true duals for 93-02 f bodys
#3
A guy who knows his stuff told me that duals will decrease power cause their isn't enough back pressure( told me to get rid of the tsp duals and switch back to y-pipe with cutout and catback). True or false?
#4
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True duals sound better than any cutout ever will. I have True duals with sweet thunders. Doesn't get any better than that.
I am pretty sure a y pipe + cutout will make nearly the same power as the texas speed true dual setup. Now mine is ran over the axles because I do not want to not have tips on my T/A. Also I don't think a cutout gives you very much back pressure either. I could be wrong about that tho.
I am pretty sure a y pipe + cutout will make nearly the same power as the texas speed true dual setup. Now mine is ran over the axles because I do not want to not have tips on my T/A. Also I don't think a cutout gives you very much back pressure either. I could be wrong about that tho.
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If you want true duals over the axle and don't want to mess with doing too much fabricating, bassoni is what you want... but pricey if I remember. I think all over bolt on true dual systems are dumped. I personally have been thinking about getting the Texas Speed true dual system. Just gotta decide if I can live without tips.
#7
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screw this negative talk about duals, im havin a set fabbed right now, im in afgan, ive had friends with them, and i have always been told the best things, as long as clearence is takin into account, and out the back customs with cut-outs are always a must!!!!!!
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#8
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"Needing backpressure" is an absolute bullshit myth - ANY backpressure is a bad thing. Anyone who argues for backpressure doesn't understand exhaust scavenging. Also, going from a 3" pipe to a 4" pipe will actually decrease exhaust velocity, which can hurt power. Not saying it does for that specific setup, but it can.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
#9
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yeah, i think that people get confused thinking that backpressure is what u need when what they are actually thinkin of is exhaust velocity. I was hopin that the new setup will infact add some power over the y-setup now that my car has a healthy cam.
#10
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I think people need to look at where they want their power -- across the RPM band is a great ideal, but perhaps true duals changes that. For me, I really like the low to mid-band power the most -- that torque is fun!
Racers will likely car more about upper-RPM bands... It would be great if more people post dyno charts of both before and after major exhaust changes -- it will benefit us all, and we will have numbers to learn from instead of a lot of opinions...
Racers will likely car more about upper-RPM bands... It would be great if more people post dyno charts of both before and after major exhaust changes -- it will benefit us all, and we will have numbers to learn from instead of a lot of opinions...
"Needing backpressure" is an absolute bullshit myth - ANY backpressure is a bad thing. Anyone who argues for backpressure doesn't understand exhaust scavenging. Also, going from a 3" pipe to a 4" pipe will actually decrease exhaust velocity, which can hurt power. Not saying it does for that specific setup, but it can.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
Last edited by libertyforall1776; 08-15-2010 at 09:50 PM.
#11
I'm having a bassani true dual slapped on my lowered TA by Roger's Exhaust in Fontana after seeing 2 other fbod guys post good pics and make good comments about it all. It's costing me a few dollars but I decided to move forward with it.
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All i can say is if you have an aftermarket torque are goodluck with making it fight right without hitting the ground because true duals suck! been through 3 systems guys even a texas speed one and it was by far the worst i've ever seen up close. Just bought borla 3 inch catback an a brand new y-pipe from a friend parting out a trans-am
#14
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Im kinda wondering about the whole clearence thing myself, ive got a tunnel mount TA and know thats gonna be a problem for this guy, i know the bolt-on kits wont work. Ive seen the TSP sysems, and they seem to have the worst clearence of them all, had a few friends with em. The guy wants to keep my cats, told the wife it needs em, even if they dont function, so i figured id run no mufflers if the magnaflow cats are stayin, can always change it up later. Sucks being deloyed while this is happening.
#15
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"Needing backpressure" is an absolute bullshit myth - ANY backpressure is a bad thing. Anyone who argues for backpressure doesn't understand exhaust scavenging. Also, going from a 3" pipe to a 4" pipe will actually decrease exhaust velocity, which can hurt power. Not saying it does for that specific setup, but it can.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
As far as true duals vs a single-pipe setup...well, sound. Most single-pipe systems on LS1 cars make them sound like boats, and cutouts just sound like ***. I also personally think no tips looks better on the back of a Trans Am, although unless they don't have the rear valence, Camaros look weird without them.
