I'm getting close to starting up my VVT swap for the first time. Does anyone have a good MAP for the VVT duty cycle they could share for an NA setup?

 

I'll pull out my laptop and shoot one over to you shortly.

 

This is the requested degree for closed loop. Here are a couple of options for you. But generally speaking there isn't much that goes into VVT tuning between a boosted setup vs NA. Most tuners find that the same settings seem to work great for both.

 

Have you actually used either of those maps? I've actually tuned a full-power N/A VVT target table, and it looks nothing like either of the maps you've posted. I suspect both of those maps will also cause low-speed driveability issues, since you have requested significant amounts of cam advance at low vacuum (including in overrun).

 

Midtenn, this thread has all the info you want.

the thread where Savington asks a lot of really, really dumb questions. - Miata Turbo Forum - Turbo Kitten is watching you test compression.

My final settings are in post 133. Most of the settings are the same between Series 1 and EMS-4, but a few important ones are different. You'll need to tweak some stuff based on how many teeth your trigger wheel has and how you want the target advance map to display things. For the EMS-4, you'll need to invert the VVC#1 error table if you want to use the Series 1 target maps (47 = full retard, 0 = full advance), or you'll want to invert the VVC#1 output if you want to go the other way (0=full retard, 47 = full advance). I typically just invert the error table and use 47 as full retard.

For the base duty table, every car is a little different, but 30% should get you in the ballpark. If you find that the car isn't hitting VVC targets or if it's constantly drifting back towards full retard, you may need to raise it a few percent across the board.

If you're using our 12+1 trigger wheel, shoot me a PM and I'll provide some more detailed settings specific to the EMS-4 and our wheel. It's worth mentioning that my EMS-4 PnP basemaps have all of this stuff set up properly out of the box

 

One of those is actually a map from a customer claiming you were the one who tuned it. The other is mine which produces great low end power and near factory drivability. I'm glad at some point you spent some time on a dyno and sorted things out though.

 

That's interesting, since as I said above, my VVT settings are set up so that 47* is full retard and 0* is full advance. I've never done it any other way. Your customer must be mistaken

 

Also lol @ Load in PSI.

 

Different strokes for different folks. My brain works in KPAa/Fahrenheit/gasoline AFR, so that's how I tune. Some people like PSIg/Centigrade/Lambda. The Japanese like their KG/CM^2 gauges which are almost BAR but not quite. I met a tuner this week at AEM while I was getting factory training on the new Infinity EMS systems who says he prefers everything in BAR and lambda.

Tomayto, tomahto.

 

Entirely possible.

 

Devin Pierce?

 

I was under the impression that for a turbo with VVT gains could be made having more variation in your map for a given rev and load. using the overlap and lack there of to increase turbo efficiency.

 

Anyone have a non-vvt basemap

 

If you don't have VVT, you won't need to populate VVT solenoid duty cycles

 

No, but as stated, i do need a non vvt basemap for ems4..

 

But this thread is about vvt duty cycle map. Can always ask the vendor you bought your EMS from. Thats some easy support, shouldn't be too difficult.

 

Alternatively you can just interpolate timing and VE tables from a megasquirt basemap which is readily available. Just have to adjust your trigger inputs to your setup. Then have your tuner make it right.