GMPP Stage 1 - Turbo more audible?
03-05-2013, 09:15 AM
#1
Member
Thread Starter
Join Date: 12-12-2011
Location: Chicago
Posts: 20
GMPP Stage 1 - Turbo more audible?
Hey all,
Just curious, does the GMPP S1 upgrade affect the sound of the turbo at all? in other words, does it spool up faster and thereby become more audible?
My only complaint with my new (to me) HHR SS is that the turbo is almost totally silent!
I tried taking the intake cover off, and it's definitely better, but I've noticed that it idles a bit rougher upon start up, so I'm planning to make an aluminum cover with a removable plexiglass center.
Anyhow - curious what else if anything you guys are doing that maintains the warranty to make these things a bit noisier? (gotta love the turbo sounds!)
Thanks
Evo
Just curious, does the GMPP S1 upgrade affect the sound of the turbo at all? in other words, does it spool up faster and thereby become more audible?
My only complaint with my new (to me) HHR SS is that the turbo is almost totally silent!
I tried taking the intake cover off, and it's definitely better, but I've noticed that it idles a bit rougher upon start up, so I'm planning to make an aluminum cover with a removable plexiglass center.
Anyhow - curious what else if anything you guys are doing that maintains the warranty to make these things a bit noisier? (gotta love the turbo sounds!)
Thanks
Evo
03-05-2013, 12:38 PM
#3
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
For me I did noticed the turbo did get louder after I had the GMTU installed but im assuming its because its boosting over 20 PSI more boost=louder turbo? Before the upgrade yeah the turbo was pretty quiet but then again I was mostly boosting between 5 and 10psi before the upgrade rarely would I even see 15PSI.
03-05-2013, 12:49 PM
#4
Senior Member
Join Date: 02-19-2010
Location: Buffalo ny
Posts: 1,529
I don't know if louder is correct. It may be a bit louder at 25 psi, but I have a different theory....Maybe it just seems it because the boost comes on so much quicker at a lower rpm, that its audible over the engine noise.
The engine is much quieter at 3,000 rpms, then at 6,000. So if you hit 15 psi at 6,000 rpms stock, and then tune your car, you may hit 15psi at 3,500 rpms, making the spool noise more noticeable
Oh and the turbos on the lnfs aren't big enough to scream like a diesel turbo....
The engine is much quieter at 3,000 rpms, then at 6,000. So if you hit 15 psi at 6,000 rpms stock, and then tune your car, you may hit 15psi at 3,500 rpms, making the spool noise more noticeable
Oh and the turbos on the lnfs aren't big enough to scream like a diesel turbo....
03-05-2013, 12:57 PM
#5
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
hmmm ok yeah sounds about right 
I don't know if louder is correct. It may be a bit louder at 25 psi, but I have a different theory....Maybe it just seems it because the boost comes on so much quicker at a lower rpm, that its audible over the engine noise.
The engine is much quieter at 3,000 rpms, then at 6,000. So if you hit 15 psi at 6,000 rpms stock, and then tune your car, you may hit 15psi at 3,500 rpms, making the spool noise more noticeable
Oh and the turbos on the lnfs aren't big enough to scream like a diesel turbo....
The engine is much quieter at 3,000 rpms, then at 6,000. So if you hit 15 psi at 6,000 rpms stock, and then tune your car, you may hit 15psi at 3,500 rpms, making the spool noise more noticeable
Oh and the turbos on the lnfs aren't big enough to scream like a diesel turbo....
03-05-2013, 03:11 PM
#6
Member
Join Date: 05-14-2012
Location: Colts Neck, NJ
Posts: 57
These cars keep the turbo fairly isolated, sadly.. if the intake system were more open and closer to the firewall it would be more audible.
I only hear the bypass valve once in a while at cruising speeds or during WOT pulls if I can take my mind off of the exhaust note
Still I miss the jet engine sounds my Regal T used to make... I swapped the airbox for a cone filter and it was night and day (though usually that means you compromise intake air temps a bit, if I'm not mistaken.)
I only hear the bypass valve once in a while at cruising speeds or during WOT pulls if I can take my mind off of the exhaust note
Still I miss the jet engine sounds my Regal T used to make... I swapped the airbox for a cone filter and it was night and day (though usually that means you compromise intake air temps a bit, if I'm not mistaken.)
