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Old 10-21-2016, 02:22 PM   #15
thatspsychotic
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Quote:
Originally Posted by damagi123 View Post
im having the same problem WOT on 3rd or 4th from 2500 - 3500 RPM
im on stg2 2.3b and it wasnt happening at first only after a couple weeks.

im also going to test boost leak and n75 but also what about pcv?
I replaced my PCV plate after going V2.1, and it didn't really seem to help the issue.

I've found that in really hot weather I get much more of a compressor surge sound, but in cooler weather it is much more boost fluctuation.

To me, this has to be either N75, or the tune. I really don't trust how the APR tune adapts. It seems to be it feels great when first flashed, but it develops maladaptations over time. It seems like it almost gets tired of using the N75 for boost control and starts using the DV and throttle plate instead. Pretty strange strategy.

Any non-APR folks have issues similar to this?
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Old 11-01-2016, 04:56 PM   #16
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Quote:
Originally Posted by thatspsychotic View Post
I replaced my PCV plate after going V2.1, and it didn't really seem to help the issue.

I've found that in really hot weather I get much more of a compressor surge sound, but in cooler weather it is much more boost fluctuation.

To me, this has to be either N75, or the tune. I really don't trust how the APR tune adapts. It seems to be it feels great when first flashed, but it develops maladaptations over time. It seems like it almost gets tired of using the N75 for boost control and starts using the DV and throttle plate instead. Pretty strange strategy.

Any non-APR folks have issues similar to this?
I'm GIAC Stage 2 tuned and started getting Boost fluctuations after a hard track day (road course) this past August. I chased for boost leaks and found nothing. Bought a new OEM n75 valve and replaced it two days ago with no other changes. Problem solved for me. No more fluctuations or hesitations.
I will say that replacing this little valve was a royal PITA Very little space around it. I highly recommend very long needle nose pliers. Maybe even long angled needle nose pliers. Also, upgrading to the USP turbo delete could make the job easier as well. (I kinda wish I did this.) I had to remove my turbo muffler in order to get my hands in there.

Other statistics:
53k miles
Chipped/Tuned for 40k+
Pump (91oct) and Race file did not change hesitation issue
Still on original PCV
ECS CatchCan for about 10k miles
old n75 had oil in it. (Similar to DV)
no check engine light or error codes (I have VAG-COM)
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Last edited by Blaznjoe; 11-02-2016 at 08:54 PM. Reason: Moar deets
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Old 11-02-2016, 05:31 PM   #17
thatspsychotic
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Quote:
Originally Posted by Blaznjoe View Post
I'm GIAC Stage 2 tuned and started getting Boost fluctuations after a hard track day (road course) this past August. I chased for boost leaks and found nothing. Bought a new OEM n75 valve and replaced it two days ago with no other changes. Problem solved for me. No more fluctuations or hesitations.
I will say that replacing this little valve was a royal PITA Very little space around it. I highly recommend very long needle nose pliers. Maybe even long angled needle nose pliers. Also, upgrading to the USP turbo delete could make the job easier as well. (I kinda wish I did this.) I had to remove my turbo muffler in order to get my hands in there.

