NefMoto > Technical > Tuning > Issue with boost request
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Author Topic: Issue with boost request  (Read 14068 times)
em.Euro.R18
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« Reply #15 on: February 13, 2014, 02:04:48 PM »


Same boost curve as chart posted before. Sorry I was working on it wasn't sure if some of you preferred posting up the log.
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phila_dot
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« Reply #16 on: February 13, 2014, 04:42:50 PM »
Actual boost pressure still isn't meeting requested?

Have you confirmed that there are no mechanical problems?

Correcting this would be my first priority.

Original turbos and stock boost PID?

Rlsol_w isn't being limited by rlmax_w, so that's clearly not the issue with low target boost pressure. Is rlsol_w following KFMIRL? If not, then the torque request is too low possibly from torque intervention or something else within the torque model (possibly KFMIOP).

As I said, I would concentrate on getting actual to meet target first.
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em.Euro.R18
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« Reply #17 on: February 13, 2014, 09:53:39 PM »


Well here is IOP and IRL.  IRL is stock. Thinking back on I remember scaling up IRL and IOP. Ddillenger suggested keeping IRL stock and I never changed IOP back to stock. I think that maybe where the intervention is coming from. So in IOP I added 5-7% torque and rescaled the load axis. I'll go back to the stock IOP values but keep the load axis and go from there.
« Last Edit: February 13, 2014, 10:19:41 PM by em.Euro.R18 » Logged
phila_dot
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« Reply #18 on: February 14, 2014, 07:39:02 AM »
Torque request is fine, look at KFMIRL and rlsol_w.
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em.Euro.R18
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« Reply #19 on: February 14, 2014, 08:17:29 AM »
I see that rlsol_w is slightly lower then IRL. So that would indicate torque intervention taking place. I will revert back to stock IOP and keep the axis the same. Since I changed IOP's load axis how can you re-interpolate kfwzop/kfmds? I was hoping I didn't have to do this.
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phila_dot
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« Reply #20 on: February 14, 2014, 08:29:50 AM »
It's not lower, you're not going to be fully in the 99% column.

Look at your KFMIOP, your highest max torque request is ~85%.
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em.Euro.R18
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« Reply #21 on: February 14, 2014, 08:59:17 AM »
 Shocked Now I'm understanding this relationship. I've been under the impression IOP was simply just used in the internal torque calculation but its also used as a cap for IRL. Tapp has all the IOP/IRL maps maxed out so I'm not used to working with stock, I believe he also underscales mafs to prevent intervention (you should see what KFLF looks like in some of the files). So I'll either have to max last column in IOP or rescale the axis to peak IRL(which is probably what I'll do then rlsol_w will be closer to 180% request.

So plsol is being capped by IOP. I also have to pressure test the system. Thanks for your help phila_dot
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em.Euro.R18
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« Reply #22 on: February 26, 2014, 11:35:58 AM »
Just to update this thread and bring it all together for future reference of other members on here. I took a log of n75 duty cycle which ended up being pegged at IMX 94.9%. In conclusion that would  point me to either a clocked up solenoid or boost leak (pressure tested charge system nothing obvious). So we will swap the n75 valve out and go from there.

I still am not sure why the boost request be stuck at 2110, because hbn is still high.
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nyet
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« Reply #23 on: February 26, 2014, 11:51:23 AM »
Quote from: em.Euro.R18 on February 14, 2014, 08:59:17 AM
you should see what KFLF looks like in some of the files

If you want to avoid ps_w limits, underscale + KFLF hacks are unavoidable w/o using the 5120 hack.

http://nefariousmotorsports.com/forum/index.php?topic=2747.0
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em.Euro.R18
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« Reply #24 on: February 28, 2014, 11:51:18 AM »
Wow that makes perfect sense now why he would do that. It's no wonder using maestro made my head spin. Using his base file for v8 s4 maf stage 3 files where seeing such low actual engine loads(I've tuned around 5 different cars all with that problem on maestro), when I would try and rescale the maf instead of using his klaf(reverted to stock) I'd start experience intervention. I would keep backtracking and end up just end up right whre I started. It would have been great if he would have told me the maf was underscaled for that purpose instead of making the customer feel as though they were idiots.
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