Doing some research. Looking for constructive criticism.

[PMan_S13]

Ok. I'm just looking at what I'm getting involved in here. If you have any opinions or ideas please pass them on.

Here's the deal. I have, or had, a '91 240sx. Bored over, rebuilt with forged internals, turbocharged, added coilovers, stereo, blah, blah.. made it the car I wanted. Well a few weeks ago I got run off the road and the car is completely destroyed. But my built motor survived. So now I am searching for a new home for it.

At the moment I am looking at getting an s14. I loved my hatch, but it is getting difficult to find an s13 that is not needing some work. And I already have a lot of work ahead of me, just to get another 240 back up to standards. Plus I like s14s and everyone here has my beloved s13 hatch.

So I'm just researching some stuff to see what possible problems I may encounter.

-I want 5 speed. But I am willing to buy an auto and swap it when I pull the motor. Will my 5spd s13 ecu work in the harness for an auto s14 ecu? obd2 didn't start till 96, so I would imagine the 95's (which are actually built in 94) would be obd1, correct? My intake manifold got smashed in the wreck, so I will be using the intake manifold off whatever car I get.

-Ok, at the moment I am planning on using my 5 speed transmission. Now I have heard that the distance from transmission to differential is longer in the s14s. Which means my driveshaft wouldn't line up. You can have a driveshaft built down in Circleville for 75 bucks. Either that or I could find a driveshaft at the junkyard. Of course if I buy a car with 5 speed this is all besides the irrelevant.

-I would like to use my vlsd from my s13. Any problems I might encounter trying to put that baby in there? I don't know if nissan changed the halfshafts or something between models. Doubt it, but thought I'd ask. While I'm at it. Anyone know if you can have a vlsd rebuilt? I've heard its the fluid that looses its viscosity and makes it just an open diff. Can you just get some new fluid? It's going to be apart anyway. Just curious..

-Should I get an obd2 240. What stuff is actually different? Just has two 02 sensors and a different ecu? And again, can you plug in an s13 ecu to an s14 harness with everything lining up?

-It would be sweet if I could use my coilovers.. but I am pretty sure the s14s have a different way to setup suspension? Didn't they change some of the dimensions?

If anyone else thinks of some problems putting an s13 built motor into an s14 (besides the fact it's illegal to put a motor in a car that is older than the car itself) please pass it along. Anything I might want to know. I'm pretty sure the s14s were almost just cosmetic changes anyway over the s13.

thanks guys

[98s14inaz]

First you need an obdI s14 95. Next you will have to install the 95 head on your s13 block and use the 95 valve cover too. They are different. You can put what ever KA into any car you want as long as the car's original emissions equip is functioning and yo don't tell anyone. They look the same. You will need an s14 DS. Probably need some of the other s14 electronics as well.

OBDII 240's are a pain in the *** unless you have attention to detail. Lots of sensors that will trip cel codes. Make sure you don't get anything newer than a 96. 97-98 can only use JWT if a 96 ecu is swapped in.

The Diff will swap over if yu change the cover to the one on the s14. I can't remeber if the output shafts are different.

[D Money]

i dont see why he shouldnt keep the s13 valve cover/head on the s13 motor.The s13 head probably makes more power anyway. i got an s13 motor in my 95.

[PMan_S13]

That's the kind of info I'm looking for.

I planned on using the head off whatever car I get anyway, mine has some stripped out valve cover bolts that are annoying. But it isn't needed. Its the same head. And one is not better for power over the other... it's just that my '91 intake cam has more duration. That's where the extra power comes from.

I don't plan on keeping any of the emissions stuff. So long as it is obd1, I will be fine. I love how prehistoric the ecu is on the older Nissans. I took off everything from my '91 and I could still pass inspection here in Ohio. The ecu doesn't even know what's going on in the engine compartment. I really doubt I could pass tailpipe, but that doesn't really matter.

Now on the diff.. are you talking about the cover on the back of the diff, or..? which one? If the output shafts are different, it's only a matter of using the ones I have, correct? Actually, come to think of it, I think the halfshafts got trashed in the wreck. Might need to source those if needed.

Thanks

[PMan_S13]

this is just kinda bothering me recently..

anyone know if the s13 and s14 manual transmissions are the same?

I'm pretty sure they are.. and it is going to be s13 motor with s13 transmission.. but if the s13 transmission was shorter or longer it will be messed up, even if I use the longer s14 driveshaft.

[whoflungpoo]

IIRC, the transmission's are the same.

-i know the RPs13 driveshaft won't workon an s14. i was sold one by a friend when i did my swap, and 1: the carrier bearing is on the wrong half,2: it's shorter.

-There is a way to convert your harness from obd II to one, and it's not too complicated, here is the link (you need acrobat): http://www.jimwolftechnology.c...D.PDF

I'm about to do this to my 97 so it will quit kicking the 2nd o2 sensor code...

-The LSD should fit, i'm not too sure on the halvshafts though...

-as for the coilovers, i believe they're different.

[PMan_S13]

I'm considering using my halfshafts, if they survived.. to put on the lsd. Does anyone know if the wheel base is different on an s14 than on an s13? It might look funny if the wheels sit like an 1nch or two closer to the differential.

[PMan_S13]

anyone have an answer to the halfshaft question? Will I need to use the s13 halfshafts or can I use the s14 half shafts to install the vlsd?

also, trying to clarify on the ECU. Will I be able to plug my '91 manual ecu into the '95 auto ecu harness? Also, have heard that the auto ecu can run a manual motor, just not vice versa...