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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > I believe I just blew up my N54.



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      11-29-2015, 02:55 PM   #23
MachWon
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Guys... no need to argue here.

I calculated the E content wrong. I was in a hurry and forgot to add in the E10 for pump gas.

As for logs, nothing too recent but I should have one laying around. I was not logging like I should, I logged for a while but things seemed good so I just let it go.

Drove the car home today without too much issue. Started throwing a code for cyl 5 misfire. Throwing fuel out the exhaust. Sounded like a helicopter. Lol. Didn't really sound as if it was knocking, just missing like a mother.

I probably will not update again until I have news from a mechanic. I'm praying for the best but fully expect the worst. It's been fun guys!

Last edited by MachWon; 11-29-2015 at 03:04 PM..
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      11-29-2015, 03:40 PM   #24
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Expect an engine rebuild.
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      11-29-2015, 07:31 PM   #25
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Why people just throw shit on the car especially these aggressive tunes and think its all good is beyond me. Where were all the JB safeties to save it? Oh right they don't really do much to save the motors. This is becoming more and more of an occurance it seems in the last while and ut points to me to a couple of things including not logging and not working with someone knowledgable to build your tune. Why the hell would you run a JB these days anyways other than maybe gauges in map 4? Take that crap off the car and get mhd and a custom tune and log if you'll push!
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      11-29-2015, 07:36 PM   #26
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^What he said
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      11-29-2015, 08:38 PM   #27
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Quote:
Originally Posted by stari335 View Post
Why people just throw shit on the car especially these aggressive tunes and think its all good is beyond me. Where were all the JB safeties to save it? Oh right they don't really do much to save the motors. This is becoming more and more of an occurance it seems in the last while and ut points to me to a couple of things including not logging and not working with someone knowledgable to build your tune. Why the hell would you run a JB these days anyways other than maybe gauges in map 4? Take that crap off the car and get mhd and a custom tune and log if you'll push!
MHDs have had engine failures too. I'm not saying either one is better, but shit happens sometimes.
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      11-29-2015, 08:54 PM   #28
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Quote:
Originally Posted by stari335 View Post
Why people just throw shit on the car especially these aggressive tunes and think its all good is beyond me. Where were all the JB safeties to save it? Oh right they don't really do much to save the motors. This is becoming more and more of an occurance it seems in the last while and ut points to me to a couple of things including not logging and not working with someone knowledgable to build your tune. Why the hell would you run a JB these days anyways other than maybe gauges in map 4? Take that crap off the car and get mhd and a custom tune and log if you'll push!
Do you even realize when using a backend flash (like this guy and EVERYBODY running JB4 with E50 and up) the flash tune is doing EVERYTHING but boost control (which is absolute and more controllable as its not dependent on load tables). None of your safety points have any validity unless using the JB4 ONLY. With the backend flash its just a VERY GOOD boost controller whether a stock turbo car or 800whp single turbo car. Your safeties with the backend flash + JB4 are exactly the same with flash only (knock sensors, o2 sensors etc and DME controlled timing/fueling/limp mode adjustments). The only difference is the JB4 also throws you in MAP 4. There is nothing safer with flash only. There is NO tuner more capable or safety conscious than Terry (yes for flash tuning and N54 tuning overall) if you use HIS e85 backend flash with recommended hardware. A custom tune is only going to get more aggressive as the backend flashes aren't particularly aggressive. I haven't seen an OTS tune yet with timing and overall tables as sorted as the backend flashes (I copy or mimic a lot of his tables for my FLASH ONLY use). In other words if the car was running lean and the DME didn't do anything with JB4+backend flash it wouldn't have done a damn thing under the same conditions with flash only.

The problem is a 124k mile car smoking and burning a quart of oil every 1000 miles with admitted lack of monitoring (logging). How is a custom tune or flash only making this safer. Those issues needed to be sorted, car tuned back to stock and driven as little as possible until fixed.
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      11-29-2015, 08:59 PM   #29
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Quote:
Originally Posted by stari335 View Post
Why people just throw shit on the car especially these aggressive tunes and think its all good is beyond me. Where were all the JB safeties to save it? Oh right they don't really do much to save the motors. This is becoming more and more of an occurance it seems in the last while and ut points to me to a couple of things including not logging and not working with someone knowledgable to build your tune. Why the hell would you run a JB these days anyways other than maybe gauges in map 4? Take that crap off the car and get mhd and a custom tune and log if you'll push!
Lol. Shit happens regardless what tune you use, if you ignore your hardware. No amount of safety features will save you if you run super lean and have massive detonations.

If I were op, I would have stopped driving the car after the first failure. Hope the block is still repairable at this point, but I doubt it after he keeps on driving the thing. Probably best just get an used engine at point.
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      11-29-2015, 09:13 PM   #30
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If it ran super lean then a lean safety mechanism should've tripped and saved this engine. Otherwise why in the right mind would anyone keep running that garbage, no need for it at all.
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      11-29-2015, 09:27 PM   #31
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Quote:
Originally Posted by stari335 View Post
If it ran super lean then a lean safety mechanism should've tripped and saved this engine. Otherwise why in the right mind would anyone keep running that garbage, no need for it at all.
I thought mindless tune fanboy died out when Shiv left this platform years ago. Guess not...
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      11-29-2015, 11:17 PM   #32
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Quote:
Originally Posted by stari335 View Post
If it ran super lean then a lean safety mechanism should've tripped and saved this engine. Otherwise why in the right mind would anyone keep running that garbage, no need for it at all.
You're assuming a lean safety mechanism would've caught this in time to save the engine, if that's what even happened to OP at all.
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      11-30-2015, 08:09 AM   #33
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Quote:
Originally Posted by stari335 View Post
If it ran super lean then a lean safety mechanism should've tripped and saved this engine. Otherwise why in the right mind would anyone keep running that garbage, no need for it at all.
And what would be this lean safety mechanism that MHD and custom tuning would have kicked in?
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      11-30-2015, 09:00 AM   #34
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Lol at some people.

