does this do harm??

[TsiTalon90]

well rite now i'm running just the down pipe will this hurt it just driving for a month till i get exhaust. it seems to run ALOT better this way tho.

 

[Lunch_Box]

The only thing it might hurt is your ears. But other than that your car will pull harder. Some people when they go to the track they often remove the exhaust from the down pipe back for a few extra HP.

 

[peregrine]

its fine. just make sure you dont get a ticket for noise. and your neighbors will hate you too.

 

[TsiTalon90]

k thanks dsmrs just didnt want to reck something.

 

[2GStreeT]

Ok please coreect me if im wrong i drove around 170 Ft/lbs trq car for a year and a half so im damn new to FI. With that free of an Exhaust doesnt that just kill Low end Torqure, or with a turbo setup backpressure isnt that inportant as a N/A car

 

[97gsspyder]

i warn you if your doing this be careful and try not to sit in one spot for long periods of time, because the carbon monoixide and other chemicals from you exhaust will get into your cabin and you could die from that shit, just dont sit and idle too much

-Jeff

 

[peregrine]

Originally posted by 2GStreeT
Ok please coreect me if im wrong i drove around 170 Ft/lbs trq car for a year and a half so im damn new to FI. With that free of an Exhaust doesnt that just kill Low end Torqure, or with a turbo setup backpressure isnt that inportant as a N/A car

turbo cars dont like a lot of backpressure.

 

[2GStreeT]

Would you please explain why that is?

 

[peregrine]

the less backpresure there is, the easier it is for the turbo to spool. im sure the wisemen could give you a better explanation. my friend bacardi prevents me from explaining this right now do a search or buy corky bells book. it has some amazing shit in it. good luck.

 

[91 NT Eclipse]

The turbo itself provides enough backpressure for torque so the freest flowing exhaust there is is the best choice. In his case, none at all.

 

[Stock Josh]

Wrong. No exhaust is not the best case scenario. And bigger is not always better. You can go too big and compromise some low end torque, EVEN ON A TURBO CAR. You will see better low end response and more low end torque with smaller exhaust ( to a point ). Now, running no cat back wont hurt anything, but dropping the downpipe will. You will lose low and mid range torque.

Stock Josh

 

[DSMeclipse4G63]

ok now that we all know that turbo cars require and like less back pressure we can get away from that. All cars need sometype of backpressure so It is bad for you too run that setup. The only type of cars that do run this exhaust setup are race cars and temperary use. Valve damage is a concern, but you probly will run better at the track...but in the long run no exhaust is bad for your car.

 

[igs]

Originally posted by DSMeclipse4G63
All cars need sometype of backpressure so It is bad for you too run that setup.

Oh please not more backpressure talk. The less backpressure the better, no matter what kind of car you have.

The only type of cars that do run this exhaust setup are race cars

No shit. Wonder why? Because the less backpressure the better, period. The best exhaust is an open exhaust (race car exhaust).

 

[out there]

uhh... count me in for the anti-back-pressure group. with a turbo, back pressure is stupid, the turbo provides all the engine needs. the only exhaust that is necessary is... well, maybe a short pipe to get the gas out of the engine bay. otherwise, bigger/not-there is better

 

[DSMeclipse4G63]

Originally posted by igs


Oh please not more backpressure talk. The less backpressure the better, no matter what kind of car you have.

No shit. Wonder why? Because the less backpressure the better, period. The best exhaust is an open exhaust (race car exhaust).

wrong!!! A non turbo car with a 10 inch diameter or open exhaust...yes will run great at the track. But the street please it will #### up real soon, without backpressure, oh yeah which is needed for all cars...even if you have a turbo!!! Yes less back pressure is what you want but zero is BAD!!!

They would create backpressure in cars if it wasnt needed. Me, I have been working for ford and I know manufactures arent going to waste a penny in need be. so if back pressure isnt needed why do they create it and waste their pennies on that smart guy. Dont come at me again.

