Coolwazabi Posted April 28, 2008 Report Share Posted April 28, 2008 Lets say I had no exhaust and just did a straight pipes. Would it decrease my gas mileage and power since there is no backpressure oppose to a little ? Quote Link to comment Share on other sites More sharing options...
qu1cks1lver56 Posted April 28, 2008 Report Share Posted April 28, 2008 heres what you need to do if you wanna run straight pipes. put your pipe on the headers, and take some soap stone and draw a line from the collectors on down the length of the pipe. then crank it up and run it till its up to temperature. it will burn the soapstone off until a certain point. where it stops is where you cut the pipe off, then thats the length of pipe that your motor will run the best on and have the correct backpressure. we used to do this on racecars when we wanted to run an exhaust system instead of open headers. hope this will help, and the gas mileage, im not too sure whether it will help or hurt it, but this way is the best way to get the most power gains from your exhaust. Quote First Gen Xterra: Always changing DNX 690HD RF 360.3RF T3002RF T4004RF T10001bdSilver Flute 6.5"s Tang Band 1" TweetersSundown X18 in 7cubes net tuned to 32hz Trust me .25 Blows your Load. Link to comment Share on other sites More sharing options...
Coolwazabi Posted April 29, 2008 Author Report Share Posted April 29, 2008 heres what you need to do if you wanna run straight pipes.put your pipe on the headers, and take some soap stone and draw a line from the collectors on down the length of the pipe. then crank it up and run it till its up to temperature. it will burn the soapstone off until a certain point. where it stops is where you cut the pipe off, then thats the length of pipe that your motor will run the best on and have the correct backpressure. we used to do this on racecars when we wanted to run an exhaust system instead of open headers. hope this will help, and the gas mileage, im not too sure whether it will help or hurt it, but this way is the best way to get the most power gains from your exhaust. well.. i have stock cat and flowmaster 40 exhaust.. can i still do that soapstone thing ? just watch where it stops burning ? Quote Link to comment Share on other sites More sharing options...
BackYardSoundZ Posted April 29, 2008 Report Share Posted April 29, 2008 What motor you got? Quote Link to comment Share on other sites More sharing options...
Coolwazabi Posted April 29, 2008 Author Report Share Posted April 29, 2008 What motor you got? 94' cadillac 4.9L "not the northstar version" i think its like 200hp @ 3600rpm Quote Link to comment Share on other sites More sharing options...
BackYardSoundZ Posted April 29, 2008 Report Share Posted April 29, 2008 94' cadillac 4.9L "not the northstar version"i think its like 200hp @ 3600rpm See the thing is your only gonna get what your motors made of, like seeing these kids putting flows on a grand am shit not knowing its the motor that makes the sound, so with your car you will probaly end up getting shittier sound the longer you make the pipe because of all the un-burned gas and echoing throughout, so if you can find where your closest hanger is to your engine and work your way back from there. Quote Link to comment Share on other sites More sharing options...
Coolwazabi Posted April 29, 2008 Author Report Share Posted April 29, 2008 See the thing is your only gonna get what your motors made of, like seeing these kids putting flows on a grand am shit not knowing its the motor that makes the sound, so with your car you will probaly end up getting shittier sound the longer you make the pipe because of all the un-burned gas and echoing throughout, so if you can find where your closest hanger is to your engine and work your way back from there. yeah.. its making an annoying humming noise... rather than that popping noise i'm actually looking for... so ur saying shorten the pipe to the first hanger and add the muffler there ? Quote Link to comment Share on other sites More sharing options...
BackYardSoundZ Posted April 29, 2008 Report Share Posted April 29, 2008 yeah.. its making an annoying humming noise... rather than that popping noise i'm actually looking for...so ur saying shorten the pipe to the first hanger and add the muffler there ? Thats what i would do if your looking to go loud, just put the muffler on the closest hanger Quote Link to comment Share on other sites More sharing options...
PaulO2288 Posted April 30, 2008 Report Share Posted April 30, 2008 Backpressure helps the engine make more power, tourqe and horsepower increase with backpressure. When you loose or take off you muffler and run a straight pipe with no sort of device to make back pressure you loose power and gas mileage! It was the stupidest move ive ever made putting a glasspack on my Jeep. Lost 4 miles to the gallon driveing the exact same way! Quote Link to comment Share on other sites More sharing options...
talentfinder36 Posted April 30, 2008 Report Share Posted April 30, 2008 Backpressure is necessary for naturally aspirated cars to run efficiently. Running straight pipes will take that away and you will lose alot of low end power. As far as gas mileage you show see a small increase in your mpgs as you are taking way restrictions on the exhaust. Quote Mark 99 Eclipse Spyder Link to comment Share on other sites More sharing options...
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