JB4, low boost?

[txkelo]

Im running 93 on map 2, from watching videos on everybody else making good boost I feel as if im not making as much. My Pre boost reading is around 8.50-11. Is there anybody that can help me out?

 

[Thomby]

Do a full throttle run through a couple of gears, it should auto log by default. Email it to yourself and post here. You'll be able to see what the ECU thinks boost is, what the JB4 is asking for, and the actual total boost.

Since the ECU targets load rather than a specific boost number there's no exact value you're looking for, but the ECU will probably top out around 12 psi and in map 2 the JB4 will add 4-5 (it tapers down up high), meaning peak boost around 16-17 psi. Not sure where you're seeing that 8.5-11, but if it's from the ECU as it spools, that's not unreasonable. You could also do a run on map 0 to see what your stock baseline is.

 

[txkelo]

this is a Map2 pull, Still trying to learn the JB4 but from what I seen others run mine doesn't look anything like that.

 

[ChaneRZ]

Post csv log

 

[txkelo]

Post csv log

 

[txkelo]

Let me know if those work, if not I have others! Thanks guys

 

[G70LEbyAdoom]

Let me know if those work, if not I have others! Thanks guys

Your boost does seem really low, and you are getting timing pulled where it shouldent be. Im thinking bad gas. What did you put in it? 91? 93? I would drain it as low as possible and go to a different station and try their premium. maybe some 87 got put in the wrong tank when the station last got filled.

 

[txkelo]

Your boost does seem really low, and you are getting timing pulled where it shouldent be. Im thinking bad gas. What did you put in it? 91? 93? I would drain it as low as possible and go to a different station and try their premium. maybe some 87 got put in the wrong tank when the station last got filled.

I been putting 93 in it, when I first got it from the dealership it was very sluggish so I drove all the gas out and then started putting only 93 since. That helped it a bit but I know its nowhere where it should be. I did buy it used and it came with everything in the "450 hp" BMS/JB4 package. Im also changing the plugs soon just incase. Other than that im out of ideas.

 

[G70LEbyAdoom]

I been putting 93 in it, when I first got it from the dealership it was very sluggish so I drove all the gas out and then started putting only 93 since. That helped it a bit but I know its nowhere where it should be. I did buy it used and it came with everything in the "450 hp" BMS/JB4 package. Im also changing the plugs soon just incase. Other than that im out of ideas.

are you still on stock plugs then? From a dealer or was it a private sale with all the JB4 stuff on it already?

 

[Rodtheviking]

Was the JB4 on there when you bought the car? If not you need to address the sluggishness first. I would remove the JB4 and do the adaptive values reset (disconect the battery for about a half hour) then drive it for a bit.

EDIT: Beat me to it, could be plugs.

 

[txkelo]

are you still on stock plugs then? From a dealer or was it a private sale with all the JB4 stuff on it already?

Bought it from a dealership, just came with everything on it. The plugs I recently checked and they are Denso plugs. I just got some HKS plugs.

 

[txkelo]

Was the JB4 on there when you bought the car? If not you need to address the sluggishness first. I would remove the JB4 and do the adaptive values reset (disconect the battery for about a half hour) then drive it for a bit.

EDIT: Beat me to it, could be plugs.

It was on Map 1 when I got into the app. Still boost was even lower. I hope the new plugs fix the problems

 

[G70LEbyAdoom]

It was on Map 1 when I got into the app. Still boost was even lower. I hope the new plugs fix the problems

Its def worth a shot, if it doesnt fix it, take the JB4 off the car and see if you still get really really low boost stock. if so, take it to the dealer and tell them to fix it under warranty cuz they sold you a car with an issue.

 

[txkelo]

Its def worth a shot, if it doesnt fix it, take the JB4 off the car and see if you still get really really low boost stock. if so, take it to the dealer and tell them to fix it under warranty cuz they sold you a car with an issue.

Should I post a map0 pull?

 

[G70LEbyAdoom]

Should I post a map0 pull?

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.

 

[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.

Gotcha! i'll take some detailed pictures later today.

 

[cncBilly]

Should I post a map0 pull?

Yes

 

[txkelo]

Yes

 

[cncBilly]

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

 

[G70LEbyAdoom]

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.