VVE Coefficient Calculation Errors, Using Zones To Keep The Calculations Happy

[@abramneufeld1301]

I was running into this a week ago right at 5100-5500 rpms at 175-180kpa map on a 2015 twin turbo camaro, fortunately i was able to upgrade to the 2 bar sd os and that fixed it but wondered if there was a real fix to the vve, as I have a few e67 ecm setups that dont have the 2bar sd upgrade available, very helpful thanks

[@GoatRopeGarage]

That's always my first suggestion if you can get away with running a 2 bar. It's a lot easier to dial in.

[@zdoomcentral]

Thanks! This helped alot! I noticed it was always in certain areas and this narrowed that down.

[@GoatRopeGarage]

Great to hear, John! It's a balancing act at times, but this will help to dial in the trouble sections. Thanks for your support!!

[@zdoomcentral]

@@GoatRopeGarage Of course! I also subscribed to your Patreon. I've been working on learning tuning since I got my Camaro and this series has been a god send. Happy to support!!

[@Pj-zq4bq]

Great videos! Cleared up my confusion with VVE zones. Thanks!

[@harryjohnson2]

This shits off the hook man. Excellent video!

[@kyleguttery9348]

nice work!

[@jaydubb71]

Question... would you tune the ENTIRE VE or VVE table (including WOT) and then run a car in blended mode (setting the dynamic disable to 8192)? Do you think there would be a benefit to this?

[@jaydubb71]

Oh... Im referring to Gen 3 and 4 BTW...

[@GoatRopeGarage]

Yep, you want to tune it independently of dynamic, same with the MAF then bring them back into play that way if one of the sanity checks fail you're good to go

[@jaydubb71]

@@GoatRopeGarage so tune the ENTIRE VE table INCLUDING WOT before switching to blended mode? And set dynamic disable to 8192?

[@renaissanceengineering-lee4210]

So do you just edit the zones like you would edit a VE table naturally based on MAP x RPM? Also, what are the actual table values? I'm used to Holley EFI showing the VE percentages for each cell, but these values are 4 digits. Lastly, is this table the authority for fueling, or will my MAF try to take over even if I make changes on the fly that override this table?

[@GoatRopeGarage]

This is like that but there are some other factors but bigger number is more airflow, just keep that in mind. Try the stock zones, only worry about them if you're running into oddities. When the maf is enabled you're using both, when disabled only this table is active.

[@renaissanceengineering-lee4210]

@@GoatRopeGarage Ahhhh that sort of makes sense! So I'm having a weird issue on my turbo 2.4L with an e67 ecu. I have my stoich set to 13.92 but my LTFT keeps pulling fuel to keep me around 14.50 regardless of manifold pressure. another issue is that when I roll into throttle on low RPM, I build boost quickly and it spikes lean up to 15-16 afr before correcting to my PE afr. I was going to try to use the VE table to add fuel on the low RPM/high boost areas.

[@JimBob-wy7tl]

I just sent you an email about this and zones. Im now wondering if a properly dialed in 3D table is still supposed to look nice an smooth with no spikes/dips. I feel like this will be very time consuming to get this dialed in. Are we leaving any HP on the table if we dont run VVE?

[@GoatRopeGarage]

Probably not, I wouldn't obsess over it, just get it close enough a your MAF is doing all the heavy lifting

[@memobook2010]

Last time i was on my truck i saw it was on dod v4 mode i was wondering how it would work with a mini truck and tune it to be more economic using the v4 mode

[@GoatRopeGarage]

I'm not a fan of DoD. I don't know that it provides enough benefit over a well tuned engine in V8 move to justify running it.

[@aalzahrani181]

Is this step important for tuning cammed 2014 silverado? when I rev up sometime engine stop, Is this will help me?

[@GoatRopeGarage]

That's not what is causing your issues, but this is important on any decently modified 5th gen.

[@aalzahrani181]

@@GoatRopeGarage what do you think about my issue?

[@snipesmc]

What if I just zero out the coefficients table so it doesn't change anything when you hit the button!? Kinda joking but I'm serious!

[@199rocks94]

So basically you want to checkerboard all the zones and make them even?

[@GoatRopeGarage]

That's kind of how I do it, helps the math to start consistent it seems

[@oddball0045]

Whats the advantage of GM doing speed density calculations with these crazy coefficients and zones instead of just a simple rpm/map look up table. I just dont understand why they would reinvent the wheel on something that wasnt broke

[@GoatRopeGarage]

That's a good question... It's about to get even crazier with the global b platform.

[@oddball0045]

@@GoatRopeGarage which is why ill stick to my tried and true 0411 ECUs i can't stand complex over engineered solutions to simple problems

[@bitcanics6892]

We need a video on idle spark coastdown

[@GoatRopeGarage]

What kind of issue are you having?

[@bitcanics6892]

@@GoatRopeGarage just was wondering if there was a graph that could be made and logged and a way to edit or if your just supposed to use your fuel trim graph and set a filter to show only idle

[@GoatRopeGarage]

Guess I'm not understanding what you're trying to do. Are you wanting to log advance on deceleration?

[@bitcanics6892]

@@GoatRopeGarage yes exactly

[@GoatRopeGarage]

You can use your standard spark advance table and set a filter against your acceleration pedal, probably be the easiest way to log advance on deceleration.

[@4BillC]

I don't have a VVE table... Ugh!

[@GoatRopeGarage]

Consider yourself lucky! Overly complicated for us Tuners.

[@davidjr4019]

Way to complicated

[@tonyamendola6589]

This is stupid and futile...just tune for MAF and run MAF all the time...Tuning school even tells you to do it that way in person.

[@GoatRopeGarage]

Tuning school, lol.

[@tonyamendola6589]

@@GoatRopeGarage I agree...I wasnt terribly impressed with the class, but...if you were to provide this method of tuning to customers, you better get very fast and efficent at it, especailly if they're paying you $150-$200 per hour. Just being logistic here. It's nice that EFI LIve actully has a zone overlap function on their VVE editor. Makes dealing with the highs/lows much easier and quciker than interpolating.