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Old 12-18-2011, 10:06 PM   #1
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ZL1 exhaust

This may be a stupid question but i'm a newbee.What exhaust will be on the zl1 that can make 580 horsepower,stand up under a supercharger and be 50 states legal?
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Old 12-18-2011, 10:18 PM   #2
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it's a dual mode exhaust. Quiet while in the city and then loud while on the track
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Old 12-18-2011, 10:23 PM   #3
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Basically a redesigned corvette exhaust.

Edit: and since it's dual mode I suggest doing the mild to wild mod, since it prob won't be available when the ZL1 is finally released I'm pulling the fuse at the dealership before I even pull out. Talk about leaving a lasting impression!
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Old 12-18-2011, 10:42 PM   #4
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Found this on the dual mode for the Vette ...


Exhaust Tail Pipe Flow Control System Description and Operation

The Exhaust Flow Control (EFC) System enhances engine performance. The system has 2 modes of operation:

• Normal
• Competition


Normal Mode

When the vehicle is stationary with the engine running the exhaust flow control module (EFCM) commands the vacuum solenoid On, which supplies engine vacuum to both exhaust flow control valves. This causes the valves to close, diverting exhaust flow through a baffled path inside the mufflers. As vehicle speed increases, throttle position reaches 25 percent or greater and engine speed reaches 3500 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open, diverting exhaust flow through an un-baffled path inside the mufflers, thus enhancing engine performance.



Competition Mode

When traction control is driver disabled, vehicle speed increases, throttle position reaches 25 percent or greater and engine speed reaches 3000 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open; diverting exhaust flow through an un-baffled path inside the mufflers more frequently and at lower engine speeds.

The system also delays exhaust valve activity during wide-open throttle acceleration to inhibit exhaust valve actuation when the accelerator pedal is released and reapplied while shifting gears.

The EFCM has the ability to detect electrical malfunctions within the system. Any electrical malfunction detected will cause the system to be disabled and increased exhaust audibility.

The system uses the engine control module (ECM), body control module (BCM), electronic brake control module (EBCM), EFCM, exhaust flow control valve vacuum solenoid, vacuum reservoir, vacuum lines, 2 exhaust flow control valves and the serial data circuit to perform the system functions.
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Old 12-18-2011, 11:44 PM   #5
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Quote:
Originally Posted by SlingShot View Post
Found this on the dual mode for the Vette ...


Exhaust Tail Pipe Flow Control System Description and Operation

The Exhaust Flow Control (EFC) System enhances engine performance. The system has 2 modes of operation:

• Normal
• Competition


Normal Mode

When the vehicle is stationary with the engine running the exhaust flow control module (EFCM) commands the vacuum solenoid On, which supplies engine vacuum to both exhaust flow control valves. This causes the valves to close, diverting exhaust flow through a baffled path inside the mufflers. As vehicle speed increases, throttle position reaches 25 percent or greater and engine speed reaches 3500 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open, diverting exhaust flow through an un-baffled path inside the mufflers, thus enhancing engine performance.



Competition Mode

When traction control is driver disabled, vehicle speed increases, throttle position reaches 25 percent or greater and engine speed reaches 3000 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open; diverting exhaust flow through an un-baffled path inside the mufflers more frequently and at lower engine speeds.

The system also delays exhaust valve activity during wide-open throttle acceleration to inhibit exhaust valve actuation when the accelerator pedal is released and reapplied while shifting gears.

The EFCM has the ability to detect electrical malfunctions within the system. Any electrical malfunction detected will cause the system to be disabled and increased exhaust audibility.

