Flex Fuel Sensor for JB4 coming soon

Talking to Mr. Burger this week and he mentioned that a flex fuel kit is in the works for our trucks and should be released in the next few weeks. This is awesome news for those of us with or interested in their JB4. We will now be able to monitor ethanol content within the JB4 app and get that perfect mix. I'm not sure if full E85 will be possible in the future but I do like having the ability to have a "flex fuel" tune for whatever mix I might be able to run.

 

Does the JB4 connect to the fuel system at all? If not, the issue is gunna be if the fuel trims can compensate for E85. Thats a big ask and I know the Ecoboost can’t do it on fuel trims alone. The target AFR has to be changed in the tune for anything >E30

 

I imagine a sensor would have to be inline to the fuel to get the ethanol content. Most likely the injector are not big enough to take advantage of E85 but that is cool. with the flex kit, I could add a couple of gallons of ethanol in the summer to help run a little cooler.

 

with the dual injection, there might be enough fuel capacity. It depends how big the turbos are and if the fuel can match the air

 

It plugs in to the obd2 port and reads fuel trims

 

quick update, flex fuel sensor kit should be released by the end of the month or sooner.

 

Definitely going to run out of air on the top end. The compressors are pretty small. Probably going to overrev them trying to increase to end boost. E85 might help decrease turbo lag on the low end but is it necessary…?

 

It's out...placed my order earlier today. Plan is to eventually get the algorithm down so that the tune adjusts automatically based on ethanol content...aka flex fuel tune

https://burgertuning.com/products/f...022-toyota-tundra?_pos=2&_sid=7e7c7b031&_ss=r

 

But can you just dump E85 in the tank and it will work? There is enough margin in the fuel trims?

And what happens when you hit timing limiters way before the ethanol shows any advantages? My Ecoboost would hit cylinder pressure limits on the stock tune with 94 octane on a cold day.

 

full e85 is not supported at this time via the JB4, from what I was told. Their tunes are setup for E30 for now but I was told that the plan is to eventually go full E85 capable.

Cant answer the rest since I am not part of the R&D. Sorry about your ford

 

Installed the ethanol content sensor and its been working perfectly. Hardest part was opening the jb4 and sliding the pin into the connector...15 minute install, tops. If you plan on running E30, this makes life so much easier when it comes time to mix. Hopefully they will eventually support a true flex fuel tune but for now, this will do.

 

Don't be sorry about my Ford. I can actually tune it . The cylinder pressure limiters have been remove for about 2 years now. I am about to go to E30 or E50 tuned.

My point is though, that the Tundra probably also has similar limiters in place which limit ignition timing based on air load and RPM. That is how they prevent the truck from making too much torque. If you could just run 110 octane race fuel and your truck took full advantage of it, then it would make way beyond the torque that Toyota intended, so they have to prevent that somehow.

Eventually, higher Octane may not be doing anything, because the ECU simply doesnt allow additional timing. It would be worth testing and seeing if you are actually getting more timing out of E30 than 93 octane.

 

Thats awesome that the app works on Android Auto. I've always wanted a setup like that.

Can you datalog the fuel trims?

 

yessir

 

I'm actually quite impressed at the amount of items you can datalog via the mobile app and to what precision it does so. The setup Eddie has is using the binize box (from Amazon). I WISH normal Android Auto allowed you to put the JB4 app up but it doesn't through the standard means.

 

What are the trims at on E39?

 

under what conditions?

 

I think any conditions are fine. The whole point of the trims is the make a large correction for the AFR being off so I wouldnt imagine they would change much once they get to where they need to be.

I know on my lexus there are separate fuel trims for low, medium and high loads.

 

i can do a quick log and check...they show up as 25 on the app but that's considered perfect for the PID...idk why they set it up like that...so 25 = 0% STFT

 

What about LTFT? I think that would be the one that is compensating.

 

i dont see LTFT. ST is the one compensating on the fly though and I would expect it to be pegged if it wasnt able to keep up with the additional fueling demand from the E

 

At idle, ac on, in park.