[Siowroc]

Hello, so after hard pull (launch control) on warm day (25'C) car started choking between 2/3 gear, then it was working like a tractor.
I've read the codes here is the 1st result :

View post on imgur.com

and here is the log this pull : https://datazap.me/u/socialpatrickk/...og=0&data=3-17

after this i've cleared the codes and run engine again :

View post on imgur.com

I was trying to get some info what can i do to do some more diagnostic from my site.
So i flashed to stock map via mhd at the morning, then read the codes again, here is the errors codes :

View post on imgur.com

So finally i decided to load the custom map from tuner and after that there was no issues, no error codes, i did the test run with few pulls but without lunch control and the car was seems fine but if someone experienced could looks for the logs and error codes, should i check any engine parts ?
here is the mods of car 435xi
- intercooler moded
- chargepipe moded
- whole exhaust with sport cat
- tmap sensor 3.5
- upgraded hpff (b58)
- coils
- Main Bearings crankshaft sport
- hybrid turbo
- xhp stage 3
- timing chain new

[n55david]

On my phone and just woke up. But without looking at that log I bet you had a fuel pressure drop.

[AmuroRay]

Originally Posted by n55david

On my phone and just woke up. But without looking at that log I bet you had a fuel pressure drop.

Nope, it looks fine from the log. Looks like something else - MAF or sensor issue. Hopefully OP isn't using the stock airbox. OP are you tuned for the 3.5 Tmap?

[johnung]

Originally Posted by AmuroRay

Nope, it looks fine from the log. Looks like something else - MAF or sensor issue. Hopefully OP isn't using the stock airbox. OP are you tuned for the 3.5 Tmap?

OP's setup would definitely be choking for more air without an upgraded Turbo Inlet Pipe such as an MST V2, and a minimum of a modified airbox with a high flow aFe air filter. (Or an MST Intake with its upgraded air filter)

[Siowroc]

Originally Posted by AmuroRay

Nope, it looks fine from the log. Looks like something else - MAF or sensor issue. Hopefully OP isn't using the stock airbox. OP are you tuned for the 3.5 Tmap?

shiet u got me, i thought this thing will need only better filter
i'm going to order custom setup right now

[n55david]

Originally Posted by Siowroc

shiet u got me, i thought this thing will need only better filter
i'm going to order custom setup right now

Yeah, inlet and intake are a must

[yupetc]

I have very similar symptoms, subscribed to see what you may find on yours.

Mine does the same thing, it pulls hard throughout the rpms, but upon boost level around 13psi or beyond, it has a slight fish-bite jerk and power is immediately slacked. Watched fuel rail pressure as this was going down, it stayed at 2900psi and maybe only dropped lowest to 2500psi, I wouldn't call that a bad drop. Mine also ends up with multiple misfires with cylinder 6's fuel being cut. I've checked my charged joints 3-times already (each time I remove the whole front end just so I can really get a full reach to the whole charged pipe assembly.) I'm on MHD stage 1 right now and it's tolerable enough; but once I put it on stage 2 or plus, it'll start missing and cut down to limp mode after 13psi boost. I've just bought a boost leak tester, will perform the test this weekend. Smoke test won't reveal anything since it only runs at 1-2psi.

I'm pretty much FBO with MHD's superpack. Don't know how to log yet, but if I can't locate the boost leak this week, I'll also be posting a log out here for you folks to also look at.

BTW, on this issue, so far, just out of safety, I've replaced: new throttle body, new gas recirc vent valve, new vacuum line, new ccv heater hose, 3.5bar MAP, MAF, 1-step colder spark plugs, ignition coils, re-pattern all injector spray, cylinder 6's injector port is re-sleeved.

One suspicion I have is, if the crankcase ventilation gets bad in the valvecover, could that be a point affecting my max boost? I did read in the N55 Engine PDF that the valvecover has its built-in crankcase ventilation system to manage engine block pressure and blow-by. There are a bunch of non-return valves and a pressure regulator valve built-in. Does anyone know if any of these go bad, can they affect whether or how well we can reach max boost?

