JB4, low boost?

[Corleone1]

Take the negative off your battery for 5-10 minutes to reset the ECU. Also does your JB4 have fuel wires?

Many tuners say that lift of contact from the ECU is better and the right way to reset ECU...

 

[txkelo]

Take the negative off your battery for 5-10 minutes to reset the ECU. Also does your JB4 have fuel wires?

I dont believe so, then again I havent checked thoroughly. Where would they be located? and i'll for sure do the battery thing to reset it.

 

[txkelo]

Take the negative off your battery for 5-10 minutes to reset the ECU. Also does your JB4 have fuel wires?

I dont believe so, then again I havent checked thoroughly. Where would they be located? and i'll for sure do the batte

Interesting that its actually giving you more boost with the JB4 disabled, but replace the plugs and double check all the connections that the JB4 has, and get new gas.

I'll check the connections and get those changed, thanks!

 

[rpoffen]

Something is way off. From the MPH, it is hardly accelerating.
Are you sure there is no boost leak somewhere? Surprised there is no code.
Hopefully the ECU reset will cure it.

 

[txkelo]

Something is way off. From the MPH, it is hardly accelerating.
Are you sure there is no boost leak somewhere? Surprised there is no code.
Hopefully the ECU reset will cure it.

I've tried to look for one but dont believe there is, whats a way I can check for sure if there is one. Also I hope it does, i'll be home later so i'll make sure to post and let everyone know what happens after I reset it. I reset it by unplugging the battery correct?

 

[txkelo]

you can if you want but it may still have super low boost. really you should post some under the hood pics to see if we can see any basic stuff that may be causing it.

 

[rpoffen]

What about the piping before/after the intercooler?
Or the intercooler itself?

 

[txkelo]

What about the piping before/after the intercooler?
Or the intercooler itself?

Intercooler is stock, I took off the negative side of my battery and did a quick pull like that. I'll post those now

 

[txkelo]

I think I did the reset right, map2 and 0. Let me know if anything has changed.

 

[Thomby]

You're logging a bunch of rows at less than full throttle, I'm guessing by manually hitting the logger. The JB4 should log automatically at >70/80% throttle, that will make the files easier to look at.

But if you scroll down to where Pedal = 100, and look at the ECU_PSI, Target, and Boost columns, you can see that in Map 0 your ECU is running up to 11-12 psi which is about what's expected, whereas on Map 2 it caps out around 8 with an additional 4-5 targeted by the JB4 (which is what Map 2 is supposed to add, but to the 12ish stock peak).

The only other significant difference I see is that Map 2 is running much more aggressive timing (ign_1 column), from 16-19 degrees vs. 10-13 on Map 0. If anything I would expect a gas/octane/plug issue to show timing pulls in Map 2 (ign_1 dropping >3 degrees at a time, or ign_2 through _6 columns showing values >3 since they're the offset from ign_1), but that doesn't appear to be happening. I would post those two logs on the jb4tech forums for BMS to look at.

 

[minkyu1008]

I think I did the reset right, map2 and 0. Let me know if anything has changed.

I have the same problem. Did you fix it?