so i finally made up my mind on an ls swap, its sitting in my buddy's shed and she'll be mine very shortly. i have a couple questions though. ive never actually swapped an engine into a car that the car didn't already come with. so here's my questions, oh by the way it comes with a cable tranny and i have a 1990 civic si

1, do i need different axles and hubs?
2, should this match right up to my body harness?
3, how much more does this motor and tranny setup weigh than a d series,
4, what kind of suspension set up should i run up front

thanks!

 

I'm taking it you will be back with a lot more questions.
PLEASE try using the search function OR google.
Your swap is nothing new.... there is lots of info to be found just by searching for it.

1. No new hubs.
Yes, different axles. Uses ones from a 90-93 Integra.
Remove dust seal from inside hub.

2. You use your Si harness and modify it to the motor.

3. Use Google.

4. Stock is ok or go with a little higher rate aftermarket.

 

You'll need motor mounts, shift linkage,axles, halfshaft and rear t bracket from integra.
I did this as my first swap and with 2 friends we had the motor out ls in and driving
in less than 6 hours and ran 15.1 at 90mph

 

i did all the hard work, you're welcome

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/detailed-b-series-into-crx-ef-civic-parts-list-more-2769325/

 

If you really want to know, I did this swap in my ef 4 door, PM me and I'll walk you through step-by-step

 

-convert your car to multipoint
-get or make an obd0 to obd1 jumper harness for the ecu
-convert your engine harness to vtec capable and obd1
-either use the obd0 injectors with resistor box wired in or
-use obd1 injectors injector plugs and a resistor box delete
-when you get the ecu jumper make sure it is prewired for vtec and a 4 wire o2 sensor
-wire the o2 to the jumper harness

as for the oem shift linkage it wont work unless modified so you'll need to

-find 90-93 integra linkage and modify it
-buy the ef b series linkage from hasport or another aftermarket manufacturer

for transmission you will either go with a cable style transmission or you can go with a hydro setup but you'll have to run a slave cylinder line and convert your pedals accordingly

mounts
-either buy cable mounts that will work with a cable transmission setup
-buy hydro mounts that allow you to use a hydro transmission

you will need for the swap regardless of hydro or cable
-90-93 integra rear transmission t bracket
-90-93 integra manual transmission intermediate shaft and corresponding axles
-or 94-01 manual intermediate shaft and corresponding axles (I've read that you have to mess with the transmission seal if you use 94-01 axles)
-90-93 post mount which is the bracket on the drivers side of the engine that you bolt the mount to

 

I did everything that was said above except the axles. I used first gen integra axles on my sedan instead and didnt get rid of the dust shields. Nothing binds and everything is alligned and car drives straight. I had many people tell me that these axles wouldnt work and i was wasting my time but in all actuality they in my opinion work better than when i used 90-93 integra axles in my civic hatch that was totaled. Yes first and secon gen axles will work but first gen axles are slightly shorter making them fit better.

 

my 90-93 axles work so well.
you take the dust ring off on the outside part and it spins perfectly
and there is absolutely no slack and it torques down perfectly.

 

Is your car lowered? I believe those axles are shorter and give a gap or pull on the CV joint on a stock ride height.

 

yeah it's lowered about 4 inches at the moment, once again there will be a whole new suspension setup when i swap it, ill bring it up to 3.5 inches below stock ride height. all great advice. thanks so much

 

Ignore everything mentioned about vtec, the motor you have does not have vtec. Also, you may not need a jumper since your motor might be OBD0 if it is 90-91. You already have a cable tranny so ignore the hydro tranny part.

 

The car is a si so the wiring will plug right in, I even used my d series dizzy and ecu
for a while but only one bolt lined up.

 

........
there's nothing about vtec mentioned.
my LS is OBD0, i'm going to convert to OBD1, it makes about 12HP more.
I'd suggest just getting OBD1 parts as part of the swap, its not hard to wire in at all, mostly plug and play.

 

Yes, gnxpro gave him wiring advice about vtec, his LS engine does not have vtec so he doesn't need to worry about it. Thats what I am saying.

Also converting an OBD0 LS engine to OBD1 doesn't give it 12 more horsepower.
And you're also mistaken, it would be 10 more hp, 90-91 are 130 and 92-93 are 140.

 

if youre gonna buy an ecu jumper instead of being cheap buy one prewired for vtec if you ever plan on having money for a GS-R or B16 swap

 

Oh i see the vtec line noww, i got lost in all the text.

and 10, 12, who cares, its close enough.
point is, OBD1 LS makes more power is all im pointing out.

 

yeah i'm not exactly sure whether it's obd0 or obd1. i know for sure i'ts a cable tranny, while this motor is in i'll be rebuilding and building up my d16a6, Itb's 11.8:1 compression, stroked to 1.6l and hks cam. it'll be on the marketplace this summer

 

you can tell if its OBD1 by the ecu you got and you can tell by the style of plugs on the engine harness.

 

yeah my car is dumped. i havent had any gap or have it pull on the cv joint but im not at stock ride height. i have used both 1st and 2nd gen integra axles and both worked.

 

i havent actually looked at it yet. but next week i'll be over there to take a look and hopefully buy it

 

I'm also doing my FIRST LS swap into my 90 EFsi. I purchased a complete swap(axles, tranny, ECU blah blah etc..) All i need is motor mounts. Only problem i'm worried about is OBD1 wiring, is there any diagram i could look at? Walk through?

 

it's really easy.
look up OBD0 to OBD1 conversion on the site.

 

https://honda-tech.com/forums/showthread.php?t=2769325