Gallardo exhaust
05-10-2011, 08:47 AM
#16
Drifting
Everything has an effect, compression, 2V vs. 4V, number of cylinders, crank, exhaust pipe length, shape, diameter, restriction, dual vs. single - everything, even the shape of the camshaft.
Just in 10 cylinder engines - viper's sound lousy, Gallardo's nice and LOUD, Carrera GT's are a masterpiece.
I lucked out and created one of the best sounding V8's with my 85 Euro, a lot of different factor's contributed to that.
Here are some great sounds;
a lopey big block Ford 427 SO- better than that F 355 at speed
http://www.youtube.com/watch?v=DZ3mNQEAFJQ
The CGT unlike any other street car (annoying alarm)
http://www.youtube.com/watch?v=WnezG5FV30I
Just in 10 cylinder engines - viper's sound lousy, Gallardo's nice and LOUD, Carrera GT's are a masterpiece.
I lucked out and created one of the best sounding V8's with my 85 Euro, a lot of different factor's contributed to that.
Here are some great sounds;
a lopey big block Ford 427 SO- better than that F 355 at speed
http://www.youtube.com/watch?v=DZ3mNQEAFJQ
The CGT unlike any other street car (annoying alarm)
http://www.youtube.com/watch?v=WnezG5FV30I
05-10-2011, 12:13 PM
#17
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
One REASON why a V-10 Viper sounds horrible is it is a 90 degree V-10(easier to make on a V-8 line) which makes it an odd fire. One needs to look at the angle of the V to determine the required firing order which has much to do with the sound. 180 degree V-12s sound great and are just about the best balanced engine configuration....
05-10-2011, 04:51 PM
#19
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
One REASON why a V-10 Viper sounds horrible is it is a 90 degree V-10(easier to make on a V-8 line) which makes it an odd fire. One needs to look at the angle of the V to determine the required firing order which has much to do with the sound. 180 degree V-12s sound great and are just about the best balanced engine configuration....
I'm working on a paper that supports using 13, 17 or 19 combustor cans (sort of the same as 'cylinders' but in a gas turbine) to help with some harmonics and flame stability issues. So far no believers among current manufacturers, although one Japanese engine builder already puts microphones on the cans to detect potentially-destructive reversion pulses.
05-10-2011, 06:54 PM
#21
Rennlist Member
this is it.
The Gallaro V-10 is a 72 degree V which with five crank throws results in an even firing order. So you are hearing two five cylinder "engines". The Ferrari V-8 sounds like a "Ferrari" because although a 90 Degree V-8 it uses a flat crankshaft and runs as two four cylinder engines. Most V-8s including 928s are not even firing they must bang off two cylinders on one bank one after the other.....which with dual exhaust is the hotrod V-8 sound, the burble. As noted if you run your odd fire V-8 into a loud Single exhaust or use a couple Y pipes it smooths out the sound giving a higher RPM sound. The V-10 Viper using a 90 degree V also has an ODD exhaust note due to the firing being uneven. The classic Harley sound is becuse it is a V twin with one crank journal and fires Bang bang then has a long pause as the crank goesthe rest of the way around and bang bang. So no matter what you do to the exhaust it is largely the spacing of the bangs that determines the overall note. The Gallaro does have an active exhaust flap which opens up more when you wish to make noise.....Short answer is a 6,500 Rpm V-8 is never going to sound like a V-10 or V-12 or a Harley 
You can however easily make it sound like a Mustang or Camero......
The more cylinders you have the more bangs per minute at the same RPM....4 cycle fires the cylinder every other RPM. So the Harley bangs 3,000 times @3,000 RPM, V-8 bangs 12,000 times @ 3,000 Rpm, V-10 is @15,000 times.....so no way to make 12,000 bangs sound like 15,000 or 3,000 ! now a 12 cyliner @ 3,000 RPM gets you a magical 18,000 pulses per minute.
You can however easily make it sound like a Mustang or Camero......The more cylinders you have the more bangs per minute at the same RPM....4 cycle fires the cylinder every other RPM. So the Harley bangs 3,000 times @3,000 RPM, V-8 bangs 12,000 times @ 3,000 Rpm, V-10 is @15,000 times.....so no way to make 12,000 bangs sound like 15,000 or 3,000 ! now a 12 cyliner @ 3,000 RPM gets you a magical 18,000 pulses per minute.
05-16-2011, 01:35 AM
#24
Been selling Twinkies on Ebay,
have some extra cash right now.
Rennlist Member
have some extra cash right now.
Rennlist Member
^That sounds suspiciously like your "one lap of Laguna Seca in the rain" Youtube video...^
Which is one of my faves for the pucker factor, BTW!
