Very frustrating & challenging boost leak - Pure 2+

[heitzke]

I've been back to working on the car again here the last several weeks - had the Dorch, EU5's and PR stage 3 brushless pump installed and just started the process of getting retuned on ecutek vs. BM3.

All going super smooth until I started doing some logs and the car felt suuuper laggy, and then comes on super strong. Sent on a few logs and sure enough, i'm not building full boost until 5100-5200rpm vs the 4100-4200 it was prior.

Dropped the car back off to have a smoke test done and it's just billowing out of the front line on my aftermarket j-pipe. Cool, so I picked up a different j-pipe, passed the smoke test and figured I was all good.

Car is still just not building any boost. WGDC is super high until like 4500rpm and then it builds from there.

Also to note, when I picked the car up is was smoking HEAVILY and was noted that my back turbo was oily again on the backing plate when they did a wastegate adjustment. It smoked and smoked almost the whole way home and then eventually stopped.

At this point i'm kind of at a loss. I don't really know what to look for given the smoke and pressure testing everything yielded no results besides the j-pipe that was replaced.

What else should I be looking for here? Is one of the turbos dying and just not able to build boost appropriately?

[tomlong]

Perhaps if you could share your log so we can look at as many parameters as possible in order to help isolate variables.

[TopJimmy]

Many times it's that small air tube that runs from the long intake back to the J, and also down under the manifold to the throttle body. All these connections need to be greased well and then snapped together good. Then re-check that nothing can come loose.

[papasmurf_m3]

IDK why but, it appears pure turbos might have some QC issue. I've heard countless people say it smokes and they send it back, get a brand new and same issue.

Happened to a few people i know also. One guy went through 3 brand new stage 2 pluses.

[heitzke]

I'll get some stuff apart this weekend and check under the IM. Ended up replacing the hose from the intake to the j-pipe with a new OEM unit just in case too.

Good call on the log too, attached is my latest ecutek log. It's hard to parse through in this format tbh, but I also don't know what all of these values correlate to exactly. The basics, sure, but I don't know if I'm missing something.

Same with the Pures unfortunately. At this point it'll be my 3rd rear 2+ turbo and i'm really just over it. I kicked around going to a 4N single but think I might just go Mosselman. Should spool a little faster and have plenty of steam for a stock rotating assembly.

[aBMWfan]

Originally Posted by heitzke

I'll get some stuff apart this weekend and check under the IM. Ended up replacing the hose from the intake to the j-pipe with a new OEM unit just in case too.

Good call on the log too, attached is my latest ecutek log. It's hard to parse through in this format tbh, but I also don't know what all of these values correlate to exactly. The basics, sure, but I don't know if I'm missing something.

Same with the Pures unfortunately. At this point it'll be my 3rd rear 2+ turbo and i'm really just over it. I kicked around going to a 4N single but think I might just go Mosselman. Should spool a little faster and have plenty of steam for a stock rotating assembly.

I was in your predicament 3 years ago. I had issues with 2+. SSR couldn't figure it out. Complimentary rebuild at pure didn't fix it. So I want 4N single. Incredible change. Let me know if you need more information

[heitzke]

Originally Posted by aBMWfan

I was in your predicament 3 years ago. I had issues with 2+. SSR couldn't figure it out. Complimentary rebuild at pure didn't fix it. So I want 4N single. Incredible change. Let me know if you need more information

What sort of issues were you having with the 2+? The same stuff that i'm dealing with and boost issues, smoking, or both?

[aBMWfan]

Originally Posted by heitzke

What sort of issues were you having with the 2+? The same stuff that i'm dealing with and boost issues, smoking, or both?

Oscillations on boost.

Tbh I had version 1 2+ I haven't heard of these issues on Version 2 (since late 2020)

Pure is an awesome company though they really helped me out

[heitzke]

Originally Posted by aBMWfan

Oscillations on boost.

Tbh I had version 1 2+ I haven't heard of these issues on Version 2 (since late 2020)

Pure is an awesome company though they really helped me out

Ok gotcha. Yeah i've heard of the oscillation issues before too. I'm building boost in a pretty linear fashion, it just doesn't want to really start until 4k. Boost comes on strong whenever it finally does, it's just delayed for so long.

