Anyone using JB4?

[wrapfee]

Yep! The Fuel-it app has a calculator (there are others online as well) that has you put in how much fuel you currently have left in your tank (you can use the Supra Connect app to see this) and what your target ethanol content is. On an average fill up, I usually add somewhere between 2.5 and 3 gallons of ethanol to hit e25. The Fuel-it sensor has been pretty great for this and has taken all the guess work out of it. Some folks will look at you like you are crazy when you use two different pumps at the same station

LOL! That's good info, I appreciate it man. I'll check out the Fuel-It sensor as well!

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[superd6199]

So I just installed my JB4 on Friday and posted some logs on N54 Tech and haven’t heard anything back. Do you guys who’ve posted your logs there have any idea how long they typically take to get back to you?

My log experience with N54 has been several days and on a few occasions I had to bump the thread to get it noticed. Good luck with your log reviews.

 

[JRedMKV]

My log experience with N54 has been several days and on a few occasions I had to bump the thread to get it noticed. Good luck with your log reviews.

Yes, actually they did get back to me already and everything looks clean on Map2 so far.

 

[max]

Yep! The Fuel-it app has a calculator (there are others online as well) that has you put in how much fuel you currently have left in your tank (you can use the Supra Connect app to see this) and what your target ethanol content is. On an average fill up, I usually add somewhere between 2.5 and 3 gallons of ethanol to hit e25. The Fuel-it sensor has been pretty great for this and has taken all the guess work out of it. Some folks will look at you like you are crazy when you use two different pumps at the same station

As a jb4 user, only thing I would add is if you are going to go the E85 route, might want to invest in a tester as well.....not all E85 pumps are created equal and if the bad stuff gets in, engine will run crappy until the fuel has emptied. Extreme case, could be damage to fuel system. Have heard of guys having to remove their tank to have it emptied......Kind of "pricey".

 

[HookemNC]

As a jb4 user, only thing I would add is if you are going to go the E85 route, might want to invest in a tester as well.....not all E85 pumps are created equal and if the bad stuff gets in, engine will run crappy until the fuel has emptied. Extreme case, could be damage to fuel system. Have heard of guys having to remove their tank to have it emptied......Kind of "pricey".

Raleigh area sheets all have 70% on the button haha. I've tested like ten different ones but yes, that's a great point to add. Definitely should buy a test kit and test the ethanol percentage.

 

[Hendo]

I just installed my JB4 and I'm trying to figure out exactly how much benefit I'm getting out of it. I've been diggin through logs and noticing that the ECU seems to be compensating for the boost the JB4 is adding.

When I first installed the JB4 I was smashing 20-24 lbs of boost, but the throttle was closing that the ECU was pulling timing. once the ECU started to learn it was just requesting less boost inverse of what the JB4 was adding (requesting 12-16 when the JB4 is adding 4 instead of the 16-20 it was requesting when i first installed it) and added ignition advance back in.

Essentially the JB4 tries to trick the ECU into adding boost, but because the way this ECU operates that may not always add power. This ECU makes a calculation based on torque requested whether it wants to add boost or timing or some combination of the two. It appears that if it sees too much boost it will just pull timing and adjust.

I'm going to continue to log and throw those numbers into virtual dyno as well as do some dragy runs to see what the real world gains are.

Any one know an easy way to reset ECU learning??

 

[Sigg]

I just installed my JB4 and I'm trying to figure out exactly how much benefit I'm getting out of it. I've been diggin through logs and noticing that the ECU seems to be compensating for the boost the JB4 is adding.

When I first installed the JB4 I was smashing 20-24 lbs of boost, but the throttle was closing that the ECU was pulling timing. once the ECU started to learn it was just requesting less boost inverse of what the JB4 was adding (requesting 12-16 when the JB4 is adding 4 instead of the 16-20 it was requesting when i first installed it) and added ignition advance back in.

Essentially the JB4 tries to trick the ECU into adding boost, but because the way this ECU operates that may not always add power. This ECU makes a calculation based on torque requested whether it wants to add boost or timing or some combination of the two. It appears that if it sees too much boost it will just pull timing and adjust.