Back pressure in our cars is a bad thing. Our engines make more power by flowing more air. By creating pressure in the exhaust system you lessen the air that enters the combustion chamber and in effect make less power.
Some of you need to go back and read the "I wanna go fast" sticky. True duals are high flowing which is good, a Y-pipe system (a good one) creates scavenging which doesn't create back pressure, it sucks the air out, and a stepped up system (3" to 4") can increases velocity which helps with scavenging.
Back pressure is needed in 2-stroke engines. The pressure is used to open and close the valves. We have cams for that. That is also why you hear this back pressure argument from ricers and those who've come over from the ricer community. Back Pressure is also needed in forced injection like turbos. That pressure however is in the intake manifold, not the exhaust.
#16
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Im kinda wondering about the whole clearence thing myself, ive got a tunnel mount TA and know thats gonna be a problem for this guy, i know the bolt-on kits wont work. Ive seen the TSP sysems, and they seem to have the worst clearence of them all, had a few friends with em. The guy wants to keep my cats, told the wife it needs em, even if they dont function, so i figured id run no mufflers if the magnaflow cats are stayin, can always change it up later. Sucks being deloyed while this is happening.
Other than that the only issue is the two bullet mufflers. Right now they hang a bit low because I did my install on a post lift instead of a roll on, so my suspension was unloaded and I couldn't tuck them up nicely. Once I have the free time however I can roll the rear of the car onto a set of ramps and fix that issue and everything will tuck nicely.
The TA is the only issue and that can be solved by going back to a tail mounted with better yet, a TA relocation tranny cross member.
#17
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I think people need to look at where they want their power -- across the RPM band is a great ideal, but perhaps true duals changes that. For me, I really like the low to mid-band power the most -- that torque if fun!
Racers will likely car more about upper-RPM bands... It would be great if more people post dyno charts of both before and after major exhaust changes -- it will benefit us all, and we will have numbers to learn from instead of a lot of opinions...
Racers will likely car more about upper-RPM bands... It would be great if more people post dyno charts of both before and after major exhaust changes -- it will benefit us all, and we will have numbers to learn from instead of a lot of opinions...
#18
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Thank you.
Back pressure in our cars is a bad thing. Our engines make more power by flowing more air. By creating pressure in the exhaust system you lessen the air that enters the combustion chamber and in effect make less power.
Some of you need to go back and read the "I wanna go fast" sticky. True duals are high flowing which is good, a Y-pipe system (a good one) creates scavenging which doesn't create back pressure, it sucks the air out, and a stepped up system (3" to 4") can increases velocity which helps with scavenging.
Back pressure is needed in 2-stroke engines. The pressure is used to open and close the valves. We have cams for that. That is also why you hear this back pressure argument from ricers and those who've come over from the ricer community. Back Pressure is also needed in forced injection like turbos. That pressure however is in the intake manifold, not the exhaust.
Back pressure in our cars is a bad thing. Our engines make more power by flowing more air. By creating pressure in the exhaust system you lessen the air that enters the combustion chamber and in effect make less power.
Some of you need to go back and read the "I wanna go fast" sticky. True duals are high flowing which is good, a Y-pipe system (a good one) creates scavenging which doesn't create back pressure, it sucks the air out, and a stepped up system (3" to 4") can increases velocity which helps with scavenging.
Back pressure is needed in 2-stroke engines. The pressure is used to open and close the valves. We have cams for that. That is also why you hear this back pressure argument from ricers and those who've come over from the ricer community. Back Pressure is also needed in forced injection like turbos. That pressure however is in the intake manifold, not the exhaust.
#20
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A set of headers with a larger set of primaries and collectors than stock manifolds (ignoring the rest of the exhaust for this example) is going to scavenge slightly less at lower rpms, since there's lower exhaust velocity due to larger pipe size and lower flow, but will flow and scavenge much better at higher rpm bands. That's why you see people switching between 1 3/4", 1 7/8", 2", etc primaries - it changes the most efficient point of the engine's powerband.