that's why, dun drag-race la, no fun. even if u win, it's just the car win, not the driver.
best type of street race i prefer with few traffic, and involve corners, the more the better.
it takes driver skills and lots of GUTS to race in those conditions

I am the owner of 2004 1.5GLI fuel injection SVDO manual sedan wira.
I have the problem of my car pick up was no power, car were drag and heavy when change gear from 1 to 2.

After get some advice from forum and mech.
I plan to change the following items:-

1. Good Spark Plug
2. Air Filter
3. Whole Exhaust System (4-2-1 Extractor, bullet and muffler)

But, different people have different advices and comments. Make me confuse what should i go for it.

Q1. Some said small Cc cars go for drop in air filter that will be good enough, if use open port the performance become worst. But, some said manual car go for open port to get better performance. Which statement is correct?

Q2. Some said if you want pick up go for 4-2-1 extractor, top speed go for 4-1 extractor. some said manual car go for 4-1 extractor to get better performance. Which statement is correct?

Q3. Some said s-flow muffler for pick up and more silence, straight muffler for top speed and more noisy. but, my mech advices me s-flow no power, straight can improve pick up, top speed and can select the types that not so noise. Which statement is correct?

Q4, some said thi mod will increase FC. but, some said it will decrease FC. Which statement is correct?

Q5. Titanum exhaust system will increase more in performance? How many inch exhaust piping can recommences for me? 2 bullet better than 1 bullet? My stock exhaust system can trade in?

Hope SIFU-SIFU here can share your knowledge with me.

no lar... just tat he cucuk me... dont like it then try to cut other car so tat he cucuk other car instead of mine..
consider with the driver mar.. cause he got no guts to cut here and there...
mine wira only ler... tat vios vvti tech and twin cam
mine only single cam

kazami no worry be happy ... hahaha

Cannot complain much la since its free.

Shop in kajang. Yest from kajang rush back kl. 155km only. =(

spark plug- change higher heat range (im not too sure will this help or not?)

q1)air filter - depend on u... both also can but some ppl prefer to go with drop in.. just get those after market drop in filter will do... if u got play high rev then go for open pod

q2) for daily use car, just go for 4-2-1 which is also suitable for normal use or street use.. if u want to go for 4-1, u going to use tat car for daily use more... dont tell me tat u gonna play top speed everyday when u drive ur car right...

q3)ur mech is right... s-flow mostly for auto car as auto need back pressure.. go on with straight flow but choose those not noisy type...

q4) more power = higher fc.. but depend on ur right leg actually... got more power = respond better therefore u step the pedal lesser for the car to go...

q5)got such thing titanium better?? just go to exhaust shop and request for perfect bending aka mendrel bending... so it wont mess up the air flow... bullet, i not too sure... depend on u.. some said bullet will make ur exhaust more quiet and ur fibre for muffler will last longer... diameter for the piping maybe u can go up to 1.8 or lower.. as long as it is bigger than ur current want..

hope this info helps u

this kinda situation, when u win, it just shows very obviously how far your skills (and GUTS) are compared to the other driver liao, coz "equipment" wise, he should have better advantage and if u lose, then....ahem.... blend in with other wira and hide lor

not to say win or lose, just tat front got traffic... y want to cucuk me when front car also slow.. yeah... better advantage... my house also got a stock vios, i know how well the car can perform... if he is a skill driver... i confirm GG already..

btw how u all determine the fibre at the exhaust? .. my exhaust already changed when i got the car (dunno wats the type also but is straight flow) ....

Please read bro Kazami's reply. I'm also trying to learn from everyone. Coz read online, too many advise and its hard to decide (often makes it even harder to decide!) anyway, here's my take, please remember it's just my opinion.

actually to solve your "pick-up" the most obvious should probably be lightening your flywheel. but if you cruise at high speeds, then this may need proper consideration as the flywheel is needed to maintain inertia. also if u drive uphill a lot, better dun touch your flywheel. As for sparkplugs, forget it la. I think the gain is not significant unless you also upgrade other parts, like ignition coils, cables, etc. if only change plugs, dont expect much, might as well use normal plugs but change frequently.

