(Resolved) Issue getting reliable 23psi

Coupe-R

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Hey CivicX and @KTuner ,

I'm really smashing my head with this one. I am trying to get my tune to be 23psi and actually hit it (and hold) consistently, but it's just not happening. I can not seem to exceed 20 on average, and some of the behavior of boost targets in my data log just don't make any sense.

For example, in this specific data log which logs me doing a test in a near perfect situation:
  • I am at or around sea level,
  • Ambient temperature is around 59 F,
  • On a strip of road that is straight and virtually flat with no incline or decline.
I had the car WOT for about 10-14 seconds straight, and only for a very brief moment (talking milliseconds here) did I see a spike to 21.6 on the MAP (at this point the log said the TC target was only 18.8, even though all the graphs say it should be targeting 23). This occurred at one of the CVTs simulated shifts.

Am I doing something wrong here? Am I not setting the right values for the boost targets/final boost targets/BBG? Ray trace on all the tables points to that I should be getting a target of 23psi, but I never see the target in the logs actually be 23psi, much less see the actual 23 on the MAP. I am attaching screenshots of my tables as well as screenshots of the points in the log depicting what I'm describing. I'll even upload the datalog.

I recently had a full inspection done at my performance shop. This included getting brand new plugs, checking for boost/air leaks with a smoke machine, and much more. I am confident that I have 0 mechanical problems.

Honda Civic 10th gen (Resolved) Issue getting reliable 23psi KC2mEkx


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi ManpAgw


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi NszMBEv


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi 2kZvq5r


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi BOoJRIl


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi EflMV


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi EflMV
 

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Coupe-R

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The fact that your TPS.CMD is not 100 leads me to believe you are exceeding the Cylinder Fill Limitation. Correct that.
Hey @KTuner ,

Thanks for that suggestion, you are right, I am seeing that tps.cmd is around 82 to 90, peaking for just a brief moment to 94ish (though tps does show 100 or 104, if that value matters), even though that entire time I had the pedal to the floor.

So I'm looking at this table, what should I increase the cylinder fill table by? I'm not seeing any real documentation on what this table is doing behind the scenes.

If I'm understanding this correctly, in the log, if the mg/stk on the right is logging as higher than what the values in the cylinder fill table are showing, than I am hitting a bottleneck? Looking at the ray trace in the cylinder fill table, my mg/stk is almost always higher than the value in the table.

So would increasing all of the affected cells in the table to slightly exceed the mg/stk recorded be the proper solution? I'm attaching a screenshot where I circled all the areas where the logged mg/stk exceeded the the table values. Is there any significant risk in doing this to this table? Thanks!

Honda Civic 10th gen (Resolved) Issue getting reliable 23psi QYQBVPf
 
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If mg/stk logged is exceeding the cylinder fill limitation, it will limit you. TPS.CMD not reaching 100 will lower the target boost, since it has a pretty direct relationship to TPS.CMD. You would indeed need to adjust in order for it to allow you to go further.
 
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Coupe-R

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If mg/stk logged is exceeding the cylinder fill limitation, it will limit you. TPS.CMD not reaching 100 will lower the target boost, since it has a pretty direct relationship to TPS.CMD. You would indeed need to adjust in order for it to allow you to go further.
Thanks for that. I'll adjust the cylinder fill limits in the 4 and 8 coulmns by enough to cover the range of mg.stk over the RPM range I am logging. I'll then do the same pull in the same spot I did the first log for consistency.
 


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Coupe-R

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Hey @KTuner

I'm still not having much success in getting up to boost targets. When I'm WOT, I'll barely even hit 20.5psi, with a very brief flash to the occasional 21. I made the adjustments in the cylinder fill limit table as you asked so that all of the affected cells are slightly exceeding what the mg/stk values are in the logs but still no luck.

In my logs I am still seeing the behavior of TPS.CMD not ever hitting 100. I made a graph of TPS.cmd and TPS to see the direct comparison, and on average, my TPS will show 100-103, but TPS.cmd will be on average 80-85. For now I am going to proceed on the assumption that this is my problem with hitting my boost targets. I have attached more screenshots depicting useful information, the most recent datalog from yesterday, as well as the tune file should it be worth looking at.

