jlashley2001ss

iTrader: (5)

what kinda HP gains will i see switching to a true dual exhaust? I know its not much but just kinda curious. Sig below shows current setup and im going to keep my cats/H-pipe/spiral flows over the axle. Like i said im just kinda curious. TIA guys

orangeapeel

iTrader: (18)

wait....so you have an H-pipe already? How is that not true duals?

jlashley2001ss

iTrader: (5)

no im getting a true duals system with a H-pipe. I have a TSP Y-pipe and hooker catback and QTEC cutout. I might wanna add that the true dual system will be crush bends

orangeapeel

iTrader: (18)

It says keep cats/h-pipe/spirals. I noticed you have the Y though...

orangeapeel

iTrader: (18)

Crush bend! f-that. You might as well put a john deer stock exhaust on there.

jlashley2001ss

iTrader: (5)

yeah clear it up all i meant was that im keeping my cats. thas all

GT Griller

iTrader: (8)

Yea kinda wondering if its worth going to true dual after having a cut out performance wise not just for sound.

lsx24

iTrader: (45)

True duals are going to give you more midrange tq, because of the scavenging effect of the xpipe. They usually don't give much if any hp over a good ypipe setup because up top those flow pretty good. It's going to be the midrange where you're really see the benefit.

jlashley2001ss

iTrader: (5)

even with crush bends?

lsx24

iTrader: (45)

Yes, even with crush bends. You are not going to take a huge hp hit until you are making some serious rwhp, even then the hit will be minimal. Just make sure you have a good volumetric xpipe, an hpipe is not going to scavenge nearly as well, if at all.

BitViper

iTrader: (63)

Ok....technical question from some one who knows nothing...how is it possiable to have an increase in torque..and not have some increase in hp

lsx24

iTrader: (45)

Good question, I don't know the exact details, but let me see if I can give an accurate guestimate but I know one things for sure: it's possible because of the effect of scavenging.

The speed of the exhaust gases vary as they are higher rpm. At lower RPM there is a scavenging effect of the xpipe, just like long tubes, that increases the velocity more than stock, because of the pulses of the exhaust coming from the engine. As the speed gets up there to upper RPMs, there is less scavenging effect and consequently the pulses are so bunched together they don't scavenge as much, hence the same hp as with a good flowing ypipe.

Technically you can tune an exhaust to scavenge in a certain way. That's why equal length primaries on headers are so important, because they allow the engine more scavenging. So tuning True Duals to place the xpipe in the best location possible (as close to the headers as possible) will result in more efficient scavenging, at midrange rpms, where the effect of the pulses are greatest.