Furious Styles

Considering the Ep3 as the next purchase (currently have 92 si), whay kind of power numbers does the stock engine have? and what are you looking to accomplish with this swap?

jdmallday1090

stock engine has 160, k20a2 has about 200. the k20a3 (stock ep3 motor) has no potential and is pretty pointless to do anything with besides get good gas mileage and its eco friendly. you can make good numbers on a stock a2 also and its a simple swap

WhiteOnRice

Ehh, the k20a3 has a lot of boost potential.

reaction360

I did this swap for a friend. 03 ep3 and I used the k20a2 engine harness. I ran into 2 small issues that I havne't seen covered anywhere unless i missed it.

1. the AC no longer works, is there a difference in wiring pin outs on the ecu?

2. water temp on the gauge cluster no longer works either. do I need to add a sensor on the radiator hose?

thanks.

Little_Nolan

iTrader: (3)

You can keep the 5spd. and not fiddle with the 6spd. right?

ktmryan53

i assume this is similar for a k20a3 swap, correct?

hondaek91998

I got a k20a3 and I just bought a k24a1 is that good for a swap or to do a frankinstan

poeticfinesse21

if i buy a k20a2 swap that includes the original key and cylinder, will i be able to start the car without a reflash?

4LokoEK

good info here.

jdmkidb17a

can u use a RSX ECU on a stock EP3 ?????

WhiteOnRice

I wouldn't change your car to the key original to the k20a2; use your car's original and get Honda/Acura to work with your immobilizer. If you are talking about a non k series native car, I can't help you there; you probably must use Kpro.

Yes but I'd expect to fall out of Vtec when shifting.

addicted2jdm

so i was wondering what all is needed to put a k24 into my ep cause i am at a stand still with performance parts dont want to spend useless money on things i do not need so if anyone could help that would be great, and sorry if this has already been answered

Sleepek24

If i wanted to put a k20a2 into a base model rsx(k20a3) do i need the k20a2 harness or can i use the a3 harness and will the a3 harness plug into the a2 ecu?

Leaving the 5 speed tranny for now.

I just want to swap the motor so im thinking i just need the motor and ecu, am i missing anything?

Little Aaron

good info, very helpful for people doing their first swap!

amnbassist

So I can use the ep3 ecu just get it rekeyed at Honda right?

Turpid Porpoise

no you use your ep3 ecu to get it to a dealer then you have them rekey the RSX ecu to work with your factory key and immobilizer.

I don't understand why you guys don't just do an A2 head swap with some high compression pistons.

amnbassist

Can I swap the longblocks no problem? Also I deleted my ac in my ep3 so will I run into any issues?

LimitedSC2k1

Nice write up. So you had no problem pulling the engine the the transmission attached and everything, very cool. I think if you swapped the crank pulley from the a3 to the a2 you wouldn't have the belt at the edge of the specs... maybe someone else can confirm this?

WhiteOnRice

Good thought but I'd rather use the belt at the edge of spec (worked fine for me for 10,000s of miles) than do a crack pulley crank swap and try selling the a3.

edsyks

I'm looking to buy a new EP3 motor any good suggestions on where to look?

EP3_Hatch

Can someone tell me what is needed to do the K20a2 cam swap into a 2002 Honda Civic Si with the K20a3?

WhiteOnRice

I'd buy private (on here, ephatch, craigslist, local auction, etc.) but it sounds like a good time for a swap. :D

Ville256

Why was he not answered? ....... You cant keep P/s? Did your a/c work after the swap. "plug and play"?

gangstakid27

Wish I had enough money for a swap lol but maybe one day......

gangstakid27

This is very true. The stock motor can easily get to the k20a2 but well if you have the time and money than I guess you can go for the k20a2 but thats alot of money for sligthly faster engine. Don't they range from like 4500-6000k?