Lolx... Our dohc is 4G91?

not just say. it's totally cannot. that DOHC head is terbalik one.

Depends on what cams are fitted. I think you means rough idling with very high cams, not engine not stable.....

Previously having O2 problem with check engine light on but since the change. The light haven't come out for sometime already and will keep on testing just to be sure.

1.7" piping is enough for N/A engine at 1.5 & 1.6 not need to go until 2.0" that is what the exhaust shop owner tell me.

Anything above 1.7" is for cars like 1.8 and above. And max for N/A engine is 2.0".

Unsure about this fact as i got it from that owner.

Any cams can you suggest for good idling(almost same as original) ?

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Added on December 11, 2011, 12:44 amI am using K&N filter now but it's the original size for my engine. If I change it into K&N mushroom filter, will there any different?

This post has been edited by Jajay Chong Hon Keat: Dec 11 2011, 12:44 AM

I think quite accurate as my 2.0 turbo only using 2.5"

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Added on December 11, 2011, 10:49 amI think bro. low yat 82 can advise you better on this, but basically older days we call them 1/4, 1/2, 3/4 and full cams.
The higher the cam the rougher the idling but power gain is much better in the high end but poor in the lower end.
Lower cam have better idling and good lower end but high end gain is less, so you have to choose properly.

For mushroom type or open pod, best is couple with Cold Air Intake (CAI)

This post has been edited by vr2turbo: Dec 11 2011, 10:49 AM

i disagree with it...piping size doesnt always relate to CC...its more on the amount of power u have and where in the rev ranger is that power at.

take for example 1.6...campros and CPS goes up to 2.0 and the gain is pretty decent... even CPS stock piping size is 2.0....go bigger and kaput...

but when it comes to the 1.6 MIVECs and VTECs...although the 2" pipes is pretty decent for those engines but they benefit more with 2.3" especially since most of the peak power is at the higher end of the rev range and the bigger pipe size really benefits the higher rev range.

my 2.0 VTEC is running 2.5" pipes.. and its good...so good.. 4-1, 2.5" pipe, 1 midbox, no muffler.

i also have an exhaust cut out valve.. so when the valve closed the exhaust is forced from a 2.5" pipe into a 2.3" pipe and s-flow muffler.....i lose 15hp about 1.2kg torque. tested this on the dyno just yesterday

so max n/a is 2.0"??? big big no.

So what did you get at yesterday's dyno tune?

In this case, how do I improve back my low end? add mid box?

current set-up, 4-2-1 , 2 small bullet + s flow muffler. running on 2.0" piping.

lol... any cams wit 270+- duration or lower is OK..provided d lift is not to aggressive... works enginerrin / powerzone cam looks fine. jasma cam if u r on tight budget...

but d rough idle is vry adrenaline pumpin... huhu

https://www.youtube.com/watch?v=pb4e5jYZDdM&feature=related

agree... d pipe sizin is really depends on d engine characteristics n also d driver's handling d fuel pedal. there r act a bunch of software to calculate d piping size for certain rpm one's r aimin accordin to inlet valve, outlet, bore, stroke, cam duration n lift yadyadyadya..

but for rough guidance, 2.0" is still d magic number where alot tuner / guides use as threshold..lol

2 mufflin is enough at middle. 3 r too much...lol.. like i said, d cheapest way is change d piping size.. rm150+- settle..lol

blocked type muffler



3 Exss Work mid boxes

wah, 3 midbox including the muffler will be 4 boxes....

yerp..top speed 265km/h on this waja mivec

Actually what is the function of midbox?

as resonator & exhaust gas accumulator/collector..i guess

What engine?
4G63T normally only can that speed~

not quite familiar with mitsu engine..

it's mivec 1.6 tiptronic

To be able to hit 265km/h in a 1.6 MIVEC triptonic somemore in a heavy Waja chassis, that MIVEC sure have a lot of firepower in it, my friend's Satria MIVEC manual with 152whp also struggling to go higher than 245km/h already.....

Is it really useful to put so many midbox? Sampai 3 midbox ???

owner claimed with 2 mid box top speed 245km/h, with 3 mid box up to 265km/h