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Old 03-01-2009, 02:12 AM   #1
HeavyRightFooT
 
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Video: 30hp Exhaust gain on a LS3 Corvette

Hi Guys,

Was browsing Youtube and found this. Interesting to see how the LS3 benefits from a well thought exhaust setup . (in this case Kooks+ Corsa). Includes dino.



Hope the Camaro setups will allow for the same gains.

Mine will sure end up sounding close to this sooner or later

HeavyRightFooT
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Old 03-01-2009, 06:17 AM   #2
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:(

What's wrong with GM? In an LS3-equipped premium model, why would they fail at exhaust design, a science that should be very easy for them? The usual design compromises required on an inexpensive grocery getter don't apply to a C6, which is expected to be loud and expensive. In fact, they could even make it quiet and still not lose HP, without costing too much. It's just not that hard, which is why you can buy a new exhaust system for a few hundred bucks and bolt it on yourself...
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she really underestimates the damage i would do to her reproductive organs
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Old 03-01-2009, 06:29 AM   #3
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amen
all hail LS3
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Old 03-01-2009, 08:11 AM   #4
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There was no mention about tuning. Putting 1 7/8 headers on an LS3 requires tuning to keep everything nice and safe.
My GTO was dangerously lean without tuning with 1 7/8 headers.

So they may have (not mentioned) tuned the Vette for the new exhaust setup.

By the way my GTO made 36 rwhp (with tuning) with the same setup. And trust me, that setup is crazy loud.
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Old 03-01-2009, 09:11 AM   #5
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Quote:
Originally Posted by theholycow View Post
:(

What's wrong with GM? In an LS3-equipped premium model, why would they fail at exhaust design, a science that should be very easy for them? The usual design compromises required on an inexpensive grocery getter don't apply to a C6, which is expected to be loud and expensive. In fact, they could even make it quiet and still not lose HP, without costing too much. It's just not that hard, which is why you can buy a new exhaust system for a few hundred bucks and bolt it on yourself...
J/K right? Don't see the failure here. I have never seen or heard of a factory exhaust system that could not be topped by aftermarket. That is just the way it is.
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Old 03-01-2009, 09:45 AM   #6
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J/K right? Don't see the failure here. I have never seen or heard of a factory exhaust system that could not be topped by aftermarket. That is just the way it is.
Not kidding at all. Those engineers aren't fools; in fact, they're some of the best engineers in the world. Therefore, you can't tell me that they're incapable of designing a decent exhaust system (but the guys at Corsa can, probably with less budget and less resources).

In so many other parts of the car, they put the best technology available -- it's not a cheap car, a grocery getter, a daily driver, or otherwise subject to the usual compromises for noise or cost. What reason would they have to give the C6 an exhaust that eats 30hp?
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she really underestimates the damage i would do to her reproductive organs
http://allOffTopic.com is the place for all the naughty stuff you can't get away with on this forum...
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Old 03-01-2009, 09:48 AM   #7
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I would take a stab and guess that the factory engineers are held to more stringent standards than the other guys. I.E. you can order somethings from GMPP that are stamped "off road" use only. Where as the other shops are way more lenient when it comes to that stuff. But I could be wrong
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Old 03-01-2009, 10:39 AM   #8
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Remember they have a fair number of other factors to take into consideration.

As mentioned without a tune you'd be running a bit (or maybe alot) lean, you now need to push more fuel in for that HP. mileage just took a dive.

Crazy loud is awesome, but then again it isnt. Not everyone wants to "HEAR" their car, and a fair larger number don't want to hear ours.

Larger exhaust does weigh more, people bitch about that too.
We pay more to put larger exhaust on they would to. Now yes they get a bump because they aren't replacing after build, but still.
As above if they put it on all vehicles then they hurt the fleet milage, If they don't they lose the volume buy and the price per unit of the option goes up again. In addition, beacuse they have to pay up front on a part that "might' not get used they have to incorporate some of that cost to vehicles that would't get it and the base price goes up.

Now for one part that may actually not be significant. But how many parts are there on a car that can be teaked, massaged or just outright swapped for a performace gain?

Builder engineers, are trying to mass market appeal. Unfortunately when you are trying to appeal to a large demographic and give everyone something they want you also give everyone something to hate.

The problem with trying to stay in the middle is you get shot at by both sides.
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Old 03-01-2009, 10:42 AM   #9
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Originally Posted by theholycow View Post
Not kidding at all. Those engineers aren't fools; in fact, they're some of the best engineers in the world. Therefore, you can't tell me that they're incapable of designing a decent exhaust system (but the guys at Corsa can, probably with less budget and less resources).

In so many other parts of the car, they put the best technology available -- it's not a cheap car, a grocery getter, a daily driver, or otherwise subject to the usual compromises for noise or cost. What reason would they have to give the C6 an exhaust that eats 30hp?
Not every person on the planet that purchases a corvette wants it rumble at 100dB. They also are forced to build a car that will run in -50 degree weather of northern canada, and 120+ degree weather of latin America. With the emissions testing and regulations on car manufacturers, its hard to offer systems like corsa and kooks.

I have met some of the corvette designers. They are intensely passionate, and very good at what they do.
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Old 03-01-2009, 11:00 AM   #10
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Who said GM couldn't design a this exhaust? We all know they could design it, there are many reasons why they wouldn't.

I have Kooks long tube headers and a corsa extreme cat-back on my 07 corvette between that, heads and a tune I picked up 60 rwhp. However, it has not be without compromise, even with an isolated tunnel brace I get more heat coming into the car from the center console, and I have not been able to get all of the popping out of the exhaust on decel.

Plus you can hear the exhaust valves, as headers are just not a quite as exhaust manifolds.

plus if you need more that 420 some hp in a vette, you can get a z06
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Old 03-01-2009, 01:15 PM   #11
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Thanks, now I get it. There are still some of the same compromises, even in a Corvette.
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Quote:
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she really underestimates the damage i would do to her reproductive organs
http://allOffTopic.com is the place for all the naughty stuff you can't get away with on this forum...
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Old 03-01-2009, 01:40 PM   #12
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.... and, if the exhaust was perfect/loud fromthe factory, they wouldn't make any money selling their GMPP stuff would they?

.... and remember, exhaust sound is a very personal thing. So no matter what it sounds like from factory, you can be guaranteed that it won't satisfy the majority.
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Old 03-01-2009, 01:44 PM   #13
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Quote:
Originally Posted by theholycow View Post
:(

What's wrong with GM? In an LS3-equipped premium model, why would they fail at exhaust design, a science that should be very easy for them? The usual design compromises required on an inexpensive grocery getter don't apply to a C6, which is expected to be loud and expensive. In fact, they could even make it quiet and still not lose HP, without costing too much. It's just not that hard, which is why you can buy a new exhaust system for a few hundred bucks and bolt it on yourself...
You fail. Good day sir.

Quote:
Originally Posted by HeavyRightFooT View Post
Hi Guys,

Was browsing Youtube and found this. Interesting to see how the LS3 benefits from a well thought exhaust setup . (in this case Kooks+ Corsa). Includes dino.



Hope the Camaro setups will allow for the same gains.

Mine will sure end up sounding close to this sooner or later

HeavyRightFooT
The cat-back nets very little gains. The NPP exhaust flows very well to begin with. 99% of that power came from the longtubes, HFCs, and the tune.
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Old 03-01-2009, 01:46 PM   #14
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plus if you need more that 420 some hp in a vette, you can get a z06
You rang? lol I have American Racing Headers on my Z along with the 630 pkg from LPE. It's loud and i love it
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