Triumphrat

Timan · 03-19-2007

I have '99 speed triple with standard mount Yoshimura. I have checked into high mount and low mount shorty slip-ons. Prices are a little bit out of my range--read too much for a 2" hole through a cone. Have any of you riders tried one of the sewer pipe exhaust tips used by the import car kids? I'm thinking of removing slip-on and mid pipe and install one of these obnoxious end pieces. Do these engines require back pressure for max power? Thanks for input.

ThePope · 03-19-2007

You might wanna PM oldsquid or check out Click on me this website. There are a lot of good mod tips there.

BUCKET · 03-19-2007

Need back pressure,eat some cheese,lots of it. :-D Yes any motorcycle needs a certain amount of back pressure. :hammer:

birdman · 03-20-2007

premier · 03-20-2007

I remember Devious saying that back pressure is NEVER good on a 4 stroke engine. Not for max power nor torque.

BUCKET · 03-20-2007

Quote:

On 2007-03-20 04:10, premier wrote:
I remember Devious saying that back pressure is NEVER good on a 4 stroke engine. Not for max power nor torque.

I've always been told that you need a certain amount of back pressure for torque,and i proved that with the exhausts i made.Tried it without back pressure,reduced torque.Kept adding back pressure,got the torque i needed. :hammer:

Buster · 03-20-2007

As far as my knowledge of physics go:

Backpressure itself will not help BUT if reflection of pressure wave comes back to exhoustvalve whith low pressure when it opens up, gas will be released easier, this will result in better torque. So in theory the best is to have no backpressure but make advantage of high/low pressurewaves.. That is why some bikes have a connection between headers from different cylinders...
As for the intake it's the other way around, an airbox, turbo or other charger will generate more pressure, so when inletvalve opens, more air in cylinder.

I might be wrong though :-D

Buster · 03-20-2007

We need DEVI back here !!

gr8shandini · 03-20-2007

Actually, you need a bit of a restriction from a header in order to increase exhaust velocity, not backpressure. And, if you're creative, you can take advantage of power pulses to create a negative pressure at the exhaust port like Buster said.

These guys do a pretty good job of explaining the whole deal:

Backpressure and You!

DirtMcGirt · 03-20-2007

i'm broke so i just did this...audible appreciation only :hammer:

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