[brandontoscano]

I need help reading a couple of logs I got earlier today. The car just had new stock replacement turbos installed. It feels like it's misfiring at WOT, and obviously feels a bit sluggish. The car also idles a bit rough, but in general runs pretty well with everyday driving. I am FBO and running a JB4 G4 15ohm board on Map 5.

Thanks

[AK 335i]

You are way over target boost... i would relog on map 2 just to see if you stay on target. if you do, then go back to map 5 and try again... Feels like misfiring because undoubtedly the jb4 is closing throttle partially due to the overboost.

Sources: we had the exact same prob last night on the ST with my car over boosting and then causing throttle cuts

The jb4 may have default thrown you into map 4 as a safety also... hard without the CSVs. anyway clear codes and re log on map 2 to see whats up

[brandontoscano]

Originally Posted by AK 335i

You are way over target boost... i would relog on map 2 just to see if you stay on target. if you do, then go back to map 5 and try again... Feels like misfiring because undoubtedly the jb4 is closing throttle partially due to the overboost.

Sources: we had the exact same prob last night on the ST with my car over boosting and then causing throttle cuts

The jb4 may have default thrown you into map 4 as a safety also... hard without the CSVs. anyway clear codes and re log on map 2 to see whats up

I noticed after my runs, it did throw me into map 4. I'll be sure to try map 2. Thanks for the input.

[Mike@N54Tuning.com]

I'd guess they screwed up your wastegate adjustment when installing the new turbos and made them too tight. You'll need to use the G5 ISO to try to mask it.

Mike

[AK 335i]

Originally Posted by Mike@N54Tuning.com

I'd guess they screwed up your wastegate adjustment when installing the new turbos and made them too tight. You'll need to use the G5 ISO to try to mask it.

Mike

True, That would be the next thing if resetting the codes and re logging and then readapting on map 5 doesnt work.

[brandontoscano]

Originally Posted by Mike@N54Tuning.com

I'd guess they screwed up your wastegate adjustment when installing the new turbos and made them too tight. You'll need to use the G5 ISO to try to mask it.

Mike

I was wondering this myself. But during my first few WOT pulls with the new turbos, the car felt really good. It ran very strong, and was smooth at WOT. But over the past couple days it feels way worse at WOT. So, I'm not sure if that would be it.

And I forgot to mention that on a couple WOT pulls yesterday, my SES light flashed once. I'm not sure if that's important.

[brandontoscano]

Originally Posted by sleepy415

I'm having a bit of the same problem, installed my JB4 last night on my stock N54 & ran Map 1. Did about 5 WOT pulls & it was completely fine, did another one & the car cuts off my throttle around 4.5k RPM's @ 2nd gear, then throws on a SES light and the car starts idling VERY rough shaking the car & it felt like I was driving over rumble strips. I parked the car, restart it & it's fine on Map 0 but WOT on Map 1 is giving me the same problems..& now my SES light is on everytime I start the car.

Yeah that sounds similar to mine, except I didn't have the extremely rough idle and shaking you had. I talked to Terry about my issue and he confirmed what the guys said above. My wastegates are way too tight and I need to run map 0 until I get the G5 board. I would email Terry your logs to have him see what is going on.