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Old 05-27-2015, 04:19 PM   #1
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Default VVT issue

I have messaged a few guys but haven't got a reply yet so hopefully you guys can help me out. I have a vvt motor swapped into 95 miata. Mostly stock only I/H/E

I am having vvt issues where when the vvt connector is plugged in then the car doesn't run properly. It won't idle and runs very rough if I hold at 2000 rpm. On tunerstudio the vvt angle would say 46 ish degrees. When the vvt connector is unplugged then it runs perfectly fine.

settings on vvt are:

no. vvts: 1
frequency: 511hz
on/off or variable (PID): PID
Adjust inj. timing based on: Cam 1
Commanded vs actual: Commanded

test output: off

Cam settings
input: main cam
polarity: falling edge (greyed out)
Output: nitrous 2
min: 270
max: 319
int./exh.: intake
More duty means: advance

Control interval: synced to cam
range check measured angles: yes

PID parameters
use hold duty: off
P:50
I:17
D:130

Could it be settings or mechanical issus? (vvt oil valve/actuator ). I'm trying to bring the car to run properly so I can get it dyno tuned so any help would be great!
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Old 05-27-2015, 05:09 PM   #2
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I am fairly certain that it should not be advancing the intake cam at idle/low loads. First step would be to check your VVT target map and see if that is what is being commanded and then work from there.

A log file is always very useful.
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Old 05-28-2015, 01:06 AM   #3
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I'll try to get the log file soon as it's getting late here and I don't want to wake my neighbours up

This is the map atm
http://postimg.org/image/n8267ynif/
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Old 05-28-2015, 01:52 AM   #4
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Load this map and your problem will go away. Also will improve driveability.

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VVT issue-vvt%2520map%25203_zpsxrn6sz0t.png  
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Old 05-28-2015, 05:11 AM   #5
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hmm I'm getting around 46 for vvt angle and it doesn't go any higher or lower unless the car is shut off. I don't think that vvt map will fix my issue does it?
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Old 05-28-2015, 06:15 AM   #6
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Which MS3 build?
On my MS3 Basic the output is set to "VVT" and I had to perform the test procedure to find my max min absolute values (I'm more non-standard than most though).

More reading on the topic https://www.miataturbo.net/megasquir...0/#post1035918
Read 4.19.2 http://www.msextra.com/doc/pdf/Megas...3.pdf#page=101
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Old 05-28-2015, 05:32 PM   #7
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I'm running ms3 basic so that might be the reason. Will get back to you!
Quote:
Originally Posted by NiklasFalk View Post
Which MS3 build?
On my MS3 Basic the output is set to "VVT" and I had to perform the test procedure to find my max min absolute values (I'm more non-standard than most though).

More reading on the topic https://www.miataturbo.net/megasquir...0/#post1035918
Read 4.19.2 http://www.msextra.com/doc/pdf/Megas...3.pdf#page=101
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Old 05-28-2015, 09:37 PM   #8
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\i have attached my files so crossing fingers someone can get my car running
Attached Files
File Type: msq 2015basemapmiata.msq (177.8 KB, 139 views)
File Type: msl 2015-05-28_17.28.15.msl (78.2 KB, 58 views)
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Old 05-28-2015, 11:54 PM   #9
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im new to this and i went with a PNP pro to support VVT in my 95 so im kinda shooting in the dark looking at what you have posted.
I would start by unplugging the connector for the VVT and seeing if it is getting a 12v then go an disable VVT in your programming and verify that it goes away.
(if you have an oscilloscope you could look for modulation and know that the controller is working properly but this is easier)
the way your log looks to me is that as soon as you are getting oil pressure you are getting max angle so the valve is always on.
Hope this helps if it doesn't sorry
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Old 05-29-2015, 04:34 AM   #10
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Quote:
Originally Posted by abenson100 View Post
im new to this and i went with a PNP pro to support VVT in my 95 so im kinda shooting in the dark looking at what you have posted.
I would start by unplugging the connector for the VVT and seeing if it is getting a 12v then go an disable VVT in your programming and verify that it goes away.
(if you have an oscilloscope you could look for modulation and know that the controller is working properly but this is easier)
the way your log looks to me is that as soon as you are getting oil pressure you are getting max angle so the valve is always on.
Hope this helps if it doesn't sorry
Actually I tried testing it with different methods and with output set to vvt and nitrous 2, even with test duty at 0% and 100%, they all read 14.4v. In fact it still says 14.4v when vvt is turned off. The only time it shows 0v is when car is shut off.

I know my vvt wiring is correct, however I don't know about the 12v because some other guy did half of the swap for me (of course I tried asking and he said he forgot).. Anyway should I just splice that 12v wire and connect it straight to the injector 12v?
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Old 05-29-2015, 09:14 AM   #11
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it sounds like it isnt wired right. i would check you control wire for continuity to ground. it sounds like it broke somewhere and it grounding out.
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Old 05-29-2015, 04:39 PM   #12
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The VVT should always have +12v, if the car is on, as you are observing. The ECU grounds out the signal wire to make the solenoid "go"

As posted above check the signal wire to chassis ground with the car off. It should be open.
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Old 05-29-2015, 05:00 PM   #13
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Also, do you have your flyback diode installed? If I recall it is required for VVT.

My settings:


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VVT issue-screenshot-2015-05-29-15.04.57.png   VVT issue-screenshot-2015-05-29-15.03.42.png  
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Old 05-31-2015, 01:18 PM   #14
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Update: I found out the issue.

The vvt wire was grounded somewhere in the between the connector to ecu.

It has been fixed. Thank you all!
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