[Sleeper340i]

Any feedback appreciated. I've been having trouble with a boost leak the last two months. Started off with popping that's disappeared a month after installing my high flow ER down pipe and AP intake. Car still ran great and fast otherwise, but now the last month or two boost has not been hitting target PSI by 3-4 psi, also feels a little bit slower.

I've re installed my intake (wasn't using a coupler before) and took my car to a highly rated local Indy shop. They ran a smoke test and also used an OBD2 scanner. Found my intake coupler was a little loose (not enough to cause the boost leak) and fixed that minor leak. They also found a bunch of codes with my car, mainly transmission, but once cleared and I came back a week later the codes have not returned. They said they couldn't find anything wrong with car to be causing a boost leak, but yet it is still not hitting target boost on MHD...

Debating on throwing my car on the dyno to see if I am trippin, getting used to the speed, or if my car is actually under boosting according to MHD. If not, my other solution is to take my down pipe off to see if my cats have melted, blocking the airflow, and if not that, then my last guess would be a bad turbo. I would much rather have added assurance of my gauges, showing that i'm hitting target PSI, then having a dyno though if possible.

Any thoughts?

I'll put a link a to my logs as well, if that helps at all

https://datazap.me/u/alfanzo2/340i-m...=2&data=4-6-22

[OzBMR]

Don't waste your money putting it on a dyno, it's not running as it should and making very low power, less than stock.

Your waste gate duty cycle is running nearly 100% all the time but it's struggling to get over 10 PSI. A stock 340i runs less than 80% WGDC.

Check all connections for sensors, MAF, TMAP, MAP etc if still no good I'd start by putting the stock intake back on, test again, then check out the down pipe, maybe put the stock one back on?

[G.Newt]

kern417 might be able to chime in better here when looking at load act. % vs load req. %

[jackstrath]

how aggressive was your pops? This does sound like another case of a cat collapsing tbh...

[Sleeper340i]

Originally Posted by OzBMR

Don't waste your money putting it on a dyno, it's not running as it should and making very low power, less than stock.

Your waste gate duty cycle is running nearly 100% all the time but it's struggling to get over 10 PSI. A stock 340i runs less than 80% WGDC.

Check all connections for sensors, MAF, TMAP, MAP etc if still no good I'd start by putting the stock intake back on, test again, then check out the down pipe, maybe put the stock one back on?

Appreciate you looking at the log. I’ve actually reinstalled the intake and cleaned the MAF sensor since this log, which was a few weeks back so hopefully my WGDC has climbed down since. As for the boost it’s averaging about 11.9 now. I’ll try to get a new log tonight to see if anything has improved.

As for the downpipe I’ll be checking that this weekend as I feel it could be the main culprit.

[Sleeper340i]

Originally Posted by jackstrath

how aggressive was your pops? This does sound like another case of a cat collapsing tbh...

I’m thinking so too... it was pretty aggressive. I did max setting on MHD which was pretty obnoxious, but when I added E30 into the mix the pops would get even crazier. Honestly thinking the E30 could have melted my cat on the high setting...it was not too long after when I started doing e30 is when it went downhill before it completely disappeared.

[Sleeper340i]

Originally Posted by G.Newt

kern417 might be able to chime in better here when looking at load act. % vs load req. %

Any help is appreciated, I’ll also grab a new updated log tonight to see if anything improved after cleaning the MAF and reinstalling intake with a coupler.

[eluded]

My stock 340 hits 14 to 15 psi.

[kern417]

Originally Posted by eluded

My stock 340 hits 14 to 15 psi.

With MPPSK? typically stock is ~10psi. (Target, not actual)


OP, the things I see

1 - You have a lot of timing corrections across all cylinders, particularly 1 & 6
2 - WGDC is high for the boost your making
3 - Load is low
4 - MAF, IAT, Fuel pressure, etc. all seem ok

My guess is you either have a damaged turbo/wastegate or potentially the cat issue you mentioned. It would be nice if you could log stft.

