so I am converting my Jdm turbo S5 to run on S4 fuel managment to get out of the Jdm bullshit, but just realized the OMP on the Jdm is a electronic OMP!!!! so basically what is my easiest route around this problem, was looking at the intake manifold and it doesnt look like i would be able mount a S4 manual (linkage) OMP!!! from what i can recall working on na rotary's the S4 OMP will not bolt on the S5 front cover, correct me if i am wrong! So any suggestions?

 

Swap the front cover or premix.

 

okay if i swap front cover does anybody have info on the linkage omp, like adjustment and how the linkage is hooked up to the throttle linkage on a S5 intake manifold, and if i premix and call it a day, does anybody have any good premix info, like the proper premix ratio, OMP block off plates (i might just make my own ), and a good fuel filter to use when u convert to premix??!! please and thanx

 

good god man, i believe to premix its a ounce a gallon(i could be wrong might want to double check that) the stock one is good to go, no need to change it..

:AA:

 

wouldnt it just be easier to run it off of the S5 ecu?

 

The series five has a different plug for the large plug that goes from the FRONT harness to the ECU and the two series four FRONT harness plugs that mate with the series five EM harness are different.

So. All you have to do to use the series five EM harness in a series four car, is FIRST cop a ECU plug off a wrecked series five car. Then depin the plug off the series four FRONT harness that mated with the series four ECU. Repin the plug you copped off the wrecked series five car so the wiring matches the pins on the series five ECU where THAT plug mates.

Then do the same with the other two plugs. Talking about the two other plugs on the FRONT harness that need to mate with the series five EM harness. Cop those two plugs off a series five wreck (off the FRONT harness) and then depin the series four plugs on the FRONT harness that previously mated to the series four EM harness, and put the right wires in the right sockets on the *new*, two front harness mating plugs.

Why, there's nothing to it. Piece of cake. Probably done by hundreds.

All the above made sense to me except the sentence above.

 

The easiest method (other than premixing) would be to use the S4 front cover and OMP. The linkage requires no modification to reach the S5 TB.

 

so if its a Jdm motor and a Jdm S5 engine harness (which by the way, wiring diagrams are in japanese) i need to repin everything to match and function? Man, i must be missing something, I cant seem to figure out how to CHOP and MATE a JAPANESE harness and hardwire into the US S4 harnesses ( and by implying more than one harness i mean the front harness for headlights? and DASH harness that is the third plug for the ECU.

 

is there possibly any pics of this setup available, showing how i would hook up the linkage OMP to the S5 TB??? Trust me man, i have searched and still am searching.....please and thanx

 

I'm pretty sure you'd have to modify the S5 throttle body, i dont think the connector is there.

 

No. You need to stay on course and use a series four ECU and EM harness (EM goes on the engine).

My post above was poking fun at people who think they can plug a series five (much less series five JDM) harness in a series four and think the plugs on the series four will mate with the series five. As in plug 'n play. Nope. Just having fun.

It could be done though, with a bit of planning and fore thought. Oh! and loads of time.

 

I guess it depends on what the person's proficiency is. I thought of that because for a while i was at college and couldnt take my car with me, but I could take bits and pieces to modify while there. In that situation, it would be easier to modify the harnesses to work/make adapter mini-harnesses, plus you would get a faster ECU that was meant for the engine.

I did a similar thing rebuilding the emissions harness for a turbo swap running off a megasquirt, using plugs from the S4 ECU, radioshack connectors, scrap emissions connectors, and GM connectors to get it to all come together. If i had access to the car that whole time, I probably would have done it differently, but this is just what pops to mind first for me.

 

I think I can find one of my old setup.


You gotta admit, that was some very eloquent sarcasm though.

 

There is no "JDM bullshit" in this swap. The only problems are from mixing series.

 

as for the rest of u ppl, thanx a whole lot for the help as i go through this nightmare swap!

 

The fact that it's a JDM engine is completely irrelevant. All the compatibility issues mentioned above are because you're putting an S5 engine into an S4, not because it's a JDM engine. If you were putting in an S4 JDM engine you'd have practically no compatibility issues. The harness is another story. IMO using a RHD Emissions harness in a LHD car is just dumb. In fact not leaving the S4 Emissions harness right where it is is also dumb. It's just creating extra work for zero benefit.

I don't know why people make these swaps so hard. Using the right engine for the car makes life so much easier, but even putting an S5 engine into and S4 (which I personally think is worth the extra effort) is made so much easier by sticking with the same series electronics and leaving the original Emissions harness in place.

 

I thought I had a pic, but alas it's too hard to see.

 

Can't he just use his S4 TB?

Been a while since I looked at *stock* S4 stuff,but doesn't it just have a hole in the main throttle shaft for the rod to go through?

But either way I'm sure he could swap TPS's and use the S4 TB.

 

Yea I mean he has to switch TPS' anyways.

 

cool thanx for all the good help and info!