I'm going to continue to log and throw those numbers into virtual dyno as well as do some dragy runs to see what the real world gains are.

Any one know an easy way to reset ECU learning??

Are you running Ethanol?
I noticed my timing greatly improves after adding octane aka E juice. Across all maps timing seems to be greatly improved where as b4 it was pulling a little timing with 93.
Adding flex fuel sensor and WMI within a couple weeks as well for obvious reasons.

 

[Hendo]

Are you running Ethanol?

Yes I add a gallon or so just for a bit of safety.

I noticed my timing greatly improves after adding octane aka E juice.

Did it improve due to the ethanol or improve because your ECU adapted and lowered boost??

 

[Sigg]

Yes I add a gallon or so just for a bit of safety.



Did it improve due to the ethanol or improve because your ECU adapted and lowered boost??

I did many pulls with 93 only with similar results, after two logs with roughly e30 things improved greatly. I followed advice from other posts from N54Tech. If the quality of 93 around is poor it doesn't seem to run well on JB4.

 

[Hendo]

I did many pulls with 93 only with similar results, after two logs with roughly e30 things improved greatly. I followed advice from other posts from N54Tech. If the quality of 93 around is poor it doesn't seem to run well on JB4.

My logs cleared up on 93 map 1, but the boost levels are much lower than before.

I'm gonna science the shit out of this! And by that I mean I'm going to run tests, collect data, and see what it says.

 

[Sigg]

My logs cleared up on 93 map 1, but the boost levels are much lower than before.

I'm gonna science the shit out of this! And by that I mean I'm going to run tests, collect data, and see what it says.

My boost levels haven't changed just timing. And heck yeah. I would post logs at n54tech.com Terry or Steve @ BMS should be able to help you out.

 

[Nchaydar]

I am running a Jb4 with catless downpipe and a E30 blend however I keep getting a MIXTURE TOO LEAN code. Has anyone else had this issue ?

 

[Hendo]

I am running a Jb4 with catless downpipe and a E30 blend however I keep getting a MIXTURE TOO LEAN code. Has anyone else had this issue ?

I have not, what do the logs say? What are you using to monitor ethanol content??

 

[sstevens7]

I just installed my JB4 and I'm trying to figure out exactly how much benefit I'm getting out of it. I've been diggin through logs and noticing that the ECU seems to be compensating for the boost the JB4 is adding.

When I first installed the JB4 I was smashing 20-24 lbs of boost, but the throttle was closing that the ECU was pulling timing. once the ECU started to learn it was just requesting less boost inverse of what the JB4 was adding (requesting 12-16 when the JB4 is adding 4 instead of the 16-20 it was requesting when i first installed it) and added ignition advance back in.

Essentially the JB4 tries to trick the ECU into adding boost, but because the way this ECU operates that may not always add power. This ECU makes a calculation based on torque requested whether it wants to add boost or timing or some combination of the two. It appears that if it sees too much boost it will just pull timing and adjust.

I'm going to continue to log and throw those numbers into virtual dyno as well as do some dragy runs to see what the real world gains are.

Any one know an easy way to reset ECU learning??

One of the common responses from terry and Steve on n54 is they notice due to bad fuel or lower octane it starts to pull timing and they almost always advise the poster to add some E, do some data logging and send the logs.

They are now saying on 2021s that they like to run on map 5 and adjust your duty bias and FF. I’m doing just that right now and am getting consistent boost across the rpm band no e blend for me though. Just 93 octane. Not wanting to mess with blending e fuel in.

 

[Shay]

One of the common responses from terry and Steve on n54 is they notice due to bad fuel or lower octane it starts to pull timing and they almost always advise the poster to add some E, do some data logging and send the logs.

They are now saying on 2021s that they like to run on map 5 and adjust your duty bias and FF. I’m doing just that right now and am getting consistent boost across the rpm band no e blend for me though. Just 93 octane. Not wanting to mess with blending e fuel in.

I was also advised to run Map 5 as apposed to Map 3 on my 2021. Does anyone know why an absolute map is preferred over an additive map? What adjustments are you making to FF and Duty Bias?

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