Interesting smells

[Chiquae07]

i am having interesting smells from my cars exhaust. im planning on redoing it. does anyone know if the high-flow cataylistic converters work? it will go with 2.5 in piping cat back.....anyone know? thanks

o and it snowed today, a car's brakes locked i guess and plowed into a city bus....lol

[CBFryman]

If you jsut put a new cat back on there is often some smells sorta like rubber burning or gasket material burning. Did with mine and did with all 3 of my friends cars that i helped put the exaust on.

oh sucks about hitting the bus.

[Chiquae07]

nope, has stock exhaust on it currently, is a project for when the snow clears...

i said a car hit it, not me, so i was laughing at it. it was at a red light and he couldn't stop....idiots..

[rice(er)]

are you sure you didn't.........F.A.R.T.?.?.? eWwWwWWwwwWWwWwWwW.....jk it could be the muffler in the back because when i still had my stock on and went WOT i could smell something like you're describing too, and after i took it off the smell was gone, or i should say.....i havn't noticed it, yet.....good luck mang whatever you decide to do, ask jayson with the cavalier about 2.5" piping, he yelled at me for having something similiar like that done to my car 'cry 'cry *tries to find tears icon but cant find it*

[-Jayson-]

the most common bad smell out of an exhaust is a rotten egg smell, and thats usually caused by a bad catlytic converter. Its the Sulfer Dioxide i believe.

[Chiquae07]

is there any thing bad with putting 2.5in piping on my 4 cyclinder? i don't want the rice sound, more of a deep one like hks....but i think id have to get a universal one from them or blitz....

[xXxRocker5150]

^2.5 would be perfect if you're n/a... if your cat is going, just replace it with a high flow cat or something... they have pretty nice warranties on em'

[TatII]

you have a 2.0 sentra i assume, if your not planning on going boost, then a 2 and a quarter would be perfect. however i've read articules with dyno results that despite the rule, if you go up a quarter size up from the recommended size, you would gain more peak hp.

also high flow cats do work. if they didn't my car wouldn't have passed inspections. and a highflow cat wouldn't do much on a n/a car but if you have a to change it anyway, then might as well put a highflow one since the OEM ones are $800. but the factory is required to warrantee your CAT if it fails before 75K miles or around that ball park. i suggest you dig it up to find out what the exactly mileage is.

[CBFryman]

Peak power is less important than what is gained below it

[Chiquae07]

yes tat, its a B15 high port sr20de 2.0L

the car has like 124k on it..im not counting on it. what brands are good for low to mid tq muffler wise? this is going to be done all in the summer with hot-shot header, high flow cat, with muffler shop straight back system with muffler...i think i might have to add cams to it since its advised to do those with headers(one question)

im also thinking of gettin a safc(i think its called) and raise the rev lmiter on it if it would make a difference on an auto to shift at different points(idk thats y im asking)....

[xXxRocker5150]

^as long as you don't get a muffler with like a 3 or 4 inch tip, than you won't loose backpressure, so your low end shouldn't change

[-Jayson-]

modern day 4 clyinder engines work off velocity. With a small pipe while the engine is idleing the cars exhaust has a constant stream of velocity. Meaning the exhaust gases have filled the exhaust system, and are moving at a constant rate out. When you get an exhaust system that is to big, what happens is the air moves in burps. It doesnt fill the exhaust pipe all the way, so the exhaust gas gets pushed into the pipe, then it doesnt have enough pressure to get out of the pipe, so it sits there, then another wave of exhaust gas comes and pushes it a littler further and so forth untill its completly out.

The problem is so many people try to apply the fluid dynamics of a V8 to a 4 banger. With a v8 you have the extra cylinders that allow for you to put a large exhaust pipe on it and not lose low end power. They fire so quickly and so much more exhuast that they dont have a problem keeping the exhaust gases moving. Not to mention they are already very torquey.

Putting on an exhaust will give you a little higher peak HP, but your gonna lose a noticeable amount of lowend to gain it. Your going to lose lowend torque, and low end torque is what makes a car fast.

Torque wins races, HP is for braging rights.

Also i have never heard a 4 cylinder with a good sounding exhaust that wasnt raspy. THis does not include exotics and sports cars. With the exhaust it is gonna sound ricey, unless you put a big ass resonator on it.

[Chiquae07]

i dont think so. i've heard some pretty good exhausts that aren't ricey at all from my friends 5 dollar ones from ebay. they have turbo eclipses/lazers, but maybe its because they are turbo....some n/a cars ive heard aren't ricey..i dont think mine will be, all i know is that i dont want the beehive sound, just a little lower sound and ill be pretty happy. i honestly bearly know the difference between the two, a ricey one is always loud, the others are much quieter unless revving higher than 3500rpms... i think everyone i know with the exception of one or two people have the exhaust from ebay with straight piping from the muffler shop, so if anyone has sound clips i think that would be a good idea to help me out here.

[TatII]

remember jayson he does have a SR20DE in his car. so its goin to sound atleast decent. a good brand of high flow cats would be from magnaflow and if you got the dough you can get a random technology one.

[CBFryman]

I thought HP won races, hp sold cars and torque was what the muscle cars used to have something to brag about "i may only have 200hp but i have 500 lb-ft of torque"