George/Luke - Pick yer brain please

Guys - question
I took my '96 SE-R harness down to my uncles shop today to test fit it to the plugs on the DET.....
Nothing fits lol - like maybe 2 plugs total and thats it :-( For example the Throttle position sensor has 6 wires coming from it - my harness and the FSM shows three..... Is this normal? Do I need an older SE-R harness?

Also - anyone know where to get what the stampings on the motors mean - my says SR20 - then a number and at the end 961A or 96A (can't remember at the moment) - does that mean its a 96 motor?

Thanks
Chris

Doh - I thought this would be easy - er

Originally posted by MauiBlueGRide
Guys - question
I took my '96 SE-R harness down to my uncles shop today to test fit it to the plugs on the DET.....
Nothing fits lol - like maybe 2 plugs total and thats it :-( For example the Throttle position sensor has 6 wires coming from it - my harness and the FSM shows three..... Is this normal? Do I need an older SE-R harness?


Well, you should be able to plug in virtually all of them. You may have to reroute the harness and/or extend it in some areas since the 96 harness is for a low port engine. The SR20DET is a high port engine. Therefore, the wires might need to be slightly redirected or extended.

You will need to replace both water temp sending units with USM units. They will plug into your harness. The injectors, knock sensor, oil presure switch, etc., etc. will plug in. Be aware that you will have to switch to a USM TPS. You will also have to use the distributor from a 96+ SE-R as the 96 harness is for a different distributor with an internal coil. There are some hints on SE-R.net of changes that must be made when installing a DET in a 95+ SE-R.

If you were to use a different harness, you would want to use a 91/92 harness. It will lay right up. You will only end up with one unused connector and only have to redirect one wire/connector.

Originally posted by MauiBlueGRide
Also - anyone know where to get what the stampings on the motors mean - my says SR20 - then a number and at the end 961A or 96A (can't remember at the moment) - does that mean its a 96 motor?


No idea. Probably not though.

Originally posted by MauiBlueGRide
Doh - I thought this would be easy - er


There is a definite learning curve.

I THINK all 96 and above are OBD2 ecu and harness...if that's the case, it will be a lot easier to use your factory intake manifold (assuming you have a DE motor) because there is going to be a good amount of plugs that needs splicing with the obd2 harness. What i did was i got a obd1 ecu and harness from a B13 DE and i was able to plug in almost all the plugs in the DET motor using the DET intake manifold..the TPS i had to splice. also check to see if your car uses a electronic speed sensor on the tranny or not...cuz if you do, make sure to get a harness/ecu that has the speed sensor...or your speedo wont work. if you use a 93 NX2000 harness (the one i am using for my DET) it comes with the speed sensor plug.

Originally posted by G22DET
I THINK all 96 and above are OBD2 ecu and harness...if that's the case, it will be a lot easier to use your factory intake manifold (assuming you have a DE motor) because there is going to be a good amount of plugs that needs splicing with the obd2 harness.


You cannot use the low port manifold on the high port DET. It will stick up too high and keep your hood from closing.

Originally posted by G22DET
What i did was i got a obd1 ecu and harness from a B13 DE and i was able to plug in almost all the plugs in the DET motor using the DET intake manifold..the TPS i had to splice.

Like I said, you should use a USM TPS.

There are a number of people on the SE-R mailing list who have installed a DET in a OBD-II car. The harness does indeed need some modification, but almost all the connectors should still work if you change to the later model distributor.

Here is some information regarding installing a DET in an OBD-II car:

http://www.se-r.net/engine/swap/index.html

i prefer not to use the OBD2 harness and ecu for 2 reasons:
1) the engine check light will be on, 100% guaranteed..that means your motor will not be running at 100% because the ecu will tell the motor not to run at it's best form, it has sensed somehting that's wrong.
2) using a OBD1 ecu means that you can get it remapped by JWT or others. No one so far has the ability to crack OBD2 thus you are pretty much stuck with it....unless you use an AFC or some sort to fine tune it...the car would still run great, but not best.

Luke,
Maybe you got some mis-information?

I've got a 97 200sx, 96 se-r harness, and a reprogrammed 97 JWT ecu.... In fact the EGR was programmed to work on the ecu but it was sent back off to be disabled.... A lot of guys run this route and I don't believe they get check engine lights.... I think that ODBII was 98+ maybe? I could be wrong on that one......
Anyways I'll let you know how mine goes when its done.
Chris

Originally posted by G22DET
i prefer not to use the OBD2 harness and ecu for 2 reasons:
1) the engine check light will be on, 100% guaranteed..that means your motor will not be running at 100% because the ecu will tell the motor not to run at it's best form, it has sensed somehting that's wrong.
2) using a OBD1 ecu means that you can get it remapped by JWT or others. No one so far has the ability to crack OBD2 thus you are pretty much stuck with it....unless you use an AFC or some sort to fine tune it...the car would still run great, but not best.

That's not totally true. JWT has cracked the OBD-II code for some cars. They can reprogram a SR20 ECU up until 97. They can also tell you how to use a 97 ECU in a later chassis. That is what they did with their B15 turbo SEMA car. I know a bunch of folks running a 97 ECU with a 98+ car.

When JWT reprograms the ECU they can kill certain things that will throw a code.

Oh ok...I see, i was using my car as an example of OBD2...i know they cant crack the codes yet...didnt know that 96 and older ecus can be remapped.

Actually 97 and down can be remapped... as well as the same year 1.6L ecu's JWT is just great :-P

chris