side exhaust..

[new_world_disorder]

i know this mite sound silly, but is a valver to short for a side exit exhaust ( just infront of the pasanger-side rear wheel )

cheers

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[cat171]

bb's turbo'd valver runs one, I believe some on here do too.

 

[Sy]

Rich M's car has side exit exhausts...................... I seem to remember. Looks ok, something different for a change.

 

[Dan@SJM]

i had one.

lost too much power though.

 

[new_world_disorder]

hmm, the power loss is my only concern cos i have to get a silly back box. unless i do a str8 through. which is noisy as furk. i duno. hmmmmm so much thinking needid

 

[Andyrg@ ClioTurbo]

just do it man, look class, did think one for the scooby but i decided to spend another £1000 on the turbo

 

[Englebert]

In principle the shorter the exhaust the more power you should get.

 

[C.slicker]

In principle the shorter the exhaust the more power you should get.

Yeah I was confused as to how it would lose power.

Is it something to do with back pressure or something though?

Sam

 

[Dan@SJM]

aye, well i gained very slightly top end, but the loss of torque was phenomenal.

it needs the back pressure. im now running a straight thru centre section, unsilenced decat, and just a scorpion b/b and shes a flier now.

 

[Martin]

In principle the shorter the exhaust the more power you should get.

maybe on turbo cars that don't need back pressure....

 

[new_world_disorder]

ill have a chat to charlie down pro-speed today. see what he can do. if i have a back box for a side exhaust it has to have the inlet and outlet on the same end. and these boxes generally arent to great.

 

[GordonD]

Its the same in both the intake and exhaust systems.

A b-i-g pipe gives you the maximum horse power by restricting flow the least. But a big pipe means the gas is flowing so slowly at lower revs that when the pressure pulses that occur as the valves open and close travel out the pipes you get flow reversals. That reduces torque at lower revs. Its not back pressure per se that you want, its to maintain a minimum speed of flow. You have to use a pipe size that gives you a compromise between losing torque because the pipe is too big, versus losing power because the pipe is too small. There's no "right" size exhause pipe, there's the size you choose depending on what you want to optimise for, torque or horsepower.

What Renault did on the intake side in the Sport so it didn't have to choose one of either power or torque is have two pipes feeding into the air cleaner, one with the acoustic valve on it that's opened at full throttle at high revs to get maximum power, and closed at low speeds and low throttle openings so you get maximum torque and fuel economy and don't get a jerky throttle action. And most of you silly buggers then remove it because you think you know better than Renault's engineers.