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ddillenger
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« Reply #30 on: May 27, 2014, 10:23:58 AM »
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The 3rd to last axis value is usually your original pressure ratio. In your case, 1.4 (6psi).
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nyet
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« Reply #31 on: May 27, 2014, 10:43:14 AM »
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The 3rd to last axis value is usually your original pressure ratio. In your case, 1.4 (6psi).
note to self (or you): that needs to be added to the wiki  |
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Ken-1
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« Reply #32 on: May 27, 2014, 11:28:58 AM »
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The 3rd to last axis value is usually your original pressure ratio. In your case, 1.4 (6psi).
Thanks, I used 1.4 to scale the axis. The current base boost is 1.7 absolute so a slight increase. But still, this did not make the engine silky smooth. The problem is still the 16683 code. Is the boost pressure so bad that I should get this fault code and it should go away with fixed tuning or is this code a result maybe from the 3.5 bar MAP? As you see from the plot something is stopping the throttle plate from opening at lower RPM even though the accelerator is pressed fully. And yes, I have modified the max allowed throttle plate angle map. It allows larger values than that. Could be that i got the 16683 code at ready at engine start and it was on during that log. Suggestions what to do? |
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nyet
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« Reply #33 on: May 27, 2014, 11:36:53 AM »
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In that log, your throttle plate looks wide open.
Something else is going on there preventing you from spooling properly, which is causing the code.
Boost leak? Bad wastegate?
Do you get proper spool with the wastegate line disconnected?
I am assuming you fixed the transfer function to properly represent your MAP.
If not, return your MAP sensor to stock.
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Ken-1
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« Reply #34 on: May 27, 2014, 11:45:26 AM »
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Maybe it´s better visible in this log, the throttle plate angle does some funny stuff up to maybe 1800 rpm, after that it goes like normal. I guess that is the fault code doing that, I checked the WG yesterday and it was ok, I will pressure test but I did not get it done today.
The spool is slow with this turbo, but hopefully it will produce some sort of power. Should I lower LDRNX in the lower rev range? I tried that earlier and it did not help so I raised it back up.
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ddillenger
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« Reply #35 on: May 27, 2014, 11:51:59 AM »
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Did you fix the MAP tables?
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nyet
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« Reply #36 on: May 27, 2014, 11:54:10 AM »
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Low rpm throttle plate stuff isn't an issue. With your laggy setup, it simply doesn't matter.
I'd be wary of shifting LDRXN too far up, but if you can make sure your WG stays 100% before peak boost while spooling, you're ok.
I'd maybe look at NDLDRAPI and SDLDRA instead. In particular, if you have a really laggy turbo, NDLDRAPU probably has to be shifted pretty high RPM wise (for the 2.7t anyway).
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Ken-1
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« Reply #37 on: May 27, 2014, 12:09:09 PM »
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Did you fix the MAP tables?
Yep, the scaling and offset of the MAP is now what it should be. So shown boost equals to true boost, about 1.5 bar on gauge. Something strange is going on with the throttle during driving, it's really noticeable and was not there before. I'll look a bit at the mechanical side tomorrow but if I guess it is control related. |
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ddillenger
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« Reply #38 on: May 27, 2014, 12:15:39 PM »
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It sounds like your axis scaling is bad. If you do that wrong it makes for some wonky behavior. Post your new values.
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Ken-1
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« Reply #39 on: May 27, 2014, 12:16:13 PM »
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Low rpm throttle plate stuff isn't an issue. With your laggy setup, it simply doesn't matter.
I'd be wary of shifting LDRXN too far up, but if you can make sure your WG stays 100% before peak boost while spooling, you're ok.
I'd maybe look at NDLDRAPI and SDLDRA instead. In particular, if you have a really laggy turbo, NDLDRAPU probably has to be shifted pretty high RPM wise (for the 2.7t anyway).
I´ll look at these maps, regarding the throttle. You can really feel that the engine is much weaker before the throttle goes open, up to 1800 rpm in the log I was wondering what had happened, after that it started pulling normally. It will maybe not help spool much but power is ridiculously low with throttle plate at ~20 even though pedal is to the floor. |
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Ken-1
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« Reply #40 on: May 27, 2014, 12:20:28 PM »
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It sounds like your axis scaling is bad. If you do that wrong it makes for some wonky behavior. Post your new values.
Yes, THAT is possible. Even likely =) The values I now use are DSLGRAD: 700 hPa/V DSLOFS: 172 hPa As said 3.5 bar MAP, without any data what so ever delivered with it. |
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ddillenger
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« Reply #41 on: May 27, 2014, 12:25:33 PM »
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Not for the MAP, the axis for KFVPDKSD.
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Ken-1
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« Reply #42 on: May 27, 2014, 12:28:46 PM »
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Of course, sorry
Old values New values
0.949465 1.152921786
0.999424 1.213586286
1.049383 1.274250786
1.099342 1.334915286
1.149362 1.395653857
1.199321 1.456318357
1.24928 1.516982857
1.299239 1.577647357
1.349198 1.638311857
1.399218 1.699050429
1.449177 1.759714929
1.499136 1.820379429
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nyet
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« Reply #43 on: May 27, 2014, 01:22:48 PM »
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Yes, THAT is possible. Even likely =)
The values I now use are
DSLGRAD: 700 hPa/V
DSLOFS: 172 hPa
As said 3.5 bar MAP, without any data what so ever delivered with it.
Does it log near 1 bar (i.e. ambient) with motor not running? |
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phila_dot
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« Reply #44 on: May 27, 2014, 02:24:10 PM »
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Of course, sorry
Old values New values
0.949465 1.152921786
0.999424 1.213586286
1.049383 1.274250786
1.099342 1.334915286
1.149362 1.395653857
1.199321 1.456318357
1.24928 1.516982857
1.299239 1.577647357
1.349198 1.638311857
1.399218 1.699050429
1.449177 1.759714929
1.499136 1.820379429
This axis is desired manifold pressure ratio (post throttle). If the map value is greater than 0.95, then the throttle is forced that percentage towards 100%. A value of 1.0 forces the throttle wide open. |
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