VVT setup and test procedure - help please - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 04-13-2014, 04:19 AM   #1
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Question VVT setup and test procedure - help please

Hi,

as I got my VVT swapped 96 Euro-MX-5 up and running I want to make sure now, that I get the best out of the VVT.

I found various threads on the VVT subject with various very different VVT tables. Also I did found that it is important to set up the dutys and angles correctly - but I found nothing on how to do that.

My logs when driving yesterday show a maximum VVT angle of 40 (target was higher but the actual VVT angle always stopped at 40)

Can someone please give my a nice (and VVT noob friendly) "How to set your VVT up correcty for the first time" ?

I would really appreciate your help!
Thanks!
Zaphod is offline   Reply With Quote
Old 04-14-2014, 03:22 AM   #2
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Nobody done this before?
Zaphod is offline   Reply With Quote
Old 04-14-2014, 10:20 AM   #3
Junior Member
 
Join Date: Feb 2012
Location: Johnson City, Tn
Posts: 70
Total Cats: 1
Default

Funny because I am looking for the exact same thing. If I find something I will pass it your way, I would appreciate the same.
theemike is offline   Reply With Quote
Old 04-14-2014, 10:38 AM   #4
Junior Member
 
Join Date: Feb 2012
Location: Johnson City, Tn
Posts: 70
Total Cats: 1
Default

I assume that you have found (and read) https://www.miataturbo.net/megasquir...-tuning-64590/

That is where I think I will gain the best info, folks like Emilio, Rev, Matt, Y8s and other people vastly more versed on this than I ever will be are all over the topic.
theemike is offline   Reply With Quote
Old 04-15-2014, 03:38 AM   #5
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Of course I have seen this thread - but I haven't found out how to test/evaluate the base settings:

I read that CAM minimum and maximum are important...

-- Cam Settings --
CAM1
Input: Main cam
Output: Nitrous2
Minimum: 275.0
Maximum: 319.0
-How do I find this settings?
int.exh.: Intake

Dutys:
I had a look at a log I took with the car, my Minimum VVT duty was 22% and the VVT is reaching the maximum angle at a duty of ~80% - so should I use these as the minimum and maximum dutys?

like
Minimum VVT duty (%) 20
Maximum VVT duty (%) 85

or something like this? I guess that would make it easier for the PID to follow the target - though I am quite happy how close to the target it is...

I would really appreciate some input on that... Thanks!
Zaphod is offline   Reply With Quote
Old 04-15-2014, 03:56 PM   #6
Junior Member
iTrader: (2)
 
Join Date: Dec 2012
Location: Los Angeles, CA
Posts: 107
Total Cats: 11
Default

If I remember correctly, this is how I got my min and max angles.
Go into test mode under the vvt settings tab. Set duty cycle to 0 while engine is at idle. Note cam angle under the gauge cluster. This is your min. Now, rev the engine to 3000 so it doesn't stall out and set duty cycle to max. Note cam angle, this is your max. I ended up with 277.3 min and 323.3 for max. I confirmed this by setting vvt advance to 0 in the vvt map and sure enough, vvt angle held a solid 0 at idle. Reved engine to a set rpm, and the vvt angle matched exactly what was set in the vvt map. If this is incorrect, I'd love to hear the correct method, but so far this has gotten me perfect vvt cam angles.
If it matters for you, PID settings are 50,8,80.
ryanr is offline   Reply With Quote
Old 05-23-2014, 09:38 AM   #7
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

O.K. I checked this out yesterday - the test showed a min. of 0 deg. and a max of ~39 deg. VVT angle.

But what about the Minimum and Maximum abs. deg. - how do I find these out? It's at 275 and 315 now for me - (which equals 40 range)
Zaphod is offline   Reply With Quote
Old 06-22-2015, 01:00 PM   #8
Junior Member
 
Join Date: Oct 2012
Posts: 138
Total Cats: 4
Default

Quote:
Originally Posted by Zaphod View Post
O.K. I checked this out yesterday - the test showed a min. of 0 deg. and a max of ~39 deg. VVT angle.

But what about the Minimum and Maximum abs. deg. - how do I find these out? It's at 275 and 315 now for me - (which equals 40 range)
You use test mode and force the VVT duty cycle to 0 to find the minimum absolute angle (create a gauge on your Tunerstudio dash to see/read VVT angle). Then using test mode increase duty cycle until the cam stops advancing, which will provide both your max VVT angle (gauge on Tunerstudio dashboard) and max VVT duty cycle %. If you decrease the duty cycle back to zero and slowly increase the %, while observing the actual VVT angle gauge, the minimum duty cycle should be the % when the VVT angle just starts to increase.

Note that you should try setting the minimum duty cycle just under the actual % when the VVT angle starts to move. VVT operation changes with oil team/pressure/viscosity, so this way you help ensure that the MS will actually be able to leave the VVT angle at the fully retarded position. I am going to try this with my MS3, as sometimes I get some bouncing of the actual VVT angle around the minimum by a few degrees, even with no advance at that point in the VVT angle map. Try it for yourself and see if it makes a difference.
noname4me is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM


Tags
setup, vvt

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:57 AM.