Other statistics:
53k miles
Chipped/Tuned for 40k+
Pump and Race file did not change hesitation issue
Still on original PCV
ECS CatchCan for about 10k miles
old n75 had oil in it. (Similar to DV)
Thanks for the feedback. I'm considering having the dealer replace it for that reason... I wonder how much labor they'd charge. I'm pretty sure this is the culprit for what I'm experiencing. Shame that such a cheap part is such a PITA to replace.
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Old 10-16-2017, 08:16 PM   #18
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Any update OP? I'm experiencing the exact same boost fluctuation issue with APR Stage1 v2.4 file. No codes, new rev D DV, new N75 valve, no improvement.
Starting to run out of ideas.
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Old 10-16-2017, 09:44 PM   #19
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Quote:
Originally Posted by Ronnie_B View Post
Any update OP? I'm experiencing the exact same boost fluctuation issue with APR Stage1 v2.4 file. No codes, new rev D DV, new N75 valve, no improvement.
Starting to run out of ideas.
Perhaps it's just in the software itself? Not a knock on the APR, but I've seen a lot of complaints about the new software since it came out, however I can't say I keep up with it either to say it it was resolved or not. I wouldn't just throw parts at it though. Unless you can flash back to stock I'm not sure how to say for certainty if it is or is not the software. You have any places close by that are not APR that might be weilling to flash their software to check it? Perhaps the APR dealer where you got your work done will flash it back to stock or stage 1 t o help diagnose the problem?
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Old 10-16-2017, 09:56 PM   #20
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Quote:
Originally Posted by FriggenT View Post
Perhaps it's just in the software itself? Not a knock on the APR, but I've seen a lot of complaints about the new software since it came out, however I can't say I keep up with it either to say it it was resolved or not. I wouldn't just throw parts at it though. Unless you can flash back to stock I'm not sure how to say for certainty if it is or is not the software. You have any places close by that are not APR that might be weilling to flash their software to check it? Perhaps the APR dealer where you got your work done will flash it back to stock or stage 1 t o help diagnose the problem?
I flashed back to stock earlier today, no boost fluctuation issues...so it's definitely in the APR software. After looking at the N75 duty cycle in the logs, the gain on the PID Loop is set too high, causing the boost to overshoot and oscillate as it tries to meet setpoint. This is definitely software related.
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Old 10-16-2017, 10:58 PM   #21
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Quote:
Originally Posted by Ronnie_B View Post
I flashed back to stock earlier today, no boost fluctuation issues...so it's definitely in the APR software. After looking at the N75 duty cycle in the logs, the gain on the PID Loop is set too high, causing the boost to overshoot and oscillate as it tries to meet setpoint. This is definitely software related.
Have you contacted APR ?
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Old 10-18-2017, 06:25 PM   #22
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Quote:
Originally Posted by FriggenT View Post
Have you contacted APR ?
Yes, I've been told they would get back to me in 3 weeks. Unfortunately, I have a track event at VIR scheduled in 2 weeks. So that may end up being a waste with these APR tune issues.
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Old 10-18-2017, 07:01 PM   #23
Erick666
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I've had a similar problem. Turned out to be a faulty rev D DV. Switched back to the rev C I originally had in the car and it seemed to fix the issue. When I pulled the rev D out, it didn't come out in one piece (the cage portion was easily separating from the rest of the DV). I assume it was leaking, being that it was loose enough to come apart like that, causing the pulsing.
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Old 10-18-2017, 10:18 PM   #24
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Boost fluctuations and hesitation: APR Stage 1

Quote:
Originally Posted by Blaznjoe View Post
I'm GIAC Stage 2 tuned and started getting Boost fluctuations after a hard track day (road course) this past August. I chased for boost leaks and found nothing. Bought a new OEM n75 valve and replaced it two days ago with no other changes. Problem solved for me. No more fluctuations or hesitations.
I will say that replacing this little valve was a royal PITA Very little space around it. I highly recommend very long needle nose pliers. Maybe even long angled needle nose pliers. Also, upgrading to the USP turbo delete could make the job easier as well. (I kinda wish I did this.) I had to remove my turbo muffler in order to get my hands in there.

Other statistics:
53k miles
Chipped/Tuned for 40k+
Pump (91oct) and Race file did not change hesitation issue
Still on original PCV
ECS CatchCan for about 10k miles
old n75 had oil in it. (Similar to DV)
no check engine light or error codes (I have VAG-COM)


Sorry i know this is an old post, but also stage 2 GIAC and getting and getting the exact same issues. Been chasing it for months back and forth to my tuner shop. Boost leak free, new stock DV, turbo muffler delete, among basic bolt on mods and getting the oscillations. Similar to the video that was shared but worse. Iíve been wondering if the n75 has been the culprit? My shop has done many logs a dyno day and still think it could be software related. Race file doesnít fix my issue either. Only problem now is that his dyno is down for a while for some part and wonít be able to get all the logs done. Almost tempted to just buy a new n75 and see what happens.

