Exhaust note question please
Thread Starter
Burning Brakes
Joined: Nov 2017
Posts: 1,060
Likes: 80
From: Fort Mill, SC
very mild cam comparable to a stock 89 l98 cam. 206/214 on a 112 lsa iirc. Nothing worth noting. Still has mufflers, they're just built into the tips there. They are a chambered (basically glasspack) type. The old monza style muffler is what they are modeled after. Mid america sells them and I love them.
As far as drone, top off or on it doesn't bother me. Lugging it around 1600 gets a little and running it up past 3k gets some too but just cruising I only really hear wind noise. Way better than the 3rd gen my cousin has or the 67. I found it not really any worse than the stock type muffler they replaced. There is a crossover tube on the rear y though. Top on it is dead quiet... like surprised me how quiet. The nice thing is the tips protrude out under the bumper. Iirc that helps as well as turndowns.
As far as drone, top off or on it doesn't bother me. Lugging it around 1600 gets a little and running it up past 3k gets some too but just cruising I only really hear wind noise. Way better than the 3rd gen my cousin has or the 67. I found it not really any worse than the stock type muffler they replaced. There is a crossover tube on the rear y though. Top on it is dead quiet... like surprised me how quiet. The nice thing is the tips protrude out under the bumper. Iirc that helps as well as turndowns.
L98 is a better sounding motor than the lt1. Ive read that many times. thank you for the videos.. great sound..
Le Mans Master
Joined: Aug 2017
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From: New Jersey
Last edited by 84 4+3; Aug 1, 2018 at 11:17 AM.
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
When I hear the newer mustangs and camaros I hear each cylinder fire, its very defined. In my 96 its muddy and nothing defined.
Im wondering, whats creating this sort of mixed sound? If I went with "performance" catalytic converters would it help? Or is it the stock resonance muffler that mixes it up?
do you guys know what I mean?
Im wondering, whats creating this sort of mixed sound? If I went with "performance" catalytic converters would it help? Or is it the stock resonance muffler that mixes it up?
do you guys know what I mean?
I did it specifically to eliminate the individual cylinder firing sound (like an old V8 boat, IMO) that my C6 exhibited. I TOTALLY FAILED in my mission at the time, but set out to do the same thing with my 'Vette Kart project and feel that I totally succeeded. A "curvey" exhaust dramatically reduces that individual cylinder firing sound, leaving what I consider to be a "delicious, bubbly" V8 exhaust sound. So, straight piping with minimal bends helps with what you want, I believe.
Quicker and more attainable however is to retard your ignition timing at idle. The more you retard it, the more you'll hear the individual cylinders firing. It works and the effect is dramatic.
Thread Starter
Burning Brakes
Joined: Nov 2017
Posts: 1,060
Likes: 80
From: Fort Mill, SC
I know what you mean. I BET, that I've put MORE TIME INTO THIS CRAP than everyone who's posted on this thread, combined.
I did it specifically to eliminate the individual cylinder firing sound (like an old V8 boat, IMO) that my C6 exhibited. I TOTALLY FAILED in my mission at the time, but set out to do the same thing with my 'Vette Kart project and feel that I totally succeeded. A "curvey" exhaust dramatically reduces that individual cylinder firing sound, leaving what I consider to be a "delicious, bubbly" V8 exhaust sound. So, straight piping with minimal bends helps with what you want, I believe.
Quicker and more attainable however is to retard your ignition timing at idle. The more you retard it, the more you'll hear the individual cylinders firing. It works and the effect is dramatic.
I did it specifically to eliminate the individual cylinder firing sound (like an old V8 boat, IMO) that my C6 exhibited. I TOTALLY FAILED in my mission at the time, but set out to do the same thing with my 'Vette Kart project and feel that I totally succeeded. A "curvey" exhaust dramatically reduces that individual cylinder firing sound, leaving what I consider to be a "delicious, bubbly" V8 exhaust sound. So, straight piping with minimal bends helps with what you want, I believe.
Quicker and more attainable however is to retard your ignition timing at idle. The more you retard it, the more you'll hear the individual cylinders firing. It works and the effect is dramatic.
Very interesting.. so the sound from the 70's engines we hear is essentially destroyed by what I bet is super high ignition timing at idle for emissions.
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
IDK. I'm not sure that I'd call '90's engines' ignition timing "super advanced". I'd guess it's similar to base timing in '70's motors, but not sure the general specs by decade.
