Exhaust Question

[nissanfanatic]

Originally Posted by zeroneonzn

eh local shop did mine except i have no cat instead i have a cat bypass pipe that make my car back fire sometimes when i shift gears, all connected to a n1 muffler and it works for me gave me tons of power.

every car backfires. Its just that now you don't have the amount of sound suppression material you had before.

Originally Posted by sf_carfreak

I agree w/nissanfanatic and logik23 that there is much science to exhasts. My question is whether trying to use one exhaust for both KA and SR is a good idea performance wise. They are 2 different engines (na vs turbo) so I'd think that trying to use one muffler wouldn't get you the best performance.
I'm interested too b/c I have the same dilema as logik23 in that I have KA now, but don't know what I want to do engine wise (sr,rb,ca,kat) in the future.

I bought an Apexi and it works pretty well on the KA. Get something cheap if you are not sure or wait until you finish the engine setup.

[zeroneonzn]

idk my friend had a cat in his car with a sr it didnt bak fire really un till he put in the same thing i have now it gose bang bang same with my friend and his ka he had a cat nothing put what i have now he has pop pop bang

[saikou240]

^^^ haha, needs to go back to nursery school.

vroom vroom beep beep goes the car. c'mon man you can articulate and explain better than that.

[nissanfanatic]

Backfires occur because unburnt fuel remains in the combustion chaimber due the fact that the throttle body is closed. This causes a lack of air. When the combustion chaimber draws enough air past the throttle blade, it causes a large explosion because of the larger than normal amount of fuel. The cat only took away some of the sound suppression and maybe made for a little better flow. Your car back fired before, you just couldn't hear it.

[zdude]

my car has audible back fires right now, but thats cuz there are gaps at every joint, such as from the piping to the cat. also, i dont really have a muffler right now, so it backfires like a son of a bitch sometimes, freaks me out

[logik23]

I think all big name exhaust for the 240SX (JIC, HKS, Blitz, Apex'i, etc.) we're made to fit the SR and coincidentally, they fit the KA.

[zeroneonzn]

wow now i know what makes bak fire hmm interesting the things you learn each and everyday