Q2 and Q3: i'm especially interested in the part about exhaust muffler (because i havent change my muffler). i will very probably go for an s-flow as the back-pressure should help with low-mid RPM power. my personal opinion (not proven) is that back-pressure is needed for low-RPM range, and is bad for high-RPM as it is restrictive. it has got something to do with the "pulse" of the exhaust notes (the gas comes out in pulses), so back-pressure helps to "move" the gas out. But once you are at high-RPM, the gas needs to get out ASAP, and so a straight-flow is preferred. For me, I drive mostly city (start, stop, go) and only weekend highways so I will be opting for S-flow (low-mid RPM is important to me). I seldom press until 5k on the RPM meter for each gear. On highway also only 4k RPM and cruise. anyway, just to share that i'm also driving a 1.5L M sedan and i've changed to the following: 4-2-1 extractor (original was 4-1 and it sucked), removed catcon, replaced with swirl bullet (this one, i think u can skip bullet if u like), and changed entire piping to 1.7" size. can already feel difference (butt dyno haha) especially once i hit 3k rpm, the engine feels livelier and willing to go up to 4-5k very easily. Previously without exhaust mod, when i hit 3k RPM, the engine sounds like desperate and tired di. i not sure which made the biggest difference tho, maybe extractor, maybe larger piping (new) or maybe coz i removed catcon. take your guess.

Q1 :regarding air filter, i took shortcut as many of the bro here know i drilled holes on the ori airbox. maybe is placebo effect, but feels like engine respond better when suddenly press accelerator (can hear loud sucking noise from airbox). still using stock filter as short of $$$

Q4 I do not agree with what most ppl say about increase FC when we mod the intake and exhaust. I personally is keeping track of my mileage using simple spreadsheet so I know my FC improved after my exhaust mod. I think i can get even better FC than what i have now if i can resist not revving my engine above 3k RPM coz my exhaust note starts to sound really nice when i reach 3k RPM all the way to 4.5k RPM so i usually drag the gears til there before i up-shift (they say keep lower RPM can save fuel ma, i doing opposite). damn i love the exhaust note. Going to change muffler soon, so should get even better sound soon! i dont like loud, but i love that bassy vroom sound hehe. anyway back to story, if you are disciplined enough to keep your usual acceleration habits AFTER you mod your exhaust, you *should* be getting even better FC than before. Also another thing, bad exhaust setup = bad FC.

Q5: dunno about trade-in prices, but usually dont expect much. Keep your cat-converter tho. this one cost a lot and keep just in case u wanna sell ur car someday. can put back. if you using single pipe, den just use 1 bullet la. twin bullet only if u have twin piping, i guess. piping size, mine is 1.7", i think is fair, like bro Kazami said. dont too large, else no enuf back-pressure.

---

Added on May 28, 2009, 3:12 pmphoto lai lai
coz i curious about muffler also

This post has been edited by masao343: May 28 2009, 03:12 PM

u take a piece of wood... knock and see..
if u heard like empty can/tin sound... then inside is empty... just like u take a can of coke... when it is not open, u know and u know there is coke inside... but once u open finish it, the sound will show empty inside...
my car exhaust system still original and just change muffler tip to make it look nicer

masao, i also agree that good exhaust system wont really increase FC.. they delivers better power and respond therefore u press lesser pedal for the car to move... u said ur car come with 4-1 extractor? i tot most wira come with 4-2-1?
as for my car, come with 4-1 too maybe because my car is export model that y abit different...

This post has been edited by kazami: May 28 2009, 03:22 PM

Kazami, i really appreciate your advices.

If, i go for Open port. How many inch will you recommence to me? K&N and Blitz, which one is better? i compare with Blitz because it's maintanance free, no need re-oil like K&N and made by stainless steel, absorb cold air.

4-2-1 extractor and straight muffler is my choice now. I find that Power Zones is a good brand for extractor, it sales their exhaust piping and muffler also? Where can i get it in KL area? or any good brands and good services shops can recommend to me?

perfect bending aka mendrel bending?? Air filter should come first or Exhaust system come first?

okok .. will take later after work .. but gotta wait for gf coz her phone n82 can take photo, my photo cacat one...

condo parking takda piece of wood le ... use fingers can ah ? haha
so just to confirm muffler is the big tin behind the exhuast tip right? ... not sure the previous owner got change muffler or not, i only notice the tip is different from others ...

from wat i read, normally wira is 4-1 ... except for the newer ones and SE ... not sure wat year does it stand for the newer ones .. haha

yeah.. powerzone extractor is good cause they did R&D and it is not cheap... almost 500 for extractor only.. piping they do have but muffler im not too sure..
for powerzone stuffs... better get from them... they located at glenmarie shah alam...
as for ur air filter, i wouldnt agree about absorb cold air... cause u need heatshields and cold air intake for it to be more effective

not too sure how to explain to u for the mendrel bending... but definitely better and cost abit more...
it is up to u... air filter is much cheaper compare to full set exhaust setup

This post has been edited by kazami: May 28 2009, 03:46 PM

mine is 4-1 wor.... i didnt event bothered to keep it, really piece of crap haha
but i miss the heatshield

@kazami, u din explain ....
if inside is empty means muffler no more fibre? if empty then wat happen ah? .. kaboom ?

i see... u can use ur hand if u want..
as long as u can predict it then can lor

wont kaboom lar.. some said sound louder and affect FC... but i dont care at all..
i believe mine is totally empty already... and yet still using... no $$$ to go for better 1

hmm .. i rmb reading here a thread explaining about exhaust, u all rmb where ma? ..cant seems to find it ...
btw offset explaination is in Saga Club thread ...

