[Bmw doubles]

Originally Posted by Stück

Its not the wastegate, it was sticky back when but has proved to be a non-issue since. Just won't make more than ~15psi and drops to 11 after 5300 or so.

I've done all the trouble shooting I can without pulling the turbo.

Originally Posted by Stück

Its not the wastegate, it was sticky back when but has proved to be a non-issue since. Just won't make more than ~15psi and drops to 11 after 5300 or so.

I've done all the trouble shooting I can without pulling the turbo.

On stock PWG Alex has mine hit 19psi and tapper to 13. Something is up with the solenoid or wastegate arm. You should be able to 20 something and hold

[Stück]

I've exhausted all means by which to find an outside factor on the car causing these issues. Pure is building a replacement unit to send out and swap. I've spent dozens of hours troubleshooting and swapping parts, exchanged dozens of emails with Pure, and brainstormed more than I can recall with Alex MissionPerformance

Pure still doesn't think its the turbo, but is going to start building a replacement to send out. I really don't want it to be but I don't know what else it could be... especially since coming across a post by drdingo detailing his all too similar experiences. punctuated by the turbo actually failing. A replacement got him sorted and boostin like he should be.

http://f10.5post.com/forums/showpost...1&postcount=33



Some of the items I've worked through:

1. Diverter operation
The vehicle and all the original components on it have about 25k on them. I installed a new GFB DV+ on the original diverter valve at time of turbo install. I initially swapped the diverter back to stock configuration, and then subsequently replaced it this past weekend as an assembly with a new OEM Pierburg Diverter valve. No change in behavior.

2. Vacuum tested.
I've setup dual vacuum gauges on the vehicle while driving. One T'd into the vacuum pump output, and the other T'd into the EDPW control output. The vacuum pump quickly pegs the gauge at -30 inHg, and the control side stays well in excess of the 7-8 inHg required to hold it fully closed.The entire system holds vacuum with zero leak down overnight. My car was not optioned with the exhaust flapper and the second vacuum fitting on the valve cover has a plug cap on it from the factory. I have removed it to ensure it wasn't split, but again... it holds vacuum over night.

3. Boost leak tested.
I have tested with smoke and shop air no less than 3 separate occasions, and I have had one of the shop techs test it as well. I even built a fitting that screws a schrader valve into the meth port on my chargepipe so I can attach regulated shop air without leaky pipe caps and such nonsense. I get normal leak past the valve seats above 10-12psi or so, approximately 1psi per 30sec but otherwise it holds steady at 15-20psi, or whatever I have it regulated at. I even took the whole setup home to my garage where its whisper quiet, closed the door, and tested with zero ambient noise. If there was a whisp of smoke or the smallest of leaks I would have seen and heard it.

4. Verified off-car wastegate actuator.
I have removed the wastegate actuator from the vehicle and articulated it dozens of times by hand. Even with a side load on it it will move through its range of motion unhindered. With a vacuum applied to it I can push, pull and sideload the rod with no escaped vacuum. With hand pump vacuum applied on and off the car it reaches fully closed within 7-8 inHg, factory specs.

5. Vacuum solenoid/pressure conveter/EDPW
I swapped the vacuum solenoid from my wife's F25 X3 over and no behavior change. I then bypassed it entirely and ran vacuum pump output straight to the wastegate actuator. It slams shut immediately upon starting the engine and is not seen to move when revving the engine in neutral. I pushed on it with a long pry bar trying to open at idle and it was closed forcefully and presented tremendous resistance to my effort. I went one step further and wired the wastegate arm shut with an uncoated coat hanger and even then did not see any change of behavior. The DME is asking for 100% WGDC, its getting it. With the wastegate physically wired shut it will not make more than 19psi by 4k rpm, and start dropping to 14 by 5k, and 11 by redline. It should pretty much insta-overboost 20 25psi+ wired closed. It does not, it can not. I would need to have the boost leak to end all boost leaks to lose that much boost pressure and volume at higher RPM and would be an extremely audible leak.

