How does adding CAI/tune make exhaust sound better?
12-20-2007, 10:34 PM
#11
5th Gear Member
Join Date: Mar 2007
Location: CT
Posts: 2,209
RE: How does adding CAI/tune make exhaust sound better?
ORIGINAL: thewarmachine
Isn't it obvious...... when a new tune is installed the little man who sits in the H of the H-pipe and beats on his little drum to make the sound gets more air to breathe and can therefore make better drumbeats. When an X-pipe is installed, there is no comfortable place for the little man to sit. Hence he gets blown out the rear, and the only thing left to hear is the empty Chef Boyardee cans he left tied up in little trash bags hanging in the cross of the X.
Isn't it obvious...... when a new tune is installed the little man who sits in the H of the H-pipe and beats on his little drum to make the sound gets more air to breathe and can therefore make better drumbeats. When an X-pipe is installed, there is no comfortable place for the little man to sit. Hence he gets blown out the rear, and the only thing left to hear is the empty Chef Boyardee cans he left tied up in little trash bags hanging in the cross of the X.
12-21-2007, 12:04 AM
#13
5th Gear Member
Join Date: Jan 2006
Location:
Posts: 4,333
RE: How does adding CAI/tune make exhaust sound better?
you will notice the difference mostly at WOT, when the tune has the most difference.
also, the tune changes timing and such, and the car will sound a little different, if you really think you have the ear for that.
but most of the noise from a big open intake, comes from the intake itself, the actual induction noise. ford puts a lot of money (well some at least) into quieting the stock intake, and an open intake is basically a direct path at WOT through the intake manifold all the way down to the heads, so that noise is projected better through the aftermarket intake, plus your sucking more air in and the actual noise the intake itself makes.
also, the tune changes timing and such, and the car will sound a little different, if you really think you have the ear for that.
but most of the noise from a big open intake, comes from the intake itself, the actual induction noise. ford puts a lot of money (well some at least) into quieting the stock intake, and an open intake is basically a direct path at WOT through the intake manifold all the way down to the heads, so that noise is projected better through the aftermarket intake, plus your sucking more air in and the actual noise the intake itself makes.
12-21-2007, 01:56 AM
#14
3rd Gear Member
Join Date: Apr 2007
Location: Pa
Posts: 763
RE: How does adding CAI/tune make exhaust sound better?
ORIGINAL: 300GT
If most aftermarket tunes are leaner than the factory tune, then why is it that most people that I know that have aftermarket tunes have lots of black residue on/around exhaust tips, whereas I (with stock tune) have no black residue. I would think it would be the other way around. Please elaborate. Thanks.
ORIGINAL: GT Bob
Actually, most tunes lean out the fuel, making LESS unburnt fuel in the exhaust... The S197 is ridiculously rich from the factory. In fact, alot of tunes also disable alot of the cars ability to dump in extra fuel at WOT to cool the cats and exhaust manifolds.
It boils down to (as was already stated) simply more air in and more air out.
Actually, most tunes lean out the fuel, making LESS unburnt fuel in the exhaust... The S197 is ridiculously rich from the factory. In fact, alot of tunes also disable alot of the cars ability to dump in extra fuel at WOT to cool the cats and exhaust manifolds.
It boils down to (as was already stated) simply more air in and more air out.
To get power out of these cars, the fuel needs to be leaned out to the 12.8-13.0 range, and as an added measure most diasble most of those emissions fuel adders as well. The black carbon is likely from disabling the emissions and overtemp controls. It's much more pronounced with canned tunes than it is from mail order tunes. Canned tunes tend to run richer due to the fact that they have to able to be used on a far wider range of cars, while the mail orders can get it closer, but they still aren't exact.
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