N54 logs before rod bearing failure

[Velocity+]

Hi Guys,

I blew a rod bearing in my 2009 N54 135i AT a few months ago. I was running a Cobb Stage 1 FMIC aggressive map, then switched to their E30 race map before the failure. I was running an E30 mixed with CA 91 fuel on both maps but I only have a datalog when running the 1 FMIC aggressive map.

Could someone have look at my logs to see how the car was running?

datalog12.csv contains the most information.

Much appreciated in advance!

[Velocity+]

I wish I had a log when running the E30 map but sometimes we learn the hard way.

[ShocknAwe]

Either upload the log csv files individually or host them on datazap. I'd be happy to look at them but I'm not opening a zip file.

[Velocity+]

Thanks ShocknAwe. There's no option to upload csv files but I'll rename them to .log and upload them on Monday.

[Velocity+]

Here is the updated log, shared with Datazap

http://www.datazap.me/u/mspringer/co...=1&data=2-7-15

[bNks334]

Originally Posted by Velocity+

Here is the updated log, shared with Datazap

http://www.datazap.me/u/mspringer/co...=1&data=2-7-15

You would've needed to log oil temperature and oil pressure to have any idea if there might've been an oiling issue that caused bearings to run dry. Those logs aren't going to show anything.

An oil change should've showed the carnage, not a log lol

[Velocity+]

There were a lot of metal fragments in the oil after the failure. I was hoping that the log would reveal if the issue was definitely related to oiling. Could it have been running too lean? I was running E30 with the stock fuel system.

[Velocity+]

There was also gasoline in the oil, along with the metal fragments

[titium]

Originally Posted by Velocity+

There was also gasoline in the oil, along with the metal fragments

did you get it tested?

[Velocity+]

Originally Posted by titium

did you get it tested?

It didn't go to a lab for testing but it was my mechanic's diagnosis. He's a BMW tech.

[bNks334]

Originally Posted by Velocity+

It didn't go to a lab for testing but it was my mechanic's diagnosis. He's a BMW tech.

So google around for how you might be able to tell from a log if your injectors are leaking. I think the only way to of seen that though would've been to actively monitor AFR on bank 1 and bank 2 right to see how long AFR takes to settle to ~235 after lifting off the gas...

Doesn't matter now though, the engine is toast unless you can find a way to flush the bearing material out.

[Havocsteve]

Originally Posted by bNks334

So google around for how you might be able to tell from a log if your injectors are leaking. I think the only way to of seen that though would've been to actively monitor AFR on bank 1 and bank 2 right to see how long AFR takes to settle to ~235 after lifting off the gas...

Doesn't matter now though, the engine is toast unless you can find a way to flush the bearing material out.

Need to pull engine with turbos and everything. Full disassembly and cleaning and taking it apart so its just the block and you can clean it out and clean the head and such as well. Not a hard job really but takes a lot of time. Then just rebuild if needed or put the old parts back in all cleaned up and replace broken parts. I'm sure someone has done this but I'm thinking this would be a 10k job easy. I would put new parts in since it's already out and new gaskets ect..

[Velocity+]

Thanks for your input guys.

My mechanic has just installed a low mileage engine, with the latest index 12 injectors and it seems to be running fine. I guess, I just want to know if the log I posted could indicate that the tune I was running could have contributed to the failure.

Could a failed bearing only be caused by lubrication issues?

Also, I'm not enjoying driving the car as much as I'd like to with the stock tune. I would like to reload my Cobb OTS tune but I absolutely do not want to blow another engine.