EDIT: This was my post#928! Dennis, I think we met back at DEVEK day (2004?) I hope our paths will cross again someday...
Which is one of my faves for the pucker factor, BTW!
EDIT: This was my post#928! Dennis, I think we met back at DEVEK day (2004?) I hope our paths will cross again someday...
Last edited by Erik N; 05-16-2011 at 01:51 AM.
05-16-2011, 12:58 PM
#26
Craic Head
Lifetime Rennlist
Member
Lifetime Rennlist
Member
I'm surprised no one mentioned this. I saw on Top Gear that the Gallardo has 'variable' exhaust. Clarkson loved it, called it a 'bark' when you step on it.
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
I was thinking of putting in an exhaust cutout that does this on my car so that under normal conditions it's fully muffled but under WOT (or possibly some other user input) it would open up prior to the muffler for track days or testing on the dyno.
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
I was thinking of putting in an exhaust cutout that does this on my car so that under normal conditions it's fully muffled but under WOT (or possibly some other user input) it would open up prior to the muffler for track days or testing on the dyno.
05-16-2011, 01:17 PM
#27
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
[QUOTE=Mike Frye;8558297]I'm surprised no one mentioned this. I saw on Top Gear that the Gallardo has 'variable' exhaust. Clarkson loved it, called it a 'bark' when you step on it.
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
Post # 7 ..." The Gallaro does have an active exhaust flap which opens up more when you wish to make noise....." Perhaps you too have me on "ignore" Yea I know my posts get long ,hard to read,easy to misunderstand, and down right boring for the most part.....The cutout is a good idea in my opinion I have considered for the old very brown 1980. Since it is not fast it might as well be LOUD only problem with that is everyone KNOWS when you miss a shift !
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
Post # 7 ..." The Gallaro does have an active exhaust flap which opens up more when you wish to make noise....." Perhaps you too have me on "ignore"
Yea I know my posts get long ,hard to read,easy to misunderstand, and down right boring for the most part.....The cutout is a good idea in my opinion I have considered for the old very brown 1980. Since it is not fast it might as well be LOUD only problem with that is everyone KNOWS when you miss a shift !
05-16-2011, 02:53 PM
#28
Craic Head
Lifetime Rennlist
Member
Lifetime Rennlist
Member
[QUOTE=James Bailey;8558354]
Jim,
Sorry, I missed it in your post. I certainly don't have you on 'ignore'. If they had a setting for 'pay attention to this' I'd have you on that.
I saw several posts that talked about the number of cylinders and the firing order and although I read yours, I missed the line about the exhaust flap and since IMO that's the one difference between this car and any other car with the same firing order and number of cylinders I guess I was looking for someone to lead with that.
WRT the exhaust cutout: I have way too much back pressure in my system with the 2-into-1-into-2 exhaust of my '85 and as a result I keep blowing it off at the cats before my crossovers. If I could eliminate some of that I think it would have more power. And right now, I think you could tell when I miss a shift already, so that's not a factor.
I'm surprised no one mentioned this. I saw on Top Gear that the Gallardo has 'variable' exhaust. Clarkson loved it, called it a 'bark' when you step on it.
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
Post # 7 ..." The Gallaro does have an active exhaust flap which opens up more when you wish to make noise....." Perhaps you too have me on "ignore" Yea I know my posts get long ,hard to read,easy to misunderstand, and down right boring for the most part.....The cutout is a good idea in my opinion I have considered for the old very brown 1980. Since it is not fast it might as well be LOUD only problem with that is everyone KNOWS when you miss a shift !
Essentially they said that at WOT, it opens up and there's a different exhaust path, which bypasses either part or all of the muffler.
Post # 7 ..." The Gallaro does have an active exhaust flap which opens up more when you wish to make noise....." Perhaps you too have me on "ignore"
Yea I know my posts get long ,hard to read,easy to misunderstand, and down right boring for the most part.....The cutout is a good idea in my opinion I have considered for the old very brown 1980. Since it is not fast it might as well be LOUD only problem with that is everyone KNOWS when you miss a shift !Sorry, I missed it in your post. I certainly don't have you on 'ignore'. If they had a setting for 'pay attention to this' I'd have you on that.
I saw several posts that talked about the number of cylinders and the firing order and although I read yours, I missed the line about the exhaust flap and since IMO that's the one difference between this car and any other car with the same firing order and number of cylinders I guess I was looking for someone to lead with that.
WRT the exhaust cutout: I have way too much back pressure in my system with the 2-into-1-into-2 exhaust of my '85 and as a result I keep blowing it off at the cats before my crossovers. If I could eliminate some of that I think it would have more power. And right now, I think you could tell when I miss a shift already, so that's not a factor.
