VF Tuner 3UR Support - Development Tools

At ones where they don't sell 93 because it isn't worth the bother.

 

There are several complicated formulas. Air density at higher altitude is less. also temperature changes it. static pressure Vs boosted pressure boosted is more forgiving, but pressurizing causes heat.
Imagine a sea level 6 lb boost turbo system puts out 4 lbs at 4000 feet but thats only part if it because the volume stayed the same At altitude. Google it and get lost in a rabbit hole.

 

Basically, as PeakIT said, there are lots of factors that determine the density of the air, but basically, at higher altitudes the normally aspirated engine can handle lower octanes because the thinner the air, the slower the travel of the flame path in the combustion chamber. Because of all the complexities of air pressure, humidity, density altitude, and on and on, this is why your engines have knock sensors, O2 sensors, IATs, MAFs, etc. They send all the factors to the ECU and the ECU calculates the ignition timing, valve timing, injection timing and duration, etc. based on the inputs. They do all the work, so you don't have to.

EDIT....I'll add one more thing to answer your question. You are safe to use 91 octane at ANY altitude with a 93 octane tune. What will happen, is that your engine will produce slightly less power, because if needed, the ECU will compensate by slightly detuning the engine with things such as retarding timing or enriching the mixture, because the knock sensor detects some detonation. There are limits to how much the ECU can compensate for lower octanes, but I'm pretty sure you won't ever have a problem driving from Texas into and through the Rockies with 91 octane. Don't put any diesel in your Tundra, because the octane numbers for diesel really really suck!!

 

My answer was easier to type on a phone.

 

Anyone getting hard 2-3 shifts with OV?

My 15 SC felt amazing but this truck (16 FFV SC) on the initial OV will have pretty ugly hash banging into 3rd under light to moderate throttle. Sometimes it almost feels like a slip, others just feels like a hard (increased pressure) shift.. then about 50% of the time its kind of ok feeling.

Kinda hard to figure out the exact circumstances. I HAVE noticed that in S mode and in D or S with tow/haul I dont see it. Only Drive, non-tow.

 

The only two things that come to mind for me are to try to get a log of the occurrence, and to make sure that the transmission fluid level is correct.

 

Yeah. Im waiting on an email reply (zendesk) from them. Sent him logs about a week ago. After we get the update onboard ill scan and drive some more and try yo get an exact scan using whatever parameters he needs.

Just curious if anyone else experienced this. I remember hearing about BD SC FFV tune having a harsh 2-3 shift so I was wondering if its a truck/year issue.

 

My 2011 with the BD SC FFV tune had 2-3 shift issues. It would run the gear out too long and sort of lazily slip/shift up to 3rd. It was usually only an issue after first start up and mostly went away once warmed up. It was more pronounced when I was towing. I drove that tune for a couple of years until I got OVTuned over a year ago. Sadly I just sort of learned to drive around the shortcomings using throttle pressure

 

Very interesting. Mine seems worse when cold too.

 

@OVTune
Hey Matt,
I just got my wideband in today and it's definitely very lean. At a pretty hard throttle (maybe 75%) I'm into boost at 5psi and still 14:1AFR for a solid 3 to 4 sec before it drops down to around 13s. I let off and really haven't going too "full throttle" afraid to hurt something.

I sent you some logs like you asked via email June 3rd... #5357

I wanted to send you another email but I think you said once that it kicks it back to the bottom.. so Im hoping you'd see this here.

 

Is 14.1 too lean in those conditions?

What AFR should I be at with 90% throttle and say 7 PSI boost?

I always thought under 14.7 was ok

 

You would want below 12:1 on a boosted Tundra under full load

 

I generally shoot for 11.6-11.8 under load in boosted applications as a "safe" ballpark on pump gas.

 

Just don't floor it, as long as it isn't pinging you're 100% fine. You could run on 85 octane totally fine for 90% of the time I bet. I've run 85 octane and have a 93 octane tune with a blower. Carrying fancy concentrates or race gas is a waste of money imo, just be smart and don't go crazy if you can't find high octane.

 

What AFR are you at under normal loads and say around 3 PSI boost?

I just installed a harrop 2650 on my 2019 , but I'm not running any tune as it has not been available. Running 91 octane as that is the best we have here in most of Colorado, no pinging or other issues as far as I can tell.

With high quality Shell gas my timing Advance is about 12 degrees at idle, up to 35 degrees under load, which is only a couple degrees higher than it was stock.

Under full load I think the richest I get is about 12.5:1. But a lot of the time I am in the 13s even up to 5 PSI or so.

I'm seeing about the same numbers as stock which I thought was a good thing, so honestly I was pretty happy that I didn't have to be in a rush to tune it as I've read up multiple things about hard shifting and other issues while the tune is getting worked out that I just don't want to deal with right now when everything seems to be running great.

Should I be worried that I'm not necessarily running richer than stock for the time being? What damage can be done if I keep running it like that? Harrop engineering and the shop that installed it told me that I should be very happy if I'm running the same as stock numbers with a supercharger installed. Maybe not though?

Thanks for the help! Never supercharged a Tundra before

 

@OVTune I have not received the hard drive or any response to my emails I don’t think your zen desk is getting my messages? Order 5221

 

When will you be able to actually buy everything for the 2019''s ?

Well, the sites been updated but not seeing the tundra tune pack.

 

tracking info I emailed to you

everything for 19 is available

 

@OVTune, Sorry to badger, I was just wondering if you've been able to find any time to ponder sending out the remaining tunes that were hinted at from a week or so ago? (#4706) Thanks man.

 

Matt,

Also sorry to badger but any update on 5357?
I sent another zendesk, very concerned with the AFR.

My old SC15 was into the 12s at any kind of boost and this 16SC is 14s well into 4/5psi... Eventually hitting 11.5 or so well into WOT.

I flashed the SC912 file you sent, confirmed that today.

 

I don't see the 2019 tune pack. I seen the vf software and flash combo. I want a starting point on tune and features and thought it was a separate item.

Nevermind, I looked in the 2018 pack and seen it is for 2019 also. Thanks!! Will be ordering ASAP.

 

Got the email thanks!

 

Will get back to you asap, this is an easy fix, just changing the throttle angle requirement for enrichment to start.


FYI, for anyone with a 18, 19, or 2020 (as harrop is even offering "no tune" 2020s.........) you will get no enrichment at all until after 70% throttle, so you can be full boost all day and 14.7 AFR
which is waht you are seeing, except your throttle % is not that high.

 

Any help with this?

Should I be worried about damage at 12.5 - 13 AFR under full boost?

Thanks!!

 

Being in Colorado you can likely get away with it. That high elevation reduces atmos pressure by almost 3 psi, and overall 20-25% less total power output. So your cylinder pressures are way down compared to that of sea level.

But at sea level it is a recipe for failure (eventually). Especially if you were creating excess heat like towing in boost.

 

Yes, you should be worried, especially on stock bottom end. Also, you said timing is at 35 degrees under boost - that’s crazy advanced!

 

32 degrees under full throttle? there is no way, it would have already blown up

 

That’s what he said in post 3770

 

Thanks man. When I am ready for a tune, where do I go to purchase it and how to get started?

I do think I should tune it now that it is available for the 2019's, I am just worried about mak

Sorry for confusion, I said under load but I meant under very light load. Like when coasting at 2K RPMS. Last I remember seeing I was close to 15 degrees when I was at like 5 PSI boost. Does that sound normal?

 

okay that makes more sense. 32 degrees at full boost and pump gas would likely kill this engine from detonation even if your fuel was *perfect*


yes 2019 full support is ready and we have cables