[MachWon]

I think I blew my N54 during a pull coming home from a car meet. I am by no means an expert when it comes to the technical side of cars, but there is definitely something wrong. Finished the pull, slowed down, and the car felt messed up. Rough sounding, stuttering, SES but no reduced power message on the iDrive. Pull over and the car is definitely misfiring. Pop the hood and immediately notice oil was blown through the filler cap back towards the firewall. The car was also smoking as if bad turbo seals, but nothing insane (couldn't tell what color because it was dark). Pull codes on JB4 and got a misfire code for cylinder 2 and a 02 lambda code. Car also sounds like it's knocking when standing beside it. I made ano executive decision to limp it another ~1 mile to a friend's house and it drove/sounded decent. Misfiring obviously but not really knocking lIke I thought it would be. Just sounded like a really loud lifter tick, and even then you had to actually listen to notice it.

Blown or nah? Thanks in advance guys.

Backstory on car:
2007 E90 335i 6mt
124k miles
Original turbos that smoke like crazy
1 qt oil every ~1000-1500 miles
(Depending on my driving habits)

JB4 Map 7 12.5 gallons E85 (w/ E60 flash)
Catless DP's
BMS intakes
Walbro 450
CP/BOV

[idrift4wd]

yup. record a video for better answer.

[WedgePerformance]

You just broke a piston and pressurized the crank case. Don't waist your money pulling things down, I've seen this before 1st hand. Pull the plugs, one will be wet with oil. Do a compression test on that cylinder and it won't have any compression. Sorry... It happens. Car-Part.com and find a good low mileage replacement motor.

[limitdown]

If it happened during a hard pull then its possible you blew a piston, bent a rod and/or blew a turbo.
If you're running meth, then a sudden cutoff in meth supply could have caused you to go massively lean, thereby blow a piston and/or bending a rod
Another potential could be a leaky injector that dumped in too much fuel into a cylinder and blowing that piston and rod.

The turbos might have been on its last leg due to mileage and age. A hard pull could have been the straw that broke the camel's back.

Since your existing turbos have been smoking badly already, I would check those first. Replacing those is less expensive than a full rebuild.

My indy is rebuilding my engine and replacing turbos right now. Car will be ready next Saturday. I'll be creating a thread on the process.

I also have a 2007 that is out of warranty. Needless to say, the car has been very expensive to upkeep. If I still lived back home in SoCal, I would have sold this car already and gotten an M4 with extended warranty (apologies in advance for talking about copping out). Too bad an M4 costs QUADRUPLE where I now live.... (not joking)

[sonic1]

Why are you running your car hard with smoking turbos that burn 1 qt of oil every 1k miles?

[Cloud9blue]

High ethanol mix on map 7 but with no port or throttle bottle injection or any other supplement fueling??? Sounds like you were running super lean and your piston finally went out.

[MachWon]

Thanks for the replies and suggestions guys. I had a bit of hope still because nothing "gave" during the pull.. it pulled hard until I let out. I didn't even know anything was wrong until I tried to give it gas. No radio on either. Oh well.

AFAIK, plenty of people have run E60 tunes without port/TBI..

[BlackBB6]

Do you have any logs on this tune, from before?

[Miller335]

Originally Posted by Cloud9blue

High ethanol mix on map 7 but with no port or throttle bottle injection or any other supplement fueling??? Sounds like you were running super lean and your piston finally went out.

Lol wut?

[Cloud9blue]

Originally Posted by MachWon

Thanks for the replies and suggestions guys. I had a bit of hope still because nothing "gave" during the pull.. it pulled hard until I let out. I didn't even know anything was wrong until I tried to give it gas. No radio on either. Oh well.

AFAIK, plenty of people have run E60 tunes without port/TBI..

Just because plenty of people do it doesn't mean it is a good idea.

It might be ok for some "glory runs" every once a while with logs to keep track of things. But running your hardware to the edge of failure on a daily basis is just asking for trouble.

[jtswole]

Post recent logs

[332ijunkie]

12.5 gal e85?

[stashtrey]

Happened to me a few months ago. Cracked #2 piston.

[stashtrey]

fwiw...I didn't have any oil leaking. Lots of smoke. Misfire #2. Mine also could have been metal fatigue. The piston held together and zero damage to cylinder. Just replaced the engine with a 50k unit found on car-part.com. $3750 + shipping.

[stanlalee]

Originally Posted by Cloud9blue

High ethanol mix on map 7 but with no port or throttle bottle injection or any other supplement fueling??? Sounds like you were running super lean and your piston finally went out.

If that's winter mix E85 its only about E55-60. He has Walbro 450 which equates to Fuel-it Stage 2 upgrade. What does Map 7 target?

