023, 08:24 AM   #3
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Quote:
Originally Posted by Devincey View Post
Who are you tuned by?
Bend Calibration
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      05-27-2023, 10:20 AM   #4
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WGDC?

Something with wastegate operation?
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      05-27-2023, 10:23 AM   #5
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Quote:
Originally Posted by mapster37 View Post
WGDC?

Something with wastegate operation?
Wastegate duty cycle
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      05-27-2023, 11:37 AM   #6
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My understanding is that the only other two things it could be is the turbos or the wastegates themselves are slowly checking out.

Are you having this issue while tuning on E85 (E50+)? or also on 91/93?
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      05-27-2023, 11:40 AM   #7
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Quote:
Originally Posted by ralphsmithiii View Post
My understanding is that the only other two things it could be is the turbos or the wastegates themselves are slowly checking out.

Are you having this issue while tuning on E85 (E50+)? or also on 91/93?
91

Per my tuner, all parameters they’re Looking at are being hit, but just the signals from the wastegate duty is off.
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      05-29-2023, 10:40 AM   #8
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It could indicate a boost leak, turbocharger failure, or simply that your map is requesting a high boost, causing your turbos to work harder.

It's best to check in with your tuner on whether this level of WGDC is standard for the map they provided you with. They will be able to give the most accurate feedback
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      05-31-2023, 10:14 AM   #9
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I have being chasing same issue here. PS2+ Jordan Tune.

Try to do a boost leak test injecting 30psi or so. Some leaks only appear when pressure is applied.


Quote:
Originally Posted by F80RN View Post
In the middle of a tune, and my tuner said my wastegate duty cycle is high. Reviewed logs and the Wastegate Duty Cycle is 85-91%.

I checked and re-installed the charge pipes
Replaced J-pipe
Rechecked all clamps and couplers
Rechecked any plugs in the charge and J-pipe
Finally, had a smoke test which was negative

Besides the high WGDC, car drives fine.

What else am I missing/forgetting to check?
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      05-31-2023, 10:26 AM   #10
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Quote:
Originally Posted by F80RN View Post
In the middle of a tune, and my tuner said my wastegate duty cycle is high. Reviewed logs and the Wastegate Duty Cycle is 85-91%.

I checked and re-installed the charge pipes
Replaced J-pipe
Rechecked all clamps and couplers
Rechecked any plugs in the charge and J-pipe
Finally, had a smoke test which was negative

Besides the high WGDC, car drives fine.

What else am I missing/forgetting to check?
How about the O-rings on charge pipes/J pipe? Have you tried re-calibrating wastegates to see if they pass or fail with ISTA?
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      05-31-2023, 11:13 AM   #11
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Do your charge pipes have meth bungs? If so, double check those
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      05-31-2023, 12:55 PM   #12
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Personally, regularly hitting 82-85 WGDC, MHD Stage 1 E30 OTS Tune, E47.... 850' elevation and 70-80 degree weather... Runs like a top, very limited timing corrections and no throttle closures... It is my understanding that 80-90% wgdc are not out of the ordinary on EWG cars like the N55 / S55 and do vary somewhat dramatically based on elevation and ambient conditions.

Last edited by E70M57; 05-31-2023 at 01:04 PM..
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      05-31-2023, 08:34 PM   #13
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Quote:
Originally Posted by prisco View Post
I have being chasing same issue here. PS2+ Jordan Tune.

Try to do a boost leak test injecting 30psi or so. Some leaks only appear when pressure is applied.
The shops I’ve contacted don’t have the equipment required for a boost leak test. One shop that claims they can do a boost leak test has stopped replying to me.
Quote:
Originally Posted by Wanted_M View Post
How about the O-rings on charge pipes/J pipe? Have you tried re-calibrating wastegates to see if they pass or fail with ISTA?
I’m waiting on the O-rings to arrive. But I haven’t thought of the ISTA calibration. I’ll reach out to the shop I frequent.
Quote:
Originally Posted by jfritz27 View Post
Do your charge pipes have meth bungs? If so, double check those
Yes, it has meth bungs. I double checked and they’re tight. Maybe I’ll remove and reapply some thread tape. I’m thinking of buying new couplers and v-bands for the charge pipes?
Quote:
Originally Posted by E70M57 View Post
Personally, regularly hitting 82-85 WGDC, MHD Stage 1 E30 OTS Tune, E47.... 850' elevation and 70-80 degree weather... Runs like a top, very limited timing corrections and no throttle closures... It is my understanding that 80-90% wgdc are not out of the ordinary on EWG cars like the N55 / S55 and do vary somewhat dramatically based on elevation and ambient conditions.
I’m at pretty much sea level (OC,CA)
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      05-31-2023, 09:29 PM   #14
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F80RN can you post the latest logs?
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      05-31-2023, 10:42 PM   #15
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Quote:
Originally Posted by slaughter.mode View Post
F80RN can you post the latest logs?

