Honda / Acura K20a K24a Engine Forum banner
1 - 16 of 16 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
Hi, all! First off, thanks for the awesome forum! I've lurked around a bit over the last year while I've been working on my project and have found a ton of great information from this forum already. I'm at the point in my build though that I thought it wise to sign up and ask for some help from the pros.

Like the title says, and @Gerald B posted a few days ago, I have also have a bit of a unique build. I started with a 1978 Alfa Romeo Spider and have been working a K20A3 from an automatic RSX and Getrag 250 from an E46 BMW 323i into this. Here's a photo of how she started:
Wheel Automotive parking light Car Vehicle Tire


I drove and enjoyed the car with its stock 2.0 and dual carbs for quite some time but found myself constantly chasing issues on it (I know...shocker, it's an Alfa). But, as is my nature, I decided to put it under the knife. I've been documenting the build for the last couple of months on the AlfaBB forum if anyone wants to see a ton of photos.

At this time I've managed to get the engine and tranny mated up and engine bay modified to accept it. AC/PS delete with alternator relocated. KPower intake. 74mm TB. Custom header. It's not the prettiest build, but here's the ultimate goal of it; I want to get this in and running and work out the bugs on a cheap A3. Once I've had some time to shake it down I can build a proper A2 and bolt the custom bits onto it.

Motor vehicle Automotive design Automotive fuel system Automotive air manifold Automotive exterior


I pulled the engine and transmission again the other night to clean up the engine bay and get to work on mounting all of the engine's accessories and wiring. This is how she stands tonight.
Automotive tire Motor vehicle Automotive design Vehicle Engineering


I'm reaching out to see if folks can help point me in the right direction on the wiring side of things. I've done a few engine swaps in life but this is my first go at a fuel injected setup this new. I have complete engine and chassis harnesses as well as the matching ECU.

I'm not intimidated to cut into the factory harness to remove what's not needed, extend and re-route what is, and make things work as they should, but I expect there's already some good documentation out there that I may just not have found yet that can help point me down this road with some better clarity. I anticipate trouble with the lack of Honda transmission (i.e. speed indicators) and removal of evap circuit. I'd like to use the factory gear as much as possible to help keep things in budget. Any direction would be appreciated. Thanks in advance!
Art Grey Font Asphalt Road surface
 

·
Registered
97 civic HX K24a
Joined
·
1,872 Posts
Hi, all! First off, thanks for the awesome forum! I've lurked around a bit over the last year while I've been working on my project and have found a ton of great information from this forum already. I'm at the point in my build though that I thought it wise to sign up and ask for some help from the pros.

Like the title says, and @Gerald B posted a few days ago, I have also have a bit of a unique build. I started with a 1978 Alfa Romeo Spider and have been working a K20A3 from an automatic RSX and Getrag 250 from an E46 BMW 323i into this. Here's a photo of how she started:
View attachment 105495

I drove and enjoyed the car with its stock 2.0 and dual carbs for quite some time but found myself constantly chasing issues on it (I know...shocker, it's an Alfa). But, as is my nature, I decided to put it under the knife. I've been documenting the build for the last couple of months on the AlfaBB forum if anyone wants to see a ton of photos.

At this time I've managed to get the engine and tranny mated up and engine bay modified to accept it. AC/PS delete with alternator relocated. KPower intake. 74mm TB. Custom header. It's not the prettiest build, but here's the ultimate goal of it; I want to get this in and running and work out the bugs on a cheap A3. Once I've had some time to shake it down I can build a proper A2 and bolt the custom bits onto it.

View attachment 105496

I pulled the engine and transmission again the other night to clean up the engine bay and get to work on mounting all of the engine's accessories and wiring. This is how she stands tonight.
View attachment 105497

I'm reaching out to see if folks can help point me in the right direction on the wiring side of things. I've done a few engine swaps in life but this is my first go at a fuel injected setup this new. I have complete engine and chassis harnesses as well as the matching ECU.