The system uses the engine control module (ECM), body control module (BCM), electronic brake control module (EBCM), EFCM, exhaust flow control valve vacuum solenoid, vacuum reservoir, vacuum lines, 2 exhaust flow control valves and the serial data circuit to perform the system functions.
One just have to hope that all those Ms do work well together .
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Old 12-19-2011, 07:20 AM   #6
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That's some excellent information. Thank you.
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Old 12-19-2011, 07:53 AM   #7
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Would this be like the exhaust on the Z06 Corvette? If so I found a kit for this guy that has one that you had this hand held remote and a couple simple bolt on gadgets you attached to the exhaust pipes at the back where they opened and shut. And at any time even just sitting idling you can push remote button and all pipes open up. Or push again to go back to normal with two closed. Makes it sound fantastic around town when all four open. He loves it.
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Old 12-19-2011, 08:10 AM   #8
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^^^

For me I don't plan on messing with this car, gonna leave every thing stock. If I want to mess with stuff, that's what I still have the SS for.
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Old 12-19-2011, 10:37 PM   #9
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Originally Posted by Johnny1 View Post
Would this be like the exhaust on the Z06 Corvette? If so I found a kit for this guy that has one that you had this hand held remote and a couple simple bolt on gadgets you attached to the exhaust pipes at the back where they opened and shut. And at any time even just sitting idling you can push remote button and all pipes open up. Or push again to go back to normal with two closed. Makes it sound fantastic around town when all four open. He loves it.
yeah it will be the same. there will be mild to wild kits for them I am sure soon.

there is a fuse you could litterally wire in a switch yourself to just be able to turn it on and off. the system is real simple many peopel pull the fuse I would just wire in a little toggle switch to disable it 99% of the time as the mild to wild kits cost more $$$. the mild to wild kit has it own fob and can be programed to homelink visors as well.

the one on my Z06 (07) sucked. it was way to quite even with the fuse pulled. Guys will open up the mufflers and mod them to make it a bit louder by clamps on perforated tube in the muffler. I just ditched them and went borla. Borla sounds better IMO than the factory dual mode but it does have some drone. Have a friend with a B&B fusion which is there answer to the dual mode and works with the mild to wild setup as well.

the clip of the the ZL1 exhaust on Youtube is not too bad. If you listen to it and then a Z06 you will notice a huge volume difffernce. the grand sport dual mode is louder than my Z06 was.
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Old 12-19-2011, 11:05 PM   #10
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I plan to keep stock axle back exhaust but get headers w/ high flow cats. That should open her up and make it a little louder but I will still have the dual mode exhaust to stay quieter, if I choose.

I love the concept of dual mode exhaust.
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Old 12-20-2011, 08:02 AM   #11
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Rather have loud all the time, lol.
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Old 12-23-2011, 08:43 PM   #12
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So, electronics aside, would the exhaust system fit the chassis of a regular SS? Including headers and cats.
I'm not too fussed about the dual mode exhaust, I just want a good sound and flow.
The problem in Spain is that aftermarket exhausts are illegal unless approved by the government (which there are none of), or if it's OEM. So my only real option would be the ZL1.
Plus I must admit, it sounds awesome!

Last edited by Dan83; 12-23-2011 at 08:54 PM.
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Old 12-23-2011, 09:09 PM   #13
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Mild to wild...



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Old 12-24-2011, 04:46 PM   #14
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long tube headers and better sounding exhaust are in my program. The stock ZL1 exhaust is too pop and fart. It sounds like glass backs with the back fires etc. I will probably upgrade to flowmaster.
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Old 12-24-2011, 04:49 PM   #15
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Quote:
Originally Posted by adamgl View Post
Rather have loud all the time, lol.

