Urban_LegendGS-R

i'm running n/a and have 2.5 buddy club header back exhaust, dc 4-2-1 headers from my gsr motor. how can i get more back pressure? what can i get to make more pressure? other than just turbo it...

yoffer

Your not running a resonator or cat?

Urban_LegendGS-R

i have a catalytic converter, but no resonators..

Plo8618

you should put a muffler and a res. on it

ddd4114

You could stick a potato in the tailpipe. That should raise the back pressure a good amount.

Seriously though, why do you want to increase back pressure?

Plo8618

increasing the back pressure will give you some power back. its just like driving with open headers your car is more slow. but with some back pressure you can gain some of the lost power.

ddd4114

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Plo8618 &raquo;</TD></TR><TR><TD CLASS="quote">increasing the back pressure will give you some power back. its just like driving with open headers your car is more slow. but with some back pressure you can gain some of the lost power.</TD></TR></TABLE>
Increasing back pressure will decrease power. The reason your car is slower when running an open header is not due to a lack of backpressure. It's because exhaust gas velocity cannot be maintained and scavenging is worsened.

BryanM.

iTrader: (1)

You're talkin low rpm power right? I highly doubt that applies to high rpm power.

ddd4114

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mcvtec &raquo;</TD></TR><TR><TD CLASS="quote">You're talkin low rpm power right? I highly doubt that applies to high rpm power.</TD></TR></TABLE>
Me or him?

bigsyke

its all about velocity.

BryanM.

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ddd4114 &raquo;</TD></TR><TR><TD CLASS="quote">
Me or him?</TD></TR></TABLE>

Plo8618, sorry should have quoted.

I agree with what you said ddd4114.

From what I understand, back pressure is important for low rpm operation and hinders high rpm power (more or less).

ddd4114

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mcvtec &raquo;</TD></TR><TR><TD CLASS="quote">From what I understand, back pressure is important for low rpm operation and hinders high rpm power (more or less).
</TD></TR></TABLE>
Like bigsyke said, it's all about maximizing exhaust gas velocity. Increasing restriction (and thus increasing back pressure) will decrease torque output throughout the entire powerband. You can "adjust" your powerband by changing exhaust piping diameters, header designs, etc. to bias for more low end torque or more peak power up top.

Adjusting (or minimizing) backpressure should not be the goal when designing an exhaust system. It should be maximizing gas velocity and scavenging.

BryanM.

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ddd4114 &raquo;</TD></TR><TR><TD CLASS="quote">
Like bigsyke said, it's all about maximizing exhaust gas velocity. Increasing restriction (and thus increasing back pressure) will decrease torque output throughout the entire powerband. You can "adjust" your powerband by changing exhaust piping diameters, header designs, etc. to bias for more low end torque or more peak power up top.

Adjusting (or minimizing) backpressure should not be the goal when designing an exhaust system. It should be maximizing gas velocity and scavenging.</TD></TR></TABLE>

Ahh, I see