A/C after SR-swap

[xterral]

After doing some extensive reasearch on the topic, I believe I've come across a practical solution. If you want to have A/C in your SR-swapped 240, you have two main choices: use SR A/C compressor or use KA A/C compressor...

cons of using SR compressor

existing system needs to be evacuated
custom lines need to be fabricated
system needs to be recharged with refrigerant
replacement SR compressor not available domestically
requires rewiring


cons of using KA compressor

fitment KA compressor onto SR bracket isn't the best
clutch/pulley of compressor does not line up with crank and idler pulley
requires rewiring


pros of using KA compressor

existing A/C system doesn't need to be touched
A/C works like stock with all stock components and nothing more
simplifies your SR swap


I've decided that using the KA compressor is the most practical method. GSRACER previously posted that wiring the A/C to work (one of the more common swaps, S13SR into S14) required connecting Yellow/Black to Black/Pink on the KA's F3 plug. That takes care of wiring, this only leaves physical fitment of the KA compressor onto the SR block...

http://www.sbbent.com/forum3/uploads/post-2-1090597714.jpg

My RWD SR20DE A/C bracket allows all 4 compressor bolts to be utilized, and all other's brackets only allow the use of 2 bolts. Either bracket, the pulley is still misaligned by a few mm, or the pully isn't angled perfectly.

GSRACER modified the KA compressor and is using a VG-compressor clutch/pulley. This is one solution. 2nd solution is One Ton Garage's aluminum adapter brackets which bolt onto the SR bracket and adapts it for use with the KA compressor. It's the cleanest adaptation that I've seen so far. 3rd solution is a replacement bracket. I want to get a machined aluminum part made off the OEM DE bracket:

http://www.sbbent.com/forum3/uploads/post-2-1090597856.jpg

I've been talking to a well known machining company and a well known vendor about getting a replacement aluminum bracket with the correct bolt offsets made for me and my car. For the benefit of others, it will incorporate additional bolt holes for all variations of KA compressors (S13 and S14 generations covered) to make it a universal bracket.

I'm posting this because I want to gauge interest in a bolt-on bracket to correctly adapt the existing KA compressor from both S13 and S14 to the SR20. Minimum run is 25 pieces, and the cost on the piece would be in the ballpark of $150 (roughly 1/2 the cost of using the SR compressor). It's going to be lightweight, bolt-on, and universal.

By the way, this isn't a commercial post. I'm getting one made regardless, and I was checking to see if anyone else wanted to benefit from my research and development. Also, getting 25 of them made will definitely be cheaper than getting a one-off. Anyone interested?

[xterral]

no one here wants AC after swapping in their SR? bump!

[1121S13]

no one here wants AC after swapping in their SR? bump!
thx for info.
great pics.

[TheTimanator]

When you say KA compressor, you mean KA24DE, right? I was pretty sure the E and DE compressor's are slighty different.

I used the SR compressor, had custom lines made, and rewired it. But for some reason it doesn't idle right. I've read there is susposed to be a FICD (fast idle control device) for our a/c systems, but mine is nowhere to be found, and neither is the plug/wiring for it. Any ideas?

btw
.....would be in the ballpark of $150 (roughly 1/2 the cost of using the SR compressor).
where do you figure this from? If your car is running R134a than it could cost less than $150 for custom lines and a recharge (do the wiring yourself). Although, if the a/c was working in the car before the swap, a braket would be the easier (and less time consuming) way to do it.

[HaLo]

I ditched the whole A/C system... it's unneeded extra weight. ;)

[xterral]

When you say KA compressor, you mean KA24DE, right? I was pretty sure the E and DE compressor's are slighty different.

I am expecting the bracket to support mounting for all variations of KA compressors, with threaded holes where they need to be.

where do you figure this from? If your car is running R134a than it could cost less than $150 for custom lines and a recharge (do the wiring yourself). Although, if the a/c was working in the car before the swap, a braket would be the easier (and less time consuming) way to do it.

You're lucky if you paid less than $150 for custom lines and recharging. Here in Houston, TX, that sort of stuff is deluxe. For the person who wanted to simply swap in the SR20 motor while keeping the A/C intact, the custom bracket will make things 10x easier.

