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Old 10-06-2021, 01:43 AM   #1
Savage388
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Default Vacuum leak at turbo inlet

My Cobb inlet somehow slipped off the turbo ( had a shop do it while they did my air pump delete) and cannot get it reseated properly. I'm having large af learns at idle +15-17. Is it better to unplug the MAF and run closed loop while it leaks or just limp it along as is until I can/have someone help get me get the inlet back on properly? It's my daily so I can't really have it down for a couple days.
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Old 10-06-2021, 02:26 AM   #2
K3rm1tth3fr0g
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Use Lyfts until you can actually fix the car.

Seriously it'll be cheaper to use rideshare now or rent a car and avoid blowing up your engine from a ****load of unmetered air getting in your turbo and causing you to run lean.

Last edited by K3rm1tth3fr0g; 10-06-2021 at 08:54 AM.
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Old 10-06-2021, 03:35 AM   #3
Savage388
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Yea I was hoping that wouldn't be th consensus, I'm going to have to find an extra set of hand to take the manifold off asap then, I cannot move it with it on. For what it's worth the wideband shows stoic at all times so I'm still in the ecu's range of adjustment while out of boost, I drove it around the block a couple times while it learned.
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Old 10-06-2021, 06:19 AM   #4
KillerBMotorsport
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I'm with Kermit on this one. If you were driving it down the street to a shop for repair, it would be OK, but normal driving I would not recommend.

What the AP shows and reality are not always in sync. The numbers can change faster than your eyes can see them/what a datalog shows/ what is reality based on ECU cycle rate. Unmetered air INTO a turbo engine is not recommended. If you had a boost leak, that would be far less dangerous, but yo have the opposite issue here.

Unfortunately, you have a tough choice here. Pay for a ride vs pay for potentially a failed engine (and then be out of a ride) vs trying your luck at a lottery ticket. If it were me, I'd find another mode of transport until the issue can be resolved.
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Old 10-06-2021, 08:24 AM   #5
Jefe159
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Assuming you are 25 or over renting a car for a week is likely cheaper and more convenient than ride share. Even cheaper yet is a case of redbull and a long night in the garage
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Old 10-06-2021, 10:33 AM   #6
djoye
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I'm curious, is that an original Cobb inlet (requires trimming) or their v2 inlet?

Also, if possible, remove the alternator and unbolt the power steering pump (leave hoses connected, but unplug any electrical connections) and set it aside. That might give you enough room without loosening the intake manifold. The Cobb inlet is too bulky and this is the same issue I had with my original Cobb inlet but I caught it before it got this bad. I'm currently using a Killer B inlet that hasn't had any issues staying on the turbo and I previously used a Perrin inlet that fit perfectly and installed easily. Sell that Cobb inlet to someone if it wasn't trimmed too short (if applicable to your model) and buy something that fits.

Last edited by djoye; 10-06-2021 at 10:49 AM.
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Old 10-06-2021, 01:59 PM   #7
Savage388
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Thanks all. I've arranged ways to get back and forth to work until I can get this sorted. Im just baffled I can't get the damn thing back onto the turbo. Not looking forward to round 3 if me vs a turbo inlet.
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Old 10-06-2021, 04:43 PM   #8
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Quote:
Originally Posted by Savage388 View Post
Thanks all. I've arranged ways to get back and forth to work until I can get this sorted. Im just baffled I can't get the damn thing back onto the turbo. Not looking forward to round 3 if me vs a turbo inlet.
I can guarantee it's not going to budge until you remove something else. Because of its size, it's basically smashed/wedged between the intake manifold and power steering pump. It's amazing how it can seem so stationary yet will creep off the turbo. If you manage to get it back onto the turbo and positioned correctly towards the intake pipe, tighten the inlet clamp on the turbo before tightening anything else (manifold, pump, etc.) as a measure to make it stay in place, but keep an eye on it.

Mine was the early model that required trimming, initial install was done without trimming and it eventually crept away from the turbo, I later attempted to trim to improve the fit, I might've trimmed a little too much and just couldn't get it right. It would seem like it was secured to the turbo, but would immediately pull off when tightening down the intake manifold.
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Old 10-07-2021, 12:40 AM   #9
Savage388
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Quote:
Originally Posted by djoye View Post
I can guarantee it's not going to budge until you remove something else. Because of its size, it's basically smashed/wedged between the intake manifold and power steering pump. It's amazing how it can seem so stationary yet will creep off the turbo. If you manage to get it back onto the turbo and positioned correctly towards the intake pipe, tighten the inlet clamp on the turbo before tightening anything else (manifold, pump, etc.) as a measure to make it stay in place, but keep an eye on it.



Mine was the early model that required trimming, initial install was done without trimming and it eventually crept away from the turbo, I later attempted to trim to improve the fit, I might've trimmed a little too much and just couldn't get it right. It would seem like it was secured to the turbo, but would immediately pull off when tightening down the intake manifold.
I specifically bought a V2 because of these issues and to get my tuner off my back with the leak from the OEM one. I removed the easy to get to stuff yesterday trying to get it reseated but no luck, can't make another attempt until Saturday when I'm off. Really thinking about going speed density so if this happens again I can still drive the car.
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Old 10-07-2021, 11:16 AM   #10
djoye
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Quote:
Originally Posted by Savage388 View Post
I specifically bought a V2 because of these issues and to get my tuner off my back with the leak from the OEM one. I removed the easy to get to stuff yesterday trying to get it reseated but no luck, can't make another attempt until Saturday when I'm off. Really thinking about going speed density so if this happens again I can still drive the car.
Their v2 inlet looks fine judging by pictures, at least the turbo end of it. If the turbo or the inlet was previously lubricated to make installation easier, I'd use brake cleaner to cleanup the metal surface of the turbo's inlet, then use something less harsh (Goo Gone then soap + water?) to cleanup the inside of the Cobb inlet. It might be a struggle to get the inlet to slide on without lube, but should be worth it. Also, if you no longer have the bracket that holds the up-pipe to the engine block (hopefully people know better than to leave that off), get one so the turbo doesn't have any reason to try to pull away from the inlet.

Because the fat end of the inlet inevitably binds when you start tightening things towards the intake, it might be worth it to spray silicone lubricant on a cloth and then liberally wipe it on the inlet tube where it might contact the manifold or PS pump so that it will slip instead of stick and start pulling away from the turbo when it contacts other parts during tightening.
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Old 10-08-2021, 04:58 AM   #11
Savage388
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Quote:
Originally Posted by djoye View Post
Their v2 inlet looks fine judging by pictures, at least the turbo end of it. If the turbo or the inlet was previously lubricated to make installation easier, I'd use brake cleaner to cleanup the metal surface of the turbo's inlet, then use something less harsh (Goo Gone then soap + water?) to cleanup the inside of the Cobb inlet. It might be a struggle to get the inlet to slide on without lube, but should be worth it. Also, if you no longer have the bracket that holds the up-pipe to the engine block (hopefully people know better than to leave that off), get one so the turbo doesn't have any reason to try to pull away from the inlet.

Because the fat end of the inlet inevitably binds when you start tightening things towards the intake, it might be worth it to spray silicone lubricant on a cloth and then liberally wipe it on the inlet tube where it might contact the manifold or PS pump so that it will slip instead of stick and start pulling away from the turbo when it contacts other parts during tightening.
I still have the uppipe bracket in there and after some work with a buddy we got it in without too much drama and no manifold removal. Not sure if it wasn't fully seated or something shifted but it's on there and I'll be keeping an eye on it.
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