Hi all, i just change my wira 1.5 ori extractor to powerzone 4-2-1 at powerzone dealer..but after one day,my check engine light was keep on,after check with the boss,he said O2 sensor is spoil,he give me excuse that maybe ngam ngam my o2 sensor wan spoil oredi,and the spoil is not his false...so i wan to ask izit it's due to workmanship problem or other root cause? Thanks

where u change it??.. possibly workmanship problem...

Umm..so you're suggesting that i leave it as it is? The exhaust sound seem quite loud...I wonder if there are any other solutions Prefer not to revert back to stock la..

M-Power Automobile at Penang.....Powerzone authorised dealer..

http://www.powerzone.com.my/cms/index.php?...id=17&Itemid=29

No-la, I ask u to either replace ur bullet or ur muffler but don't add 2nd bullet

not much u can do if they dont admit... u still have to change new o2 sensor...

My satria neo CPS mid section piping is 1.75inch, my rear muffler 's piping is 1.7inch(because come with the muffler).. Will increase back pressure but wont cause restrictive airflow right when the air pass from 1.75 piping to 1.7.

Any guru here have any idea what is savvy default exhaust setup? I am trying to check see the previous owner did any modification on it or not.

ur setup is still ok coz when exhaust gas reaches the mid section, it starts to slow down due to decrease in exhaust gas temperature... hence, u need to create a bottleneck so exhaust gas can flow through it faster and exit quicker...

Why i see some exhaust mod got sparks coming out?

dat one is called misfiring... it has pros and cons...

Not flames, "sparks". If misfiring, sure got loud sound. And the sparks came after the car slowing down to idle.

if sparks i dunno liao... never seen any car can spit sparks out from their exhaust...

Fcon's firing retard???

Sparks (not fllame)? I was once seen it on a VW Bettle (not the new Bettle, the boxer type instead) when the foreman was revving the engine, had not idea y sparks occurs

What are the advantages and disadvantages of having single bullet and multiple bullets (can ones having more than 2 bullets in an exhaust system?)?
I do understand that having bigger muffler will produce less noise (or am I?) but what about the tips? bigger = better or it's just pure cosmetic?

Thank you sifus in advance for answering

This post has been edited by ss1st: Jan 26 2011, 05:43 PM

spark like how? i've seen a muffler sound like "pongg2" which its not a flame, its more like small xplosion at the muffler tip.. c it at toyota celica mechanical version (which come in 1.8 vvti if not mistaken) while following it..

More bullets, better sound dampening, more back pressure. Most setup requires at most 2 bullets. This also very much dependent on piping size, muffler type, extractor n engine tuning.

The tip size is mostly for cosmetic purpose.

that 1 is rev cut but not the convention rev cut by stopping the injector but rather shutting off the ingnition
normally this is done to race car by using stand alone ecu
the fuel continue pump by moving piston and flood the exhaust system and later the ignition restart and burn all the unburnt fuel result in a small explosive like u said lo
the logic is the unburnt fuel generraly cooled the combustion chamber for the moment

or the second way is my way
this apply to carb engine and manual only

first get to speed then press ur clutch the switch off ur engine not to lock but to acc to kill the ignition
later when the ignition system is off release the clutch to make the engine run to pump and flood fuel inside the whole exhaust system
then switch on and will hear a pap sound

3rd way is just lousy maintain engine and misfire accured
nuff said

This post has been edited by sinister_sid: Feb 5 2011, 04:14 AM

What is the intention of the second one mentioned above? And what does a driver get by doing it?