Just installed b16a into 88 dx, everything runs good, but at about 3000 rpms i get a cracklingsound coming from the exhaust. It isn't very loud like backfiring or anything, just wondered what you thought. I am running a test pipe with a obx catback exhaust but a stock header (havent gotten the new one yet). Any ideas what that is or does anyone else get this crackling?

 

detonation? what gas are u running? only at WOT or all the time above 3k?

 

on acceleration or deceleration? OR not trying to start anything, are you referring to rhe rice noise it makes. iv'e heard obx before, not the greatest sounding to me. around 3000 rpm is when it will make a "rice" noise, like, "maaah". but if it is crackling, it would be from the test pipe because mine will do that on decel like, "brup brup brup brup pop pop".

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlickCRX &raquo;</TD></TR><TR><TD CLASS="quote">around 3000 rpm is when it will make a "rice" noise, like, "maaah". </TD></TR></TABLE>

LOL!!!

MAAAahhhh!
Sounds like me calling my mom!

I've heard rice exhaust that doesn't include a resonator. It sounds like big bumble-bees bouncing inside a tin can.
Like "frraat-tat-tat-frrr-tat-tat-brrrrrrrrrr-tat-tat-fraaaat"
Just like that!

could be running rich and you're getting a little backfire during shifts and decel.
???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicLX &raquo;</TD></TR><TR><TD CLASS="quote">detonation? what gas are u running? only at WOT or all the time above 3k?</TD></TR></TABLE>Running amoco premium 93 octane, it happens at any throttle at all and even deceleration(alot less noticible though and sometimes at a little bit highter rpms during deceleration, say 4000 rpms). But no it isn't at WOT-it happens at any throttle.

 

why the **** are you running 93 octane on a bolt on b16?

 

if it's a metal on metal type rattling check your heat shields and cat heat shields....usually the culprit for mechanical rattles

--gabriel

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">

could be running rich and you're getting a little backfire during shifts and decel.
???

</TD></TR></TABLE>

I don't mean to change the subject and all, but that sounds like what I'm getting. Of course, my exhaust is busted off after the resonator (waiting for my RS*R ExMag to get here!!!) so maybe that has something to do with it. Anyway, how do I tell if I'm running rich, and how would I fix it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full Race A6 &raquo;</TD></TR><TR><TD CLASS="quote">why the **** are you running 93 octane on a bolt on b16?</TD></TR></TABLE>

Is 93 octane bad or something?!?! I used to have a civic si 1999 and you need min or 91 or 90 octane in that enigine. I know you can use 87 or 89 or whatever, but that is like saying you can go 7000 miles between oil changes. It will probably still run ok, but would it hurt to change it every 3000 miles? No. So what is the problem with running 93 octane? We have 87 89 and 93. Which one would you choose Full Race A6?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full Race A6 &raquo;</TD></TR><TR><TD CLASS="quote">why the **** are you running 93 octane on a bolt on b16?</TD></TR></TABLE>

because thats what they take

 

Seems like a waste to me for a stock motor. I bet 91 would still be perfect.

You guys have 93 octane everywhere?

Highest I can find is 91 and Im running 12.4:1 copression just fine...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full Race A6 &raquo;</TD></TR><TR><TD CLASS="quote">why the **** are you running 93 octane on a bolt on b16?</TD></TR></TABLE>

Why not?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full Race A6 &raquo;</TD></TR><TR><TD CLASS="quote">Seems like a waste to me for a stock motor. I bet 91 would still be perfect.

You guys have 93 octane everywhere?

Highest I can find is 91 and Im running 12.4:1 copression just fine...</TD></TR></TABLE>

Is there any disadvantage of running 93?

 

the diferance between octanes is how quickly it explodes. i forget weather higher octanes ignite quicker or slower but yeah i thaught i would throw that in.

 

yea my exhaust does the same thing it just getting a raspy sound my brothers car did it after he replaced the cat with test pipe.

 

Yer i have a 89 crx si jdm with a zc (DOHC ZC - JDM), with simota chrome intake, k&n xtream flow filter, stock headers, and full 5zigen 2 1/4" exhaust, and mine does the exact "brup brup brup brup pop pop" on decel as slickCRX sed. Y does it do this? i have no resonator or cat, as here in NZ we dont have to have them

 

Well the whole point of a performance exhaust is to open up and let the engine breathe right? The popping noise when you decelerate can be caused by two things..if you have a resonator/glasspack..could be that or something called backpressure. Makes a popping noise as the RPM's creep down. Happens all the time on hondas and pretty much most 4 bangers heh.

 

it could be your valve seals no long creating a full vacuum which creates that burping sound during shifts and deceleration

 

Ahh true, but is it bad? will it do any damage? yer ive herd quite a few hondas do it, and im pretty sure my car has always done it