[faithkharkov]

N54 w/ FBO including a Fuel-It stage 1 fuel pump upgrade.
Been running vargas stage 1 billet impeller turbos for a year now, MHD E50 map and it runs fantastic, 490hp on the dyno.
So this year I've dropped a set of Vargas stage 2+ turbos on there; added a 3.5 bar pressure sensor in preparation for a custom tune.
New turbos run great, def difference with them.
Installed a JB4 and the 3.5bar sensor and did some test hits on it using the JB4 maps instead of my tried-n-true MHD.
Anyway; launched like I was rearended by a Mack truck and then shut off. Literally.
Attaching the MHD error codes. Shop says it could be (??) fuel pump issue, as they show only 50bar at idle and 70bar total before shutting off around 2k rpm.

Any ideas?

[lookalikehuuh]

Would likely be useful to have you capture a log and post it so we can see what the system is reporting back.

Also why go with JB4 when you already had MHD ready and installed?

[faithkharkov]

Originally Posted by lookalikehuuh

Would likely be useful to have you capture a log and post it so we can see what the system is reporting back.

Also why go with JB4 when you already had MHD ready and installed?

If I had logged it, I would have posted it. Sadly I didnt.

Adding the JB4 allows me to have a custom tune done, making a sweet little BEF

[faithkharkov]

most likely a fuel pump and sadly, most likely the highpressure pump, according to both guys who plugged into the car.
Nothing over 500psi after 2k rpm
Idle-to-2k is 450-500psi