Tacoma - OVTUNE - VFTUNER - Update Info and Original Development

Shellshock · Dec 9, 2018

OVTune[OP] said: ↑

It's definitely emissions related but not cold start related.
During cold start up and initial start up the ECU runs -10* of ignition retard to quickly heat the cats.

The ignition tables having so much for idle is because in most cases engines are at idle more than any other rpm, and you can squeeze 0.0001% better efficiency by having overly complex ignition control of idle.

Most other manufacturers have good sized ignition tables for idle...but it is a separate table so they don't have to handicap the rest of the ignition / rpm range in one table.

toyota uses a >Ignition limit MBT table(s)- Base ignition retard table (all reduce from) base high octane 1 I- base high octane 2 - base low octane 1/2-> Throttle angle change retard compensation > valve angle retard - Temperature compensation > Knock correction retard style of logic.

Mazda uses (for example) > MBT Limit table > Ignition depending on Valve timing activation limit on knock, Valve Timing activation limit on MBT, Ignition retard during low load, Transient retard, Knock retard compensation > temperature compensation "if less than" Knock limit > other compensations. (skyactiv)

MZR uses a simpler but very effective strategy > MBT limit tables > Ignition Low Knock Closed loop > high knock closed loop (effectively Low octane base or high octane base) > open loop of the same > Raw knock retard compensation > temperature modifier. and some other stuff.

Subaru.... god subaru uses physics. calculating gravity (lol not really. But subarus ignition is quite complex)

Our ignition fix, which will be explained in detail in our blog, should achieve better MPG than this truck has ever seen before. because we are getting full utilization of advance and increasing cruise advance closer to 40+* where it should be (depending on rpm), unlike stock tables where majority of driving you're lucky to see 30*..

We've tested this with atkinson engine (skyactiv) on Mazda, and on the 2.5L Skyactiv-G engine we achieved 46MPG, and 50+ on the 2.0L.
The only problem is that pre-ignition/ super knock becomes more of an issue with low octane.

I am determined to make 1.05 the "solution" for these trucks. This engine should absolutely be able to get closer to 30mpg.
Even the 2URGSE can do more than 30MPG and it's 5.0L V8, similar design (atkinson, D4-S, high compression)

The 2GR-FKS Camry does 30+.

Realistically I understand with weight and size of the truck we won't see as good but I hope to see more trucks reaching 25+ consistently.
Click to expand...

25+ MPG would be pretty sweet

20tacoma17 · Dec 9, 2018

Shellshock said: ↑

25+ MPG would be pretty sweet
Click to expand...

I'd be happy with anything over 20 on a regular basis.

M1Awolf · Dec 9, 2018

20tacoma17 said: ↑

I'd be happy with anything over 20 on a regular basis.
Click to expand...

I am going to lower the bar even farther,I would be happy with 17. As it is right now with the cold temps and winter fuel this tank is showing 13mpg average and I have been pretty tame on the skinny pedal

speedtre · Dec 9, 2018

catastrofe said: ↑

Oh I know what ISO is, but Sunday is still the first day of the week. Get over it.
Click to expand...

LOL...of course you do...you just googled it.

Shellshock · Dec 9, 2018

20tacoma17 said: ↑

I'd be happy with anything over 20 on a regular basis.
Click to expand...

Ive had that until it got cold and winter fuel came back. Now I’m at like 17-18

Hank_Mille · Dec 9, 2018

Today I towed my toy hauler having a total loaded weight of around 3,800 pounds on mostly flat terrain. Stock 2016 Limited running OV 1.04/91. Granted I'm forced to run corn-infused fuel and to make it worse, it's the Winter blend.

Kept the speed at around 60 MPH with ECT in 4th gear - averaged around 11.5 MPG

dskakie · Dec 9, 2018

M1Awolf said: ↑

I am going to lower the bar even farther,I would be happy with 17. As it is right now with the cold temps and winter fuel this tank is showing 13mpg average and I have been pretty tame on the skinny pedal
Click to expand...

Dude same. I haven’t seen 17 in so long. Not complaining because none of the stuff I’ve done to the truck necessarily help MPG, but still.. 12-14 on my normal drives to work when I’m steady at 65mph and light on the pedal once I’m in town, don’t really get it. Again not complaining because I did it to myself but would love to see and welcome any improvement in MPG!

TRDOBSESSED · Dec 9, 2018

i'm getting 15 mpg in my little access cab with 285's

M1Awolf · Dec 9, 2018

dskakie said: ↑

Dude same. I haven’t seen 17 in so long. Not complaining because none of the stuff I’ve done to the truck necessarily help MPG, but still.. 12-14 on my normal drives to work when I’m steady at 65mph and light on the pedal once I’m in town, don’t really get it. Again not complaining because I did it to myself but would love to see and welcome any improvement in MPG!
Click to expand...

Same boat here, none of my mods,added weight,larger tires have done any favors for mpg's. It also doesn't help that my daily commute is just a little over one mile each way and I don't warm my truck up before hand.

MacMedic · Dec 9, 2018

OVTune is there a link to your blog??

M1Awolf · Dec 9, 2018

MacMedic said: ↑

OVTune is there a link to your blog??
Click to expand...

IIRC he said he posts all of them here on his home page

https://www.ovtuned.com/

tjpratt · Dec 9, 2018

I literally drive mine everywhere like I stole it on 1.04 and get 17mpg.
4" lift and tires.

