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RNM

Private
Jun 3, 2019
47
Where are you located?
I'm located in South Florida near Fort Lauderdale.

Apologies to NoGuru for thread jacking as it was not my intention. Next thing I'm going to do is do a leakdown test and possibly inspect the head as I want to make sure my cam ledges are OK as I was throwing 2a87 for the longest time.

NoGuru, I hope you find your leak as well.
 

[email protected]

800HP Club (N54)
Platinum Vendor
Oct 24, 2016
893
Scottsdale, AZ
I just knew that it was alot better with the gcs when tested and that it's not common for people to be aware of. Now if old boost solenoids or leaky connections would that be issue or no ?
Also If compressor over speeds could it literally start losing grip on the air and slip so essentially cavitates like a prop running to fast ? I just cant understand why the boost falls off so fast usually when it is running out of turbo it's not so drastic.


I just thought of a way to test this if target 15 psi and see if it holds that to redline that could pinpoint a turbo issue right.
Many things could cause an issue, yes a poor or leaking vacuum system will cause low boost, and boost fall off, Overspeed can cause it, etc.
 

NoGuru

Sergeant
Jan 9, 2018
375
Just North of Detroit
I'm located in South Florida near Fort Lauderdale.

Apologies to NoGuru for thread jacking as it was not my intention. Next thing I'm going to do is do a leakdown test and possibly inspect the head as I want to make sure my cam ledges are OK as I was throwing 2a87 for the longest time.

NoGuru, I hope you find your leak as well.
No, it's fine, we can troubleshoot here. I just know the topic could change as this is more of an open progression thread.

What is this "Overspeed" I hear mentioned.
 

Torgus

Captain
Nov 6, 2016
1,379
Boston
  • 2Like
Reactions: Rob09msport and NoGuru

langsbr

Lieutenant
Apr 5, 2017
996
Just curious, but why is boost tapered in the first place? Shouldn't these turbos be able to hold 25+ psi all the way to redline? Just seems odd seeing the boost target taper from 20psi down.
 

langsbr

Lieutenant
Apr 5, 2017
996
I looked at some of my old logs when I had a boost leak and it looked very similar to yours. Yours is bleeding off 3 psi or so. Mine would bleed off 5psi and it was just the o-ring on the BOV.

I would check your chargepipe T-map o-ring, your throttle body o-ring, and one silly one - if you have meth bugs in the chargepipe - make sure they are plugged. Those all seem small enough to only allow that little amount to be bled off. Do you have silicone outlets? I'd expect a crack in them to bleed more boost, but anything is possible.
 

NoGuru

Sergeant
Jan 9, 2018
375
Just North of Detroit
I looked at some of my old logs when I had a boost leak and it looked very similar to yours. Yours is bleeding off 3 psi or so. Mine would bleed off 5psi and it was just the o-ring on the BOV.

I would check your chargepipe T-map o-ring, your throttle body o-ring, and one silly one - if you have meth bugs in the chargepipe - make sure they are plugged. Those all seem small enough to only allow that little amount to be bled off. Do you have silicone outlets? I'd expect a crack in them to bleed more boost, but anything is possible.
All that stuff is going to be next on the list of things to check. I don't have meth bungs but I am leaning towards the stuff you listed.
I did start seeing some smoke when I was idling today so I am not going to drive the car except to the shop to have it looked at now.

My Exhaust is VRSF downpipes, and Vibrant resonates with the IS mufflers.
Here is a quick clip of how it sounds.
 

Rob09msport

Major
Oct 28, 2017
1,847
Monroe CT
I have same setup and love it I wouldnt mind little more flow so I am thinking of vrsf 3.5 but I was curious if you had a cat that could be clogging or something. I was thinking why not smoke test with uv fog ? This way any leak will glow with black light
 
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NoGuru

Sergeant
Jan 9, 2018
375
Just North of Detroit
I have same setup and love it I wouldnt mind little more flow so I am thinking of vrsf 3.5 but I was curious if you had a cat that could be clogging or something. I was thinking why not smoke test with uv fog ? This way any leak will glow with black light
Interesting idea using UV smoke. I might consider that once I get the smoke issue sorted out. I hope it's not a head gasket.
 

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