st185 jdm compared to the usdm 3sgte?

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st185 jdm compared to the usdm 3sgte?

Postby 903SGTE » Sun Aug 27, 2006 10:07 pm

whats the diffrence between the jdm and usdm 3sgte? i have a 1990 st185 and was thinking of installing a jdm motor. what to i need or what needs to be done to get this swap to be done correctly?
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Postby RIalltrac » Mon Aug 28, 2006 12:03 am

theres really no difference, the biggest difference lies in the ecu and the harness. The harness is set up for rhd while the usdm is setup for lhd. Just enters the cabin on the other side of the car. The only thing youll notice about the two engines is that the head on the jdm isnt setup for egr equipment. Other than that the engine itself is rather identical.
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Postby 903SGTE » Mon Aug 28, 2006 12:25 am

so can the jdm be put into the usdm car? harness and all?? also what about the trans?? can i use the engine and trans in my 90 alltrac? is the gearing between the front diff and rear diff going to be the same?
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Postby jlspec » Mon Aug 28, 2006 12:40 am

They are 100% the same.
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Postby jlspec » Mon Aug 28, 2006 12:42 am

Minus the EGR and ECU.
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Postby TheAutoholic » Mon Aug 28, 2006 12:53 am

Yes. No EGR for the win. 8)
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Postby 903SGTE » Mon Aug 28, 2006 9:25 am

so the trans will work with my rear end? the ratio between the front diff and the rear diff are the same? also what about all the accesories on the engine? is the location of the ps pump and alt. in the same place or do i have to swap over my mounting brackets so i can move the accesories to the right location? thanks for the help.
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Postby theUNYTEDone » Mon Aug 28, 2006 9:30 am

jlspec wrote:Minus the EGR and ECU.

+1

an EGR-less engine bay is so lovely.
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Postby RIalltrac » Mon Aug 28, 2006 10:42 am

903SGTE wrote:so the trans will work with my rear end? the ratio between the front diff and the rear diff are the same? also what about all the accesories on the engine? is the location of the ps pump and alt. in the same place or do i have to swap over my mounting brackets so i can move the accesories to the right location? thanks for the help.


If you have a jdm engine the only thing you would need to make it work in your usdm alltrac would be the usdm wiring harness, the jdm one goes into the cabin on the other side of the car, so its not exactly set up to go the way you need it to go. Otherwise, its a complete plug and play setup.
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Postby klue » Mon Aug 28, 2006 12:24 pm

doenst the jdm one has higher compression, cermaic turbo, no egr, egt probe on downpipe, fuel and timing maps are more agressive, harness is differnt
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Postby Conan » Mon Aug 28, 2006 12:30 pm

klue wrote:doenst the jdm one has higher compression, cermaic turbo, no egr, egt probe on downpipe, fuel and timing maps are more agressive, harness is differnt

:D yeah, also anti-lag, launch control, water injection, forged internals, triple plate clutch and fuel cut at 32 psi :evil:

Seriously though, ceramic part is true. Everything else was either covered by the ECU part or not true.
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Postby gt4tified » Mon Aug 28, 2006 12:39 pm

I'm not too sure but I think/hear somewhere that the JDM ecu's were programmed for a bit higher (or was it lower?) octane content pump gas than the USDM....can anyone confirm this?
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Postby Conan » Mon Aug 28, 2006 1:31 pm

gt4tified wrote:I'm not too sure but I think/hear somewhere that the JDM ecu's were programmed for a bit higher (or was it lower?) octane content pump gas than the USDM....can anyone confirm this?

Yes, more aggressive timing due to higher octane, it's still in the ECU though...
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Postby QIK_GT4 » Mon Aug 28, 2006 10:53 pm

jdm only come with 1 primary cat thus changing to 3" dump = no cat left lol...
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Postby 903SGTE » Mon Aug 28, 2006 11:44 pm

so all the acessories are in the same place? what about the speedo cable in the trans?
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