05-26-2013, 05:58 PM | #1 |
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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, 06:02 PM | #2 |
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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, 06:03 PM | #3 |
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So we lose HP when it's closed?
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05-26-2013, 06:05 PM | #4 |
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05-26-2013, 06:05 PM | #5 |
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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, 06:09 PM | #6 |
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See your points....stock peak HP is 580
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05-26-2013, 08:20 PM | #7 |
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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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05-26-2013, 10:45 PM | #8 |
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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. |
05-26-2013, 10:52 PM | #9 | |
Ed
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Quote:
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05-27-2013, 01:51 AM | #10 |
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05-27-2013, 07:35 AM | #11 |
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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, 04:47 PM | #12 | |
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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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05-27-2013, 08:08 PM | #13 |
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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, 12:25 PM | #14 | |
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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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