Resonator?

[KenOhki2112]

Originally Posted by logik23

I don't know where those things are, but everyone is always saying in this forum that you can get more power out of a 3" then a 2.5" and the tradeoff it might not be legal in terms of noise and emissions. But wtv, get a 2.5 if u want, I realy dont care. lol

They are correct, you WILL get more power, but you will also lose LOTS of low end power, you lose so much that it doesn't make up for the gain in HP. go 2.5 MAX, at 2.5 you're losing a considerible amount of torque, and it's going to be quite loud. For what this guys asking, 2.25" with a resonator (after if it's too loud without) and a nice open muffler will give you a nice gain, sacrifice little torque, and will set off only the most sensitive car alarms.

[Noc]

eh, im just wondering you know, dont wanna put 3 inch only to find out its making me lose hp cause its to big.

[KenOhki2112]

Originally Posted by Noc

eh, im just wondering you know, dont wanna put 3 inch only to find out its making me lose hp cause its to big.

You won't lose horse power, you will gain some peak horsepower with a 3" over a 2.5"

You will lose Torque, and LOTS of it, which will make your car accelerate really slowly when the engine is under say 3500rpms, after 3500 your peak horse power will start to pull its weight, just not enough to make up for how long it took you to get up to 3500rpms ^^.

In a quarter mile race, I would bet on the 240 with the 2 1/4" pipe over the one with the 3" pipe, all other factors being the same.

[Noc]

cool, well thanks for your help guys.

[monooxide]

Reading older posts... and you said that you would lose LOTS of LOW-END POWER? If Low-End to you is 3500and lower then in the drag you should be fine? I mean you only use LOW-END power in first gear right? in 2nd im at 3250 and in 3rd its at like 4200 and then from there up so you dont use that much LOW-END power? and you talk about the LOSS of torque being so bad that it takes forever to get to through the low end? im guessing your talking like 3-4 seconds?

[KenOhki2112]

the lost torque would be most noticable in the 0-3500 rpm range, and it will hurt you on the drag strip more than the extra 1-2 peak HP you gain around 5500 rpms.

On the street you will notice the lost torque much more.

Again, all things being equal, 2.5" vs 3" on the stock 240, I would bet money on the one with 2.5".

First gear is probably the most important gear on the strip anyway ^^

As you increase the diameter you gain less and less horse power, but the loss of torque due to less backpressure remains fairly constant, with that in mind, cars can benefit from making the pipe slightly larger, where the gain in HP out weighs the loss of torque, This is why very few people drive around the street with 12" piping, you don't stand to gain very much horsepower after 3".