straight pipe?

[kjewer1]

Reducing backpressure ALWAYS increases HP. The highest HP DSMs dont use any exhaust. A local guy dropped his catback and went from ~132 to ~135 mph in the quarter (thats nearly 30 whp).

Now, loss of lowend torque is another story, and not an issue on turbo cars as the originator of this thread has.

Edit> Look at exhaust scavenging from headers. If timed properly, the exhaust pulse from one cylinder can put a negative pressure at the valve of the next cylinder to open the exhaust valve. That will make more power than just running open heads. Now, those headers will provide more backpressure than an open head would have. But its not the backpressure than made the power increase, its the increase in velocity at the scavenged port to the the low pressure area behind the scavenging exhaust pulse. 7000 HP dragsters run a 1 or 2 foot pipe off the heads. With forced induction scavenging is far less effective. Thats the lowest they could ever dream off getting backpressure (they have to run thos short pipes so the exhaust doesnt set the car on fire, they simply divert the exhaust away). You wont find any measurable backpressure on those 7000 hp motors...

[EclipseRST]

well i wasnt talking about a turboed car... i was talking about a n/t, of course you dont want a small exhaust on a turbo... all that will do is slow down the turbine and reduce the flow.

EDIT: oh most definatly not... i have also heard that they have to run those pipes so when they shut the motor down, cool air wont enter the exhaust ports and crack the valves since the motor gets so hot then the air would enter and cool the valves so quickly... dont quote me on it, its just what i have heard from different racers

[91_TSI_TALON]

wow i learned alot by reading that post

[kjewer1]

Even on a NT car, no exhaust will still make more power. You will lose low end torque, but gain it on the hgih end, increasing peak HP. Now, wether that change is the right thing to do depends on the application. Many times the low end torque is not worth losing, and thats what I'm assuming you're refering to.

[91_TSI_TALON]

yes thats what i was talking about.

[EclipseRST]

same here... plus with a n/t eclipse that only has an intake and exhaust, i dont think your worried about gaining too much high end hp! if you want high end hp... get a turbo

[riff22]

so i have a TSI, what u guys are sayin is that no back pressure is better for a turbo car? correct? oh and im in OHIO i dont think there is any emmisons here.

[EclipseRST]

yes... your best bet would be to get a 3" turbo back exhaust if you plan to do bigger and better mods to the motor. if you dont plan to go that big get 2.5" just cause its cheaper and will work for what you are planning to do. but if you are planning to make your car run fast, motor work, bigger turbo setup, stuff like that, i would get 3" right away just so you dont waste money and have to upgrade twice

[real_madridcf]

Originally Posted by EclipseRST

same here... plus with a n/t eclipse that only has an intake and exhaust, i dont think your worried about gaining too much high end hp! if you want high end hp... get a turbo

so jake, are you saying that my n/t is not fast ?

[EclipseRST]

YES!!!

sad to say they are slow cars!

Off topic: oh and what style MSR rims do you have? i have 190's on my GST and so far really like them, black rim with a machined polished face!

[real_madridcf]

lol, i know they are slow. When i drive the gs-t, i feel like the gs is a joke. Anyways i have MSR rims, i think they are style 103. I like them, they are kinda offset i wish they were more . Here is a link for a pic of it.

http://www.discountedwheelwarehouse....ShowLarge=True

[riff22]

thanks

[kjewer1]

Another note... Just because your area doesnt have emissions doesnt mean that cats arent required. Having a cat is a Federal law, not state or local. So that covers all of the US. The thing is there are no federal agents driving around looking for people without cats, and the states that dont have emissions are unlikely or unable to enforce the federal law, so you typically get away with it. But it certainly is still illegal.

[imtheoneandonlyD]

yeah no emissions is a plus. mn rocks, lol

[AB24]

hey im looking to get more power from my engine is striat pipe or pipe with backpressure going to give me more power?