NPP question
Thread Starter
Racer
Joined: Dec 2009
Posts: 285
Likes: 1
From: Auburn Alabama
NPP question
Hey guys, I know we all own Corvettes and didnt buy them for gas mileage, but I just added NPP on my 06 Z51 and was wondering if anyone has compared gas mileage with the exhaust open or closed?
Melting Slicks
Joined: Jan 2003
Posts: 2,026
Likes: 178
From: Jacksonville, NC
Team Owner
Joined: Nov 2007
Posts: 45,265
Likes: 8,541
From: Rochester, NY
Not sure if anyone has measured to see if there is a difference, you may try a search if no one replies to your post with any data. I leave mine open 100% of the time but drive it pretty hard so I can not offer any worthwhile data or opinion.
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
Well in stock form, the NPP is designed to open around 3500 rpm, not the ideal range for optimum gas milage. Even if you left the NPP open at all times the difference would be minimal, if any. Best gas milage is obtained below 1800 rpm in 6th gear.
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Le Mans Master
Joined: Oct 2005
Posts: 6,503
Likes: 2
From: Oklahoma City OK
I have had NPP on both of my C6's and didnt notice a diffference in gas mileage.
BTW one of the reasons I got my first vette was because it got the same or better MPG than my modified Nissan Maxima, not to mention performance advantage. Been stuck on Vettes ever since.
BTW one of the reasons I got my first vette was because it got the same or better MPG than my modified Nissan Maxima, not to mention performance advantage. Been stuck on Vettes ever since.
Le Mans Master
Joined: Apr 2006
Posts: 5,933
Likes: 13
From: The Beautiful Inland Empire WA.
.....the engine is just an air pump and if it is not working as hard to pump out the exhaust gases, it just makes sense that you'd get (marginally) better MPG. This of course presumes that you can keep them open at lower RPM's while cruising.
Last edited by C6NRED; Jan 23, 2010 at 08:30 PM.
CF Senior Member
Joined: Sep 2009
Posts: 363
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