[aBMWfan]

Originally Posted by heitzke

Ok gotcha. Yeah i've heard of the oscillation issues before too. I'm building boost in a pretty linear fashion, it just doesn't want to really start until 4k. Boost comes on strong whenever it finally does, it's just delayed for so long.

Yeah sounds like your issue different , more like a boost leak.

Good luck and let us know your outcome.

[heitzke]

Originally Posted by aBMWfan

Yeah sounds like your issue different , more like a boost leak.

Good luck and let us know your outcome.

Yeah i'll dig in more this weekend and give everything a good once over. I'm especially curious about the line between the tb and intake manifold now since I can't get my eyes on that one.

[astris]

Damn Mike, you just can't catch a break! I don't have anything technical to add, but my car is going on the dyno next week and I'll definitely pass on my numbers with the Mosselman's. It's looking like the turbos are capable of making enough power to even surpass stock motor limits. Also, while I do like supporting forum vendors, buying direct from Mosselman is sooo much cheaper and faster. So I went that route.

Also I'm guessing you saw that 4N single Bend tuned at a conservative 720whp. So you can't really lose either way, just two very different price points.

[heitzke]

Originally Posted by astris

Damn Mike, you just can't catch a break! I don't have anything technical to add, but my car is going on the dyno next week and I'll definitely pass on my numbers with the Mosselman's. It's looking like the turbos are capable of making enough power to even surpass stock motor limits. Also, while I do like supporting forum vendors, buying direct from Mosselman is sooo much cheaper and faster. So I went that route.

Also I'm guessing you saw that 4N single Bend tuned at a conservative 720whp. So you can't really lose either way, just two very different price points.

Haha don't I know it. These Pure turbos have been the bane of my existence lol. Mosselman direct is backordered at the moment but I thiiiink I found another vendor that had them stocked. Even if they have to order them for me their pricing was hard to beat.

I talked myself out of the 4N kit after really pricing it out more fully and it was just too tough to swallow even though it'd be SO cool to do. Starting from scratch i'd totally do a single, but here I am and think the Mosselman will do the trick for what I want from them.

Lookin forward to seeing what you put down! With your 60-130's you're definitely making some solid power.

[andrei.m4]

buy littco l640 or l700, the advantage of l640 is very fast boost, 700-800rpm earyler than stock turbos!!!

[heitzke]

Quick update: took all the charge pipes, intakes, adjusted the j-pipe and checked all the lines I could get a visual on. I couldn't quite see a line that goes under the intake manifold, so maybe that's something I still need to do.

All yielded no difference. Visually inspected all pipes, connectors, o-rings, etc and all looks totally normal to me. I seriously have no idea why this thing isn't building boost normally. Logs were the same deal - WGDC is pinned to 100% until like 4.2k and then they crack open and it builds up to peak boost 1k rpm later.

It's just totally dead whenever you first tip into the throttle

[Commanderwiggin]

Originally Posted by heitzke

Quick update: took all the charge pipes, intakes, adjusted the j-pipe and checked all the lines I could get a visual on. I couldn't quite see a line that goes under the intake manifold, so maybe that's something I still need to do.

All yielded no difference. Visually inspected all pipes, connectors, o-rings, etc and all looks totally normal to me. I seriously have no idea why this thing isn't building boost normally. Logs were the same deal - WGDC is pinned to 100% until like 4.2k and then they crack open and it builds up to peak boost 1k rpm later.

It's just totally dead whenever you first tip into the throttle

Probably a turbo issue…wastegate needs to be checked during install to see if it closes all the way during the TIS procedure. Otherwise the rotor or blades damaged. If she's smoking…they gone.

[heitzke]

Originally Posted by Commanderwiggin

Probably a turbo issue…wastegate needs to be checked during install to see if it closes all the way during the TIS procedure. Otherwise the rotor or blades damaged. If she's smoking…they gone.

I haven't seen it smoking since the day that I picked it up, but I suspect it'll go the way it did last time and progressively become more frequent; especially if it sits for a while. I've probably been driving it too much again for it to smoke more.

