Jb4 94mph limp mode map 3+

[Nigel Carson]

Hey guys so I’m having a very strange issue, it’s an 18 stinger gt rwd, plugs at .24, and air filters. Any map above 2, the car hits total boost cut and the fly by wire closes the throttle at exactly 94mph. Am I missing something here lol? Anything I should try? Map 0-1-2 are all fine.

 

[Terry@BMS]

If you need tuning help post a JB4 log in the n54tech support thread and we can check it out.

 

[Not Here Anymore]

Hey guys so I’m having a very strange issue, it’s an 18 stinger gt rwd, plugs at .24, and air filters. Any map above 2, the car hits total boost cut and the fly by wire closes the throttle at exactly 94mph. Am I missing something here lol? Anything I should try? Map 0-1-2 are all fine.

I have the same with my chip in the highest map , as soon as you pull hard it goes into limp mode back off the throttle a bit and it picks up again unless it is held too long , mine has the secondary cats removed lower maps no problems

 

[Tonkabob]

I think Arnie may be a race chiper? Its either octane or overboost/ over torque. Octane problem should go richer and start pulling individual timing and extreme cases can chop throttle. Overboost/ torque will chop all timing at once by alot, like down to 1-3 range and after 1 second cut throttle for about 1 second. Jack up the octane and try again if you don't have logging.
The overboost / tork happens around 21 psi give or take .5. I call it over boost/tork since even when hiding boost it still happens so its not just ecu boost based.
I hit this at 18 ecu psi when i was hiding 2.5 psi and a few times at actual 21 psi. Brake snipping makes me overboost and adding a couple jb4 psi on top of my ecu tune also makes me overboost.

 

[Not Here Anymore]

I think Arnie may be a race chiper? Its either octane or overboost/ over torque. Octane problem should go richer and start pulling individual timing and extreme cases can chop throttle. Overboost/ torque will chop all timing at once by alot, like down to 1-3 range and after 1 second cut throttle for about 1 second. Jack up the octane and try again if you don't have logging.
The overboost / tork happens around 21 psi give or take .5. I call it over boost/tork since even when hiding boost it still happens so its not just ecu boost based.
I hit this at 18 ecu psi when i was hiding 2.5 psi and a few times at actual 21 psi. Brake snipping makes me overboost and adding a couple jb4 psi on top of my ecu tune also makes me overboost.

Yes Tonkabob, I just talked with a tuner Classified Motorsports here in Kelowna , and told him what happened recently on the circuit track a few week s ago and after hitting full throttle coming out of the corner and approx 3 k it goes into limp mode , so apparently it is most likely over spooling / over boast and my octane was between 98 and 101 it never done this until after I put the JuneBl down pipes with my Borla exhaust, I guess with the two cats missing she just spools up to fast

 

[Tonkabob]

Yes Tonkabob, I just talked with a tuner Classified Motorsports here in Kelowna , and told him what happened recently on the circuit track a few week s ago and after hitting full throttle coming out of the corner and approx 3 k it goes into limp mode , so apparently it is most likely over spooling / over boast and my octane was between 98 and 101 it never done this until after I put the JuneBl down pipes with my Borla exhaust, I guess with the two cats missing she just spools up to fast

Yes, limp mode is certainly overboost and easier to do at the low RPMs especially with out any Cats.
Have to turn down the boost on the twisty track but probably will be fine in a 1/4 mile since the RPMS stay up above 4800 except in 1st.