Jb4 E85 Problems!

[Sid3waze]

Hey guys, I'm having issues with my jb4, maybe someone can chime in if they experienced this before.

My car runs like crap with E85 in it, it feels much stronger on pump. I have DP, and fully catless, I break up in 4th gear gear WOT and would sometimes throw a drivetrain malfunction. The car feels stronger on 93 but as of lately I would also break-up when just having pump in the car! Maybe it's an inssue with the jb4? BTW I am running map 2 and I don't put more than 2 gallons of e85 with a full tank of 93.

[TMR]

I have the same problem.

[///M ARMY]

Are you running the latest fireware? Do you have any logs as well?

[Richy Rich]

Probably because of the e85 blend you're running.

[TeKiZeRo]

How much E85 are you putting in? Whats the total ethanol percentage (E20, E40, etc.)?

[gtrsam]

do you have the fuel mass sensors connected? have you checked on n54tech?

Sputtering in high gear means fuel trims are maxing out. you need to connect the Fuel mass connector and if its already installed then raise the open loop setting in the JB4 interface.

[gtrsam]

Originally Posted by TeKiZeRo

How much E85 are you putting in? Whats the total ethanol percentage (E20, E40, etc.)?

says 2 gals and the rest pump which is like e15

[A Frankfurt]

Originally Posted by germen730

Hey guys, I'm having issues with my jb4, maybe someone can chime in if they experienced this before.

My car runs like crap with E85 in it, it feels much stronger on pump. I have DP, and fully catless, I break up in 4th gear gear WOT and would sometimes throw a drivetrain malfunction. The car feels stronger on 93 but as of lately I would also break-up when just having pump in the car! Maybe it's an inssue with the jb4? BTW I am running map 2 and I don't put more than 2 gallons of e85 with a full tank of 93.

What are your drivetrain malfunction fault codes ?

[TeKiZeRo]

Originally Posted by gtrsam

says 2 gals and the rest pump which is like e15

Yeah, that shouldn't even cause any issues. Do you have the fuel sensors in?

[gtrsam]

It most likely has to do with the fuel sensors not being plugged in. I think without these plugged in you will have issues with e85 mixtures.

[MasterC17]

This is why I no longer run E85. Car does not run properly on it in my opinion.

[MENAC3]

My car runs fine with e85 in it and I have no fuel sensors in, I actually don't know what they are. Can someone chime in??

I usually put 3 gallons of e85 mixed with 93 octane, my car pulls like an animal with that mix.

[mike@x-ph.com]

Update to the latest firmware.
and please post logs.

[gtrsam]

Originally Posted by MENAC3

My car runs fine with e85 in it and I have no fuel sensors in, I actually don't know what they are. Can someone chime in??

I usually put 3 gallons of e85 mixed with 93 octane, my car pulls like an animal with that mix.

it is one of the sensors that needs to be plugged in for stage 3 along with the EWG connectors(these are not necessary though). the fuel mass sensors are also not necessary for stage 2 but recommended

[8600RPM]

What does this fuel map sensor do? Why don't ess require it for their high power torque tune which puts out similar numbers? Isn't having adequate octane the most key factor?

[Sid3waze]

Originally Posted by germen730

Hey guys, I'm having issues with my jb4, maybe someone can chime in if they experienced this before.

My car runs like crap with E85 in it, it feels much stronger on pump. I have DP, and fully catless, I break up in 4th gear gear WOT and would sometimes throw a drivetrain malfunction. The car feels stronger on 93 but as of lately I would also break-up when just having pump in the car! Maybe it's an inssue with the jb4? BTW I am running map 2 and I don't put more than 2 gallons of e85 with a full tank of 93.

Originally Posted by MasterC17

This is why I no longer run E85. Car does not run properly on it in my opinion.

My car never ran strong with it also. I will be taking the car to ACM for further diagnostics.

[Myaddiction]

Originally Posted by germen730

My car never ran strong with it also. I will be taking the car to ACM for further diagnostics.

Did you install it? Sound like as others have said you don't have the Fuel taps installed. I'm guessing you had it installed for you and they didn't bother to do the full install.

You should post this stuff at N54 tech, where the inventor/owner of the JB4 and his staff check all day everyday to answer support questions. Their support is really good and it wont be a bunch of us just guessing at your problem. Just trying to help you out.

Good luck

[MENAC3]

Originally Posted by gtrsam

it is one of the sensors that needs to be plugged in for stage 3 along with the EWG connectors(these are not necessary though). the fuel mass sensors are also not necessary for stage 2 but recommended

Oh I see, where are these sensors plugged in? What benefits would I see if I opted to get these and go stage 3?

[gtrsam]

Originally Posted by MENAC3

Oh I see, where are these sensors plugged in? What benefits would I see if I opted to get these and go stage 3?

the sensor is located by the intercooler reservoir near the firewall. you actually have to unscrew the sensor to unplug it because the clip is underneath. total pain to get it. its recommended for stage2 for fuel mixtures and required for stage 3 for race gas.

[8600RPM]

Why would it be required for race gas given its stoich is obviously the same as regular fuel? I could see for e85 where you need significant higher levels of fuel to keep up.

Can someone explain what this controller is doing?

[betlion]

add in e85 when your tank have 3/8 left

[A418t81]

Originally Posted by 8600RPM

Why would it be required for race gas given its stoich is obviously the same as regular fuel? I could see for e85 where you need significant higher levels of fuel to keep up.

Can someone explain what this controller is doing?

It has to do with the way the new ECU works. It's a lot different than earlier systems, and has to do with the fuel trims. The ECU has the ability to add and subtract fuel to meet its fueling targets. In the past, the ECU would add fuel up to it's pre-determined limit and then just sit there. Not the case now. When you are not running the fuel mass connectors, the high pressure fuel pump is not producing higher pressures and the ECU is using a lot of it's fueling headroom just to fuel the extra power you are making on pump gas. When you add E85 in, this pushes the fuel trims even farther positive until it hits the maximum amount it can add...what the ECU does next is what makes the car run like crap. Instead of just sitting there at max fuel trim, the ECU actually dumps a large amount of fuel and the mixture goes super rich. This is what causes the misfiring and break-up in the higher RPM and longer gears.

What is funny is that each car is a little different. Some can get this to even happen on pure pump gas in colder weather. Others can get away with a little E85 mixed in, but typically these owners don't push the cars as hard or are in conditions/weather that doesn't allow maximum power production.

Anyway, the point of all of this is that if you DO NOT have the fueling connected, don't expect the car to run well at full throttle and higher gears on E85 mix. Stick to pump gas.