JDM vs. US
11-16-10, 12:48 AM
#2
S4 and S5 Jspec transmissions have a 0.806 5th gear, and the 5th gear switch is absent.
S4 and S5 transmissions in general have different mounting positions for the crossmembers, and the US versions have 5th gear ratios of 0.762 (S4) and 0.719 (S5).
S4 and S5 transmissions in general have different mounting positions for the crossmembers, and the US versions have 5th gear ratios of 0.762 (S4) and 0.719 (S5).
11-16-10, 01:09 AM
#3
Senior Member
Thread Starter
iTrader: (1)
Join Date: Nov 2009
Location: S.F.
Posts: 730
Likes: 0
Received 0 Likes
on
0 Posts
Oh cool. i only ask cause there is a JDM transmission in my area for a few hundred with no grinds. Mine grinds and leaks. So the s4 trans wont work for the s5 right? Also what is the 5th gear switch and what does it do?
11-16-10, 01:17 AM
#4
If the S4 transmission has the matching crossmember, it will bolt right into an S5.
The 5th gear switch is used by the ECU to trigger the split air solenoid, which directs air to the main cat. It also prevents the shift up light from coming on in 5th gear. To make it easy, you can just transfer your existing US 5th gear / reverse switch to the new transmission. They go in the same location.
The 5th gear switch is used by the ECU to trigger the split air solenoid, which directs air to the main cat. It also prevents the shift up light from coming on in 5th gear. To make it easy, you can just transfer your existing US 5th gear / reverse switch to the new transmission. They go in the same location.
02-25-11, 02:13 PM
#7
Bringing this one back.
I've got a S5 JDM engine and tranny swapped into my vert. I didn't do the swap, I paid a shop to do it. Because of that I'm a little unsure about the details of this...but here's my situation.
My reverse lights never worked after the swap, which never really bothered me much. But now that I'm rebuilding the engine I'd like to fix this. If I'm understanding this correctly what I need is to get a USDM S5 switch for the transmission and that will plug into my N/A harness?
Just read another thread on similar topic. From that one I can simply plug my 2 plug harness into the transmission's matching prong and that will have my reverse lights working. I don't really need to worry about the 5th gear switch.
I've got a S5 JDM engine and tranny swapped into my vert. I didn't do the swap, I paid a shop to do it. Because of that I'm a little unsure about the details of this...but here's my situation.
My reverse lights never worked after the swap, which never really bothered me much. But now that I'm rebuilding the engine I'd like to fix this. If I'm understanding this correctly what I need is to get a USDM S5 switch for the transmission and that will plug into my N/A harness?
Just read another thread on similar topic. From that one I can simply plug my 2 plug harness into the transmission's matching prong and that will have my reverse lights working. I don't really need to worry about the 5th gear switch.
Trending Topics
02-25-11, 03:26 PM
#8
You do not need the 5th gear switch to get it to work. Just match up the reverse switch to your harness. If you changed series the plug may be different and you will have to install a new plug. For a long time I just soldered them together but it got annoying to have to redo it anytime I took the trans out.
02-25-11, 11:02 PM
#10
You do not need the 5th gear switch to get it to work. Just match up the reverse switch to your harness. If you changed series the plug may be different and you will have to install a new plug. For a long time I just soldered them together but it got annoying to have to redo it anytime I took the trans out.
No, what he is saying is that so far as the transmissions 5th gear switch is concerned it won't affect emissions testing because they do not test your car in 5th gear.
02-25-11, 11:02 PM
#11
Senior Member
Thread Starter
iTrader: (1)
Join Date: Nov 2009
Location: S.F.
Posts: 730
Likes: 0
Received 0 Likes
on
0 Posts
If the S4 transmission has the matching crossmember, it will bolt right into an S5.
The 5th gear switch is used by the ECU to trigger the split air solenoid, which directs air to the main cat. It also prevents the shift up light from coming on in 5th gear. To make it easy, you can just transfer your existing US 5th gear / reverse switch to the new transmission. They go in the same location.
The 5th gear switch is used by the ECU to trigger the split air solenoid, which directs air to the main cat. It also prevents the shift up light from coming on in 5th gear. To make it easy, you can just transfer your existing US 5th gear / reverse switch to the new transmission. They go in the same location.
02-25-11, 11:29 PM
#13
My reverse lights never worked after the swap, which never really bothered me much. But now that I'm rebuilding the engine I'd like to fix this. If I'm understanding this correctly what I need is to get a USDM S5 switch for the transmission and that will plug into my N/A harness?
Just read another thread on similar topic. From that one I can simply plug my 2 plug harness into the transmission's matching prong and that will have my reverse lights working. I don't really need to worry about the 5th gear switch.
What? No, the 5th gear/reverse switch is a 4-prong switch on US cars. The JDM version is just a reverse switch with 2 prongs.
02-25-11, 11:42 PM
#15
I don't have to worry about the shift up light. I have a S5.
Thread
Thread Starter
Forum
Replies
Last Post
distr0
Canadian Forum
3
10-07-15 08:17 AM
13bt, 13btt, area, bay, difference, fd3s, jdm, rx7, s4, smog, t2, tranny, transmission, transmissions
