JDM Motor

AaroNX · Jun 18th, 2002, 02:43 PM

Hey does anybody know the differences between USDM and JDM sr20de's. I know the C/R is higher and no EGR on the JDM. Is that all though? Thanks

Jun 19th, 2002, 03:03 PM

yeah 10 more HP and bigger inverted runners

Jun 19th, 2002, 11:24 PM

JDM's motor's are all high port too, 93 or 94 USDM changed to low port
and a longer header

Jun 20th, 2002, 09:13 AM

No AIV valve too.

AaroNX · Jun 20th, 2002, 06:06 PM

The wiring will be the same between the two motors though right?

Jun 20th, 2002, 11:01 PM

yes it is, exsept the TPS might be difrent, i know it is on the BB but i dont know about the NA engines, but you can swap it with the usdm engine.

hybrid DET · Jun 21st, 2002, 03:31 AM

not all jdm motors had the 10:1 compression with the tubular manifold and ten additional horsepower.

There are also 9.5:1 jdm motors with 140hp and no egr valve. The US wiring harness will still match up except for the two connectors for the EGR valve.

AaroNX · Jun 21st, 2002, 05:02 PM

How do you know which ones have the 10:1 compression. I thought that they all had it.

wickedsr20de · Jun 22nd, 2002, 05:52 PM

There are engine codes on the engine. I forgot where but some place on the net posted all the egine codes. I do not know if this would work but you can try taking one of the spark plugs out and see if the pistons are high compression. Usally the have a raised face. If i am not mistaken I thnk the stroke is different too or I could be wrong

Jun 27th, 2002, 07:28 PM

I have a JDM intake Manifold and exhaust manifold? Has anyone done this swap on there USDM car???? If so did they notice any hp difference?

CarbonBlack200 · Jun 27th, 2002, 09:46 PM

I thought JDM intake manifold and exhaust manifold won't work on US cars. Even with JDM Primera swap, you need U.S. spec in/ex manifold to make the emission system to work. Since JDM parts have less restriction (less emission crap), it might feel a little better, but i don't see any advantage doing this. . .
Yeah, emission system sux, but we gotta save our earth...

Jun 27th, 2002, 10:24 PM

Well were I am at I don't have to worry about any emissions. I figure with the longer runners that are slightly bigger I could increase my hp or torque ratings slightly or even increase throttle response.... as far as I know the JDM header is close to the same guage as a pacesetter which are shit by my standards but better then a stock exhaust manifold!!!!

AaroNX · Jun 28th, 2002, 10:37 AM

yeah I have no emisions either. I have a Hot shot header with no cat or resonator and a universal straight through muffler. Just bought a JDM motor and it has the jdm header on it. I think you would probably see a nice gain over the stock manifold.

TREYDEE · Jul 10th, 2002, 05:07 PM

The most acurate way to find out if you have a 10:1 motor
is to take off the head, if your pistons are flat top then you have a 10:1 motor.If your pistons have elevated rim on the top then you
have 9:5:1

hay correct me if I'm wronge!!!!

wickedsr20de · Jul 11th, 2002, 03:43 AM

I just want to know for all you guys with the JDM 10 to 1 motor ----How much of a difference did you feel compared to your us spec sr20de?