I'm asking this because prior to seeing the repeated cylinder 6 misfire and fuel cut off, the car was running just fine; able to reach 15-16 psi boost on MHD stage 2, don't know why it didn't make it to 18psi, but while it was running fine without any misfire at 15-16psi, I was all over town zig-zagging through traffic with it. Then few weeks into this, one of times I really needed the pep, I floored the pedal hard and while the car was accelerating and passing the vehicle in front of me, a fish-bite jerk occurred, then lost power, then limp mode, with bunch of warning lights on the dash. You all know how that goes. I used carly to reset the vehicle, then use MHD to flash back to stock tune, and car's been driving just fine. But since then, every time I put it on MHD stage 2 or more, it'll cut out at 13-14 psi or so. Gonna try to officially run a boost leak test by inputting an increasing pressure at the turbo inlet and see if I get the infamous boost leak.

[designatedposter]

multiple misfires put you into limp mode by disabling some of the injectors, that's why it was like a tractor. the misfire was due to your hpfp not being able to keep up.

it's in the log at gear 2, 6200 rpm, your hpfp drops to 1600psi with a request of 2500psi.

[designatedposter]

also, i don't know what everyone else is seeing about his stock intake being an issue.

those boost pressure codes likely because he is on 3.5 bar TMAP and running stock tune (which expects the stock 2.5bar TMAP)

[designatedposter]

also, which b58 hpfp do you have? the gen1 is barely any more fuel volume than stock. so it's very likely to be running out of fuel with a hybrid turbo at 18 psi. the b58tu is the pump that everyone talks about and has a noticable increase in fuel volme.

[thejeremyman9]

Originally Posted by designatedposter

multiple misfires put you into limp mode by disabling some of the injectors, that's why it was like a tractor. the misfire was due to your hpfp not being able to keep up.

it's in the log at gear 2, 6200 rpm, your hpfp drops to 1600psi with a request of 2500psi.

Agree with the HPFP dip, it drops by about 1000 psi. Although not a full crash, could be one source of the problems.

I also don't know why everyone is talking about an intake. An inlet will be beneficial for sure, but people make 500whp no problem on stock intake. Swapping the intake is NOT going to solve the problem in OP.

[thejeremyman9]

Originally Posted by yupetc

I have very similar symptoms, subscribed to see what you may find on yours.

Mine does the same thing, it pulls hard throughout the rpms, but upon boost level around 13psi or beyond, it has a slight fish-bite jerk and power is immediately slacked. Watched fuel rail pressure as this was going down, it stayed at 2900psi and maybe only dropped lowest to 2500psi, I wouldn't call that a bad drop. Mine also ends up with multiple misfires with cylinder 6's fuel being cut. I've checked my charged joints 3-times already (each time I remove the whole front end just so I can really get a full reach to the whole charged pipe assembly.) I'm on MHD stage 1 right now and it's tolerable enough; but once I put it on stage 2 or plus, it'll start missing and cut down to limp mode after 13psi boost. I've just bought a boost leak tester, will perform the test this weekend. Smoke test won't reveal anything since it only runs at 1-2psi.

I'm pretty much FBO with MHD's superpack. Don't know how to log yet, but if I can't locate the boost leak this week, I'll also be posting a log out here for you folks to also look at.

BTW, on this issue, so far, just out of safety, I've replaced: new throttle body, new gas recirc vent valve, new vacuum line, new ccv heater hose, 3.5bar MAP, MAF, 1-step colder spark plugs, ignition coils, re-pattern all injector spray, cylinder 6's injector port is re-sleeved.

One suspicion I have is, if the crankcase ventilation gets bad in the valvecover, could that be a point affecting my max boost? I did read in the N55 Engine PDF that the valvecover has its built-in crankcase ventilation system to manage engine block pressure and blow-by. There are a bunch of non-return valves and a pressure regulator valve built-in. Does anyone know if any of these go bad, can they affect whether or how well we can reach max boost?

