[pearlpower]

Nice drive home from work yesterday when from a light the car all of a sudden severely buckled back and forth and I experienced almost all loss of power. I keep a scanner (Foxwell BMW specific) and pulled codes, none.

Popped the hood, all coils were seated, aftermarket chargepipe appeared fine. No disconnected electrical. I was able to limp it 5 miles home at 10% throttle and it made it up to 55mph though it is very sensitive to too much or too little throttle, when it will buckle significantly like a mechanical bull.

Pulled codes again while at home, again, zero. No smoke, no odd smells.

Checked all plugs and they are darker than usual, flashed car back to stock, it will now idle whereas with BM3 would stall at times.

It behaves as if the TPS (I do not believe this car has one) is bad or fueling, original LPFP/HPFP at 60k miles, which I have been thinking of replacing anyhow for preventive, as FCP has them both shipped new for $430 2-day to my home.

2015 model so the fan relay issue would not apply. Fan is working fine. Oil has no fuel smell.

High flow cat is not glowing so I do not believe it is clogged.

While flashing the car in the garage where sounds are exaggerated , the humming from the LPFP did sound ‘off.’ Thinking it might be that.

This morning as the engine was cold it started right up which makes me believe the HPFP is OK. Newish battery which checks out with a battery tester.

Anyone have other thoughts?

I do have ISTA+, etc……Just, given how poorly it is running, one would surmise a code or two would be greeting me.

Crap, was going to work on the E92 M3 today, guess not……

[thejeremyman9]

Usually LPFP will throw a code but if it was something that affected the entire engine at once, LPFP seems more likely than coils/plugs/etc. Did you try unplugging the MAF to see if it made a difference? Usually a bad MAF wont have that dramatic of an impact though

[pearlpower]

Originally Posted by thejeremyman9

Usually LPFP will throw a code but if it was something that affected the entire engine at once, LPFP seems more likely than coils/plugs/etc. Did you try unplugging the MAF to see if it made a difference? Usually a bad MAF wont have that dramatic of an impact though

Thanks, yes, I did disconnect the MAF and it ran a bit worse. Now, the update is I reset the fuel pump module and it ran substantially better. Still very short on power, but I estimate it is around 70% total power now.

I am now getting a consistent 120308 error code - Charging pressure control too low. Nothing wrong with the charge pipe, intake, etc.

It falls flat when accelerating, even revs at idle though week, though again, much better.

I do have a LPFP on the way as I intended to do that anyhow. Thinking I go ahead and order up a control unit and also a diverter valve as I am sitting on the old one.

Nothing found with ISTA either.

[pearlpower]

Datalog from my drive earlier today. Fuel appears fine. No boost so leaning towards diverter valve.

I did a smoke test earlier, everything checked out just fine. So, no obvious boost leaks and this would not show on the smoke test.

https://www.bootmod3.net/log?id=64db...0b43a008d23467

Time to order a GFB DV.

[thejeremyman9]

Did you pressurize or just use smoke? Suppose it could be DV since WGDC is also essentially maxed with no boost. Or a WG issue. But DV failure is pretty rare. Fuel trims also go quite a bit negative at times.

[alohasurftoad]

Originally Posted by pearlpower

Time to order a GFB DV.

why not a turbosmart plumb back?

[Polo08816]

Originally Posted by pearlpower

Nice drive home from work yesterday when from a light the car all of a sudden severely buckled back and forth and I experienced almost all loss of power. I keep a scanner (Foxwell BMW specific) and pulled codes, none.

Popped the hood, all coils were seated, aftermarket chargepipe appeared fine. No disconnected electrical. I was able to limp it 5 miles home at 10% throttle and it made it up to 55mph though it is very sensitive to too much or too little throttle, when it will buckle significantly like a mechanical bull.

Pulled codes again while at home, again, zero. No smoke, no odd smells.

Checked all plugs and they are darker than usual, flashed car back to stock, it will now idle whereas with BM3 would stall at times.

It behaves as if the TPS (I do not believe this car has one) is bad or fueling, original LPFP/HPFP at 60k miles, which I have been thinking of replacing anyhow for preventive, as FCP has them both shipped new for $430 2-day to my home.

2015 model so the fan relay issue would not apply. Fan is working fine. Oil has no fuel smell.

High flow cat is not glowing so I do not believe it is clogged.

While flashing the car in the garage where sounds are exaggerated , the humming from the LPFP did sound ‘off.’ Thinking it might be that.

This morning as the engine was cold it started right up which makes me believe the HPFP is OK. Newish battery which checks out with a battery tester.

