[widetyres]

I fitted an MST inlet the other weekend and took a picture of the turbo whilst the inlet was off.

The turbo looks to have seen some dust particles from the wear on it - I have been running a pipercross drop in filter (which is an oiled foam filter) for about 2 years. However, is this level of wear ok/normal, or should I be sticking the oem filter back in?

Thanks.

[ZM2]

Ouch. This is why I don’t even run the aFe dry drop in filter. Stock paper filter only for me. Both my stock and Dinan turbos looked pristine when they came off my car.

I’ll let others comment on the impact of the impeller wear.

[///MPhatic]

That doesn't look normal at all.

[widetyres]

Originally Posted by ///MPhatic

That doesn't look normal at all.

Originally Posted by ZM2

Ouch. This is why I don’t even run the aFe dry drop in filter. Stock paper filter only for me. Both my stock and Dinan turbos looked pristine when they came off my car.

I’ll let others comment on the impact of the impeller wear.

That's the end of aftermarket filters for me then!

The engine is still making really good power, so I don't think that the wear is enough yet to affect the performance, but run like this for a few more years and the blades could start to change shape I guess. Don't want that to happen so the oem filter wok be back in tomorrow.

[F87source]

Originally Posted by widetyres

I fitted an MST inlet the other weekend and took a picture of the turbo whilst the inlet was off.

The turbo looks to have seen some dust particles from the wear on it - I have been running a pipercross drop in filter (which is an oiled foam filter) for about 2 years. However, is this level of wear ok/normal, or should I be sticking the oem filter back in?

Thanks.

Yeah that looks really bad, it really shouldn't be damaged at all regardless of mileage because the filter should stop all of the dust from getting in. I would swap back to the stock paper filter (no charcoal layer unless you live in the desert or a really dusty environment. But yeah this is why I don't like high flow filters.

Originally Posted by ZM2

Ouch. This is why I don’t even run the aFe dry drop in filter. Stock paper filter only for me. Both my stock and Dinan turbos looked pristine when they came off my car.

I’ll let others comment on the impact of the impeller wear.

+1

Originally Posted by ///MPhatic

That doesn't look normal at all.

+1

Originally Posted by widetyres

That's the end of aftermarket filters for me then!

The engine is still making really good power, so I don't think that the wear is enough yet to affect the performance, but run like this for a few more years and the blades could start to change shape I guess. Don't want that to happen so the oem filter wok be back in tomorrow.

One of the blades looks like it is fraying - like a bit of metal is peeling off. You should take a look at that.

[///393]

My intake tract is stock for this reason exactly. The juice ain’t worth the squeeze.

[AmuroRay]

This is pretty extreme assumptions being made. People have run intakes on these cars and PWGs for over 10 years, and how many people have seen their turbo go? I would say it’s an issue that could have been there before the intake, and if it’s from the intake - no one stateside uses a foam filter.

[F87source]

Originally Posted by AmuroRay

This is pretty extreme assumptions being made. People have run intakes on these cars and PWGs for over 10 years, and how many people have seen their turbo go? I would say it’s an issue that could have been there before the intake, and if it’s from the intake - no one stateside uses a foam filter.

The damage patterns on the leading edge are indicative of impact strikes, they're exactly the same pattern as what you'd see from pre turbo water injection where the water droplets striking the compressor causes damage. That combined with the knowledge from UOA's showing drop in filters (foam or not, because there are oil analysis showing simple high flow drop in panel filters letting alot more dust in as well, and this is likely because these high flow filters in order to get more flow with the same surface area as stock have to increase filter pore size), allowing more dust particles in is quite evident it is dust causing the damage. So in OP's case it's likely the foam filter was just not as good enough and the particle size let through was just too big. For cotton high flow filters that have been used for a long time, the particle sizes let through aren't big enough to cause issues but they still let dust in as shown by UOA's, which is never good for the engine.






Pre turbo water injection damage:

[AmuroRay]

Sounds like he over oiled and/or installed a wet filter on his car. That, and foam filters have always been garbage in my opinion, but the guys overseas do things I find irrational, like dyno with the hood down

https://f30.bimmerpost.com/forums/sh....php?t=1830358

Oil thread here doesn’t indicate any high amounts of insolubles in the oil of anyone with an intake, and they are actually lower than the universal average. I would assume this is a one off, since many people have installed inlets, and this isn’t a common image.

The sound and throttle response, not even the power increase (which is there) was enough for me to take my intake over the stock box/paper. But to each their own.

[AmuroRay]

https://www.e90post.com/forums/showthread.php?t=1779483

https://www.triumph675.net/threads/a...-filter.40100/

Pipercross is garbage, throw it out and go with an AFE dryflow. No need to go back to the paper filter.

[ZM2]

The rub here is no one has shown significant (or any) gains with aftermarket intakes or filters vs the stock M2 intake, just more noise if you’re into that kind of thing.

And silicon increased in my oil analysis when I ran the aFe dry filter.

So if there’s no major added power, and there’s potential for contamination, why run it? Simply for the vanity of added sound or showing off under hood looks?

