[mweisdorfer]

Just trying to nail down any final issues before I pull the $2000.00 trigger on a new set of turbos.

I'm not getting any codes at all related to fuel or low pressure fuel pump etc.

I only get a 30ff code that says low inlet pressure on turbos. Basically, no boost.

I just wondering if a faulty low pressure fuel sensor could be miss leading me?

It doesn't hesitate at WOT; I can run it to 7000rpm's in park and not even pop the 30ff code. I can only pop the 30ff code in drive and over 4000 rpm. The car still pulls after the code despite the 1/2 engine light.

I've checked all the connections in the intake system and the outlets too. They are all secure. I even bought new green gaskets for the FMIC. New turbo boost solenoids & new MAP sensors for the intake manifold & charge pipe.

I'm going to do a smoke test tonight, or tomorrow morning. I found a link to an attachment for $30.00 that would allow one to do a pressure test. I might buy it, and make the pressure test my last straw.

http://www.siliconeintakes.com/intak...ter-p-167.html

You can buy it on Amazon too.

So, do you think a fueling issue could be an issue? I'm 95% sure it's not. That's because I don't have any code that says so.

Please Advise..

[Bimmer_Engineer]

Do you have a log you could share?

[NoGuru]

I have this kit coming in the mail today https://turboboostleaktesters.com/bm...0l-twin-turbo/

You can borrow it if you would like.

[mweisdorfer]

Originally Posted by Bimmer_Engineer

Do you have a log you could share?

I do, but my phone in an Apple. So, I have to use my tablet to post.

I did turn the wastegate all the way up to 80%. It seemed to help. This just convinced me even more it's turbos 😓

[mweisdorfer]

Originally Posted by NoGuru

I have this kit coming in the mail today https://turboboostleaktesters.com/bm...0l-twin-turbo/

You can borrow it if you would like.

Wow, very cool. I might just buy that.

[mweisdorfer]

Originally Posted by Bimmer_Engineer

Do you have a log you could share?

I believe my OEM turbos on my N54 motor are toast. They have 163,000 miles on them.

The N54 has two turbos, if you recall.

I put MHD tune on it, and I'm only getting 8psi boost on a good day. Most times I'm getting less then 6psi. I'm supposed to get 15-17psi.

The car has the following bolt on's

1) 1.75" silicone inlets
2) 2" silicone outlets
3) 3" catless downpipes
4) 2ndary cat delete - HF Resonators in their place
5) AFE Momentum CAI box
6) 1 step NKG colder plugs
7) Eldor coils
8) 5" stepped FMIC
9) Rob Beck upgraded PCV valve
10) Mishimoto catch can
11) Upgraded silicone, platinum cured vac lines

I did a walnut blast in April.

I've done the following:

New boost sensors
New MAP sensors
Tightened down the wastegates both manually & with software.
New Gaskets in FMIC connections

Checked all connections along intake track.

The software wastegate fix seemed to help a little.

The car can be run to 7000rom and not blow one code. You don't hear any excessive air leak etc.

Drive it and you get a different story.

You get 1/2 engine light and 30ff code above 4000 rpm when going WOT. The car still pulls though and power isn't really cut. Weird.

You can also hear a lot of air movement like a whooshing sound in the cabin where the turbos would be on the other side of the firewall.

I have several diagnostic tools and software. INPA, ISTA D & P, Carly etc.

I'm not an expert with this software, but am reasonably familiar with them and can figure out stuff by researching forums on how to better use it.

The only code I get is the 30ff code - low air pressure at turbo intake.

I'm going to do a smoke test today/ tomorrow to see what that might reveal.

[Chris@VargasTurboTech]

Boost leak check time!

[mweisdorfer]

Originally Posted by Chris@VargasTurboTech

Boost leak check time!

Yep, starting to think it's failing wastegates

[Sgop335]

Originally Posted by NoGuru

I have this kit coming in the mail today https://turboboostleaktesters.com/bm...0l-twin-turbo/

You can borrow it if you would like.

The owner Dave has great customer service!

[type-dRew]

Originally Posted by mweisdorfer

I do, but my phone in an Apple. So, I have to use my tablet to post.

I did turn the wastegate all the way up to 80%. It seemed to help. This just convinced me even more it's turbos 😓

Datazap doesnt care what phone you have just link the log

[mweisdorfer]

Did a smoke test on the engine. I bought a stinger brand smoke leak tester on Amazon.

It has 91% of the reviews being 5 stars.

Well, it didn't disappoint. It makes a lot of smoke in a very short amount of time.

I found a leak in the system. The silicone outlet on the front turbo had popped off!!!

Nothing on the inlet side had even a remote leak.

I remounted the outlet and bingo! I had instant boost.

I have since ordered a VRSF aluminum 2" outlet. I did this because I don't want to have this problem again. This product mounts with a V clamp, so, no way it's popping off.

So, still on stock turbos for now !

I will be upgrading to RB stage 1 turbos when the stock ones finally go, but for now there's no sense dropping $1700 if I don't have too.