I'm asking this because prior to seeing the repeated cylinder 6 misfire and fuel cut off, the car was running just fine; able to reach 15-16 psi boost on MHD stage 2, don't know why it didn't make it to 18psi, but while it was running fine without any misfire at 15-16psi, I was all over town zig-zagging through traffic with it. Then few weeks into this, one of times I really needed the pep, I floored the pedal hard and while the car was accelerating and passing the vehicle in front of me, a fish-bite jerk occurred, then lost power, then limp mode, with bunch of warning lights on the dash. You all know how that goes. I used carly to reset the vehicle, then use MHD to flash back to stock tune, and car's been driving just fine. But since then, every time I put it on MHD stage 2 or more, it'll cut out at 13-14 psi or so. Gonna try to officially run a boost leak test by inputting an increasing pressure at the turbo inlet and see if I get the infamous boost leak.

Did you swap plug and coil from cyl 6 to another cylinder? What does do you get? Also, you want stock plugs...

[AmuroRay]

Originally Posted by designatedposter

multiple misfires put you into limp mode by disabling some of the injectors, that's why it was like a tractor. the misfire was due to your hpfp not being able to keep up.

it's in the log at gear 2, 6200 rpm, your hpfp drops to 1600psi with a request of 2500psi.

Was it a misfire? His boost just drops off like a rock, it looks like an overboost.

Originally Posted by designatedposter

also, i don't know what everyone else is seeing about his stock intake being an issue.

those boost pressure codes likely because he is on 3.5 bar TMAP and running stock tune (which expects the stock 2.5bar TMAP)

It's just an issue with flow, nothing to do with what he's seeing here - but I did ask about his TMAP, and didn't receive an answer.

Originally Posted by designatedposter

also, which b58 hpfp do you have? the gen1 is barely any more fuel volume than stock. so it's very likely to be running out of fuel with a hybrid turbo at 18 psi. the b58tu is the pump that everyone talks about and has a noticable increase in fuel volme.

Also we don't know if its the B58 or TU pump - or what mix he's running.

[yupetc]

Originally Posted by thejeremyman9

Did you swap plug and coil from cyl 6 to another cylinder? What does do you get? Also, you want stock plugs...

Yes, swapped plug and coil locations, same result. Also swapped injectors locations, coded them in with ISTA, same result. Have tried stock plugs, too, same result. In fact, stock plugs are where this issue happened, I've since migrated to 1-step. But can go back to stock any time. FYI, mine's an engine rebuilt by myself. I spent 6 months building the motor with forged internal parts, too. Took 4 sets of different bearing shells to get to the clearance I wanted, and I got the bearings with CALICO coating, both rod and crank shells.



Let's route back, though it seems like my issue is taking over the OP's, I believe we may have the same or similar issues. And it seems like I've tested everything except for a high boost (20-30psi) pressure leak test through the turbo inlet, or maybe if a leaky diagram in the crankcase CCV could be causing a boost leak at beyond 13-14psi range.

[designatedposter]

Originally Posted by AmuroRay

Was it a misfire? His boost just drops off like a rock, it looks like an overboost.


It's just an issue with flow, nothing to do with what he's seeing here - but I did ask about his TMAP, and didn't receive an answer.



Also we don't know if its the B58 or TU pump - or what mix he's running.

his screenshots of DME errors shows multiple misfires and fuel injector shutoff

[AmuroRay]

Originally Posted by designatedposter

his screenshots of DME errors shows multiple misfires and fuel injector shutoff

But that doesn’t mean it occurred on this run. His rail pressure dipped and mine has on the stock pump on pump gas, but it didn’t cause a misfire. I’m thinking it’s an isssue with a MAF/MAP at least. yupetc probably could be a valve cover issue, good news is they are cheap on rockauto.