To the APR people having this issue, at least you guys arenít alone whether itís software or a hardware related issue. Iíve been dealing with mine for ever it seems and am exhausted by it. Car is not even fun to drive past 3rd gear.

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Old 10-18-2017, 10:52 PM   #25
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Quote:
Originally Posted by hbrown0509 View Post
Sorry i know this is an old post, but also stage 2 GIAC and getting and getting the exact same issues. Been chasing it for months back and forth to my tuner shop. Boost leak free, new stock DV, turbo muffler delete, among basic bolt on mods and getting the oscillations. Similar to the video that was shared but worse. I’ve been wondering if the n75 has been the culprit? My shop has done many logs a dyno day and still think it could be software related. Race file doesn’t fix my issue either. Only problem now is that his dyno is down for a while for some part and won’t be able to get all the logs done. Almost tempted to just buy a new n75 and see what happens.

To the APR people having this issue, at least you guys aren’t alone whether it’s software or a hardware related issue. I’ve been dealing with mine for ever it seems and am exhausted by it. Car is not even fun to drive past 3rd gear.

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I'm surprised giac has not done better to solve the problem, but I know they do revisions and can adjust the tune.

The n75 is not an easy part to swap out.

Honestly, the ihi turbos have had wastegate flap issues, where the cleavis pin (i believe that's what it's called) causes the flap to rattle and even cause boost issues. If I were to check anything, I think I would do that next, simply because you can just unbolt the DP, move it to the side, and check that flap. If the flap opens, the ecu will sense it, thus compensate for it, which could POSSIBLY cause your issue.

See the end of this video (although it's only 1:30 or so)
https://youtu.be/Cl4AuMc8zfg
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Old 10-20-2017, 11:51 AM   #26
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This is Great information, ive been struggling with this issue for awhile now.
At first the APR update seem to fix it, after a few months the issue was back.
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Old 10-28-2017, 06:16 PM   #27
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Quote:
Originally Posted by FriggenT View Post
I'm surprised giac has not done better to solve the problem, but I know they do revisions and can adjust the tune.

The n75 is not an easy part to swap out.

Honestly, the ihi turbos have had wastegate flap issues, where the cleavis pin (i believe that's what it's called) causes the flap to rattle and even cause boost issues. If I were to check anything, I think I would do that next, simply because you can just unbolt the DP, move it to the side, and check that flap. If the flap opens, the ecu will sense it, thus compensate for it, which could POSSIBLY cause your issue.

See the end of this video (although it's only 1:30 or so)
https://youtu.be/Cl4AuMc8zfg


Hey sorry for the late response but thanks for the informative feedback. The weird thing is I donít get any fault codes or underboost codes/go into limp mode. Yeah I donít understand how itís been this difficult of a diagnosis. Theyíve gotten so many logs you think they would have found the issue. Still on the holding pattern from the shop since his Mustang AWD dyno is down. He prefers this route for logging since the area the shop is at doesnít have many spots to do third and fourth gear pulls. I did ask about the wastegate and was told there isnít any play in the shaft. Honestly the car hasnít been fun at all to drive this year and making me hate it. If I had the coin Iíd try another tune but thatís kind of a dumb decision if itís just something GIAC can revise in my tune.


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Old 11-05-2017, 07:35 PM   #28
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[quote=FriggenT;2555127]

Honestly, the ihi turbos have had wastegate flap issues, where the cleavis pin (i believe that's what it's called) causes the flap to rattle and even cause boost issues. If I were to check anything, I think I would do that next, simply because you can just unbolt the DP, move it to the side, and check that flap. If the flap opens, the ecu will sense it, thus compensate for it, which could POSSIBLY cause your issue. [\QUOTE]



Does the DP have to be unbolted to check the WGA?


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