Honda Civic 10th gen (Resolved) Issue getting reliable 23psi noSfjA1


Honda Civic 10th gen (Resolved) Issue getting reliable 23psi QoxidyZ
 

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Coupe-R

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Feel free to contact support directly through email with additional information.
Sure thing, email sent. Thanks for the help!
 

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@Coupe-R
It's good to see you are trying to self tune. Hope you found a resolution to your issue.
 
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Coupe-R

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@Coupe-R
It's good to see you are trying to self tune. Hope you found a resolution to your issue.
thanks myx, I am working with KTuner on the issue, he thinks it’s software related and is beta testing with me.
 


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Coupe-R

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Resolved.

Just as an FYI in case anybody online comes across this forum post in the future:

The issue was something software related with KTuner. Their support had me test a few beta builds, and after trying a few we found a beta that worked and got the right results (fixing the TPS.CMD issue). I did lose the ability to use cruise control with the beta, and I have to stay on this beta build indefinitely as they cannot release a software to the public that breaks cruise control. For me, I don't really care about CC; so the fix is well worth it. I am happy with the current feature set in this build, so I'm not concerned with missing out on new features in the future.

Shout out to KTuner support for all the help and the really fast responses.
 

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Resolved.

Just as an FYI in case anybody online comes across this forum post in the future:

The issue was something software related with KTuner. Their support had me test a few beta builds, and after trying a few we found a beta that worked and got the right results (fixing the TPS.CMD issue). I did lose the ability to use cruise control with the beta, and I have to stay on this beta build indefinitely as they cannot release a software to the public that breaks cruise control. For me, I don't really care about CC; so the fix is well worth it. I am happy with the current feature set in this build, so I'm not concerned with missing out on new features in the future.

Shout out to KTuner support for all the help and the really fast responses.

Thanks for the update. I was following this because I will be getting more and more into self tuning in the future. At least understanding it much, much more instead of being a complete idiot about some of the maps, etc. So....are you holding at 23psi now? Overshooting a bit and settling at 23psi?
 
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Coupe-R

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Thanks for the update. I was following this because I will be getting more and more into self tuning in the future. At least understanding it much, much more instead of being a complete idiot about some of the maps, etc. So....are you holding at 23psi now? Overshooting a bit and settling at 23psi?
I like understanding everything ad nauseum, so we have that in common!

I didn't originally have this issue with KTuner boost targets around a year or a little shorter ago. I'm assuming it was one of the updates that did it when I re-flashed a tune with the update.

Yes, I hit my 23psi exactly when expected based on my boost targets/final boost target/boost by gear limits I have set. I do slightly overshoot by 1-3 psi, but it is only (emphasize only) for that brief moment when the CVT does it's "simulated" shift at high RPM. I asked KTuner about this and he said it's completely normal and a non-issue.

Unfortunately I did my dyno run before this issue was fixed by about 5 days (had a reservation that was non refundable for that date) so I don't know what I'm actually making now! I plan on going back for 3 more pulls. I expect 10-15 more whp and wtq over the numbers I made (originally 221 and 224 respectively).
 
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The Beta version of TSP Stage 1 (only 1 map right now) for my 2020 Si Sedan will hit and hold at 25.0 PSI in Sport Mode-per TunerViewLite on the head unit :eek::eek::eek: The acceleration is exhilarating, but it may be a bit much (?)

Edward
 

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The Beta version of TSP Stage 1 (only 1 map right now) for my 2020 Si Sedan will hit and hold at 25.0 PSI in Sport Mode-per TunerViewLite on the head unit :eek::eek::eek: The acceleration is exhilarating, but it may be a bit much (?)

Edward
What gives you the indication that 25psi may be a bit much? Intake temps? Exhaust temps? Possible damage to pistons? Transmission (clutch, etc) damage? Something else?
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