I'm not intimidated to cut into the factory harness to remove what's not needed, extend and re-route what is, and make things work as they should, but I expect there's already some good documentation out there that I may just not have found yet that can help point me down this road with some better clarity. I anticipate trouble with the lack of Honda transmission (i.e. speed indicators) and removal of evap circuit. I'd like to use the factory gear as much as possible to help keep things in budget. Any direction would be appreciated. Thanks in advance!
View attachment 105498
Very cool looking project! What brand throttle body did you go with and are you using the k series sensors on it still? Besides figuring out the speed sensor and wiring your reverse sensor to work with the getrag possibly there should just be the one black /orange plug for evap by the throttle wiring that can be done away with , I just cut mine and covered the wires with the rest of the wrapping.
 

·
Registered
97 civic HX K24a
Joined
·
1,872 Posts
What are you doing for a fuel pump? Is the ecu KPRO or something similar ? It will want secondary o2 and a couple other annoying things if the ecu is untouched still.
 

·
Registered
Joined
·
561 Posts
getting that header built looks like it was a chore. I am really digging your build, it is awesome to see some these older Euro models getting Kseries love
 

·
Registered
Joined
·
622 Posts
Nice. My mother in law had a 1.6l on doutlet dual weber carbs. It was running well and sounded awesome.
A k20a3, a K24a(3) will suit it even better. The Alfa engine never revved that high (as in OEM tune) and the extra torque will make it a very relaxing drive.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #6 ·
Very cool looking project! What brand throttle body did you go with and are you using the k series sensors on it still? Besides figuring out the speed sensor and wiring your reverse sensor to work with the getrag possibly there should just be the one black /orange plug for evap by the throttle wiring that can be done away with , I just cut mine and covered the wires with the rest of the wrapping.
KBuilt,
Thanks! I’m just using an eBay generic TB. It’s a B-series clone though and has the B-series TPS with it.
The reverse sensor seems like an easy one to sort out. The speed sensor…not sure on that guy yet :)
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #7 ·
What are you doing for a fuel pump? Is the ecu KPRO or something similar ? It will want secondary o2 and a couple other annoying things if the ecu is untouched still.
I’m using a Jegs frame mounted fuel pump. The ECU I have is the stock from the RSX. Do you see issues with this?
Regarding the O2 sensor, I figured I’d need the primary and secondary O2 sensors and have bungs in hand to weld into my exhaust system when I build it. Am I on the right track with that move?
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #8 ·
getting that header built looks like it was a chore. I am really digging your build, it is awesome to see some these older Euro models getting Kseries love
Thanks, Them Witches!
The header was…well, it was my first shot at TIG welding. So never mind the fact that it looks like it does. That said, it was a ton of fun to build. I posted that process on the Alfa thread in my first post if you’re that interested (or bored). All said, I’m really pleased with how it came together. All of my primaries are within an inch
Wood Line Audio equipment Gas Cable









Motor vehicle Automotive fuel system Vehicle Automotive exterior Auto part



 

·
Registered
Joined
·
9 Posts
Discussion Starter · #10 ·
Nice. My mother in law had a 1.6l on doutlet dual weber carbs. It was running well and sounded awesome.
A k20a3, a K24a(3) will suit it even better. The Alfa engine never revved that high (as in OEM tune) and the extra torque will make it a very relaxing drive.
Not gonna lie, that Alfa was a ton of fun. I don’t think I’ll miss it though…except for the sound. That engine had the most beautiful tone.
 

·
Registered
97 civic HX K24a
Joined
·
1,872 Posts
KBuilt,
Thanks! I’m just using an eBay generic TB. It’s a B-series clone though and has the B-series TPS with it.
The reverse sensor seems like an easy one to sort out. The speed sensor…not sure on that guy yet :)
B series was a smart way to go , I have the same on my k24a. The B TPS is much more reliable 👍
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #12 ·
Can anyone help me ID what wires/plugs can be 86’d without causing issues when plugged into the factory ECU?
I know the K20 intake manifold, for example, has the runner bypass solenoid setup. This won’t be present in my build. Will eliminating or leaving these connectors disconnected cause issues starting and running?
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #13 ·
And here’s another question for the gurus here…I’d like to set up a temporary digital dash using a Bluetooth OBD sender and tablet. Has anyone personally done this successfully and have products they can recommend? What challenges did you hit with this setup?
 
1 - 16 of 16 Posts
Top