I wouldn't assume anything in terms of damage. I have seen people here have blown symptoms and fixed it with replacing injectors and I have seen people with minor symptoms and severely damaged internals. Get a real in person diagnosis and go from there.

[Cloud9blue]

Originally Posted by stanlalee

If that's winter mix E85 its only about E55-60. He has Walbro 450 which equates to Fuel-it Stage 2 upgrade. What does Map 7 target?

19psi. Most car would start running out of fuel at 15-17 psi with high ethanol mix even with stage 2 lpfp.

[stanlalee]

Originally Posted by Cloud9blue

19psi. Most car would start running out of fuel at 15-17 psi with high ethanol mix even with stage 2 lpfp.

Are you certain about that? I haven't seen Terry or anybody recommend anything more than an in tank pump upgrade for E60 or less. I remember their stock turbo record when it was 450whp was with an inline walbro, E55 and like 21psi with no AFR issues. I know port/TB is recommended for greater than E60. Matter of fact I have seen virtually nobody use port injection or TB injection (still just beta testers as far as I know) for E60.

[jtswole]

Sounds like he was running e70 , and hpfp was tanking.

[Cloud9blue]

Originally Posted by stanlalee

Are you certain about that? I haven't seen Terry or anybody recommend anything more than an in tank pump upgrade for E60 or less. I remember their stock turbo record when it was 450whp was with an inline walbro, E55 and like 21psi with no AFR issues. I know port/TB is recommended for greater than E60. Matter of fact I have seen virtually nobody use port injection or TB injection (still just beta testers as far as I know) for E60.

Do you ever log bro?

Seriously, every car is different. If you want to run the hardware to its edge, that's fine. But you better keep track of it whenever you can to catch a failing injector or hpfp before it causes much bigger problem.

If you don't want to bother logging it after ever fill up, that's fine as well. But it is much safer to run with some safety margins.

It is hard to diagnose a blown engine over the Internet, so you are really on your own with this. But I would highly suggest running a more conservative setup next time if you already know your car isn't running 100%.

By the way, the OP was running 12.5 gal of e85 in our 16 gal tank. Depending on where he get the e85 from, that's way more than e50-60.

[jtswole]

Originally Posted by Cloud9blue

Do you ever log bro?

Seriously, every car is different. If you want to run the hardware to its edge, that's fine. But you better keep track of it whenever you can to catch a failing injector or hpfp before it causes much bigger problem.

If you don't want to bother logging it after ever fill up, that's fine as well. But it is much safer to run with some safety margins.

It is hard to diagnose a blown engine over the Internet, so you are really on your own with this. But I would highly suggest running a more conservative setup next time if you already know your car isn't running 100%.

By the way, the OP was running 12.5 gal of e85 in our 16 gal tank. Depending on where he get the e85 from, that's way more than e50-60.

It's e70

[stanlalee]

Originally Posted by Cloud9blue

Do you ever log bro?

Seriously, every car is different. If you want to run the hardware to its edge, that's fine. But you better keep track of it whenever you can to catch a failing injector or hpfp before it causes much bigger problem.

I have 10+ pages of logs on Datazap (and have a weak LPFP, what's your point). This ain't about me, I'm at 140k miles and running fine (for the most part lol). I also review virtually every log posted many of which are E50-E60 with low pressure fuel upgrades and have yet to see any trend of running lean (except those targeted too lean) or with high or low pressure tanking on E60 or less. If its out there why don't you show me your evidence instead of trying to be sly... as if we don't know every car is different. I have not seen ANY evidence of E60 typically maxing out stock turbos at 15-17psi via logs posted over the last several years.

By the way, the OP was running 12.5 gal of e85 in our 16 gal tank. Depending on where he get the e85 from, that's way more than e50-60.

Which is why I specified "IF" it was winter blend where E85 becomes E70 for most of the country. In that case it would be E57 mixed with E10 pump gas.

[Cloud9blue]

Originally Posted by stanlalee

I have 10+ pages of logs on Datazap (and have a weak LPFP, what's your point). This ain't about me, I'm at 140k miles and running fine (for the most part lol). I also review virtually every log posted many of which are E50-E60 with low pressure fuel upgrades and have yet to see any trend of running lean (except those targeted too lean) or with high or low pressure tanking on E60 or less. If its out there why don't you show me your evidence instead of trying to be sly... as if we don't know every car is different. I have not seen ANY evidence of E60 typically maxing out stock turbos at 15-17psi via logs posted over the last several years.

Which is why I specified "IF" it was winter blend where E85 becomes E70 for most of the country. In that case it would be E57 mixed with E10 pump gas.

I was writing to OP. Did your car blow up? No, so...

We can go on all day and speculate what happened. But only OP knows what really went on with his car at the end of the day.