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View Full Version : RSX-S 05-06 K20Z1 into 2005 EP3



rhaile@swbell.n
08-14-2008, 12:41 PM
Anyone out there done a swap like this, I have talked to several Honda techs and they seem to think it will work without any problems. I have access to a complete 2005 RSX-S engine trans with all accys and wiring harness and ecu. I'm talking strictly drop out and drop in operation, I don't want to get into any special mods here. Or, is there a better K series engine and trans that will work on this application and yield better performance.

mustclime
08-14-2008, 12:52 PM
you are going to have to deal with the speed sensor issue....It has been covered over on k20.org.

icarus.na
08-14-2008, 02:44 PM
moonsi has a k20z1 under his hood too. might want to consult with him.

rhaile@swbell.n
08-14-2008, 02:51 PM
Is that it? what if I used a 03-04 RSX-R K20Z1

Thanks

icarus.na
08-14-2008, 03:15 PM
i'm not sure if i'm understanding you, but there is no "RSX-R"...

there's a JDM Honda Integra Type-R and we here in the states get a rebadged watered down version of it called the Acura RSX Type-S.

JDM Integra Type-R engine code: K20A

USDM 02-04 RSX-S engine code: K20A2
USDM 05-Present RSX-S engine code: K20Z1

someone correct me if i'm wrong.

icarus.na
08-14-2008, 03:18 PM
you have alot to learn...

read this:

http://www.ephatch.com/forum/showthread.php?t=43031

rhaile@swbell.n
08-19-2008, 10:58 AM
Lot to learn, yep, that's why I'm here.

Gilmour
08-19-2008, 01:00 PM
someone correct me if i'm wrong.

USDM 05-06 RSX-S engine code: K20Z1


OP read this
http://www.ephatch.com/forum/showthread.php?t=49990&highlight=speed+sensor

ep3moschini
08-19-2008, 04:39 PM
moonsi has a k20z1 under his hood too. might want to consult with him.

he has some sort of a crazy stack digital display if im not mistaken, so his wiring is probably completely different

FELON-K20
08-19-2008, 05:54 PM
I have a 05 ep3 with k20z1 i had to use the wireharness from the ep and the throttlebody dont know why but it would ideal crazy . with the trans we transfer the cases the only thing with that is that i dont have the reverse locking s

b.r.i.a.n.
08-20-2008, 08:42 AM
like others say, the only problem you'll run into is the lack of a speed sensor. you can add the sensor and the speed ring but it's easier said then done.

my friend has both parts acutally. we were going to toss a 6 speed onto his ep but the ep was wrecked before we were able to complete the project.

if using thise method, you'll also need an 02-04 rsx-s harness or you could re-use your ep3 harness if you don't mind not having the reverse lockout.

whitt
08-30-2008, 11:35 PM
I run a z1, but didn't have to switch throttle bodies? I wonder what the purpose in the switch is? Do I need to swap them? Car runs good and sgi-5 solved all trans issues. If anyone knows about the throttle body issue please let me know.

b.r.i.a.n.
08-31-2008, 06:41 PM
I run a z1, but didn't have to switch throttle bodies? I wonder what the purpose in the switch is? Do I need to swap them? Car runs good and sgi-5 solved all trans issues. If anyone knows about the throttle body issue please let me know.

the z1 throttle body is the same as the a2.

you're probably thinking about the newer k motors like the k24a2 and the k20z3 which use the dbw hence making their throttle bodies useless.

talonXracer
08-31-2008, 07:06 PM
I had thought there was some kind of an issue with the 04'-06' wire harnesses and earlier chassis.

Draw7Seven
08-31-2008, 07:53 PM
I had thought there was some kind of an issue with the 04'-06' wire harnesses and earlier chassis.

Apart from the reverse lock out?

shadowmd
09-01-2008, 07:54 AM
i kno the speed sensor on the k20az1 tranny will have some issues with an ep

D3xn2o
09-01-2008, 10:54 AM
Isn't there some kinda Signal converter box for this speed sensor issue i saw this on here some where anyone remember what im talkin about?

jalep3
09-01-2008, 12:52 PM
Here this should help

http://www.ephatch.com/forum/showthread.php?t=49990

b.r.i.a.n.
09-01-2008, 05:15 PM
I had thought there was some kind of an issue with the 04'-06' wire harnesses and earlier chassis.

yes the k20z1 05-06 wiring harness is compatible with the z1 tranny's alternative method to track the speed. but the ep3 cluster won't be able to read the high frequency signal. you can mod an s2k cluster to work with the z1 engine harness though since the s2k cluster reads off the z1 style speed sensor.


i kno the speed sensor on the k20az1 tranny will have some issues with an ep

yes it will. you can use a frequency converter to get the ep cluster to read the speed correctly or you can mod the z1 tranny by adding the 02-04 speed ring and speed sensor. if that were the case you can use the ep3 wiring harness or the rsx-s wiring harness.

the only difference amongst the wiring harnesses being the reverse lockout on the rsx-s engine harness.

whitt
09-01-2008, 06:33 PM
For everyone sketched out about the speed sensor issue, the Dakota Digital Sgi-5 works like a dream. Really everything else is easy as any other swap. Although the way they suggest to calibrate is an ass pain. The best way was to use a gear ratio calculator and then use rpm to gauge speed and adjust while driving.

I really do enjoy the swap and would hate for anyone to stay away based on little issues. I am more than happy to share or clarify any info. This board has given so much to me, and I was swapping right when the board crashed. I really was lost and realized how many damn good people we have on here (talon, jpax, sinister, musty, hell even Oce for helping me do hid the right way). Most probably don't really realize how much they do to help people they don't even really know.

donaldep3
09-04-2008, 12:24 AM
I done it. Love it, but I guess I still need a tune with the Kpro

Blue03Si
09-04-2008, 09:22 AM
Would a k20A2 tranny on a k20z1 fix the problem as well? Or would that just create a new problem...

whitt
09-04-2008, 02:43 PM
a2 trans is just fine. The gearing is different, but that can be solved as well. It is not necessary to change the gearing though. Another way is to put the z1 guts in an a2 or a3 case.

whitt
09-04-2008, 02:46 PM
I done it. Love it, but I guess I still need a tune with the Kpro

Probably not the best idea, but I can send you the tune I'm using to get you going. I'm z1, sp1576, img, dcrh w/ hfc, and 2.5 exhaust.

Blue03Si
09-04-2008, 03:32 PM
a2 trans is just fine. The gearing is different, but that can be solved as well. It is not necessary to change the gearing though. Another way is to put the z1 guts in an a2 or a3 case.

Putting the guts into your A3 case sounds like a winner to me. Also allows you to install an LSD while you are in there and replace any synchro's that are wearing.

whitt
09-04-2008, 10:16 PM
Putting the guts into your A3 case sounds like a winner to me. Also allows you to install an LSD while you are in there and replace any synchro's that are wearing.

Yep it really isn't that bad.