I ditched the whole A/C system... it's unneeded extra weight. ;)

Hehe, I see your point. That's why I kind of overbuilt my SR20 so I could enjoy the comforts of A/C and power steering :loco: I know, call me crazy!

[HaLo]

Hehe, I see your point. That's why I kind of overbuilt my SR20 so I could enjoy the comforts of A/C and power steering :loco: I know, call me crazy!

not really... if you live in an area that hot and has lots of traffic jams, I can understand. ;)

[xterral]

not really... if you live in an area that hot and has lots of traffic jams, I can understand. ;)

<-- Houston, TX ... it's not just the heat and the traffic, it's the humidity and Houston's ability to start raining without warning.

[Duwey]

Does the bracket include having threaded holes for the sohc compressor? Now that is universal.

[xterral]

Does the bracket include having threaded holes for the sohc compressor? Now that is universal.

Yes, it will have threaded holes for all 240SX compressors

[Duwey]

Where do i sign up? Where are you located in Houston? My girlfriend is interning there for the summer. New messages doesn't update me at my email so if you can email me at [email protected] on any updates, then that would be great. Thanks.

[Duwey]

Any update on this bracket? I'm down with it. If not, then i'll have to make my own soon.

[wylin]

pro's SR compressor:

- cool better then KA compressor, sit it my s14 and you'll know what i mean when the AC starts working in 60 seconds and is ice cold.

[Fibercus]

<--- 120 Seconds - Ice cold. S14 sr / KA comp.

Either way I would still probably prefer SR compressor, but ka will do for now. Wylin is right on that one

[NismoRacer1]

I found what I think is the right wires, at least they are the right color. But i dont have the correct pin diagram with that connector and I dont want to just connect two random wires together than happened to be the same colors as mention. Has anyone had success with this or does anyone have a diagram of the pins and know that they are the right wires. Thanks

[1121S13]

I found what I think is the right wires, at least they are the right color. But i dont have the correct pin diagram with that connector and I dont want to just connect two random wires together than happened to be the same colors as mention. Has anyone had success with this or does anyone have a diagram of the pins and know that they are the right wires. Thanks
from the dead.

[SOUTHSTAR]

! HOW TO USE KA24DE A/C SYSTEM WITHOUT ANYTHING CUSTOM !
Make shure you read this al the way through before trying it because there is an important note at the end.

A little info for those trying to have a/c on the old sr, stay with the ka compressor if you had an ka24de.

Also be aware that tere are 2 types of compressors for the ka24de Both are factory and have the calsonic label on them. One of them has the smaller of the 2 clutches and it the clutch is black. This one bolts upto the sr braket with all 4 bolts BUT the pulley does not line up perfectly as was previously mentioned.YOU DO NOT NEED ANY CUSTOM BRAKET TO SOLVE THIS PROBLEM ! I have come up with a much easier solution to this problem. That is to use a diffirent belt. The stock belt is a 4 ribbed belt. What i did was i went to NAPA and got a 3 ribbed belt with the same lenght Part NO. 25-030350. What you do is you puth the belt on the inside of the crank pulley and then let it ride on the outside of the a/c compressor pulley. I ran it like this for a while with no problems Then i screwed up the compressor (dont ask) and now i went to a different compressor just because i found it at the junkyard cheap.

The other type of compressor that comes with the ka24de has a big gold color clutch and will only line up 2 bolts. This one lines up perfectly with the other pulley and can use stock a/c belt. I have had this setup about a month now with no problems as of yet.

(!IMPORTANT! remove the center bolt from the SR compressor braket or else it will puncture the side of the ka compressor when you tighten it down,dont ask how i know)

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[QUOTE=TheTimanator]------When you say KA compressor, you mean KA24DE, right? I was pretty sure the E and DE compressor's are slighty different.

I used the SR compressor, had custom lines made, and rewired it. But for some reason it doesn't idle right. I've read there is susposed to be a FICD (fast idle control device) for our a/c systems, but mine is nowhere to be found, and neither is the plug/wiring for it. Any ideas?-----------

I also got a/c to work on my sr and i also have the low idle problem. The engine idle is supposed to bump up when the compressor goes on so it can handle the extra load. It used to do this when it was ka24de. I would love if someone could help out on this one.

[lilpiton]

wow this is some great info. will be needing this very soon. i love but hate hot weather lol

[mewantkouki]

Holy fucking 7 year old post dude...