exhaust problem~~

[rayracer]

halo guys,i wanna asking about the extractor (exhaust manifold)

i driving a satria 1.3 card,some people say a aftermarket performance extractor a part from 4-1 that piping,normal short is more better aftermarket long 1,cos gas run out to a point when 4 - 1 fast back pressure,aftermarket too long,back pressure to low respon.

which 1 right? izzit really truth just dun touch 4-1 part,just from 4 to 1 piping there weld it long more,got effect woh!!

if i wanna follow a size long normal 4-1 there custom in 4-2 follow by 1 (actually full is 4-2-1) to aftermarket performance type or stainless steel

where got do it? how much cost it? in batu caves JIAN HANG got do?

thanks and sharing it:_:

 

[Redline_club]

421 about rm2xx only, all exhaust shop got de, only c thier workmanship nice or not. my cousin do at seri kebangan

 

[rayracer]

i wanna know the theory of the exhaust.thx

 

[huakenny]

since u know where is Jian Hang, y dun u go there n ask the boss better?

u can customize watever u wan, no matter extractor or rear muffler.....as long as u got the money:_:

and i dun really catch ur meaning in here..:emoticon_U:

 

[rayracer]

hahahah~~ sorry bro thinking and writing is cannot show it,sorry english not good

 

[rayracer]

any body can telling me what extractor is good respon and pick up type?

 

[WhiteSpoonCivic]

ur best bet will be 4-1 for 'pick-up'.. u will lose on top speed due to the lack of back pressure...

 

[evoX2]

ur best bet will be 4-1 for 'pick-up'.. u will lose on top speed due to the lack of back pressure...

i thought 4-2-1 for pick up? 4-1 top speed?

 

[Redline_club]

i thought 4-2-1 for pick up? 4-1 top speed?

ya me too, my own car also 421, i c my cousin car so speedy so tht i install it haha, but pick up too le...

 

[WhiteSpoonCivic]

the more backpressure ur exhaust system generates, the more top speed u'll get

 

[evoX2]

the more backpressure ur exhaust system generates, the more top speed u'll get

how come from what i heard is totally opposite?

 

[WhiteSpoonCivic]

oops.. sorry... my bad.. i got the flow numbers wrong..

This 4-2-1 type exhaust manifold has an advantage that the flow of the exhaust gas is more efficient compared with the 4-1 type exhaust manifold. However, in this exhaust manifold, because the first runner and the fourth runner face toward each other, if the length of the first and fourth runners is too short, an exhaust gas interference cannot be avoided in accordance with the igniting sequence (first cylinder.fwdarw.third cylinder.fwdarw.fourth cylinder.fwdarw.second cylinder). As with the 4-1 type exhaust manifold, the spacing between the runners is narrow where they join the confluence part, again resulting in thermal stress cracks.

so the 4-1 actually creates more backpressure and the 4-2-1 generates less.. sorry..

 

[kenzo]

heya bro, do u mean top speed meaning, the more toruqe and horsepower at higher rpm? or do u mean by easier to reach top speed easier? thanks alot bro

 

[WhiteSpoonCivic]

this is what i found out...

4-2-1 are for street use. coz they kick in at low rpm's. plus it's best for cars below 1600cc displacement.

4-1 are for race. they kick in at 3000 rpm onwards. best for cars w/ 1600cc displacement and above.

 

[evoX2]

yup, thats right. i.e. 4-2-1 for better pick up (less than 3k rpm) need more back pressure, whereas, 4-1 better top speed because of free flow.