Ecu - is it possible

[teddy]

Is it possible to run a ca on an sr20 ecu? No, I'm not thinking about trying it, but this is why.

I was working on getting my emanage hooked up earlier tonight and was reading the ecu/harness pinouts that I had printed off. The ecu pins on the sheets do not match my ecu plug at all. Now I had noticed this before, but never even took a 2nd thought about it, but I have a jumper harness of sorts hooked to my ecu. Like, I have the actual ca18det ecu plug, but then there is a jumper harness inbetween hooking into the ecu. The wires are like wax molded into the ca18 ecu plug, the wires then criss cross all over the place to different pins, then has a normal ecu plug going to the ecu. But the pinouts on my ecu looks almost identical to various sr20 ecu's, or at least the same configurations(my ecu is unmarked).

I don't have any pictures right now, but was hoping someone might know something about this? I have run the car for a short time like this and it seemed to run fine. Any ideas guys?

[f s t caz]

yes, it is possible. i remember reading a few posts on it here there and a few other places. the yay factor was the 32-bit instead of the 16-bit, but i couldn't find any info in searching. so short answer: yes.

however, i don't think it's a straight swap. I'm fairly certain that there's some splicing involved.

[silvia_ca18det]

yes it is possible, u can use the s13 sr20det powerFC aswell since they dont make the ca one anymore! u need to re-pin the ca18 harness to the SR plug!

[biosehnsucht]

actually its 16 bit (SR) vs 8 bit (CA) IIRC.

anyhow, its doable, a major PITA unless you have lots of SR bits laying around already and not the proper CA ones. Someone has in the past suggested that the S14 SR ECU was a direct physical plug in to the CA (S13 SR and CA aren't), and other than reprogramming the ECU for different fuel/etc data you just have to repin some of the pins (not that hard once you figure out how to disassemble the connector w/o breaking it) to put things where they go on the S14 SR.

One might even be able to keep the variable intake working by programming the function of the S14 variable cam gizmo to replace it, but I don't know jack about SRs so I don't know for sure..

[teddy]

well i mean, the actual plug thats going into the ecu is physically different in size and number of pins compared to the ca18 plug. And for those of you who didnt read the whole post , my harness already has a jumper of sorts that has everything repinned. My real question was basically that is it safe to run the car on the sr20 ecu that is already hooked up on mine(assuming that it is some kind of sr20 ecu)?

[biosehnsucht]

if its tuned for a CA, and the harness is done right, sure

hard to know from here tho if it is

[datsunboy]

One might even be able to keep the variable intake working by programming the function of the S14 variable cam gizmo to replace it.

so your saying that with the CA...the variable intake IS controlled by the ECU?I have seen a map for it in ROMeditor......but the wire that comes from the ECU to supposedly controll it goes nowhere on my engine.and the Vacume for the valve goes straight to the back of the intake.

I know there has been discussion before about hooking it up properly to a delay valve and vacume canister of some sort to make it work properly.....but havent heard anyone talking about the ECU controlling it before???

cheersand sorry to hijack the thread...lol

[biosehnsucht]

the wiring doesn't show in our english language EDM FSMs as the EDM motors never had the variable intake.

when correctly connected, the ECU turns a solenoid on and off. this solenoid either connects the intake actuator to vacuum via some check and delay valves and a vacuum tank, which ends up connected to the back of the intake manifold where the FPR goes, this pulls the secondary intake butterflies closed; OR it vents the intake atmosphere through the other connection on the solenoid, this is normally connected via the tube onthe back of the motor that goes around past the turbo and into the inlet pipe after the MAF, right next to the breather hose, this makes sure there is only metered, filtered air in the system at all times no matter what.

I really need to revamp a guide on how to hook this up, I had a post in the old FAQ thread but it wasn't easily followed.

ghetto method is just connect the butterfly actuator to the intake manifold, it'll operate just not optimally.

the ECU maps I am pretty sure aren't controlling any variable opening, but are on or off and the maps set the threshold of airflow somehow.

[datsunboy]

so it's not really worth the bother if you havent got a spare solenoid, check valve, or canister?

I might have a solenoid or 2.....but no such canisters.....I threw them all away cause I thought they were emissions crap which we dont need in NZ

[biosehnsucht]

well, compared to not having it at all, yes, if you just T it to the FPR it'll work alright, not optimal but ok.. worth it at this point becomes more vague. to me its worth it, I like having everything working just as it should within reason.

[datsunboy]

alright.We'll Im happy with its performance for now...so I'll just re-hook it up straight to the plenum and leave it.

but my car does have sweet **** all off boost power. And my boost doesnt hit properly till just over 4000rpm.