I had a theory that the timing on my LS2 was quite retarded for emissions reasons...but someone in that exhaust threat that I linked above (IIRC) claimed that base timing is around 12*...IDK if that's true or accurate or not...the exhaust doesn't sound that way to me, but maybe.
I had a theory that the timing on my LS2 was quite retarded for emissions reasons...but someone in that exhaust threat that I linked above (IIRC) claimed that base timing is around 12*...IDK if that's true or accurate or not...the exhaust doesn't sound that way to me, but maybe.
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
IDK. I'm not sure that I'd call '90's engines' ignition timing "super advanced". I'd guess it's similar to base timing in '70's motors, but not sure the general specs by decade.
I had a theory that the timing on my LS2 was quite retarded for emissions reasons...but someone in that exhaust threat that I linked above (IIRC) claimed that base timing is around 12*...IDK if that's true or accurate or not...the exhaust doesn't sound that way to me, but maybe.
I had a theory that the timing on my LS2 was quite retarded for emissions reasons...but someone in that exhaust threat that I linked above (IIRC) claimed that base timing is around 12*...IDK if that's true or accurate or not...the exhaust doesn't sound that way to me, but maybe.
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Team Owner
Joined: Aug 2004
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From: Park City Utah
Yeah....I'm stuck on exhaust shape. In the thread I linked it's all explained out over the thread...but you look at other cars that had the LS2....exact same engine, yet they sound much better (IMO)...certainly much different than the LS2 does in the C6. Why? The only diff is the exhaust shape (routing). In the GTO, and CTS-V, the exhaust system has way more bends in it, and they sound better/different/good. I applied that theory to my 'Vette Kart exhaust and it was totally successful. It sounded like poo with the stock Y pipe into a 2.5" straight through Magnaflow....now it sounds delicious with a bendy exhaust and two straight through muffs.
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
Yeah....I'm stuck on exhaust shape. In the thread I linked it's all explained out over the thread...but you look at other cars that had the LS2....exact same engine, yet they sound much better (IMO)...certainly much different than the LS2 does in the C6. Why? The only diff is the exhaust shape (routing). In the GTO, and CTS-V, the exhaust system has way more bends in it, and they sound better/different/good. I applied that theory to my 'Vette Kart exhaust and it was totally successful. It sounded like poo with the stock Y pipe into a 2.5" straight through Magnaflow....now it sounds delicious with a bendy exhaust and two straight through muffs.
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
Both these cars are LS2's (same heads/valve geometry) but have quite different sounds:
Mine: "Blaaaa-blaaaa-blaaaa-blaaaa-
https://youtu.be/7FyktHczjI0
His: La la la la la la la....Mmmmm
https://youtu.be/07jWp-jzQUs
Mine: "Blaaaa-blaaaa-blaaaa-blaaaa-
https://youtu.be/7FyktHczjI0
His: La la la la la la la....Mmmmm
https://youtu.be/07jWp-jzQUs
Le Mans Master
Joined: Aug 2017
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Likes: 1,490
From: New Jersey
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
No. That is way, way too far advanced for that engine speed. 18 is the most *I* have ever seen and that was on a low compression, aluminum headed SBC with a 234/244 cam.
Actual advance at idle should be ~12*-~15*, IMO.
Did you try retarding the bejeezus out of it to see how it changes the sound?
Actual advance at idle should be ~12*-~15*, IMO.
Did you try retarding the bejeezus out of it to see how it changes the sound?
Thread Starter
Burning Brakes
Joined: Nov 2017
Posts: 1,060
Likes: 80
From: Fort Mill, SC
No. That is way, way too far advanced for that engine speed. 18 is the most *I* have ever seen and that was on a low compression, aluminum headed SBC with a 234/244 cam.
Actual advance at idle should be ~12*-~15*, IMO.
Did you try retarding the bejeezus out of it to see how it changes the sound?
Actual advance at idle should be ~12*-~15*, IMO.
Did you try retarding the bejeezus out of it to see how it changes the sound?
Thread Starter
Burning Brakes
Joined: Nov 2017
Posts: 1,060
Likes: 80
From: Fort Mill, SC
Ok my tuner started working again. I tried lowering my idle advance all the way down to zero and I didnt notice a thing. So then I read some stuff on the interwebs and the recommendation was to lower the idle so I lowered to 550rpm.. It gave it a nice burble sound, nothing like a cam but it started to hunt just a little so Id have to tune that out if I decided to go that route.
I will try playing some more with advance.. maybe raise it even. I cant seem to retard it passed 0.
I will try playing some more with advance.. maybe raise it even. I cant seem to retard it passed 0.