Very frustrating & challenging boost leak - Pure 2+

[heitzke]

Originally Posted by RSXDC5

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.

DO88 Seems to make some really nice stuff. Yeah I retracted the brand earlier in the thread but forgot. Hate throwing names around when there are so many variables but the thing just didn't seal right.

The shop thinks the rear turbo may be having issues at this point. Bend was generally pointing the same direction too and it either being the turbo itself or the wg.

I ordered some Mosselman turbos that are supposed to be here in a few weeks, so I guess we'll see. With the rear Pure 2+ being oily on the backing plate again, I'd like to just bite the bullet and swap them out entirely vs. trying to use them again.

[heitzke]

Long overdue update but I just picked the car up last night with the Mosselman turbos. They were really backed up on production (which, good! i'm happy for them) and got them in earlier this week. Fast turnaround from the shop for sure.

I wish I had a more definitive answer here on the how/why, but swapping out the Pures and OEM actuators for the Mosselman w/ new actuators totally solved my issues building boost. Can I absolutely say that the issue is something with the turbos? Not.. really... but I do have them in my trunk right now so I'll poke at them over the weekend and see if something seems awry.

Given that i've had issues with the Pures before, is it plausible that it's a physical issue with a turbo? Sure.

[Track/S]

Check axial movement of turbine wheel very important

[Bassmaster]

Im on the fence between the Pure and Mosselman turbos... I will be really interested in your performance analysis vs each other. Do they really spool 1000 rpm quicker and hold the power... Fitment, Finish, etc etc...Thanks.

[heitzke]

I've been really impressed with the Mosselman units thus far (very short window, admittedly). I'll dig through some old logs with the Pure 2+ when I was on BM3 and compare spool time to the Mosseleman.

Not at all apples to apples because my Mosselman logs have been starting at 2k but for reference:

Pure:
3rd gear WOT at 3200 rpm

3200 - 6psi
3400 - 9psi
3600 - 11psi
3800 - 15psi
4000 - 19psi
4250 - 23psi
4576 - 25psi

Mosselman:
4th gear WOT at 2040 rpm

2000 - 3psi
2200 - 6psi
2400 - 10psi
2600 - 14psi
2800 - 19psi
3100 - 25psi
3300 - 29psi
3474 - 31psi

I'll grab some Mosselman logs starting in the lower 3k range and see what we're looking at. The other main factor that's going to make it a little hard to compare are tuning differences. My current tune has the boost targets more slowly ramp up than the BM3 tune that was more "full send the boost". That being said, i'll see what they look like.

[Bassmaster]

Just looking at the boost logs.. it appears that the pure turbos are larger… so comparing power at the the same pressure would be interesting. Also do the mosselman power fall off in the top end or hold? Building boost 1000 rpm sooner is huge! If ur not giving much up on upper Rpm range

[Track/S]

Originally Posted by Bassmaster

Just looking at the boost logs.. it appears that the pure turbos are larger… so comparing power at the the same pressure would be interesting. Also do the mosselman power fall off in the top end or hold? Building boost 1000 rpm sooner is huge! If ur not giving much up on upper Rpm range

That they are big does not mean that they give more power, basically because many times some touch things that should not be touched. for example the s55 turbos the maximum exducer that they admit in the exhaust is 45mm, then each one uses the compressor wheel of different sizes, pure, tte in their 8XXXX hp versions they use very large compressor wheels and that makes the turbo have a lot of lag , in the case of TTE they also modify something that they should not modify.
Perfect turbo from my point of view is the same size of exducer in turbine wheel as the inducer of the compressor wheel.

Mosselman has nothing new, in fact they use very old turbine wheels, today no company uses those wheels.

With BM3 stage2H you will have almost identical power regardless of the brand, only some will be faster spool

[heitzke]

Few more logs to look over.

Mosselman: 3rd WOT at 3900
3900 - 19psi
4000 - 21psi
4100 - 25psi
4200 - 27psi
4300 - 28psi
4600 - 31psi

Pure: 3rd WOT at 3900
3900 - 2psi
4000 - 7psi
4100 - 10psi
4200 - 14psi
4300 - 17psi
4400 - 21psi
4500 - 24psi
4800 - 26psi

Pure: WOT at 4200
4200 - 15psi
4300 - 17psi
4400 - 20psi
4500 - 22psi
4600 - 24psi
4700 - 25psi

Not sure what to think of the 2psi on the Pure log, but that's when the throttle was 100% so that's what i'm going with. The Mosselman were building good boost part-throttle before 100% WOT.

[ALCOBENDAS]

Originally Posted by Prodrive_X

That they are big does not mean that they give more power, basically because many times some touch things that should not be touched. for example the s55 turbos the maximum exducer that they admit in the exhaust is 45mm, then each one uses the compressor wheel of different sizes, pure, tte in their 8XXXX hp versions they use very large compressor wheels and that makes the turbo have a lot of lag , in the case of TTE they also modify something that they should not modify.
Perfect turbo from my point of view is the same size of exducer in turbine wheel as the inducer of the compressor wheel.

Mosselman has nothing new, in fact they use very old turbine wheels, today no company uses those wheels.

With BM3 stage2H you will have almost identical power regardless of the brand, only some will be faster spool

More info TTE please.. the big is 740+

[M2_MEDUSA]

I wanna go mosselman but just being on their website the 21% VAT TAX is absolutely ridiculous. Cant ever see myself paying 21% tax.

[heitzke]

Originally Posted by SpecialEdition_F87

I wanna go mosselman but just being on their website the 21% VAT TAX is absolutely ridiculous. Cant ever see myself paying 21% tax.

I definitely didn't pay that and there are several vendors you can source the Mosselman from

[M2_MEDUSA]

Originally Posted by heitzke

I definitely didn't pay that and there are several vendors you can source the Mosselman from

Could you please tell me which vendor to source that you recommend. Thanks

[Commanderwiggin]

VAT is only for Europe

[heitzke]

Took a quick video of the axial shaft play I'm finding in the front turbo. https://www.youtube.com/shorts/3loX0jQIVoU

Rear turbo seems fine and the side to side play of the wheels seems appropriate. The axial play with the associated clunking noise however... does not.

I reached out to Pure with the video to see if maybe they'll replace the unit or if they just want to rebuild the thing.

[Track/S]

As it says above, problem due to axial play, hence the boost leak.

Originally Posted by ALCOBENDAS

More info TTE please.. the big is 740+

They machined the area that I am pointing out in the pic, it should not be touched.

[heitzke]

Originally Posted by Prodrive_X

As it says above, problem due to axial play, hence the boost leak.

Yep, I think you nailed that one. Besides the audible clunk, there's... several mm of play here

[Track/S]

Originally Posted by heitzke

Yep, I think you nailed that one. Besides the audible clunk, there's... several mm of play here

Let's hope that the same thing doesn't happen again with Mosselman, good luck 💪