!nfern0
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Audi TT 1.8T BAM
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« on: October 23, 2014, 08:16:20 AM »
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Hi,
I'm wondering when the actual boost pressure should meet the desired boost pressure?
According to Audi, full torque should be there at about 2200 1/min in this engine. I know that some manufacturers try to make their car data look better than it really is...
So... with my stock file (everything else is also stock) pvdks meets pssol_w at about 3000 1/min... in some logs a bit earlier...
Unfortunately I don't have experience with similar engines. Can someone tell me if this is normal, or does my wastegate need some adjustement?
Attached a screenshot of a 4th gear WOT log.
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nyet
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« Reply #1 on: October 23, 2014, 09:02:04 AM »
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Probably fine.
Next time post the complete log, including wastegate dc.
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!nfern0
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« Reply #2 on: October 23, 2014, 09:09:39 AM »
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Many thanks!
Sorry, the log file is too large... more than 30mb.
Is there an opportunity to make the file smaller with ecuxplot?
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nyet
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« Reply #3 on: October 23, 2014, 09:15:05 AM »
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Many thanks!
Sorry, the log file is too large... more than 30mb.
Is there an opportunity to make the file smaller with ecuxplot?
Not easily.. you can hand edit it if you are careful though (and good with a text editor). Interesting idea for a feature though... In the mean time, can you add wgdc to the graph you posted? |
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!nfern0
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Audi TT 1.8T BAM
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« Reply #4 on: October 23, 2014, 09:25:43 AM »
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Ok... I was able to do it manually.  Now you can take a look at all my logged values.  |
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phila_dot
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« Reply #5 on: October 23, 2014, 02:03:53 PM »
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pssol_w is not the setpoint, plsol is.
pssol_w is desired modelled manifold pressure (post throttle)
plsol is target boost pressure (pre-throttle)
They should be identical however when the throttle is wide open (100%).
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nyet
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« Reply #6 on: October 23, 2014, 02:19:43 PM »
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Looks fine to me.
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!nfern0
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« Reply #7 on: October 24, 2014, 06:55:56 AM »
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Thank you both.
Since it seems that stock is ok, the next step for me will be to increase LDRXN to get more boost pressure.
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!nfern0
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« Reply #8 on: October 26, 2014, 06:29:41 AM »
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Hi!
I'm struggling with increasing boost above 4000 RPM. Increasing LDRXN in this area has no effect in this area. See screenshot...
Is there something else limiting? In my opinion KFLDHBN isn't limiting.
I added three log files:
1. Stock file.
2. First tune -> Increased LDRXN to max. 160. decreased LAMFA to 0.9.
3. Second tune -> Increased LDRXN to max. 172. LAMFA stayed 0.9 since temperetares were nice.
I don't see a real difference between the two last logs in actual boost pressure.
Thank you in advance for any input.
PS: Could it be that the exhaust system is already limiting? Or maybe some other "hardware"?
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!nfern0
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« Reply #9 on: October 26, 2014, 06:30:35 AM »
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Screenshot:
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nyet
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« Reply #10 on: October 26, 2014, 04:32:03 PM »
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Hi!
I'm struggling with increasing boost above 4000 RPM. Increasing LDRXN in this area has no effect in this area. See screenshot...
Is there something else limiting? In my opinion KFLDHBN isn't limiting.
What makes you say this? Graph ChargeLimitTurboProtection vs EngineLoadCorrected  |
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!nfern0
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« Reply #11 on: October 27, 2014, 01:47:19 PM »
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What makes you say this? Graph ChargeLimitTurboProtection vs EngineLoadCorrected That's why I said this. engine load is not reaching that limit... and since exhaust mass flow isn't getting higher than 165...170 g/s in every three logs... i think the catalyst is limiting... This limiting is also nice to see if you take a look at the WGDC - the boost pressure regulator is trying to decrease LDE by higher duty cycle (from stock to 160 to 172 LDRXN), but boost isn't increasing. I didn't say why I think like this to have no influence on your opinion... But maybe I'm off track. Please correct me, if there is another "limiter" i don't see... |
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nyet
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« Reply #12 on: October 27, 2014, 02:01:53 PM »
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That's why I said this. engine load is not reaching that limit...
Don't confuse actual (rl) with requested (rlsol/rlmax) rlmax is definitely being capped by ldrlms rl, in this case, is entirely irrelevant. Requested load is entirely feed forward if there is no torque intervention. This limiting is also nice to see if you take a look at the WGDC - the boost pressure regulator is trying to decrease LDE by higher duty cycle (from stock to 160 to 172 LDRXN), but boost isn't increasing.
Totally disagree. |
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« Last Edit: October 27, 2014, 02:05:13 PM by nyet »
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!nfern0
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« Reply #13 on: October 27, 2014, 02:14:49 PM »
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Now I'm really confused!  rl is capped by ldrlms... this you can easily see in the log... at about 3000...3500 rpm... but rdrlts isn't limiting... what's KFLDHBN in my opinion... that's a minor problem at the moment... the main problem is at higher RPM's... here the LDR tries to increase boost with WGDC but boost isn't increasing, although i don't see any map which is limiting. -> so it's the catalyst(?)! |
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nyet
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« Reply #14 on: October 27, 2014, 03:50:53 PM »
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rl is capped by ldrlms... this you can easily see in the log... at about 3000...3500 rpm...
I'm seeing no such thing. ONE MORE TIME: ldrlms/ldrlts DO NOT CAP RL, they cap rlmaxbut rdrlts isn't limiting... what's KFLDHBN in my opinion...
I had a typo in my post. I mean ldrlts, not ldrms. One more time: look at your log: ldrlts is limiting rlmax the main problem is at higher RPM's... here the LDR tries to increase boost with WGDC but boost isn't increasing
I'm not seeing that in the last .csv you posted. |
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