What is the difference between the US spec engine and the JDM. Will the intake, header, and other components match up. I have a GSLSE and was considering installing the JDM if it is an easy swap. Actually the current engine is kaput so I am forced to make a swap. Anyone know? It's actually an SCCA ITS car but it's such an underdog I'm not worried about winning and being protesed.

 

Which JDM motor are you getting? A 12A? 13B? 12AT? We need more info.

 

Generally there isn't a whole lot of a difference. Less emissions. Slight power gains, usually not a whole lot; however, JDM engines can offer different options - for example: A fuel injected 12a turbo. We didn't get them here in the states, but in Japan they did.

 

We need more info for sure. Their are to many different JDM engine options..

 

It would replace the stock 13b out of the 84-85 GSLSE. I was told that a JDM engine that I found was out of the same year Cosmo but the long blocks(13b) are exactly the same. Is there a performance difference?

 

if my memory serves me correctly... I recall reading that the 13b wasn't offered for the 1st gens in japan, along with the s3 us spec interior. someone chime in

edit: you said cosmo, theres where Im in the dark. please disregard my post

 

This is a link to the engine I was considering
http://cgi.ebay.com/ebaymotors/MAZDA...QQcmdZViewItem

 

as long as the front cover is tapped for the mount it ought to be a bolt in.
thats not a bad price for that engine either.

 

i thought JDM 1st gens only came w/ the 12at in their top end model as opposed to our 13b in our gsl-se

 

That's true, Sgt. Stinkfist. The rest came with normal carbed 12a's.

Edit: Either that link to an ebay engine is wrong, or I am wrong. Either one is a large possibility.

 

If your running ITS then the best motor is going to be turbo 2 motor with S5 NA rotors in it, one of the guys that runs with us has a speedsource prepped ITS second gen with this setup and he's pretty damn fast. He also uses turbo 2 injectors on the secondary rail. Another guy thats decently quick has just an complete S5 motor in his car. If you can find one of these setups for cheaper or equal price it would probably be the better way to go.

 

You're right. But the engine came out of the Japanese line called a Cosmo. I wonder if the engine mounts are the same??

 

I agree Weed Wacker. However this is for the 1st gen GSLSE and the '86(s4 and s5) and later are not the same at all.

 

No idea about the mounts but if you swap out the front cover of your motor onto any other 13B it should mount up, i think. So then technically any 13B would fit if you put your front cover on it, right? Or am i just talking out of my *** here?

 

I only know both my RHD SA's has 12A carbs on them in Japan when i bought them in 1987

 

That something altogether new, in my book.

Its been common knowledge that Japan and Aus never received the GSL-SE or its 13B engine,they all got the 12AT.But that engine is something Ive never seen,it usually says "13B EGI" on the SE intake,not "Super Injection"..........hmmmm.

Id venture a guess that it might have been out of an old Cosmo or other J-spec rotary sedan......or perhaps they had a limited edition 1st gen in Japan,like the Infini??????


-edit-
Whoop,......just saw the refference to a Cosmo in the earlier post.
Thats new,have to add that picture and info to memory.

 

Since he already has the GSL-SE front cover and oil pan he has his choice of almost any motor he wants, money and engine management are his only restrictions.

 

what DriftFB said + whatever limitations he faces with his racing class

 

In the 2006 SCCA GCR it says nothing on the vehicle line stating that you can't run either of these setups, all it says is that it has to be a 13B with 9.4:1 compression, it says nothing against updating and backdating 13B's or whether it has to be a six-port or four-port, just that you have to run GSL-SE fuel injection.

If you put S5 N/A rotors then you will be at 9.7: instead of 9.4:1. That is however, illegal so i don't condone this behavior, but if your running a regional only class that they don't check anything but your weight and give you a visual inspection to make sure you don't have a turbo or anyithng then wouldn't you just be leveling the playing field?

Also, like i said earlier, and as repeated and confirmed by DriftFB, you already have all the necessary equipment to put in almost any 13B, so why get a JDM one if you can get one cheaper here? The manifolds look different, but the engine itself is the same. Besides you couldn't use the JDM fuel injection anyway, because it's not the stock GSL-SE fuel injection.

 

Put in a 12 a turbo and use the 13b turbo unit with racing beat header flange and see what you will do to the competition.

 

Turbo is illegal in SCCA wheel-to-wheel competition.

 

and as said, they do a look over inspection for that kind of stuff.

 

As I saw the rules for ITS any engine would work as long as it was in that models offerings for any year RX-7? I don't recall if there is a specification for released in the US or which generation car? I am sure there is something somewhere in the GCR that will define that tho. I think you can use any size injectors you want to as long as the original ECU is connected to it. Don't you compete against second gen RX's? I am building an ITS car for next year and would love to have some feedback from you guys as well. I too would be interested in the JDM engines too because I have heard the HP numbers are much higher than even the 2nd gens from some real fast guys. I can't imagine that anyone would protest you for this? I wish I could remember the numbers tho! lol

 

^I've heard that normally the power is higher because of the emissions and the fuel the enigine is designed to run off, not so much differences in the motor.