a3 vtec killer setup help!

[R34L-St4tus]

i've been doing some searching, but still kinda confuse. i was just wondering what i needa get for this setup to be done to my a3. i've got the supporting mod already. so what i need now? a2 cams and rocker? ??? also is there any diy on here, that'll be most helpful! thanks.

[talonXracer]

You need A2 cam's but you will use A3 exhaust rockers on both the intake and exhaust. And you will need Kpro.

[EP3Casas]

You need A2 cam's but you will use A3 exhaust rockers on both the intake and exhaust. And you will need Kpro.

so you need an extra set of exhaust rockers cams and kpro?

[talonXracer]

That is the minimum required for a vtec killer setup into the A3(dont forget typeS inectors)

[AUTiger]

I would use a2 valvesprings and retainers, but others have been fine without them. Which makes me wonder if stage II cams for the a3 really require upgraded valvetrain since they are less aggressive than type-s cams. I already have z3 springs and retainers with my stage II's, but I want to swap an a4 or a1 and if I go a4 I don't want the hassle of removing my valvetrain and swapping it on the a4. If I get an a1 then I will just swap my a1 head on and sell the spare.

[EP3Casas]

well i just got a great deal on a2 springs and retainers. so this would b a recommended list?:

a2 cams, springs and retainers
an extra set of a3/a1 exhaust rockers
a2 injectors(lowest cc you can go)
K-Pro

thats pretty much what is required in a nut shell?

[R34L-St4tus]

I have kpro, so let's get this straight I just need a2 cams and a3 rockers on both side? Plus type s injectors? Doesn't the a2 cams needa be used for it to fit? Would I need to upgrade the valvesprings and retainers?

[EP3Casas]

I have kpro, so let's get this straight I just need a2 cams and a3 rockers on both side? Plus type s injectors? Doesn't the a2 cams needa be used for it to fit? Would I need to upgrade the valvesprings and retainers?

u need a2 cams an extra set of exhaust rockers from an a1/a3, and it sounds like the a2 springs and retainers are recommended so i got some as well. a2 injectors as well 310 cc.

[Onasty]

i dont have a2 injectors??

[EP3Casas]

really? so u were on stock 270's?

[Onasty]

i still am

[EP3Casas]

o wow and no issues?

[goldEp]

has anybody found a good diy im getting ready to do this..im worried about timing.first time..
and how does ignition timing work on k-series..?
ive heard 270 injectors are fine..and ive heard adjust kpro to vtec hight then rev.oil pressure not needed for this vtec..

[EP3Casas]

has anybody found a good diy im getting ready to do this..im worried about timing.first time..
and how does ignition timing work on k-series..?
ive heard 270 injectors are fine..and ive heard adjust kpro to vtec hight then rev.oil pressure not needed for this vtec..

its a timing chain just line up the lines.

[Heitzke]

i dont have a2 injectors??

What's your duty cycle on those injectors? I maxed out my 310's a few times while tuning. At WOT @ redline i'm still getting pretty high duty cycles..

[Onasty]

What's your duty cycle on those injectors? I maxed out my 310's a few times while tuning. At WOT @ redline i'm still getting pretty high duty cycles..

i have no clue ill do a log a WOT run tomorrow. I kno i didnt max out during the tune session.

[Heitzke]

i have no clue ill do a log a WOT run tomorrow. I kno i didnt max out during the tune session.

Also helps that you're still on the A3 block, but still. You must be getting somewhat close to maxing them.

[AUTiger]

you have to be close to maxing them. I am only at 180hp and my duty cycle with the 310's was 75% at 7.5k rpms. I am thinking you are in the mid to low 90's

[R34L-St4tus]

u need a2 cams an extra set of exhaust rockers from an a1/a3, and it sounds like the a2 springs and retainers are recommended so i got some as well. a2 injectors as well 310 cc.

Okay, would i need to get new or used a2 cams? Is there a diy on here? And on kpro what would i need to change?

[Heitzke]

Okay, would i need to get new or used a2 cams? Is there a diy on here? And on kpro what would i need to change?

No need for new cams, unnecessary. There is no DIY on here, but a good running thread of information on k20a.org. On Kpro... you just need to get it tuned.

[EP3Casas]

are the pulse plates on the cams the same between the a2 and a3?

[Onasty]

you have to be close to maxing them. I am only at 180hp and my duty cycle with the 310's was 75% at 7.5k rpms. I am thinking you are in the mid to low 90's

low 90's but not maxin out yet

[Canuck Civic]

are the pulse plates on the cams the same between the a2 and a3?

Yes they are the same so are the cam gears

[EP3Casas]

would u guys also recommend that i replace the timing chain as well? or could i run my stocker? i have about 70k on it.

[Canuck Civic]

If your planning on taking off the timing chain cover to swap the cams, then yes I would change out the tensioner and chain but that's just me.

[Onasty]

I think i am maxing out the 270's. Neone what to chime in

[AUTiger]

post your calibration, you are running RICH. That and don't datalog in 1st gear, if you aren't comfortable with a 3rd gear pull to 8k then do a 2nd gear. Unless you disabled it, looks like your o2 is shot and you are dumping fuel

[Onasty]

o2 isnt shot its disabled n i am runnin rich thats how my tuner tuned me n disabled the o2 to get it to run correctly

[AUTiger]

well you're at 10.70a/f which means it is running so rich it can't read that low. If you were running mid to high 12 a/f you might not be maxed out, but that is dumping fuel like crazy. Toss some 310's in and retune.

[Onasty]

would 310s dump even more fuel

[AUTiger]

Well first you need to find out why it is dumping all that fuel. Then you can do a datalog to actually determine a legitimate duty cycle. Right now you are maxed out by 7k because you are running approximately 17-20% too rich.

[Canuck Civic]

Post your datalog. Why is your o2 sensor shut off isn't your fuel economy the shits.

[NGS]

i have 2 questions :D

1....Where can i buy the a3 exhaust rockers?
2....would it work with the ep3 ecu?

[jh604]

i have 2 questions :D

1....Where can i buy the a3 exhaust rockers?
2....would it work with the ep3 ecu?

1. Any honda dealership. CRSX?
2. You need kpro, so any base ecu will do as long as its kpro-ed

[R34L-St4tus]

okay, update. well i got all the parts to do this setup but now i can't seem to find a shop here that knows how to work on k-series? is this hard to do it yourself? any help would b great, i plan on doing this as soon as possible. i've had experience working on d and b series, but i don't know if its anything close to a k-series. also something about the timing chain?

[Onasty]

farely easy just torque everything to specs cant go wrong