7. Verify closing vacuum for the wastegate with hand pump?
I have applied a mightyvac hand pump directly to the wastegate actuator and verified it moves through its range of motion correctly. It is reaching fully closed by 7-8Hg, precisely the same as my stock F25 X3. At one point this movement was restricted by the wastegate flapper arm binding, but that seems to have been resolved with repeated applications of lubricant and it now opens and closes without resistance every time I've dropped the undertray and reached up to articulate it.


The car has a catless ER downpipe with flex section, I have dropped the exhaust to inspect and verified no collapse/failure of the flex section.

I'm seeing what looks like decay of output/boost output vs what I've logged over time, as of current I'm seeing a maximum of 16psi by 5100RPM, tapering quickly to 9.5-10psi at 6840rpm.... With the wastegate mechanically disabled in the closed position.

Working normally with everything in factory control figuration I expect the turbo to be fully spooled and outputting a minimum of 17psi by 1800RPM, 20psi (or wherever the control limit has been set by 3000RPM holding that control limit through redline. As it stands my turbo struggles to make 16psi by 5000rpm, and then drops like a rock to 10psi or less by 6800rpm. I made more power on the factory original turbo.

[lsturbointeg]

^^^^^

sorry to hear about that! hopefully you'll figure something out! one the reasons why i shy'd away from going with upgraded turbos is i don't have any local shops who specialize in tuning these out here in Ohio. at least you have the knowledge to at least trouble shoot the issue but in this case you're coming up empty.

[Bmw doubles]

@stück that is horrible sorry so much time has gone into that with no results. All I can say is I know it's possible to hold more boost and that the stock turbo is definitely the limiting factor. I'm holding 13 to redline.

Alex is going to rebuild my stock turbo within the month. Let's see if what happens and maybe that will shed some light.

[AMT92]

Originally Posted by Bmw doubles

@stück that is horrible sorry so much time has gone into that with no results. All I can say is I know it's possible to hold more boost and that the stock turbo is definitely the limiting factor. I'm holding 13 to redline.

Alex is going to rebuild my stock turbo within the month. Let's see if what happens and maybe that will shed some light.

Why rebuild and not just go with Pure stage 1?

[lsturbointeg]

Originally Posted by AMTF10

Why rebuild and not just go with Pure stage 1?

that PureTurbo is pretty much your stock turbo housing with different internals.

[Bmw doubles]

@stück have you read this about PS1? The guy used a JB4 and now boost holds?! Crazy.


Pure Turbos Stage 1 - UPDATED JULY 25 http://f30.bimmerpost.com/forums/sho....php?t=1257819

[Stück]

Originally Posted by Bmw doubles

@stück have you read this about PS1? The guy used a JB4 and now boost holds?! Crazy.


Pure Turbos Stage 1 - UPDATED JULY 25 http://f30.bimmerpost.com/forums/sho....php?t=1257819

I wish it was as simple as that. Its not a software issue, and there is nothing a JB4 can do to help if literally wiring the wastegate in the completely closed position still does not get the turbo to build/hold boost.

With the EDPW bypassed, or the wastegate wired closed it pretty much removes the tune and DME control from the equation. With the wastegate cinched closed the turbo should be able to instantly spool and overboost to 25+psi by 2500-3000rpm for sure.

My turbo with the wastegate cinched closed barely manages to make 16psi by 4500-5000rpm.

The DME could still close the throttle to prevent overboost, but the TMAP would show a large pressure differential between the charge pipe and the intake manifold. It doesn't.

The DME could open the diverter valve to attempt to slow the shaft speed, but you'd hear it, and even if it did the bypass valve doesn't have sufficient flow to vent off that volume of air at higher RPM's.