Anyone have other thoughts?

I do have ISTA+, etc……Just, given how poorly it is running, one would surmise a code or two would be greeting me.

Crap, was going to work on the E92 M3 today, guess not……

That's what I was thinking... unless a tune is suppressing those particular codes.

[n55david]

Originally Posted by pearlpower

Datalog from my drive earlier today. Fuel appears fine. No boost so leaning towards diverter valve.

I did a smoke test earlier, everything checked out just fine. So, no obvious boost leaks and this would not show on the smoke test.

https://www.bootmod3.net/log?id=64db...0b43a008d23467

Time to order a GFB DV.

No.. turbosmart or nothing

[pearlpower]

UPDATE: Bad turbo. Exhaust impeller is completely shot. Moves all over the place. Pieces laying on top of cat. Wonder if the aggressive burbles had anything to do with it. Only 61k miles. Time to review my options. But, at least I know what the problem is.

[pearlpower]

Anyone know if a F87 M2 turbo setup would work without issue with my 435I? Someone is selling one thus the question. I know it would fit, but do not want any surprises given how much a PITA it is to swap out.

[LA1Z24]

The normal M2 engine is an N55 just like the 435 engine. They are the same turbo. The M2 Comp should have an S55, which would be a twin turbo setup. It would require a lot of custom wiring and coding to make functional.

[thejeremyman9]

The S55 turbo setup is also completely different due to air/water IC etc. Its not just 2 turbos instead of one, its way more than that.

[pearlpower]

Originally Posted by LA1Z24

The normal M2 engine is an N55 just like the 435 engine. They are the same turbo. The M2 Comp should have an S55, which would be a twin turbo setup. It would require a lot of custom wiring and coding to make functional.

I ask as I noticed the 435i and M2 F87 N55 turbos are a different part #. Anyone know if the M2 turbo is part of the reason why it has 370hp?

Link to 435i turbo
https://www.bimmerworld.com/Exhaust/...57648913K.html

M2 turbo
https://www.bimmerworld.com/Exhaust/...xoClHoQAvD_BwE

[thejeremyman9]

Some people have always said that the M2 N55 turbofold is different, but that's never been confirmed. The M2 runs a different tune which is where the power comes from.

[pearlpower]

So far the M2 turbo appears to the same exact unit. I will mic it tomorrow. 4hrs to remove, likely 5hrs to install including oil change. It do not see any scoring on the intake compressor/housing.The compressor wheel and turbine are detached. While the compressor wheel is fine and spins, the turbine wobbles all over and has broken fins.

[Kjaerulff]

Sorry to hear you’re going through these issues.

One thing is of course getting the car back and running but I wonder what caused the turbo to fail. Would burbles really do that?

I have the same car so I was wondering what boost levels you were running with your tune?

[pearlpower]

Originally Posted by Kjaerulff

Sorry to hear you’re going through these issues.

One thing is of course getting the car back and running but I wonder what caused the turbo to fail. Would burbles really do that?

I have the same car so I was wondering what boost levels you were running with your tune?

Of course everything is conjecture. My tune setting had aggressive burbles on for around 5 seconds in Sport mode. I would say in my case, yes. Tune is BM3 91ACN with E30 once in a while. Was not running E30 when this happened.

But, the damage did occur when decelerating to stop, with the burbles. I will not run them going forward.

Swapping out a turbo on a N55 is a PITA. Likely will move on to a 440i or M340i in a few months.

[LuxoM3]

Honestly, I always wondered about the "pops and burbles" features on tunes - is it that the tune runs super rich and thus sends unburnt fuel into the exhaust (which includes the turbo) where it explodes to get the pop?

It would explain why the turbo is all trashed.

On the flip side, with detonation/pre-ignition - if I remember right, it's also fuel related, but too much air (lean mix) but in the intake cycle... causing mini explosions which was known to take out valves and spark electrodes and melted pistons.

[pearlpower]

Finally got around to finishing this up. The CTS inlet pipe is a tight fit. Started it up, went for a drive and multiple misfire codes. Reset, inspected, went out again it drove fine. I did get another CEL for the aftermarket Rein breather hose as the original snapped into several pieces. When I plug in the original plug or whats left of it the CEL goes away. Off to BMW to buy OEM. I get a whistle when I let off the gas, perhaps the DV+ DV. So far so good.

Installed the new OEM crankcase breather hose. Now have 70+ miles with no issues, no leaks. Replacement turbo from the M2 is fine. Will flash back the BM3 later.