I did buy a quick jack, and it was delivered Friday. Set up was easy pleasey. All I can say is WOW!

You have soooo much room under there now. There's no question you could drop the Tranny and do a rear main seal DIY. My car is lowered, and it still fits under the car.

[NoGuru]

Glad you got it fixed without spending money on new Turbos. I might have to get the smoke tester just to have it.

[mweisdorfer]

Originally Posted by NoGuru

Glad you got it fixed without spending money on new Turbos. I might have to get the smoke tester just to have it.

This is the one I got

STINGER Brand EVAP Smoke Machine Leak Tester with EVAP Adapter & TWO Smoke Tips. Tests EVAP, Intake, Exhaust, Vacuum Lines, Manifolds, etc - Stinger Brand is The BEST CHOICE in Smoke Testing!!! https://www.amazon.com/dp/B0758ZRBT7..._hp4bDb5DZX93N

[nissubaru]

Originally Posted by mweisdorfer

Did a smoke test on the engine. I bought a stinger brand smoke leak tester on Amazon.

It has 91% of the reviews being 5 stars.

Well, it didn't disappoint. It makes a lot of smoke in a very short amount of time.

I found a leak in the system. The silicone outlet on the front turbo had popped off!!!

Nothing on the inlet side had even a remote leak.

I remounted the outlet and bingo! I had instant boost.

I have since ordered a VRSF aluminum 2" outlet. I did this because I don't want to have this problem again. This product mounts with a V clamp, so, no way it's popping off.

So, still on stock turbos for now !

I will be upgrading to RB stage 1 turbos when the stock ones finally go, but for now there's no sense dropping $1700 if I don't have too.

I did buy a quick jack, and it was delivered Friday. Set up was easy pleasey. All I can say is WOW!

You have soooo much room under there now. There's no question you could drop the Tranny and do a rear main seal DIY. My car is lowered, and it still fits under the car.

Silicone outlet? Do you have aftermarket outlets installed? I assume you mean outlet though considering a loose inlet would not have that effect on boost.

[mweisdorfer]

Originally Posted by nissubaru

Silicone outlet? Do you have aftermarket outlets installed? I assume you mean outlet though considering a loose inlet would not have that effect on boost.

Yes, I have MMP silicone outlets. The outlet popped off the connection point to the front turbo. I wasn't really looking at this area, which was my mistake. I guess when the code said low pressure at turbo "inlet" I focused on the inlet side. My bad.

At any rate, I have a VRSF 2" aluminum outlet coming. It will be here Thursday. I'll probably install it Friday.

I didn't like how the outlet installed on the front turbo when I put it back on. At some point, I think it will just pop back off.

I'm on stage 1+ and I'm making 17.8psi of boost at around 4000 rpm and about 440# or torque.

I haven't opened her at WOT, for fear of the outlet popping off again..

[nissubaru]

Originally Posted by mweisdorfer

Yes, I have MMP silicone outlets. The outlet popped off the connection point to the front turbo. I wasn't really looking at this area, which was my mistake. I guess when the code said low pressure at turbo "inlet" I focused on the inlet side. My bad.

At any rate, I have a VRSF 2" aluminum outlet coming. It will be here Thursday. I'll probably install it Friday.

I didn't like how the outlet installed on the front turbo when I put it back on. At some point, I think it will just pop back off.

I'm on stage 1+ and I'm making 17.8psi of boost at around 4000 rpm and about 440# or torque.

I haven't opened her at WOT, for fear of the outlet popping off again..

Yeah idk how I feel about outlets. I have relocated inlets and the rear one can be a bitch, I can only imagine the same for silicone outlets.

Good to know your turbos are still holding up after so many miles though.

[mweisdorfer]

Originally Posted by nissubaru

Yeah idk how I feel about outlets. I have relocated inlets and the rear one can be a bitch, I can only imagine the same for silicone outlets.

Good to know your turbos are still holding up after so many miles though.

Yep, turbos are in good shape or seemingly anyways. No wastegate rattle, after I fixed both turbos about 40,000 + miles ago. Car pulls hard and really throws you back in your seat. I have stage 1 xHp trans tune on it, which is supposed to be an updated/ upgraded version of the Alpina trans tune. I bought stage 2, but haven't flashed it yet. I'm enjoying the mpg increase with stage 1...

[Sgop335]

Originally Posted by mweisdorfer

Yes, I have MMP silicone outlets. The outlet popped off the connection point to the front turbo. I wasn't really looking at this area, which was my mistake. I guess when the code said low pressure at turbo "inlet" I focused on the inlet side. My bad.

At any rate, I have a VRSF 2" aluminum outlet coming. It will be here Thursday. I'll probably install it Friday.

I didn't like how the outlet installed on the front turbo when I put it back on. At some point, I think it will just pop back off.

I'm on stage 1+ and I'm making 17.8psi of boost at around 4000 rpm and about 440# or torque.

I haven't opened her at WOT, for fear of the outlet popping off again..

If you are looking at the datalog and saying torque 440, that is not engine torque. That is a load to torque table.