He could have been running a custom tune and still had this happen. The JB4 didnt cause this, his lack of monitoring his car, and fixing his outstanding issues caused this, along with him not paying attention to what e content he was filling up with.

The only thing JB4 did, was allow someone without enough knowledge or attention to detail to tune their car to the edge so easily.

no offense op

We have no info on what PSI OP was running at, what his boost failsafe was at, what his AFRs were, if he was using e70 or e85 or anything in between... So many variables that needed to be monitored that it sounds like werent. Also I have seen Map 7 target much higher than 19psi (21psi+) which could cause issues if youve got the wrong fuel.
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      11-30-2015, 10:09 AM   #35
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Sorry to hear about the damage OP. 120k is a lot of miles and map7 with the E85 flash is a pretty aggressive tune. It's 20psi and around 12.5 degrees of timing up top. If you were over boosting, running lean, etc, the JB4 would kick in but maybe it was just its time to go.
Definitely check out your logs if you have them to verify timing looks clean and AFR looks on target.

Mike
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      11-30-2015, 10:26 AM   #36
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Quote:
Originally Posted by stari335 View Post
If it ran super lean then a lean safety mechanism should've tripped and saved this engine. Otherwise why in the right mind would anyone keep running that garbage, no need for it at all.
The DME itself has no good run lean safety. It will let you run along at full boost with AFR at 18:1 in either bank without limping. I've seen it myself in logs. Whatever safety is built in to the DME is going to work the same whether or not a JB4 is installed. If the DME goes limp the JB4 does also. It's programmed that way.

The JB4 run lean safety will go to map4 if AFR goes leaner than 14:1 for more than a second, fuel pressure drops below 750psi for more than a second, etc.

Mike
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      11-30-2015, 11:53 AM   #37
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The car was hitting ~19.5 psi in the higher gears, 16-17.5 in 3rd. 14-15 in 1st and 2nd. Failsafe was at 20.5. I was running a custom flash put on with the MHD app. I have always been a tad under in boost and slow spool, could never find a boost leak so I thought it was just 120k mile turbos.

Latest log I can find, just over a month ago:
http://datazap.me/u/machwon/log-1448...4&mark=8-13-18

Enjoy!
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      11-30-2015, 11:56 AM   #38
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Quote:
Originally Posted by MachWon View Post
The car was hitting ~19.5 psi in the higher gears, 16-17.5 in 3rd. 14-15 in 1st and 2nd. Failsafe was at 20.5. I was running a custom flash put on with the MHD app. I have always been a tad under in boost and slow spool, could never find a boost leak so I thought it was just 120k mile turbos.

Latest log I can find, just over a month ago:
http://datazap.me/u/machwon/log-1448...4&mark=8-13-18

Enjoy!
bingo. your hpfp was done. logging and monitoring would've prevented this. fp_h should be at a value of 10 minimum, you were at 7. kinda weird your afrs aren't leaner
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      11-30-2015, 11:59 AM   #39
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Quote:
Originally Posted by MachWon View Post
The car was hitting ~19.5 psi in the higher gears, 16-17.5 in 3rd. 14-15 in 1st and 2nd. Failsafe was at 20.5. I was running a custom flash put on with the MHD app. I have always been a tad under in boost and slow spool, could never find a boost leak so I thought it was just 120k mile turbos.

Latest log I can find, just over a month ago:
http://datazap.me/u/machwon/log-1448...4&mark=8-13-18

Enjoy!
Your HPFP pressure is really low even at the mid range.... and I bet it will be even worse at higher rpm, which your log didn't capture.

Your AFR looks ok for this log, but I bet you blow your engine because of your failing fueling... Whoever looked at your log before and thought this is ok shouldn't be tuning...
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      11-30-2015, 12:02 PM   #40
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So HPFP gave and the car went lean. Mystery solved?
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      11-30-2015, 12:04 PM   #41
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Quote:
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So HPFP gave and the car went lean. Mystery solved?
HPFP didn't give. It is more or less running at and beyond the max designed capacity. You just happen to ignore the tell-tale signs of your fueling is not up to bar...
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      11-30-2015, 12:04 PM   #42
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So HPFP gave and the car went lean. Mystery solved?
Didn't necessarily "give out," you were just running too much ethanol for the pump to handle. I'm sure on pump gas it would've been fine. But yes, this is very likely the cause, weak hpfp + lots of e = lean.
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      11-30-2015, 12:07 PM   #43
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With fuel spitting out the exhaust this sounds more like an injector issue causing engine damage...
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      11-30-2015, 12:14 PM   #44
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My money was on injector too. I was getting ready to install new plugs because the car had a little hiccup at idle, but didn't get that far.
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