I just don't understand the logs. Rolling into the throttle at like 3k the WGDC is fine, i'm hitting boost targets and then as i'm in the 4200ish range the WGDC rolls up to 100%, i'm waaay off on boost for another 1000rpm or so before it catches up.

[heitzke]

So I went through the hassle of flashing back to BM3 to eliminate any tuning as a variable. It was nice to definitively say it wasn't the issue because I definitely had some skeptics, but I knew it wasn't really the problem here.

Generally a smooth process but now I've gotta deal with getting flash points put back on the ecutek dongle, etc etc and get back to where I was.

Here are a couple BM3 logs of the setup for anyone interested:

https://www.bootmod3.net/log?id=631e...90c69a0b812400
https://www.bootmod3.net/log?id=631e...90c69d7d3540ae
https://www.bootmod3.net/log?id=631e...0b4376d45fcacc

One thing of note is check how wildly different the MAF readings are. I guess this is maybe part of how they're making the EU5's work? Not really sure what to make of that, but otherwise I can see a bunch of boost deviation and super linear boost curves.

Otherwise I took it fairly easy in the logs and didn't want to hammer on something that's obviously having some issues.

[Commanderwiggin]

Originally Posted by heitzke

So I went through the hassle of flashing back to BM3 to eliminate any tuning as a variable. It was nice to definitively say it wasn't the issue because I definitely had some skeptics, but I knew it wasn't really the problem here.

Generally a smooth process but now I've gotta deal with getting flash points put back on the ecutek dongle, etc etc and get back to where I was.

Here are a couple BM3 logs of the setup for anyone interested:

https://www.bootmod3.net/log?id=631e...90c69a0b812400
https://www.bootmod3.net/log?id=631e...90c69d7d3540ae
https://www.bootmod3.net/log?id=631e...0b4376d45fcacc

One thing of note is check how wildly different the MAF readings are. I guess this is maybe part of how they're making the EU5's work? Not really sure what to make of that, but otherwise I can see a bunch of boost deviation and super linear boost curves.

Otherwise I took it fairly easy in the logs and didn't want to hammer on something that's obviously having some issues.

Yup definitely still a boost leak/turbo issue, one thing I noticed is look how far off Lambda's are with the EU5 selected in your tune now. Seems like the BM3 toggle for EU5's isn't correct like I've heard from others as well.

[RSXDC5]

If the various clamps from the charge pipes to the j-pipe are tight and the turbo inlets are placed correctly, then imho it's the j-pipe vacuum line…if u can slide it off it's not sealing, I use zip ties cross wrapped through that line's clamp and around the j-pipe.

I am about to install a j-pipe upgrade to the DO88 piece…it's a cast 3.3in vs the 3.0in we usually get from vendors.

[heitzke]

Originally Posted by RSXDC5

If the various clamps from the charge pipes to the j-pipe are tight and the turbo inlets are placed correctly, then imho it's the j-pipe vacuum line…if u can slide it off it's not sealing, I use zip ties cross wrapped through that line's clamp and around the j-pipe.

I am about to install a j-pipe upgrade to the DO88 piece…it's a cast 3.3in vs the 3.0in we usually get from vendors.

Definitely was the line initially. Replaced that vacuum line with a new one and then it still leaked on the CTS J-pipe, but didn't leak on the Evolution Racewerks (quite a nice piece tbh) and also a cast unit.

I'm wondering if it's with the IM since that had to come off in order to do the Dorch kit. Maybe something didn't seal back up as required.

[RSXDC5]

Originally Posted by heitzke

Definitely was the line initially. Replaced that vacuum line with a new one and then it still leaked on the CTS J-pipe, but didn't leak on the Evolution Racewerks (quite a nice piece tbh) and also a cast unit.

I'm wondering if it's with the IM since that had to come off in order to do the Dorch kit. Maybe something didn't seal back up as required.

I didn't want to throw CTS under the bus, but yes my fitment woes were also from CTS. The DO88 j-pipe is about $150 and cast, fitment will be flawless. Actually, considering getting the j-pipe 3d printed in Ti!

You could be right on the IM angle…did a shop do this install for you? If so, maybe they can make it right.