[Bmw doubles]

After all that time testing every possibility, have you tried to pressure test the the turbo directly and see how much PSI the turbo itself can take? Maybe the wheel is defective and PURE needs to replace the one they sold you?

[Dollar Bill 535]

Stück, what is the update on your turbo?

Alot of people are waiting on an update including myself.

[Stück]

Haven't heard anything for a few weeks, shot off an email Friday before I left work... waiting just like you I'm afraid.

[AZ-MCRacer]

Originally Posted by Stück

Haven't heard anything for a few weeks, shot off an email Friday before I left work... waiting just like you I'm afraid.

Did you pull and send the turbo back to Pure?

[Dollar Bill 535]

Originally Posted by Stück

Haven't heard anything for a few weeks, shot off an email Friday before I left work... waiting just like you I'm afraid.

Have you been daily driving it still with no issues other than the turbo?

Are you waiting to hear back from Pure?

[Stück]

I can't pull the turbo because its a daily driver, Pure is building a replacement and I'll ship back this unit.

Car still drives fine. just isn't making the boost/power it should.

[Stück]

I've got word from Pure that the turbo should ship end of the week, along with the inlet flanges so I can fabricate my own inlet. Pure does not sell one for the F10 chassis but they will sell you the machined flanges for applications they don't support.

Hoping to have some much much desired updates and an actual dyno soon.

[AZ-MCRacer]

Glad to hear it! I am curious what you find on the inlet, I definitely think the stock one is a restriction on our cars.

[Stück]

So a small update.

The turbo never shipped, and Pure has decided that fabrication of a larger turbo inlet is requisite before going down the road of replacement.

Pure sent me an inlet flange so I could fabricate said inlet. To be clear Pure does not offer an F10 N55 inlet, only for other chassis.

The flange came yesterday and I knocked out the fabrication today. Tomorrow I'll have it TIG welded together and then I'll install it back in the car.






The stock inlet necks down to 45mm ID at the turbo, where as the new inlet is a minimum of 57mm ID. That is a 60% cross sectional area increase between them... heres hoping it unleashes the beast.

[Bmw doubles]

Originally Posted by Stück

So a small update.

The turbo never shipped, and Pure has decided that fabrication of a larger turbo inlet is requisite before going down the road of replacement.

Pure sent me an inlet flange so I could fabricate said inlet. To be clear Pure does not offer an F10 N55 inlet, only for other chassis.

The flange came yesterday and I knocked out the fabrication today. Tomorrow I'll have it TIG welded together and then I'll install it back in the car.






The stock inlet necks down to 45mm ID at the turbo, where as the new inlet is a minimum of 57mm ID. That is a 60% cross sectional area increase between them... heres hoping it unleashes the beast.

Oh shit nice! Could you make more of these? This is a must have for me too? I'm in the process right now of a turbo upgrade.

[Stück]

Yeah, you're not the first to ask. I will make a few more provided my initial prototype increases the chooch factor.

[Bmw doubles]

Originally Posted by Stück

Yeah, you're not the first to ask. I will make a few more provided my initial prototype increases the chooch factor.

Please keep me in the loop on this one

[Dollar Bill 535]

Stück, you stated on July 25th that Pure already agreed to ship out a replacement turbo, but now surprise surprise it might not need a replacement. You are an absolute fraud, you've never posted one single solid piece of proof that you have a Pure Stage 2 or many of the other F10 modifications that you claim to have installed. I think that you post pics of installed for other vehicles (because you work in a tuning shop) and then you pass them off like it's getting installed on your own car. You've wasted so much time and should honestly be ashamed for being such a phony. I hope you can prove me wrong... Post a video tour of your F-10, post some proof pics like you did of your garage remodel, post a log, post an email or invoice from Pure, post anything at all. You're active on this forum and others almost everyday, yet you always seem to be too busy or have some excuse to prevent you from posting something that actually proves even some of your claimed mods.

[Dollar Bill 535]

I sincerely hope you prove me wrong...