Any problem is get it tuned to RON 95, any long term issues to the engine??
Coz' I've to run on RON97 also and cannot tahan liaoowww...

ermmm... Coz my compression ratio is 11.8 and there insufficient flow in my exhaust. At least that's what JC Racing and also my engine builder told me.

Also when on Ron 95. There's a funny bubbling sound coming from my exhaust that's not there when I'm running RON 97. Not sure how to describe the sound, maybe correct term is backfire.

K20A ported and polished intake and exhaust. Exhaust is 4-2-1 (1.8 inch)
running with E-manage Ultimate and V-manage (ECU not compatible with Hondata)

K20A type R.... coz' the ECU is not from a type-R that's why not compatible with any Hondata stuff, including K-pro. I wish there was a way to make it compatible without changing the ECU, re-wiring, etc... but oh well.... can't undo past mistake without spending a bomb..

yup, my tuner recommended 2.5" also....

Should I go for S-flow or straight flow??

Yep... Engine kosong

Anybody know what's the stock DC5 throttle body bore size??

Searched on other forums some say 62, done 64 and some at 67mm... Dunno which one correct answer.

This post has been edited by unitron: Jun 25 2012, 04:52 PM

Anyone with the info.. Planning to change, just wanted to make sure is it worth it.

Thanks for the info, mine currently stock already 64mm, so no point going for DC5 ones.. unless there is room to bore it bigger... hmmm ??

S90 i think smallest is 70mm... my tuner told me too big.... he suggest 67mm only.

Anybody know what it takes to get a DC5 exhaust manifold into an ES chassis?

Don't want to have to custom made a brand new exhaust to fit my K20A. I heard a DC5 exhaust manifold will fit with some changes. Anybody have experience or have friends with experience on this?

never mind, you can help ask the next time you are there.

mebbe the wires got loose during the high speed car chase scene over our bumpy roads...

I'm on K-series...

But of course there is more B-series around due to it's lower cost and it's been around far longer.
Plue more mech/engine builder familiar with B-series compared to K-series.

Where is F-tuned racing located? I'm interested in some DC5 stuff they have lying around or so my friend told me.
I googled it and it suppose to be in Jln Ulu Kelang, but my friend said it's in Sunway...

mADmAN... any luck in asking ur mechanic friend on wat it takes to get a DC5 exhaust manifold into an ES ?

Also to other sifus out there... any of u experience / heard other peopl experience engine knocking or pinging due to too restrictive exhaust ?

Not anything definitive, lots of speculation mostly... Most info are from the US which have different version of the Civic.

I looking for info from more believable source, since dunwan waste money if it's not possible or need lots of modification to get it to fit. My own mechanic said only need to change the front ARB to DC5 if wanna use DC5 exhaust manifold, but several time already the case is he made some wrong assumption which cost me more $$$


hmmm... poor fitment, that's a new idea that was not considered, but dunno how to check when the car is running. Anyway the sound only can be heard at between 2500 -3000 RPM when cruising or when accelerating under heavier load (i.e uphill). Also intermittently, not all the time. Sometimes very faint, sometime slightly loud.

Did valve clearance check/adjust 3 times but problem still there, become worse when the valve tolerance is very tight (below spec limit).

Thanks.. will try test fit DC5 one if the modification to be done to my existing one this coming Friday at SuperCircuit cannot work.

One #$&&*@#$ Kembara hit my rear bumper this morning on the way to work. Just got it re-painted less than one month ago.

Actually, was just repaired from another accident way back >4 months ago. Didn't bother about it until just a couple of weeks back when at the same time doing some other repairs decided to get it done also.

Then the jinx of newly painted bumpers come... seem to always happen after u just repaired or re-paint it.

Everything in Sunway area is expensive...