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05-26-2013, 06:58 PM
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#1 |
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I Carry!
Drives: 2013 CRT ZL1 Join Date: Jul 2011
Location: Fletcher, Ok
Posts: 2,722
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Does the NPP (dual mode) exhaust boost the ZL1 HP?
Corvettes benefit from this, does the ZL1?
If not why not? I have been wondering for some time, thanks for the input.
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05-26-2013, 07:02 PM
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#2 |
     
Drives: C6 Z06 Join Date: Jan 2010
Location: Dayton, MD
Posts: 1,645
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The ZL1 comes with it. The advertised HP is for the complete package. There is no zl1 without it with which to compare it
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05-26-2013, 07:03 PM
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#3 |
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I Carry!
Drives: 2013 CRT ZL1 Join Date: Jul 2011
Location: Fletcher, Ok
Posts: 2,722
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So we lose HP when it's closed?
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I am a Modaholic!! Please Help!! Do Not feed my addicition....See build...
http://www.camaro5.com/forums/showthread.php?t=261540 From Oklahoma, Join us on Facebook https://www.facebook.com/groups/okcamaros/ |
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05-26-2013, 07:05 PM
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#4 | |
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Drives: C6 Z06 Join Date: Jan 2010
Location: Dayton, MD
Posts: 1,645
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Quote:
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05-26-2013, 07:05 PM
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#5 |
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Drives: C6 Z06 Join Date: Jan 2010
Location: Dayton, MD
Posts: 1,645
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You're not in boost when you're cruising around with them closed, either.
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05-26-2013, 07:09 PM
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#6 |
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I Carry!
Drives: 2013 CRT ZL1 Join Date: Jul 2011
Location: Fletcher, Ok
Posts: 2,722
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See your points....stock peak HP is 580
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I am a Modaholic!! Please Help!! Do Not feed my addicition....See build...
http://www.camaro5.com/forums/showthread.php?t=261540 From Oklahoma, Join us on Facebook https://www.facebook.com/groups/okcamaros/ |
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05-26-2013, 09:20 PM
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#7 |
Drives: 2013 ZL1 Join Date: Oct 2012
Location: Dubai
Posts: 757
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the valves open at idle to 1000rpms, then shut for cruising then open up once again when you step on it. Someone did a comparison on the corvetteforum and saw no low-end gaisn from having them fully open, so more than anything its just a sound thing.
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 1150bhp Whipple 4.0 Supercharged 427ci Camaro ZL1 |
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05-26-2013, 11:45 PM
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#8 |
 Drives: Domestic Join Date: Apr 2012
Location: MI
Posts: 25
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The greatest restriction point on the ZL1 factory exhaust system is the converters, so it doesn't matter if the muffler flaps are open or shut from a peak HP stand point.
The NPP option on a 1LE doesn't give any increased advertised HP for this reason. The NPP was incorporated into the Camaro platform (starting with the ZL1 in '12) for exhaust note purposes. |
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05-26-2013, 11:52 PM
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#9 | |
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Ed
Drives: 2013 AGM Camaro 2SS/RS/1LE Join Date: Dec 2012
Location: Seattle, WA
Posts: 951
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Quote:
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05-27-2013, 02:51 AM
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#10 | |
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Est.1775
Drives: '15 Challenger Hellcat (sold) Join Date: Sep 2009
Location: SoCal
Posts: 5,499
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Quote:
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05-27-2013, 08:35 AM
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#11 |
      
Drives: 2012 ZL1 - #670 Join Date: Jun 2009
Location: Seminole, Fl.
Posts: 8,009
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Does anyone know if the NPP is programed the same on the ZL1 as the other Camaros, or did they us something different.
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05-27-2013, 05:47 PM
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#12 | |
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Drives: 2013 ZL1 Join Date: Oct 2012
Location: Dubai
Posts: 757
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Quote:
This is what I personally think and not necessarily true. One way to find out is to see if the valve remains open on the 1LEs at idle.
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1150bhp Whipple 4.0 Supercharged 427ci Camaro ZL1 |
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05-27-2013, 09:08 PM
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#13 |
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Drives: Camaro's, always have, always will. Join Date: Oct 2010
Location: Home of the brave
Posts: 4,851
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...the valves open up around 3,200 RPM. That's when the thunder of the Chevy god's roar to the high heavens.
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05-28-2013, 01:25 PM
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#14 | |
Drives: 2013 ZL1 Join Date: Oct 2011
Location: tangent or
Posts: 2,985
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Quote:
on the vette's the cars with NPP are rated 8hp more. In 2008 when i bought my Z51 NPP cars were rated at 438 and non-npp cars were rated at 430. since the CTS-V is 556 and the only difference is the airbox and exhaust seems logical could be gaining some of the extra power from the exhaust.
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