That’s quite a trade off.

[AmuroRay]

Originally Posted by ZM2

The rub here is no one has shown significant (or any) gains with aftermarket intakes or filters vs the stock M2 intake, just more noise if you’re into that kind of thing.

And silicon increased in my oil analysis when I ran the aFe dry filter.

So if there’s no major added power, and there’s potential for contamination, why run it? Simply for the vanity of added sound or showing off under hood looks?

That’s quite a trade off.

Most people don’t notice an increase in silicon (again, thread linked with oil analysis from different cars and drivers) and there is a tangible gain I noticed in throttle response and power.

Again, 10-20wtq is not worth it to some, but for me it makes driving more enjoyable. To each their own.

[///393]

I find it interesting you’re so data driven in your analysis of intercoolers, yet claim 10-20wtq from an inlet and intake without data to support it.

I haven’t seen this verified on dynos with the hood up, or down

[ZM2]

Originally Posted by AmuroRay

Most people don’t notice an increase in silicone (again, thread linked with oil analysis from different cars and drivers) and there is a tangible gain I noticed in throttle response and power.

Again, 10-20wtq is not worth it to some, but for me it makes driving more enjoyable. To each their own.

My point is a dry drop in or diff intake may make sense to some with non-M2 N55 cars to get a little bump, but there’s no gain in doing so on the M2 bc the intake is not a restriction.

So, it’s all risk, no reward.

[ZM2]

Originally Posted by wilson kop

I find it interesting you’re so data driven in your analysis of intercoolers, yet claim 10-20wtq from an inlet and intake without data to support it.

There are pretty easy intake swap whp gains on f2x/f3x N55 cars, but not the M2 N55. That said, there’s no reason to argue about those cars/situations over here on the F87 forum. The F30 forum has some good threads.

The M2 intake is good to go from the factory, unless you’re pushing Stage 3 like power & boost. Plus, it gives better under hood hot air, water, and dirt protection than all the aftermarket options.

[F87source]

Originally Posted by AmuroRay

Most people don’t notice an increase in silicone (again, thread linked with oil analysis from different cars and drivers) and there is a tangible gain I noticed in throttle response and power.

Again, 10-20wtq is not worth it to some, but for me it makes driving more enjoyable. To each their own.

Most people don't take base lines under the same condition (tune etc) with the stock setup. Most people do a one and done test.

[AmuroRay]

Originally Posted by wilson kop

I find it interesting you’re so data driven in your analysis of intercoolers, yet claim 10-20wtq from an inlet and intake without data to support it.

I haven’t seen this verified on dynos with the hood up, or down

If you know I’m data driven, know I’m not going to say something without some sort of evidence:

https://f87.bimmerpost.com/forums/sh...9#post27948519

https://f87.bimmerpost.com/forums/sh...1318580&page=3

BMS:

Independent test by Bimmerworld (on their product webpage) M2 vs Injen intake


Independent test by forum member


New evidence:

https://f30.bimmerpost.com/forums/sh...1710794&page=3

AmuroRay So i tossed my 3 logs into VD from after I installed the race IC. I believe the relevant things i have changed since the baseline log im comparing to (Red) would be TIC, MSTv2 inlet, MPPK airbox mod, and race IC. No change in tune or fueling used. These logs didnt really have perfect timing, but are still comparable. Part of me wants to say that the fairly consistent higher power between like 3200-3800 is from the inlet and airbox mods, but its all kindof within the noise.

(looks like 20wtq to me)



Intakes are absolutely more effective with a inlet installed, which itself was good for 10whp per BeePee and 3t3p’s independent dynos.

In terms of more dirt/silicon found in the samples - I haven’t seen any significant variations in terms of dry vs paper, but feel free to post examples.

[AmuroRay]

The inlet dyno graphs:


Pre vs Post mst inlet, turbo smart Diverter, and intercooler 412hp to 421hp - 9hp



https://f30.bimmerpost.com/forums/sh...1&postcount=20
395hp to 405hp - 10hp (pure inlet)

[ZM2]

Looks like we're confirming what I said: limited gains for intakes on the M2, a decent bit more gains on other N55's.

[///M TOWN]

Originally Posted by AmuroRay

https://www.e90post.com/forums/showthread.php?t=1779483

https://www.triumph675.net/threads/a...-filter.40100/

Pipercross is garbage, throw it out and go with an AFE dryflow. No need to go back to the paper filter.

I run the AFE dry and I have inspected my turbo prior to installing my turbo inlet and it was like new visually

I learned about foam filters being insufficient when I was running a HKS bell style foam filter on my Honda engine and found sand like debris inside the path to the throttle body after a friend told me to look for it… He was right!

I immediately removed and sold the HKS and I returned to a stock airbox and a dry filter

[///M TOWN]

Originally Posted by ZM2

Looks like we're confirming what I said: limited gains for intakes on the M2, a decent bit more gains on other N55's.

M2 has a simple but great intake design

The T~inlet is clearly the bottleneck

[KevinC]

Mann, Mahle, or Hengst. Period/exclamation point.