JTUNE - K20+K24 Engine build for Test Rabbit EP3

[dazznz]

3.5' seems mighty big to me. I would have thought that a 3' system could easily handle it. I mean if it can take the flow from high power v8's etc i don't see that a little honda motor needs a bigger one. Be interested to know the theory behind it to?

[b16a2]

haha good stuff jacky, youve made the right decision, good to see someone with the balls to actually use a big exhaust

other than i dont know where the hell anyone get 3.5" tubing from.. does it even exist in nz, let alone bends

[workhackSIR]

Waaahhhhoooo Jacky you been a busy boy! too many toys i think!

[Genkei]

theory is

trail and error

Seen a 400kw 4G63 but sounded like a normal lancer . . with a 3.5 inch exhaust
stil makes the power but very quite
This is a daily car so wanted to keep the nosie level down
( this way more cars will ask for a fight and get blown away hahaha )

The reason is going so big . . . . is tht we wanted to keep the nosie down running big mufflers so even if they flow crap with the diameter it wont make much difference

For this case or build the exhaust is only there to keep the nosie level down. The design of the extractor is similar to running open headers so the exhaust is there just to shut it up

might just buy a Buddy Club exhaust coz is cheaper but dont know how loud is gonna be . . .


No toys man ! ! ! ! doin this just for testing out wat the deal is on these K Series
If somone wants it ill sell it
You know once is done it, it wont be a ordinary EP !


Update

ECU is here now, might road tune it this weekend if i have time then next week, we give it another power run and see if we can hit 170 with the stock extractor and exhaust, lookin at last dyno run, it shouldnt be a problem

[turbozxi]

Turbo cars are much quieter you surely know this? Any bigger then 3in is definitely going to be ear plug material for the general public.

[Genkei]

yea
but not when ur running big cams and that
Guess u might to hear it with a normal exhuast compare to that

Try a BuddyClub Spec 3 or 4 Exhaust is just a loud as a the Spec2 ( stright pipe )

Hard to explain my point but i guess ill just try it
Going to make two set anyway try 3 and a 3.5 inch

Most will think it sound crazy ( same here . . . ) well it is ! butS . . . after doin some testing and comparsions,i kinda changed my mind

If u think the back pressure can be alter by the exhaust lenght
Then think again on the Drag cars . . .
As long as you get the back pressure right at the collector of the extractor and where it goes out, it will be just a fine
( mega phone Desgin )

Think even Gary will agrees with me

On Pipin size

The biggest you can get is 5inch but they only hav it in 90 and stright, no donut

[tcuf]

My Ep3 has a 3 inch. Bolt on 5ziggen. No noise at all.

[Genkei]

should just keep it and we ll drop a 24a in !

[tcuf]

Have been thinking about it.

[mr_tec]

any updates?

[Genkei]

kinda of . .

Makin few headers and a exhaust atm
and retune

also throttle body upgrade

Before all the Extractor and exhaust and throttle body upgrade
We tuned again just as a base mark and is makin abit more power then the k20ecu ! ( no numbers yet )

So is any number from here on

Ill leave the progress and update after the track day

[Lith]

Originally Posted by b16a2

haha good stuff jacky, youve made the right decision, good to see someone with the balls to actually use a big exhaust

That was people going to 3" exhaust, once upon a time anything over 2.25" exhaust was considered excessive for an NA 4 cylinder. 3.5" is rather excessive I reckon, but if you have the resources then I guess not a problem - am interested to find out how it comes out sounding.

[Coupe-R]

heck my 1600cc DA6 came with a 2.5" system from japan and it was dam quick!
Seemed to suit the 1600cc well.
I gained 13kw in back to back tests from going crush bent 2.25 to mandrel 2.5" on a B18CR. Better designed system and more flow.
Exhaust and header design is important, not so much overall size. Been discussed heaps on here tho.

Looking forward to seeing the car in two weeks jacky

[Genkei]

hopefully it comes back this week so i might have time to get it ready for the track day or ill just race something else ( E46 328i . . . . )

[americ_ian]

^^ put it back together! CHOP CHOP!!!

[Stubs]

Are guys fabricating your own extractors?

I think it will be pretty interesting to see what sort of power increase they make. I know DTR/SSR Headers make pretty good power but at $1200USD + shipping to NZ (huge package size FT It's a pretty expensive way to do things.

It would be interesting to compare a set of DTR/SSR headers to a set of custom built headers from a good NZ fabricatior.

Are you Going 4 - 1?

It's really interesting to hear how the 3" inch exhaust can be built to be quiet I always assumed a 3" or bigger system would sound shithouse on a honda. Do you think you will still get decent flow with the 3.5"?

[Genkei]

yea
designed own extractor

Its a 4 2 1 design, coz this k24 is not designed to pull big rev
max rev at 8000 rpm ( on the dyno we have rev it to 8500 rpm ) but for it to last around the track and forever! 8 will be the max

We are doing somethine tricky to the extractor and making it peak early as possible ...
Vtec is at 3200 rpm before all these mods was done for the best power
So it wil be even earlier after the new extractor and exhaust is fitted

Also got some Jtune Custom Cam designing soon..
BUT
We wanna see how much power we can get out of it first

The cams will be made for mild k24 setup and works fine for stock k24 valvetrain if possible

have to say the Mid range power is abit weak for wat it is, the torque and power ratio is Torque > Power in the mid range, good for hill climb i guess

[Stubs]

Originally Posted by Genkei

yea
designed own extractor

Its a 4 2 1 design, coz this k24 is not designed to pull big rev
max rev at 8000 rpm ( on the dyno we have rev it to 8500 rpm ) but for it to last around the track and forever! 8 will be the max

Do you not trust the S2000 oil pump upgrade?

According to ERL its rated to 11,000rpm, but obviously revving it that high all the time would increase the risk of going boom lol. I would have thought 9000rpm would have been safe though.

Is it just because you guys want to make super sure the engine stays alive?

[Genkei]

the std rods and bolt and pistom wont like it ....

8000 can go for ever
8200+ is takin risk
8500+ high risk

[Stubs]

Originally Posted by Genkei

the std rods and bolt and pistom wont like it ....

Thats a pretty good reason right there lol

[BLAZED_RACER]

3inch on K20 sounds fine;

be interesting to see your header Jacky, I know my Ep3 is screaming out for a header haha

[americ_ian]

low vtec point?
is the low cam lobes really peak at 3k???

[Coupe-R]

i-vtec ian, cam timing changes everything

[americ_ian]

hmmm.. i remember talking to gary about why they set vtec points so low in k20, k24 builds

he said those people are pretty much noobs arnt arnt tuning it right...

[Coupe-R]

hehe, I wouldn't know personally, never tuned Kpro.
Ask Jacky