FD alterator swap Into S4?

Raksj04 · 02-29-2012, 03:27 PM

I just bought a FD alterator, and I was wondering what I connectors that I need. I searched and didn't find anything. It has the pulley to line it up. It is a S4 JDM motor.

FerociousP · 02-29-2012, 03:40 PM

You need to buy a FD connector (same as s5) and wire up those two wires to the correct places. Apparently you can't use the same two from the s4 plug, just one of them. B+ goes to the same place obviously. Also, check the mounting locations, you may need spacers/washers/longer bolt to line everything up.

When I did this on my s5 everything bolted in with zero issues (other than changing the pulley)

googled s4 to FD alt (took 5sec btw):

Another way to look at it... may be simpler

Raksj04 · 02-29-2012, 03:51 PM

Thanks.

FerociousP · 02-29-2012, 04:26 PM

Also, I was able to mount the alt with the belts already in the grooves (barely).... but really you need a belt that is .5 to 1 inch longer to account for the alt case being bigger and not being able to travel as low as the s4 alt. May have to play with the belt length a bit, especially if you have a strut bar.

JustJeff · 03-03-2012, 10:17 PM

Raksj04 I wish you had asked me. I probably have a spare S5 harness going to the alternator. Let me know if you need one and I can see if I have a spare battery harness to cut one off of.

02-29-2012, 03:27 PM	#1
Raksj04 I have Ultra power in me. Join Date: Sep 2011 Posts: 457 Rep Power: 14	FD alterator swap Into S4? I just bought a FD alterator, and I was wondering what I connectors that I need. I searched and didn't find anything. It has the pulley to line it up. It is a S4 JDM motor.

02-29-2012, 03:40 PM	#2
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	You need to buy a FD connector (same as s5) and wire up those two wires to the correct places. Apparently you can't use the same two from the s4 plug, just one of them. B+ goes to the same place obviously. Also, check the mounting locations, you may need spacers/washers/longer bolt to line everything up. When I did this on my s5 everything bolted in with zero issues (other than changing the pulley) googled s4 to FD alt (took 5sec btw): Another way to look at it... may be simpler __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD Last edited by FerociousP; 02-29-2012 at 04:10 PM.

02-29-2012, 04:26 PM	#4
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	Also, I was able to mount the alt with the belts already in the grooves (barely).... but really you need a belt that is .5 to 1 inch longer to account for the alt case being bigger and not being able to travel as low as the s4 alt. May have to play with the belt length a bit, especially if you have a strut bar. __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

02-29-2012, 03:51 PM	#3
Raksj04 I have Ultra power in me. Join Date: Sep 2011 Posts: 457 Rep Power: 14	Thanks.