 

[igs]

Originally posted by DSMeclipse4G63

wrong!!! A non turbo car with a 10 inch diameter or open exhaust...yes will run great at the track. But the street please it will #### up real soon, without backpressure, oh yeah which is needed for all cars...even if you have a turbo!!! Yes less back pressure is what you want but zero is BAD!!!

Huh? You're contradicting yourself over and over.

They would create backpressure in cars if it wasnt needed. Me, I have been working for ford and I know manufactures arent going to waste a penny in need be. so if back pressure isnt needed why do they create it and waste their pennies on that smart guy. Dont come at me again.

Car manufacturers have to reduce exhaust sound. Hence the existence of a muffler. And smaller pipes are cheaper, more practical and quieter than large pipes. How old are you? I'm sick of trying to argue with kids like you. If you have any more questions go ask your daddy because I'm done.

 

[igs]

Originally posted by DSMeclipse4G63
The only type of cars that do run this exhaust setup are race cars

Figure out your own damn statements and you'll understand why open exhaust is best.

 

[DSMeclipse4G63]

oh Im sorry to waste your time...Im not a kid Im 20 and I know what Iam talking about too. you said no backpressure is the best and your wrong. you need a little backpressure on all cars(more on n/a cars). If you want to run zero backpressure thats up to you...just dont come crying when your car f##ks up. Oh yeah and the dont come at me agian meant dont try and fight me when Im trying to help someone. How old are you dont lie? Otherwise get a life...there are better things to do than fight people.

 

[igs]

Originally posted by DSMeclipse4G63
Im not a kid Im 20

Yea you are, you're still a schoolboy (or did u drop out?). Shouldn't you be studying? .

 

[LaserRST]

Wow this thread has gone outa hand.... well both yall are actually right. An open exhaust will improve flow (duh), but too open or non existant exhaust is not good. The exhaust is much like the intake as it reacts to a rarefraction wave similarly. For those who dont know about the rarefraction wave its the wave that returns to the valves as they open and close. This pulse needs to be tuned to performance. If you have a car that only flow a few hundred cfm, a large exhaust will not do you any good. It will actually do you harm cause the pulse wont travel fast enough down the exhaust and actually create a restriction allowing more spent gasses to re enter the combustion chamber and reducing power. If you are producing 1000-5000hp like top feulers, it dont matter so much about exhaust size cuz you just want flow, spent feul out of the engine. If you have seen any of those top feuler cars, as they idle feul actually flys out of the exhaust and burns. If you are a smart tuner you will tune your car accordingly so that all the parts work together. Dont put a 3 in exhaust on a geo metro, and dont put a 2in exhaust on a mack truck. To answer the initial question about harm to internals on half an exhaust, not much to worry about that far down the exhaust. i would worry about carbonmonoxide entering the cabin though, and heating up right under your seat.

 

[DSMeclipse4G63]

haha your funny your the school boy. You cant even reveal your age...let me guess your a minor and mommy wont let you. Good night Im tired of fighting with little kids like you over stupid stuff. Go play with your toys and come back when you can drive.....that is if mommy lets you.

 

[peregrine]

why dont both of you shut the f*ck up and quit whoring up this thread with your pointless drivel.

 

[Omega]

The exhaust is mainly used to quiet down the car. It does do several other important things though... moreso in n/a engines.

N/A:

Exhaust gases exit the engine in pulses. These pulse waves can be tuned by the pipes. The correct length and diameter pipe can be VERY important. Idealy you want the exhaust to scavenge. That means that the flow from one cylinder can acually suck the exhaust from another. This is how some n/a engines are able to obtain OVER 100% efficiency.

Turbocharged:

Backpressure is evil. To maintain the proper exaust gas velocity, the tube dia should be ~10% larger than the turbo outlet dia. Words of wisdom by Corky Bell. If you do not know who he is, buy a honda. Seriously.

 

[larryd]

I can only give the opinion on it from experience, when I ran the GST with only the downpipe it felt like dog crap. Seriously the car felt incredibly sluggish, the turbo was taking 10 years to spool and the torque was way down. Once I was moving the car was fine though.