I don't think so.. I believe the constant exhaust drone at 1900-2200 rpms may be irritating inside while trying to cruise on a trip....... worth considering.
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Old 12-24-2011, 04:56 PM   #16
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long tube headers and better sounding exhaust are in my program. The stock ZL1 exhaust is too pop and fart. It sounds like glass backs with the back fires etc. I will probably upgrade to flowmaster.
That "sounds" nice, but I read somewhere that if you add headers to the ZL1 motor you may be reducing the "boost" from the supercharger netting out at less RWHP. Heard that on one of the tech threads here! You may need to offset the reduced boost if you get headers by going to smaller pulley etc... then you have the warranty issues... (though you may have them anyway by adding headers). They say the headers don't result in much HP on the ZL1. Check it out before you jump. I'm sure we'll be seeing many tests of varying setups near term.
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Old 12-24-2011, 05:10 PM   #17
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That "sounds" nice, but I read somewhere that if you add headers to the ZL1 motor you may be reducing the "boost" from the supercharger netting out at less RWHP. Heard that on one of the tech threads here! You may need to offset the reduced boost if you get headers by going to smaller pulley etc... then you have the warranty issues... (though you may have them anyway by adding headers). They say the headers don't result in much HP on the ZL1. Check it out before you jump. I'm sure we'll be seeing many tests of varying setups near term.
Hmm. yes good advice. I will definately research first, change later.
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Old 12-24-2011, 06:54 PM   #18
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I don't think so.. I believe the constant exhaust drone at 1900-2200 rpms may be irritating inside while trying to cruise on a trip....... worth considering.
For some ppl. Louder the better for me. I have ARH headers, cats, X pipe and flowmaster super 40's on my SS. And it's great.

Quote:
Originally Posted by htron50 View Post
That "sounds" nice, but I read somewhere that if you add headers to the ZL1 motor you may be reducing the "boost" from the supercharger netting out at less RWHP. Heard that on one of the tech threads here! You may need to offset the reduced boost if you get headers by going to smaller pulley etc... then you have the warranty issues... (though you may have them anyway by adding headers). They say the headers don't result in much HP on the ZL1. Check it out before you jump. I'm sure we'll be seeing many tests of varying setups near term.
You'll still gain hp overall, will need a tune for the best effects though. You will lose a bit of boost b'c the engine is working more efficiently. But a pulley swap will fix that and give you an even better gain.
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Old 12-27-2011, 03:17 PM   #19
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if you want it louder all the time, all you have to do is pull the exhaust flap fuse.........
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Old 12-27-2011, 03:21 PM   #20
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Can't say I want to change the exhaust on the car when it comes. The production-intent model at the Fest sounded AMAZING...(someone said "pop & fart" above...in person, I didn't hear much of that) It sounds very similar to that ZR1 video a little higher up in this thread).

Later on perhaps I'll get a set of headers, pulley and a tune...but the dual-mode mufflers are staying, and that mild-to-wild system is almost certainly a Must-Have!
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Old 12-27-2011, 03:36 PM   #21
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Amen to it being quiet a idle. I leave for work @ 6:00am and the neighbors won't be to happy with a loud exhaust. Dual mode is just perfect for me.
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Old 12-27-2011, 04:42 PM   #22
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Can't say I want to change the exhaust on the car when it comes. The production-intent model at the Fest sounded AMAZING...(someone said "pop & fart" above...in person, I didn't hear much of that) It sounds very similar to that ZR1 video a little higher up in this thread).

Later on perhaps I'll get a set of headers, pulley and a tune...but the dual-mode mufflers are staying, and that mild-to-wild system is almost certainly a Must-Have!
When/if you find a good mild-wild system share it with us. I know Tom has some ideas on that too! Do share!
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Old 12-27-2011, 05:22 PM   #23
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Quote:
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When/if you find a good mild-wild system share it with us. I know Tom has some ideas on that too! Do share!
Yep!! Tom will be looking into it. Of course, no promises...but what better way for my car to spend its time until the snow melts than test-fitting a manual-control system?

I only really have three major mods I want to do, and this is one of them!...I'd like that option to leave the system's operation factory while in the "mild" setting...we'll have to see!
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Old 12-28-2011, 12:48 AM   #24
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Amen to it being quiet a idle. I leave for work @ 6:00am and the neighbors won't be to happy with a loud exhaust. Dual mode is just perfect for me.
Ha, it's my car! I could care less what my neighbors think!
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Old 12-28-2011, 01:54 AM   #25
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For anybody interested...Here's a series of pictures describing the Corvette's version of this system.
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