[thejeremyman9]

Originally Posted by yupetc

Yes, swapped plug and coil locations, same result. Also swapped injectors locations, coded them in with ISTA, same result. Have tried stock plugs, too, same result. In fact, stock plugs are where this issue happened, I've since migrated to 1-step. But can go back to stock any time. FYI, mine's an engine rebuilt by myself. I spent 6 months building the motor with forged internal parts, too. Took 4 sets of different bearing shells to get to the clearance I wanted, and I got the bearings with CALICO coating, both rod and crank shells.



Let's route back, though it seems like my issue is taking over the OP's, I believe we may have the same or similar issues. And it seems like I've tested everything except for a high boost (20-30psi) pressure leak test through the turbo inlet, or maybe if a leaky diagram in the crankcase CCV could be causing a boost leak at beyond 13-14psi range.

If i read your post correctly, its not that you cant build boost past 13-14psi, its that the car "cuts out" or has issues when the boost gets higher? Thats probably not a boost leak, especially if you are getting cylinder 6 specific midfire codes.

Did you compression/leakdown test cyl 6?

[n55david]

Wait so.. there was a pressure drop like I said there would be?

[thejeremyman9]

Originally Posted by n55david

Wait so.. there was a pressure drop like I said there would be?

OP had about 1k drop in HPFP pressure, but it wasnt a full "Crash" it looked like, so hard to say if thats the only issue.

[Siowroc]

Originally Posted by designatedposter

multiple misfires put you into limp mode by disabling some of the injectors, that's why it was like a tractor. the misfire was due to your hpfp not being able to keep up.

it's in the log at gear 2, 6200 rpm, your hpfp drops to 1600psi with a request of 2500psi.

i don't run on stock tune, guy named Khac Phuong Vu did the custom tune for 100 oct with the setup above, on mhd i have check'd tmap sensor 3.5 and xdi pump 1/2 as he said.

edit : the pull after the car started chocking was on the same map, so the chronology was
custom map with custom settings via mhd pull -> issue with tractor -> clear codes -> back to stock map -> few issues from codes above on stock -> custom map with custom settings -> no issues with codes
i didnt pulled yet car after this but im pretty sure it might be the same result, i will test very soon.

[yupetc]

Originally Posted by thejeremyman9

If i read your post correctly, its not that you cant build boost past 13-14psi, its that the car "cuts out" or has issues when the boost gets higher? Thats probably not a boost leak, especially if you are getting cylinder 6 specific midfire codes.

Did you compression/leakdown test cyl 6?

Yes, compression are all pretty even at around 200 psi when I first got the motor built. Leak down was less than 1% across all valves after two weeks; did this while I had the head rebuilt and was able to perform it upside down. But that doesn't mean it won't change for today. I'll be doing the boost leak test soon. And if I don't find anything, I'll at least try a compression test and see what happens.

I must maintain that it was running find with boost before, but something happened during one very demanding drive and now it won't drive correctly past 13-14psi. I still believe boost leak is likely since I have Wagner FMIC, FTP TIC and VRSF CP. I really believe there has to be a bad joint somewhere and ever since that bad event, it's never the same again.

[thejeremyman9]

Originally Posted by yupetc

Yes, compression are all pretty even at around 200 psi when I first got the motor built. Leak down was less than 1% across all valves after two weeks; did this while I had the head rebuilt and was able to perform it upside down. But that doesn't mean it won't change for today. I'll be doing the boost leak test soon. And if I don't find anything, I'll at least try a compression test and see what happens.

I must maintain that it was running find with boost before, but something happened during one very demanding drive and now it won't drive correctly past 13-14psi. I still believe boost leak is likely since I have Wagner FMIC, FTP TIC and VRSF CP. I really believe there has to be a bad joint somewhere and ever since that bad event, it's never the same again.

Just to clarify what i mean:

Wont build boost past 13-14 psi --> boost leak could be the reason

builds boost past 13-14 psi but doesnt run right when it does --> much less likely boost leak is the reason