SpeySquatch · Dec 9, 2018

OVTune[OP] said: ↑

It's definitely emissions related but not cold start related.
During cold start up and initial start up the ECU runs -10* of ignition retard to quickly heat the cats.

The ignition tables having so much for idle is because in most cases engines are at idle more than any other rpm, and you can squeeze 0.0001% better efficiency by having overly complex ignition control of idle.

Most other manufacturers have good sized ignition tables for idle...but it is a separate table so they don't have to handicap the rest of the ignition / rpm range in one table.

toyota uses a >Ignition limit MBT table(s)- Base ignition retard table (all reduce from) base high octane 1 I- base high octane 2 - base low octane 1/2-> Throttle angle change retard compensation > valve angle retard - Temperature compensation > Knock correction retard style of logic.

Mazda uses (for example) > MBT Limit table > Ignition depending on Valve timing activation limit on knock, Valve Timing activation limit on MBT, Ignition retard during low load, Transient retard, Knock retard compensation > temperature compensation "if less than" Knock limit > other compensations. (skyactiv)

MZR uses a simpler but very effective strategy > MBT limit tables > Ignition Low Knock Closed loop > high knock closed loop (effectively Low octane base or high octane base) > open loop of the same > Raw knock retard compensation > temperature modifier. and some other stuff.

Subaru.... god subaru uses physics. calculating gravity (lol not really. But subarus ignition is quite complex)

Our ignition fix, which will be explained in detail in our blog, should achieve better MPG than this truck has ever seen before. because we are getting full utilization of advance and increasing cruise advance closer to 40+* where it should be (depending on rpm), unlike stock tables where majority of driving you're lucky to see 30*..

We've tested this with atkinson engine (skyactiv) on Mazda, and on the 2.5L Skyactiv-G engine we achieved 46MPG, and 50+ on the 2.0L.
The only problem is that pre-ignition/ super knock becomes more of an issue with low octane.

I am determined to make 1.05 the "solution" for these trucks. This engine should absolutely be able to get closer to 30mpg.
Even the 2URGSE can do more than 30MPG and it's 5.0L V8, similar design (atkinson, D4-S, high compression)

The 2GR-FKS Camry does 30+.

Realistically I understand with weight and size of the truck we won't see as good but I hope to see more trucks reaching 25+ consistently.
Click to expand...

Oh man, more mpg with my truck would be amazing

SpeySquatch · Dec 9, 2018

tjpratt said: ↑

I literally drive mine everywhere like I stole it on 1.04 and get 17mpg.
4" lift and tires.

Click to expand...

4” ? What lift?

KkelX4 · Dec 9, 2018

M1Awolf said: ↑

Same boat here, none of my mods,added weight,larger tires have done any favors for mpg's. It also doesn't help that my daily commute is just a little over one mile each way and I don't warm my truck up before hand.
Click to expand...

Even if you did warm it up it wouldn't make your mileage better, you'd just be wasting more gas before you drove a mile.

However I have a solution for you, it's called a bicycle. And it will save you hundreds in gas.

tjpratt · Dec 9, 2018

SpeySquatch said: ↑

4” ? What lift?
Click to expand...

Kind of a concoction. But perfect for me.

Rear:
OME DAKAR full leaf pack
Bilstien 5100's
1" block

Front:
OME 888 Springs
Bilstien 5100's on first notch ((+1"))
Taco lean spacer
Aftermarket UCA's

Front diff and drivetrain spacers

Sits about 3.75" taller than stock in the front and about 4.25" taller than stock in the rear with 275's. Waiting for my leer shell to come in for the rear.

M1Awolf · Dec 9, 2018

KkelX4 said: ↑

Even if you did warm it up it wouldn't make your mileage better, you'd just be wasting more gas before you drove a mile.

However I have a solution for you, it's called a bicycle. And it will save you hundreds in gas.

Click to expand...

The trip to work wouldn't be bad,all down hill,coming home after a long day would be a whole different thing. Only about 4 months out of the year would be tolerable for a bicycle,and even then the wind blows worse than it does in Chicago. That and my 56yo knee's would probably give out...lol

Kclamer · Dec 9, 2018

M1Awolf said: ↑

The trip to work wouldn't be bad,all down hill,coming home after a long day would be a whole different thing. Only about 4 months out of the year would be tolerable for a bicycle,and even then the wind blows worse than it does in Chicago. That and my 56yo knee's would probably give out...lol
Click to expand...

Get one of them electric bicycles and have Mat tune the motor controller for you.

M1Awolf · Dec 9, 2018

Kclamer said: ↑

Get one of them electric bicycles and have Mat tune the motor controller for you.
Click to expand...

It gets kinda cold up here

SpeySquatch · Dec 9, 2018

tjpratt said: ↑

Kind of a concoction. But perfect for me.

Rear:
OME DAKAR full leaf pack
Bilstien 5100's
1" block

Front:
OME 888 Springs
Bilstien 5100's on first notch ((+1"))
Taco lean spacer
Aftermarket UCA's

Front diff and drivetrain spacers

Sits about 3.75" taller than stock in the front and about 4.25" taller than stock in the rear with 275's. Waiting for my leer shell to come in for the rear.
Click to expand...

Oh I see. You are including the tires.

You’re the first person I’ve seen mention drivetrain spacers for the 3rd gen. Glad you like it. Looks good.

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