It is not compulsory. Changing the whole piping to a bigger inlet size will smoothen ur ride in high ends. But, it also depends to the end muffler u r using. If u r using straight flow, it is recommended to change ur piping size as well.

not really necessary, but it is better to do so
But beware of your FC, sometimes it helps sometimes it doens't~~

You mean by changing the header or the piping that might affects the fc? The header that i wanted is the one from powerzone

thom_chai,
the only reason you fuel consumption might increase is because you think you feel the power, so you keep a wide open throttle (WOT).

the feel is minimal and will leave you wanting more power.

nah.. i dont think he means that..but headers depend on individuals. Everyone's driving style isn't the same, u might wanna rev until 3krpm and shifts...but some will like to revv till 6krpm and shifts...So, the power needed at different rpm band needs different header designs.

What I mean is by the piping, header its okay

Piping won't really affect your FC if you mod the piping to bigger size but remain in the correct range of inlet size. Try not getting sizes which is not suitable and my opinion would be changing to +15% would be the best. However, if you've modded the system to TOTAL straight flow, then, i would think it is compulsory for you to go for bigger piping but not too big like i have mentioned, this is to increase your HP or top speed. Like wise, if you're on SFLOW setup(swirling bullet/sflow muffler/4-1 extractor), i would say NO to piping size increment. Just my 2 cents afterall

This post has been edited by kweng84: Jan 24 2007, 11:47 AM

what is the best setup for kancil 660?

If change 3-1 extractor have any effect?

Bro, stock design is already 3-1. However, changing to a bigger inlet one will help in better pick up power.

i have a question...

presume i have 2 sets of 4-1 extrac..

but the join for the 4 pipe is at a diffrent position..

one is nearer to the engine...one is further...

so what;s the difference in performance gain?

the further will give better midrange power

wanna ask the sifu all here....

for simple mod like a forumer here selling in automotive garage, the Mini Turbo, i understand that it actually provides auxilary intake for the engine.... but the auxilary intake actually bypass the maf or map sensors....

all cars come from manufacturer is tuned to run richer a little bit to prolong the engine life....
thus this gadget shd cause the engine to run a little leaner than stock....

so theoretically if the air fuel mixture is slightly leaner than stock after using mini turbo, will it cause any problem?

or the AF ratio will be more perfect (close to 14:1) after using this gadget? (since stock setting is always running richer than usual)

wan to ask... drop-in or open pod filter better for an auto car?

soulfly,

does that mean if my fueling will be a lot more richer if i remove the cat?
i thought it's gonna be tad leaner due to more airflow meh?

if i am not mistaken, engine which run rich or badly tune will lead to black smoke emission.... thus the cat will actually reduce the pollution via its chemical reaction...

pls correct me if i am wrong coz i am still newbie in cars..

the CAT's purpose is to reduce emission

it does not affect fuel consumption by itself. most probably it'll be just driver's foot behaviour.

but theoretically more power = more fuel

to sifu's here..after more reading,i found myself to be more confused abt this exhaust mod thing.but the idea i have in mind is restrictive=more torque,less top speed, free flow=more top speed,less torque.is this correct?can we use this as general rule of thumb? so,does it mean removing cat con is reduce restriction thus only increase power in high rpm?

im getting even more confused when some shop i asked,if want pickup,reduce restriction,go for straight flow muffler.

It's not about the exhaust being restrictive. This is a common mistake among people, back pressure doesnt contribute into producing more torque.

Actually, smaller exhausts leads to a faster exhaust gas speed(Bernoulli principle). When the exhaust is traveling out, it leaves a pocket of vacuum behind it. This pocket of vacuum makes it easier for the next pulse of exhaust gas to go out(less restriction). But this only works if the gases are in pulses(like in lo revs). As the gas moves out in a stream(higher revs), its useless so bigger exhausts produce more power.
Just as an example, have you ever thought why exhaust pipes of a bus is small?

This post has been edited by tunertoobe: Feb 26 2007, 10:04 PM

oic..good xplanation there.so what happen when the pipe too small?there'll be even more torque then,like the case of bus exhaust.so whenever theres increment of pipe diameter,some amount of torque will disappear,or shifted to higher rpm,straight flow or s-flow doesnt matter.correct me if im wrong

I'm not sure what happens if the pipe is too small.
I'm not sure the physics behind a straight flow exhaust, but I think it's something about making sure the input and output pressure difference minimal. When the exhaust gas goes through a bend, the gases slow down and the exhaust behind it piles up, making it more restrictive.

Not sure if my explanation is accurate as I am not a tuner, need sifus to explain.