Boost leak?

[JamesF80m3]

Recently went Pure Stage 2+, Port Injection, E85

had the car strapped to the dyno. Was told by Cary Jordan the car has a boost leak. I've also noticed my WGDC is very high. Car still managed to put down 670whp and 650tq on a DynoJet

Chargepipes are on tight and so is J pipe, not sure where else to check or where to go from here. Below is my datalog from the dyno

https://www.bootmod3.net/log?id=6041...90c6710d082d7e

[RugbyBro]

Check the cold side connection to the air intake - a few of us are having an oil leak there which would also imply a slight boost leak. Just remove your skid plate and look directly up and if you see oil on your turbo, that's at least one leak right there

https://f80.bimmerpost.com/forums/sh....php?t=1545217

[StockM4]

Thats very low numbers for that setup.... u definitely have a leak somewhere

[Squishymthree]

Hello, does someone know why is my car misfiring.
I've change spark plugs. Fuel injector , coils. High fuel pressure pump
Low fuel pressure pump,
High fuel sensor
Low fuel sensor. And after all of that I still get misfire on several cylinders.
I've also did a compression test on al cylinders and there good 187 all of them.
Please please help

[JamesF80m3]

Originally Posted by Squishymthree

Hello, does someone know why is my car misfiring.
I've change spark plugs. Fuel injector , coils. High fuel pressure pump
Low fuel pressure pump,
High fuel sensor
Low fuel sensor. And after all of that I still get misfire on several cylinders.
I've also did a compression test on al cylinders and there good 187 all of them.
Please please help

You should probably make your own post, your issues are the complete opposite of mine

[JamesF80m3]

Pulled these codes. Wonder if they have anything to do with my issues

[TopJimmy]

No pic of codes attached

[JamesF80m3]

Originally Posted by TopJimmy

No pic of codes attached

My bad thought I uploaded the screenshot

[JamesF80m3]

Codes

[tomlong]

Perhaps check the nipple for the vacuum line connection on the J-Pipe, which also connects to the Bank 1 intake located post MAF sensor to verify if it's completely seated & sealed? 🤷

[TopJimmy]

Originally Posted by tomlong

Perhaps check the nipple for the vacuum line connection on the J-Pipe, which also connects to the Bank 1 intake located post MAF sensor to verify if it's completely seated & sealed? 🤷

Friggin exactly my thought... It's where I had a little leak. I needed a fingertip of grease inside my intake fitting so the o-ring sealed good. My J connection was dry and stuck so that fitting got a dab too. This trick came from an M mechanic along with advice this can be a leaky spot. He said Vaseline works in a pinch.

So it may not be a boost leak, but a suction leak behind the MAF...

[JamesF80m3]

Originally Posted by tomlong

Perhaps check the nipple for the vacuum line connection on the J-Pipe, which also connects to the Bank 1 intake located post MAF sensor to verify if it's completely seated & sealed? 🤷

Will get on it this weekend! Currently out of town for work