extractor & exhaust

• dazzler

  5 Jul 05, 22:46

  hi guys i wanted to change my exhaust of my mit lancer CS3.i went to a workshop n he told me its better to add in a 4-2-1 extractor too.i asked him y n he told me its better as it helps with e fuel consumption when i change my exhaust.exhaust is hot bits.told me extractor costs $200 plus....i kn its illegal to put extractor.he said when my car goes for servicing he will put back my org exhaust.i wanted to know if anyone has done this mod.is it worth it n performance wise is there any diff?i heard fc is also affected.anyway wat is a function of an extractor?tks for yr advise guys!
• TRD_Sport_M

  5 Jul 05, 22:55

  dun change xos.. just operated it will do!
• Ah Wei

  5 Jul 05, 23:13

  Fabricating your extractor to 4-2-1 sure got helps and can fee the diff but its not legal.
• Gedanken

  5 Jul 05, 23:35

  You're going to have to check how the extractors go with your engine. If it's designed to have a specific amount of backpressure, you're going to find a loss of low-end torque when you install the extractors, and you may have to modify your intake accordingly.
• dazzler

  6 Jul 05, 16:18

  dun change xos.. just operated it will do!
  
  hmmm i dun quite wat u r sayin......
  
• dazzler

  6 Jul 05, 16:21

  backpressure meanin?lost of low end torque means slower acceleration is it?adjusting my air intake do u mean e air filter or is it anythin to do with e ecu?
• Gedanken

  6 Jul 05, 17:38

  Backpressure is the pressure from the gases that are left in the combustion chamber at the end of the exhaust stroke. Many engines are designed to take advantage of this backpressure, so that the residual gas and the gas taken in during the intake stroke contribute to the pressure in the chamber at the point of ignition.
  
  Extractors help exhaust gases flow out of the combustion chamber more freely, so that less gas remains in the chamber at the end of the exhaust stroke. In turn, there is less gas (and less pressure) at the point of ignition, which results in less force pushing the piston down.
  
  Extractors give you an advantage at higher revs, where it allows the exhaust gases to be pushed out faster by a faster-travelling piston. However, because of the lower compression at ignition, you'll experience less power per stroke, and without the advantage provided at higher revs, you'll find that the engine will be more sluggish at lower revs.
  
  Basically, you're left with only two corrective options at that point: either go back to the old exhaust, or modify your intake so that more gas (in the form of fuel-air mixture) is taken in with every stroke, thereby increasing the compression at the point of ignition.
  
  I haven't had any experience doing this with a fuel-injected engine, but with a carburetted engine, modifying the intake usually means getting a bigger carburettor. You can turbocharge or supercharge the engine, but that becomes a question of whether it's worth the cost and trouble.
  
• jonathan_n80

  6 Jul 05, 18:38

  Originally posted by dazzler:

  hi guys i wanted to change my exhaust of my mit lancer CS3.i went to a workshop n he told me its better to add in a 4-2-1 extractor too.i asked him y n he told me its better as it helps with e fuel consumption when i change my exhaust.exhaust is hot bits.told me extractor costs $200 plus....i kn its illegal to put extractor.he said when my car goes for servicing he will put back my org exhaust.i wanted to know if anyone has done this mod.is it worth it n performance wise is there any diff?i heard fc is also affected.anyway wat is a function of an extractor?tks for yr advise guys!

  go enlarge ur throttle body. +BHP and almost legal coz u cant get caught.
• endless373

  6 Jul 05, 18:51

  Originally posted by TRD_Sport_M:

  dun change xos.. just operated it will do!

  I believe operated exhaust muffler will be louder thus can pass inspection ???
  
  Will there be any power gain from operated exhaust muffler ???