drnick

as the engine is re-assembled and nearly complete ive been looking at wiring to see how this is going to work, the current situation utilises three different generations of wiring.... we have a GTS engine, an S4 harness, and the 86 car. my eyes are nearly shot from starring at poorly reproduced images of wiring diagrams and tracing the black lines, not helped by having to first stick several overlaping pages together (scanned pdf images) that more or less line up.

cutting a long story short, it would seem to be relatively straight forward! the engine will run without cats, no O2 sensor, no ignition control module and so adapting the harness to the engine is easy. from the harness to the car there are only two wiring differences on plug 'W' and only five on plug 'V' - here is the list i have made.

S4

HARNESS DESTINATION

w11 LH1 (ezk 13) XV 31b kickdown
w12 M86 J12/ k24 dash upshift indicator
w13 (1) (4) injectors XXV 87 LH jetronic
loop to w23
w14 LH35 / EZK29 XVI 87 EZK
w15 LH20 XX 85 fuel pump
w21 LH21 XXV 85 LH jetronic
w22 LH4 / EZK35 XXV 30 LH jetronic (+ve feed)
loop to u12
w23 LH9/ MAF2 XXV 87 LH jetronic
w24 m12 AC low - high pressure
w25 belt tension switch k22 central info 9





v11 O2 sensor Si Ab 42 / XX fuel pump (+ve feed)
v12 EZK25 u13 trans switch
?install switch?
v13 empty
v14 LH30 u23 XIV 85 starter
loop to u23
v15 LH15 j21 / G87 /F33
??????
v21 Si Ab 7 XXI 15a interior light
loop to c14
v22 Si Ab 24 XI 1 suppressor
loop to e12
v23 empty
v24 empty
v25 empty

S2

HARNESS DESTINATION

w11 XV 31b
w12 LH1 / EZF 16 j12
w13 injectors / O2 sensor Si Zu 42 / XX 87
w14 LH 18 / EZF 25 XVI 87
w15 LH 17 XX 85
w21 LH 21 XXV 85
w22 LH 4 XIV 87
w23 MAF 2 / LH9 XXV 87
w24 LH 16 m12 / AC low pressure
w25 belt tensioner switch L22

v11 G56, F27, F8, VC2

the only questions i have left (apart from whether it will work) are: do i need to install a transmission switch? what does the output from LH pin 15 do and where does it go after v15 and j21?

i am also converting from auto to manual and hopefully installing a double disc clutch.

John Speake

Nick,
Don't worry about pin 15 LH it is not a show stopper for you. It is effectively an input into the LH from the aircon compressor clutch.

Regards

drnick

john, thanks for the info and support. BTW do you need a nice stainless RMB for your S2?

John Speake

Hi Nick,
No problem ! That engine looks beautiful !

I do have an RMB for my 86 S2 thanks. I managed to get one made here in UK. I assume that one suitable for a US 86.5 would also fit my '86 S2 ? Is that how you sourced yours ?

When does the engine go into the car ?

Regards

drnick

yes the RMB is the same for the US 86.5 and late euro S2, i got mine from 928 int but i cant seem to find anyone in the UK to take it off my hands. the same will be true im sure with the engine when it comes out - speaking of which, im waiting for chris to give me a time to drop the car off!

John Speake

Hi Nick,
I'm sure one of the people on the 928uk list would be interested. There are quite a few '86 S2s on there.

Regards