Franke

Hi

Do i need to modify any kabels to fit a -98 JDM engine in my -92 US Fd3s?

I will relocate the main harness to the other side but are there any other differences?

Franke

YOUWSH

I swapped a 97 JDM engine into my 93 JDM FD and I had to change everything wire, i.e dash, front, engine harness, etc.

It is A LOT of work and unless you do the work yourself it will cost you an arm and a leg to pay someone to swap it for you. It took me 2 months as you have to take the dash out, strip the whole interior, take off the front fender, bumper, etc just to get to the wiring harness.

If you plan on buying the 98 engine ONLY you cannot do it. Why? Because a 98 engine harness will not plug into a 92 US ECU. If this engine is from a half cut or front cut with all the wiring and cables included not to mention the ECU, this is the ONLY way you can do it. Then it is a simple matter of swapping everything over.

TRISPEEDFD3S

iTrader: (26)

Can't you just use the short block?

YOUWSH

I'm not 100% on this one but I imagine you can?

The only reason why I did it the way I did was my old engine harness was old and very brittle. I had a lot of electrical problems so after the swap it all went away.

Franke

My car is stripped from everything, it´s in for a paint jobb. (check the project in the link. PS the 20B picture is borrowed. It´s in Swedish. http://www.garaget.org/mypage/galler...2&image=110518)

I´m not going to use the mazda ECU,I will buy a new PFC.

My old US engine was sold to JDM car and he had no problems installing it, he swapped 1-2 wires.

Franke

Fd3stouring

iTrader: (2)

whats the difference in the two engines???just curious if it was worth the name JDM....

YOUWSH

98+ Series 7 Engine > 92-95 Series 6 Engine

Mazda made alot of improvements over the years this is why its simply not a matter of swapping the engine in and connecting the harness into your car, as the plugs don't fit!!!!!

Did you ever wonder why Apexi made 3 different types of Power FC's and that you can't just buy one for a Series 8 (FD3S3 and FD3S6) and expect it to plug and play into your Series 6?

I see it on the forum all the time when people buy a Power FC and are force to sell it because it was the wrong one.

Same story when it comes to engine swaps from a later series, i.e Series 7 or Series 8. You have to redo all the wiring in the front for it to work.

rexhvn

The engines in the later model FD's have sleighty differen't modifactions, increasing the power etc... JDM engines have more power than the US models, or AUS models. I myself have a later model engine (not sure exactly which model it came from) but has a very tall 5th gear so i'm assuming its a 99-02 spec engine and gear box. As YOUWSH said previously, you do need all of the wires and cables for the ECU as they do not plug into the 93' FD's ECU. Again, YOUWSH pretty much summed up the differences between the engines.

Franke

How can I identify exactly what series of engine i have? where exactly can i find the engine number?

Fredrik

YOUWSH

You'll find your engine number there but thats a good question as I'm not sure how you can tell from the number alone which series it came off.

If it has a metal cross over pipe coming from y pipe that usually tells you its a Series 7 or 8 motor.

Franke

OK thanks

I have looked for that mark but didn´t find it, but I will check again.
I will then ask Mazda what series of engine I have.

I think it has i plastic y pipe, but i had the black intake pipe?

What differences are there in the engineharness between a JDM and a US spec?

Fredrik

Mahjik

iTrader: (1)

The main thing to check with the engine is whether or not it has the solenoid rack or the "black box".

As far the harness, I believe the JDM harness does not have connectors for some of the US emissions parts and AWS. I think there is a connector which is different for the ECU side:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/jdm-motor-swap-japanese-engine-672062/

YOUWSH

Ok here is another easy of figuring out which engine you have.

Attached are pictures of a 92-95 ECU and if the harness running from the engine you have is thin and YELLOW then its a Series 6 motor. Mazda colour coded most of their harnesses which made life a lot easier when putting it back together as I found out.

Second picture is that of a Series 7 ECU which is distinct as the plugs are fatter and GREY. Series 8 ECU looks very similar to a Series 7.

Having said that, look at your engine harness now and which ever one it will plug into means thats your engine.

YOUWSH

..

Fd3stouring

iTrader: (2)

the Jdm motor probably will give you a few more horses..i mean come on would you rather take that couple of grand and get few hundreds of horses than do a complicated swap that'll probably break down and hard to find jdm parts...IMO i rather just rebuild the us motor and call it a day.

YOUWSH

This thread isn't even about rebuild vs JDM engine swap. Franke doesn't even live in the US for starters where there are many shops to get a rebuild from.

Also JDM parts aren't hard to find...you just need to know where to look and when it comes to stock parts off used FD's over in Japan....they are cheap as chips.

Franke

I have now checked the harness, and it has the old connectors.

So i will buy the series 6 PFC.

I also got the engines number and will check with Mazda for the exact production date.

Fredrik