[Sleeper340i]

Originally Posted by kern417

With MPPSK? typically stock is ~10psi. (Target, not actual)


OP, the things I see

1 - You have a lot of timing corrections across all cylinders, particularly 1 & 6
2 - WGDC is high for the boost your making
3 - Load is low
4 - MAF, IAT, Fuel pressure, etc. all seem ok

My guess is you either have a damaged turbo/wastegate or potentially the cat issue you mentioned. It would be nice if you could log stft.

Hey Kern, thanks for the response. I’m glad you’re on the same page as me for what my problems are. I’m going to get my downpipe looked at this weekend and hopefully gutting my cat if faulty, will fix the problems. If not looks like a new VTT turbo is going to be purchased

As for the request for STFT, if I’m not mistaken should that automatically appear when looking at my logs? Regardless I’ll try to get a new log tonight. Nonstop rain in Seattle isn’t helping lol.

[kern417]

Originally Posted by Sleeper340i

Hey Kern, thanks for the response. I’m glad you’re on the same page as me for what my problems are. I’m going to get my downpipe looked at this weekend and hopefully gutting my cat if faulty, will fix the problems. If not looks like a new VTT turbo is going to be purchased

As for the request for STFT, if I’m not mistaken should that automatically appear when looking at my logs? Regardless I’ll try to get a new log tonight. Nonstop rain in Seattle isn’t helping lol.

I've seen it in some logs but not others. Check your log settings to see if you can check/uncheck parameters.

Take your time. I'm not even messing with logging in the weather we're having. I have a base map ready to flash from my tuner but conditions mean I'm waiting.

[Sleeper340i]

Hell yeah guys, found my boost leak!
I'll let the pics speak for themselves

[OzBMR]

Originally Posted by Sleeper340i

Hell yeah guys, found my boost leak!
I'll let the pics speak for themselves

Thanks for posting the follow up.

Should run better now.

[kern417]

I do not understand this problem. I've never seen cats fail at the rate they do with BMWs. But glad you got it figured out.

[B58 parts]

What the hell is that?

[Sleeper340i]

Originally Posted by OzBMR

Thanks for posting the follow up.

Should run better now.

Runs a million times better in every way, it's a whole different beast. Thanks for the help!

[Sleeper340i]

Originally Posted by kern417

I do not understand this problem. I've never seen cats fail at the rate they do with BMWs. But glad you got it figured out.

Yeah I'm not too sure either, you'd hope a 400-500 dollar cat would last longer than a month lol but thanks for your help!

Looking forward to using your SUPRA HPFP install vid whenever I decide to get off my ass and decide to install it. How long did it take you if you don't mind me asking?

[Sleeper340i]

Originally Posted by YuminNuman

What the hell is that?

It's a melted/molded 200 CEL catalytic converter lol.

[enemigo13]

peter from pure turbos melted aftermarket cat with pure stage2 turbo long time ago. These cheap cats are crap, while it's quite hard to melt stock one.

[Sleeper340i]

Originally Posted by enemigo13

peter from pure turbos melted aftermarket cat with pure stage2 turbo long time ago. These cheap cats are crap, while it's quite hard to melt stock one.

Do you know what cat/down pipe he was running? I would understand if it's a cheaper one like VRSF but my high flow cat itself costed about 4-5 hundred when you factor in the cost of a catless one. Expected a little better quality than one month use.

[enemigo13]

Originally Posted by Sleeper340i

Do you know what cat/down pipe he was running? I would understand if it's a cheaper one like VRSF but my high flow cat itself costed about 4-5 hundred when you factor in the cost of a catless one. Expected a little better quality than one month use.

don't remember but he's on this forum, now running M140i with pure800 turbo, search and you'll find.

[kern417]

Originally Posted by Sleeper340i

Yeah I'm not too sure either, you'd hope a 400-500 dollar cat would last longer than a month lol but thanks for your help!

Looking forward to using your SUPRA HPFP install vid whenever I decide to get off my ass and decide to install it. How long did it take you if you don't mind me asking?

way too long since i was trying to film and i'm an amateur. but realistically you could get it done in 1-2 hrs.

Originally Posted by Sleeper340i

Do you know what cat/down pipe he was running? I would understand if it's a cheaper one like VRSF but my high flow cat itself costed about 4-5 hundred when you factor in the cost of a catless one. Expected a little better quality than one month use.

peterm140