I’m not sure if it’s appropriate given we are still working through tune? Or if that reveals differences in tuning methods between different tuners?

Might be overthinking this but I’d rather wait to both have everything finalized and have permission from Bend before doing so. I will say that Ian has said all targets are being met, just WGDC is a smidge off for his liking.
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      05-31-2023, 11:27 PM   #16
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Quote:
Originally Posted by F80RN View Post
I’m not sure if it’s appropriate given we are still working through tune? Or if that reveals differences in tuning methods between different tuners?

Might be overthinking this but I’d rather wait to both have everything finalized and have permission from Bend before doing so. I will say that Ian has said all targets are being met, just WGDC is a smidge off for his liking.
The logs wont reveal the mechanics behind the tune, just the outcome. Just trying to get more eyes on it from folks who may have a helpful answer and chime in.
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      05-31-2023, 11:57 PM   #17
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Quote:
Originally Posted by slaughter.mode View Post
The logs wont reveal the mechanics behind the tune, just the outcome. Just trying to get more eyes on it from folks who may have a helpful answer and chime in.
Understood

Keep in mind, this is the first E50 log from yesterday. I received a new map but haven’t had a chance to flash it.


https://bootmod3.net/log?id=64761832ae729b57485c440c
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      06-01-2023, 06:21 AM   #18
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Here is a link to a recent Datazap log from the MHD tune I mentioned above; for comparative reference. Looking at yours it appears that the timing corrections are bit more significant and do not fully clear by the end of the run. Personally, I notice the car runs quite a bit stronger as the timing corrections clear and the ign advance levels across all cylinders. I have been working with E blends and it has taken me to around E45 to achieve this type of limited correction log on the E30 OTS map. Personally...I don't see much concern with your WGDC as you're below 100 and hitting target... but timing drops in the upper RPM range would be something I'd focus on.

https://datazap.me/u/ihickman/log-16...2-4-5-23-37-54
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      06-01-2023, 07:21 AM   #19
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Quote:
Originally Posted by E70M57 View Post
Here is a link to a recent Datazap log from the MHD tune I mentioned above; for comparative reference. Looking at yours it appears that the timing corrections are bit more significant and do not fully clear by the end of the run. Personally, I notice the car runs quite a bit stronger as the timing corrections clear and the ign advance levels across all cylinders. I have been working with E blends and it has taken me to around E45 to achieve this type of limited correction log on the E30 OTS map. Personally...I don't see much concern with your WGDC as you're below 100 and hitting target... but timing drops in the upper RPM range would be something I'd focus on.

https://datazap.me/u/ihickman/log-16...2-4-5-23-37-54
Thank you for taking the time to explain. I’ve spent hours looking up WGDC and it’s *SLOWLY* becoming clearer however I’m not learning how to interpret the timing graphs.

As I mentioned, the log I sent was the first log at E50; a new revision was sent which I’ve yet to flash and log

This is a log at E10 but I’m not sure how to accurately compare the timing as he looks at Corrections whereas yours has Timing per cylinder

https://bootmod3.net/log?id=645c55ccae729b36ece61c96
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      06-01-2023, 08:05 AM   #20
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Not a problem, happy to share my experience on the platform. That log @ E10 shows fairly dramatic corrections throughout the RPM range as well. I personally wouldn't walk away from a custom tune in that situation. Hopefully others will have some more to add to help you through it. It is certainly complex and there is much to learn. I am located in Indiana where we have Shell VPower 93 and plentiful ethanol.... based on what I know about CA fuel you are likely at a bit of a disadvantage there but that should be a consideration of the individual tuning your car.
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      06-01-2023, 08:15 AM   #21
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Quote:
Originally Posted by E70M57 View Post
Not a problem, happy to share my experience on the platform. That log @ E10 shows fairly dramatic corrections throughout the RPM range as well. I personally wouldn't walk away from a custom tune in that situation. Hopefully others will have some more to add to help you through it. It is certainly complex and there is much to learn. I am located in Indiana where we have Shell VPower 93 and plentiful ethanol.... based on what I know about CA fuel you are likely at a bit of a disadvantage there but that should be a consideration of the individual tuning your car.
Well, have no choice but to see through the tune and find the answer to why my logs don’t look as smooth as others I’ve looked up. But as I mentioned before it’s odd to me in that the log doesn’t look clean but the car pulls and feels much better compared to the OTS Stage 2 flex.

About the other thing I can think of is spark plugs and/or coil packs? Would that help clean up the timing graphs? The plugs are a year old, unsure about the coil packs.
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      06-01-2023, 08:30 AM   #22
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For me, plugs and packs did have an impact. I am on stock Delphi coils w/ 17K miles and have swapped to the NGK 97506 gapped @ ~.024. From my initial research most consider that plug a necessity when getting into E blends and higher boost situations. If your packs have over 50K miles I'd consider those as well.
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