@kazami, then i think mine also empty one .. kinda loud also at times ... will knock and feel later ...

[quote=masao343,May 28 2009, 03:11 PM]
Please read bro Kazami's reply. I'm also trying to learn from everyone. Coz read online, too many advise and its hard to decide (often makes it even harder to decide!) anyway, here's my take, please remember it's just my opinion.

actually to solve your "pick-up" the most obvious should probably be lightening your flywheel. but if you cruise at high speeds, then this may need proper consideration as the flywheel is needed to maintain inertia. also if u drive uphill a lot, better dun touch your flywheel. As for sparkplugs, forget it la. I think the gain is not significant unless you also upgrade other parts, like ignition coils, cables, etc. if only change plugs, dont expect much, might as well use normal plugs but change frequently.

Q2 and Q3: i'm especially interested in the part about exhaust muffler (because i havent change my muffler). i will very probably go for an s-flow as the back-pressure should help with low-mid RPM power. my personal opinion (not proven) is that back-pressure is needed for low-RPM range, and is bad for high-RPM as it is restrictive. it has got something to do with the "pulse" of the exhaust notes (the gas comes out in pulses), so back-pressure helps to "move" the gas out. But once you are at high-RPM, the gas needs to get out ASAP, and so a straight-flow is preferred. For me, I drive mostly city (start, stop, go) and only weekend highways so I will be opting for S-flow (low-mid RPM is important to me). I seldom press until 5k on the RPM meter for each gear. On highway also only 4k RPM and cruise. anyway, just to share that i'm also driving a 1.5L M sedan and i've changed to the following: 4-2-1 extractor (original was 4-1 and it sucked), removed catcon, replaced with swirl bullet (this one, i think u can skip bullet if u like), and changed entire piping to 1.7" size. can already feel difference (butt dyno haha) especially once i hit 3k rpm, the engine feels livelier and willing to go up to 4-5k very easily. Previously without exhaust mod, when i hit 3k RPM, the engine sounds like desperate and tired di. i not sure which made the biggest difference tho, maybe extractor, maybe larger piping (new) or maybe coz i removed catcon. take your guess.

Q1 :regarding air filter, i took shortcut as many of the bro here know i drilled holes on the ori airbox. maybe is placebo effect, but feels like engine respond better when suddenly press accelerator (can hear loud sucking noise from airbox). still using stock filter as short of $$$

Q4 I do not agree with what most ppl say about increase FC when we mod the intake and exhaust. I personally is keeping track of my mileage using simple spreadsheet so I know my FC improved after my exhaust mod. I think i can get even better FC than what i have now if i can resist not revving my engine above 3k RPM coz my exhaust note starts to sound really nice when i reach 3k RPM all the way to 4.5k RPM so i usually drag the gears til there before i up-shift (they say keep lower RPM can save fuel ma, i doing opposite). damn i love the exhaust note. Going to change muffler soon, so should get even better sound soon! i dont like loud, but i love that bassy vroom sound hehe. anyway back to story, if you are disciplined enough to keep your usual acceleration habits AFTER you mod your exhaust, you *should* be getting even better FC than before. Also another thing, bad exhaust setup = bad FC.

Q5: dunno about trade-in prices, but usually dont expect much. Keep your cat-converter tho. this one cost a lot and keep just in case u wanna sell ur car someday. can put back. if you using single pipe, den just use 1 bullet la. twin bullet only if u have twin piping, i guess. piping size, mine is 1.7", i think is fair, like bro Kazami said. dont too large, else no enuf back-pressure.

masao343, really appreciate your sincere sharing and advices.
So, what you had done is change 1.7" exhaust pipe, 4-2-1 extractor and drilled holes on the ori airbox.

As what you has mention that Bad exhaust system setup will cause Bad FC and permance. This is why, i need a Good exhaust system setup advices, i no want to headaches later.

Normally, my car is use for city drive and travel from KL to penang my hometown every 2 weeks or 3 weeks.
Mind i ask your car is 4G15 or 4G91 engine, fuel injection?

I has removed catcon, replaced with swirl bullet. trade in and add up RM30. but, felt no much improved.
i drilled holes on the ori airbox , first time i hear it. Hope can get a photo from you.

What your top speed now? increase or decrease after this mod?
Hope that can share which shop and how much you speed for this mod

This post has been edited by cwd8769: May 28 2009, 04:00 PM