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Old 03-13-2017, 11:18 AM   #161
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On that graph, is the -100 the same as 0 and -0 same as 100? Thats a little confusing to me, i want to make sure i am reading it right.

What is the VVT angle showing at idle for those with megasquiret? Mine seems to be higher than expected. VVT request is 3.0 while the actual angle is around 14 as shown in tunerstudio.
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Old 03-13-2017, 12:38 PM   #162
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Quote:
Originally Posted by mmmjesse View Post
On that graph, is the -100 the same as 0 and -0 same as 100? Thats a little confusing to me, i want to make sure i am reading it right.

What is the VVT angle showing at idle for those with megasquiret? Mine seems to be higher than expected. VVT request is 3.0 while the actual angle is around 14 as shown in tunerstudio.

0kpa is full load/WOT anything below that is vacuum
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Old 04-21-2017, 01:57 PM   #163
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What Tunerstudio parameter do I monitor to determine the min/max cam angles when I change the duty cycle from 0 to 100%? I have VVT_ang1 (to monitor actual cam advance) and VVT_target1 (to monitor the requested cam angle), but both of these are relative values, showing just the amount of advance.
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Old 04-29-2017, 02:54 AM   #164
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Gunna read more of this thread
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Old 04-29-2017, 09:18 AM   #165
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Quote:
Originally Posted by nismo240 View Post
What Tunerstudio parameter do I monitor to determine the min/max cam angles when I change the duty cycle from 0 to 100%? I have VVT_ang1 (to monitor actual cam advance) and VVT_target1 (to monitor the requested cam angle), but both of these are relative values, showing just the amount of advance.

Set min/max values to zero, then use the test mode. The VVT angle gauge will show the actual angles for 0 and 100 duty cycle. Write those numbers down, and use as your min/max values.

4.19.2 (pg102): http://www.msextra.com/doc/pdf/Megas...ing_Up-1.3.pdf
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Old 05-01-2017, 11:54 AM   #166
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Ok, guys... need a little advice on my VVT tuning.

Stock '01 motor in NA chassis, except for the intake tube and filter, and the exhaust from the stock downpipe back. MS3/MS3X, idle control on IDLE, fan control on FIDLE, and VVT on NITROUS 1. Also, I live at 5000ft, so atmospheric pressure is ~ 81kPa.

VVT settings:


VVT table:




The issue I'm having is instability in the VVT angle, sometimes on the upslope, but more often on the downslope. Sometimes it will spike after an advance event when no advance is called for. I've played with the PID settings quite a bit, and the behavior seems to be best where they are in the settings above.

Example of upslope instability:



And on the downslope:






The last one concerns me the most, since it's showing a big spike where no advance is commanded.

I'm a total newb to this tuning thing, but even after spending endless hours reading the manuals and threads I'm afraid I've missed something simple... I attached log and tune files.

Anyone have an idea what changes to try?
Attached Files
File Type: msl 2017-04-29_09.48.45.msl (2.70 MB, 5 views)
File Type: msq 100kpa tables VVT 042917.msq (249.4 KB, 4 views)

Last edited by Roda; 05-01-2017 at 01:38 PM.
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Old 05-01-2017, 12:47 PM   #167
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Ps, none of the pictures work. Yo need to link to the "Direct" link, it can be found on the right within photobucket.
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Old 05-01-2017, 01:39 PM   #168
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Quote:
Originally Posted by Ivan View Post
Ps, none of the pictures work. Yo need to link to the "Direct" link, it can be found on the right within photobucket.
OK, I've never had an issue before, but I edited the post... Are you seeing them now? I can't tell a difference because they were working for me before...
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Old 05-01-2017, 01:40 PM   #169
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Quote:
Originally Posted by Roda View Post
OK, I've never had an issue before, but I edited the post... Are you seeing them now? I can't tell a difference because they were working for me before...
The're working now.
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Old 05-01-2017, 06:50 PM   #170
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Roda stupid question but was the oil up to operating temperature? I believe I have noticed in my data logs that engine temp is playing a role in target/command discrepancies.

Otherwise it's closed-loop tuning as far as my limited knowledge of the subject.
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Old 05-01-2017, 07:47 PM   #171
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I have the minimum temp for VVT set to 140*. This particular log should be normal operating temps. I'd look at the log, but I'm at work and don't have access to MLV here. I had not noticed any correlation to temperature while tuning, but I wasn't really looking as it was always in the 180* range.
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Old 05-01-2017, 08:10 PM   #172
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Try to make it more linear. VVT has a certain window of operation and going from basically 0 to 40 can and will cause loss of power. Try to set your 2700 rpm column to 25 degrees.
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