97 ka in 93: Intake and exhaust manifold swap makes obd2 ka->obd1

[Siizzzoooo]

I plan on swapping the intake manifolds and exhaust manifolds, and converting the ignition/distributer.

do i need to swap the head too? I heard that the S13 and S14 differ slightly, so that would be the only reason why I would ask.

Other than that, will i have any problems in order to swap over using the original S13 engine harness and ecu?

Thanks!

[:: orion ::]

Use only the '97 block/head...retain everything else from your S13.

If you want to use the dist...just rewire it, but there's realy no advantage to S14 dist over S13 dist.

- Brian

[Siizzzoooo]

yeah, I'm probably gonna use the S13 ignition.

anything else I might want to look into?

[:: orion ::]

Nope...it's a remove-and-replace deal.

Might wanna keep your cams (if you motor has the secondary butterflies on the intake mani, it has the "hotter" S13 cams.

- Brian

[Siizzzoooo]

oh yeah, btw, I'm doing a 5 spd conversion as well...

I have the 97 5 spd ecu, but an automatic S13 ecu...which should be done about that?

i was just thinking of using the s13 ecu and see what it does...

btw, will the s14 driveshaft work?
Modified by Siizzzoooo at 8:52 PM 8/16/2005

[sunnys14]

use the s13 ecu because the ecu harness from s14 and s13 are different. since you are just changing just the block and head, the ecu from a s13 would be just fine

[:: orion ::]

I have the 97 5 spd ecu, but an automatic S13 ecu...which should be done about that?

i was just thinking of using the s13 ecu and see what it does...

btw, will the s14 driveshaft work?

You have no choice but to use a S13 ECU..auto ECU will be fine, might have a CEL.

...and the S14 driveshaft is too long, sorry.

- Brian

[DjPantsSpecR]

i'm doing this same thing right now, but just to recap everything for you:ditch the 97's exhaust manifold and intake manifold, just save it somewhere, or sell ituse your 93's distributer too, so you dont have to wire up anything.use your stock harness entirely. the S13 automatic ECU will actually remove your speedcut, so its a great thing to haveThe vacuum galery on the back of the head for your secondary butterfly valves needs to be bolted on too in place on the one on the 97 head, unfortunately only one hole lines up..definately keep your cams, but maybe if you are up to it after the car runs research a swap with the cams you already have, 248/232.

[deviousKA]

An auto ecu will remove any speed cut like DjPantsSpecR mentioned, unless youd like to push 510kph, happens to me all the time <joke

The auto ecu will also give you a bit more hp in the 2000-3000 rpm range, unless you are at full load at that rpm, then it will provide same fueling as a 5spd. 1/2 to 3/4 load in that range is tuned a bit leaner in the auto, dont know why.

[Siizzzoooo]

i'm doing this same thing right now, but just to recap everything for you:ditch the 97's exhaust manifold and intake manifold, just save it somewhere, or sell ituse your 93's distributer too, so you dont have to wire up anything.use your stock harness entirely. the S13 automatic ECU will actually remove your speedcut, so its a great thing to haveThe vacuum galery on the back of the head for your secondary butterfly valves needs to be bolted on too in place on the one on the 97 head, unfortunately only one hole lines up..definately keep your cams, but maybe if you are up to it after the car runs research a swap with the cams you already have, 248/232.

awesome man!

one question...Can I not just use the S13 head w/ the 97 block and be done w/ it or will I have problems? That way, I won't have to mess with the butterfly valves not lining up right and I still retain the "hot cams".

[DjPantsSpecR]

well that seems like it would work, but to get the head off you need to remove the cams anyways, so no advantage there.

Only some things are slightly different between the two blocks, but the bottom line is if you do this you'll be replacing a headgasket. If you dont mind that i would just use the head that has the least miles or has the most work done on it.

I should have made myself more clear earlier about the butteryfly valves, or what is called the swirl control valve. I realize now i typed like an ***. There is a plate on the back of your s13 head that has a lot of hardlines on it for vacuum hoses. I refer to this as the vacuum gallery. But this plate only bolts on in one place, you might be able to drill a hole if you were worried, but i have a feeling one bolt should do just fine holding this small plate.

If you ask me i think you should retain as many s13 things as possible, but it just makes more sense to use the head and block from the s14.

You could swap all the sensors from the intake manifold into the other one and use that because it has no swirl control valve, so theoretically it should be better in the top end. This way you dont even have to worry about the vacuum gallery, however i think the swirl control valve is great and its way too much work to swap everything i need onto the other manifold to get rid of it.

The exhaust manifold doesnt even bolt up to your stock "downpipe" so its pretty useless, sell it to a S14 guy cheap.

[Siizzzoooo]

i think i understand everything you're saying...

now another thing...since I am using the 97 engine and transmission, will i have any problems using the 97 speed sensor?

My s13 has HUD, so I'm not sure if that means anything.

I think that just about answers all of my questions...lol

thanks again

[DjPantsSpecR]

um, crap, that i'm not sure about, i would swap it just to be sure, but if someone could chime in...