421 Vs 41

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carsial

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carsial

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hi zthrians...
before i wud like to mod my exhaust..wud like some opinions from u guys..
1) its said tht 421 has more lows and 41 has more highs..is it true?
2) if i'll b using 41...will my FC b higher if i travel on busy roads wompared to 421?
thanks in advance!
hope for the reply...cheeers!
 

sakuraguy

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sakuraguy

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1) its said tht 421 has more lows and 41 has more highs..is it true? - YES
2) if i'll b using 41...will my FC b higher if i travel on busy roads wompared to 421? - YES

:) .. 421 is common and just go for it .. dont end-up on illegal mods.
 

Nieto

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Nieto

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but if use automatic transmission, dun use 4-1... u will lost a lot of power
 

fstr

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fstr

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xtorm said:
hmm i sue 4-1, really fast rpm, smooth high rev, an iswara feeling pull at 7k is fun...hha

4-2-1, more torque for the hills climb...

wahhh u SUE 4-1 haaa??? so keng haaa??? :p
 

Joeker

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Joeker

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4-1 is for hi rev.

As engine speed increases, the exhaust will need to go out faster. The collector at the 421 will reduce the flow. Therefore you will notice 4-1 primaries are usually very much longer than 4-2-1

4-2-1 is for low and medium revs. The collector acts as a siphon to expedite valve overlap scavenging and boost back pressure.

Howeverm if customizing is possible, you may increase the primaries' lenght of the primaries on the 421 tp get higher rev flow or reducing the primaries of the 41 vice versa, the point is to get something in between.
 

Nieto

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Nieto

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may i ask, y sum extractor flexible? i heard flexible will be better~?? any different flexi and not flexi??
 

Joeker

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Joeker

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All extractors are flexible/

It only depends wat they use.

For example Protons, they use a flexible hose which looks like a pineapple.

If not mistaken, Honda engine don use "pineappales" but they have a ball joint with spring retainers

These flexible joint allow for engine movement and vibration.
 

cooljas

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cooljas

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I can say, if the engine is fully modded eg, high cams, hi compression piston, port n polish...using a 4-1 on a fully modded engine it will gain power at every rpm..ppl say it will kill the torque n will improve in high end which i believe tis saying is 'bullshit'!
For those basic mods i will recommend 4-2-1 n it will be sufficient enough...if basic mod engine use a 4-1 then it only kills the torque

Juz my point of view, hope tis helps!!
 

swap aka SWAP

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swap aka SWAP

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It also type of the 421 or 41 brand ma..me used svt 20v..eng standat also can used 4-1..cusco brand la..eng feel light..very easy to go to 6k rpm..ya..41 for high rev eng..
 

alvin24

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alvin24

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4-1 is optimized for pick up and top speed oso lerz... it increases your high rpm torque.

4-2-1 is optimized for low-mid range torque... excellent for city driving.

Reason 4-1 has higher FC on city driving than a 4-2-1 is because the 4-2-1 has better mid range torque than a 4-1.... so if u use a 4-1... u'll end up tekan more to reach your desired speed.
 

gohkokeng

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gohkokeng

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hahahaha can it be concluded simple like this:

421 = good for low RPM rev (perhaps below 4 or 5 k?)
41 = good for high RPM rev (perhaps above 4 ot 5k?)
 

Nieto

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Nieto

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tat mean, nid to match with ecu eh~ and gearbox~
 

gohkokeng

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gohkokeng

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haha i duno wo.....mine ANALOG stuff la......Carburetor Engine

somemore i not yet mod any exhaust system....only Apexi Power Intake (Open Port) soon will..... but for sure going for 421 cause manual
 

Nieto

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ha ha... mine auto but using 4 in 1... bought custom made for racing 1 rm50 2nd hand he he... only high rpm got power, if city drive, wa... suffer~~
 

Gti

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gohkokeng said:
hahahaha can it be concluded simple like this:

421 = good for low RPM rev (perhaps below 4 or 5 k?)
41 = good for high RPM rev (perhaps above 4 ot 5k?)
not necessarily so.
perhaps what u juz said could be more confusing :Not_Impressed:
Stick to what joeker and alvin24 said.
 

gohkokeng

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gohkokeng

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haha alot theories out there

some said:
421 best for manual
41 best for auto

more best
421 + straight flow muffler for manual
41 + S-flow muffler for auto
 

Nieto

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Nieto

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erm S-flow for muffler i not so sure y lar, reduce noice gua~ cos i using straight flow muffler for my auto car now... if maintain rpm at 3, wao, sound like aeroplane wuu wuu wuu wuu..
 

pleezn

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pleezn

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i agree with cooljas.
from my experience(wasting money)
if using engine 1.8 heavy mod ( 272 cam) use 4-1 is okay because 1.8 has more torque.in other hand if using 1.6 u will end up lose everything, pickup,mid and topend.

example la, (a) b18c type r 98 spec std is 4-1.
(b) satria R3 stage 3 4-1 (with stage 3 cam)
 

Nieto

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gohkokeng said:
haha alot theories out there

some said:
421 best for manual
41 best for auto

more best
421 + straight flow muffler for manual
41 + S-flow muffler for auto
waaa.... 41 whr got power for auto -.-ll
 

gohkokeng

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gohkokeng

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haha i duno Nieto, all this i learnt from here ZTH from many many sifu

some1 really need trial and error for every1
 

gohkokeng

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gohkokeng

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lol duno, i think all this depends on many factors

some said with 1.8 engine manual also should use 4-1 because 1800cc engine has the power to maximize 4 into 1
 

Nieto

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Nieto

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pokoknya... dun use 4-1 at auto ha ha... my car nid high rpm baru strong!! and take note, if use auto, if put D.. it will change gear continously and maintain low rpm... so, no power!! ha ha
 

gohkokeng

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gohkokeng

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haha really ma.......

different car, different piping, different extractor, different bullet and different muffler give u different result
 

pi1.3

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pi1.3

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gohkokeng said:
haha really ma.......

different car, different piping, different extractor, different bullet and different muffler give u different result
I used to used 4-1 on my 1.3 iswara.the power my car gain started at 4++k rpm(top speed abt 160km/h 4th gear) but pickup lousy la....then i asked the workshop to customized my 4-1 into 4-2-1.what they did was the 4 pipes from the outlet to the 1 pipe,they cut & joined it into 2 then 1.so 4 all the way from outlet to the bottom of the engine then 2 all the way to the silencer then 1 until the straight flow muffler.after the customized installation,my car's pickup n topspeed improve quite alot.(1st gear=60km,2nd gear=110km,3rd gear abt 140/145km then 4th gear all the way to 170++km)i never had the chance to feel my 5th gear coz my clutch & flywheel are standard.4-2 pipes size=1.6 inch from the 1 = 2 inch all the way to the muffler.for the FC,it's not as worst as the 4-1 in city.
 

gohkokeng

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gohkokeng

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bro pi1.3
i not so understand

u meant your extractor 4-2 only then did not combine to 1 piping instead u using double piping?

(1st gear=60km,2nd gear=110km,3rd gear abt 140/145km then 4th gear all the way to 170++km) mind tell at what RPM all those?
 

Nieto

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double pipe? tat mean double muffler ka?... i oso not really understand...

btw, if 4 - 2 double pipe and double muffler, good or not?
 

gohkokeng

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gohkokeng

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maybe new invention lol

4-2 --> double piping --> 1 bullet for each piping + 2 mufflers?
 
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