what is causing the popping noise?

[j32pilot]

Hey everyone, I just got my new headers put on. I have a set of 4-2-1 2 piece, straight pipe (hi flow) cat converter, 2.5 Inch piping, then a Tenzo R muffler. When I step on the gas it sounds good, when I let off it makes a popping noise? Is this too much air coming out or what? How can I stop this from popping. Is it normal? Please help. Would it stop if I put the stock cat back on? Thanks. Mike

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My Webpage http://www.geocities.com/civicsihatch

[revhardracing]

you might be running rich or lean, not sure which way it would be. or it just could be you dont have any back pressure and that is what it does. but what the hell do i know?

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[gotatight92si]

sounds like little-to-no backpressure, and/or poorly piped/welded/flanged system. my DX did that with my custom 2.25 piping...it sounded like crap. any GOOD system won't have that popping sound associated with a poorly put together system. if you're engie is stock, 2.5" might be slightly too large anyway...

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[j32pilot]

Its not 2.5, dont know why I put that. It is 2.0 inch. Just slightly over stock. Will I get some back pressure by putting stock Catalytic Converter back on? How can I get more back pressure? I tryed messing with the timing, no luck.... Also this is this buzz through 3-4 thousand rpm's. Sounds like total shit. Kinda like RICE!!! I hate that shit. Anyway, anyone know of any pointers?

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My Webpage http://www.geocities.com/civicsihatch

[sastanley]

that 3-4k buzz is taken care of by the resonator which in stock form is located just behind the cat. it is a little bulge in the pipe...this is supposed to handle the bumble bees in your exhaust
The popping could be from a leak and it may be a small backfiring...make sure you have no leaks...you will see little black streaks (exhaust gases leaking out) at seams/joints in a few days if you have leaks. The cat is supposed to burn up those gases on their way out, if you have removed it, you could be igniting those gases again with the fresh oxygen leaking in your exhaust in the pipes.

But I am no expert, there is my $0.02

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-Shawn
91 DX 4-door
AEM CAI & other mods which only add weight like fog lights and a gauge or two

Coming soon:
ZDyne controlled ZC
Si tranny w/ ACT clutch

[civickiller]

you mean the popping noise when you rev your car and you let off the gas and your exhaust goes pop, pop, pop. idk about you guys but i think thats the coolest sound in the world i hope my car does that when i get an exhaust. don try and get rid of it. that sound is cool

[civic1991]

I would put the stock cat back on and go to the place you got the exhaust and have them put a baffle on after the cat($15 at wal-mart for a baffle). On the SOHC's if there is not a proper amount of back pressure you will most likly toast your piston rings. With backfire it sounds like your running rich anyway. that will burn your rings quicker.
If you hate that RICE crap why did you buy tenzo R exhaust(RICE BRAND)?

<font color="#a62a2a" size="1">[ April 05, 2002 10:04 AM: Message edited by: civic1991 ]</font>

[j32pilot]

Its what I could afford at the time. I didnt know the difference when I bought it. Now I do. Anymore assholes out there?

[darolh]

"that will burn your rings quicker."

Who the hell fed you that line of bull!!!?

[civickiller]

hey darolh, that true what he said. say you had a V6, if you put no back pressure on one side and left the other side with stock back pressure, then after 5 years compression test it and the side with the stock will be higher than the side that has no back pressure