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 Post subject: my *pop* pop* exhaust
PostPosted: Fri May 20, 2005 10:31 am 
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Joined: Fri Jul 30, 2004 2:07 pm
Posts: 32
Location: Mobile AL 36608
At the very beginning, my swift just got a K&N filter and exhaust. Stock ECU n header, but catless, pipe 2.5", pressure bend and it went to Remus muffler like stock orientation. Loud? Yes, it was/is. U saw the car after 30 secs u heard it. The low end was very weak, no back pressure, its liked no force at all to pull the car forward bet 1000~3000rpm. However, the mid and high end was great. The engine rev smoothly thru whole rpm. Especially 6000~7500rpm, the power of G13B was fully released. Excellent, I really enjoyed the power, I wish there was no rev limit.

Going thru several trials n errors, here is my current setup. K&N filter, N1 style muffler from ebay, header from suzukird.com(comment posted at review section), catless, press. bend and a resonator. Please check my album. From 1000~3500rpm, my car got pretty good torque like stock Swift. The exhaust sounds loud n rough at 3500rpm. When decelerating, there is popping sound at the exhaust after 2000rpm. *pop*pop*pop* sounds like back fire. After 4000rpm, a strong force pull the car forward. Mid range is fantastic! The performance at high end is still strong, but not as good with 2.5” pipe. Surprisingly, in the range of 3500~4000rpm is kind like a … turbo lag feel. Overally, it push strong thru whole rpm. Run 15.8 sec in 1/4 mile with terrible slipping clutch.

I know there is back pressure and restriction in my exhaust. I m still "trial n error" to find a best setup with good low n high end, i should say to make a power curve to suit my need. I wish my city got a dyno shop so i can fine tune it. BTW, the guy in the muffler shop only asks for 40 bucks to do the whole exhaust. Think i gonna switch to mantrel bend...

Found some goodie. Check it out.
http://www.jcwhitney.com/webapp/wcs/sto ... ogId=10101


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 Post subject:
PostPosted: Fri May 20, 2005 11:06 am 
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Joined: Tue Aug 10, 2004 12:35 pm
Posts: 3249
Location: Red Deer, Alberta
The pop is simply extra fuel igniting. You tend to have this happen on cars without cats to burn off the extra fuel on deceleration. Mine does it as well. Nice write up on your testing so far.

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 Post subject:
PostPosted: Sat May 21, 2005 6:42 pm 
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Joined: Wed Apr 09, 2003 6:22 pm
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Location: Vancouver, BC
My old car made popping noises on decelleration. It had an oversized exhaust with cat and a rally-spec chip supplying extra fuel.

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 Post subject:
PostPosted: Mon May 23, 2005 6:28 am 
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Joined: Mon Sep 06, 2004 5:56 am
Posts: 1092
Location: Zagreb, Croatia
The exhaust will pop if there isn't enough backpressure. If it's poping it's not good.
You don't need backpressure if you have a turbo... If you have unburnt fuel in your exhaust it will bang during shifting, and it can happen with a chip, but will not pop. After an exhaust valve is closed you get vacuum right behind it in the header, wich helps by sucking out the exhaust fumes after it opens again. That's why you need backpressure. So don't open it up too much.


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