JDM vs USDM gte swap
02-01-10, 07:43 AM
#1
JDM vs USDM gte swap (update Last post)
Hello all 
I've been looking through a lot of info over the past few days and I just want to make sure I have my head on strait. I will be doing a 2jz-gte swap into my SC4. I have a wire harness that is supposedly a spliced harness for a 2jz-gte that is setup for OBDII.
Now these are the differences between the USDM and JDM that I've read about. I want to make sure they're correct before I dump 2k into an engine and not get what I expected.
The USDM has larger cams?
The JDM uses only MAP and the USDM uses MAP & MAF?
The Turbo's are different. This shouldn't matter as I'm doing a single turbo build
Another thing I'm uncertain about is VVTi
Here are my questions to be clarified:
Will a JDM engine work with OBDII and the harness I have?
Is there even a difference between US and J engine harnesses?
What year engine and ECU should I be looking for?
Thanks in advance,
Ben
I've been looking through a lot of info over the past few days and I just want to make sure I have my head on strait. I will be doing a 2jz-gte swap into my SC4. I have a wire harness that is supposedly a spliced harness for a 2jz-gte that is setup for OBDII.
Now these are the differences between the USDM and JDM that I've read about. I want to make sure they're correct before I dump 2k into an engine and not get what I expected.
The USDM has larger cams?
The JDM uses only MAP and the USDM uses MAP & MAF?
The Turbo's are different. This shouldn't matter as I'm doing a single turbo build
Another thing I'm uncertain about is VVTi
Here are my questions to be clarified:
Will a JDM engine work with OBDII and the harness I have?
Is there even a difference between US and J engine harnesses?
What year engine and ECU should I be looking for?
Thanks in advance,
Ben
Last edited by Shadowen; 02-02-10 at 08:32 AM.
02-01-10, 11:33 AM
#3
I'm just trying to figure this out because I've got 2 people offering to sell me an engine. My biggest concern is that I will get a JDM engine and it won't be compatible with my OBDII spliced harness.
02-01-10, 11:39 AM
#4
gte & na-t
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USdm TUrbo have the steel blades not ceramic like the JDM
USDM cams have 9 degree more duration on both intake and Exhaust.
No EGR on the JDM.
USDM use Maf not Map
USDM 550cc injector Low impedance
JDM 440cc high impedance
You most likely get an Aristo the oil pan will need to be converted to rear Sump.
VVTI
Variable valve timing with inelligence(VVT-i)optimizes engine efficency by constantly retarding or advancing intake valve timing depends on conditions and engine speeds.
The result is exceptional low-end torque to get you off the line ,mid--rang punch for passing situations and clean-burning efficiency throughout the rev range.
unlike some systems that switch between two compromise settings,VVT-i adjust continuously,tailoring performance to suit virtually any situation.
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
USDM cams have 9 degree more duration on both intake and Exhaust.
No EGR on the JDM.
USDM use Maf not Map
USDM 550cc injector Low impedance
JDM 440cc high impedance
You most likely get an Aristo the oil pan will need to be converted to rear Sump.
VVTI
Variable valve timing with inelligence(VVT-i)optimizes engine efficency by constantly retarding or advancing intake valve timing depends on conditions and engine speeds.
The result is exceptional low-end torque to get you off the line ,mid--rang punch for passing situations and clean-burning efficiency throughout the rev range.
unlike some systems that switch between two compromise settings,VVT-i adjust continuously,tailoring performance to suit virtually any situation.
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
02-01-10, 11:56 AM
#5
Lead Lap
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There are color differences between usdm and jdm wires, but usually they are very very similar. Having said that, I wouldn't use a USDM harness for a JDM engine. There might be just enough difference that can cause a big problem. Then you will have to open it up, cross reference colors, trace and splice etc.
Do yourself a favor and keep it simple. stick likes with likes. If you have an obdII harness, get an obdII engine.
As far as years go, once again try to keep it in the same OBD. This will prevent 99% of your problems.
Do yourself a favor and keep it simple. stick likes with likes. If you have an obdII harness, get an obdII engine.
As far as years go, once again try to keep it in the same OBD. This will prevent 99% of your problems.
02-01-10, 12:14 PM
#6
USdm TUrbo have the steel blades not ceramic like the JDM
USDM cams have 9 degree more duration on both intake and Exhaust.
No EGR on the JDM.
USDM use Maf not Map
USDM 550cc injector Low impedance
JDM 440cc high impedance
You most likely get an Aristo the oil pan will need to be converted to rear Sump.
VVTI
Variable valve timing with inelligence(VVT-i)optimizes engine efficency by constantly retarding or advancing intake valve timing depends on conditions and engine speeds.
The result is exceptional low-end torque to get you off the line ,mid--rang punch for passing situations and clean-burning efficiency throughout the rev range.
unlike some systems that switch between two compromise settings,VVT-i adjust continuously,tailoring performance to suit virtually any situation.
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
USDM cams have 9 degree more duration on both intake and Exhaust.
No EGR on the JDM.
USDM use Maf not Map
USDM 550cc injector Low impedance
JDM 440cc high impedance
You most likely get an Aristo the oil pan will need to be converted to rear Sump.
VVTI
Variable valve timing with inelligence(VVT-i)optimizes engine efficency by constantly retarding or advancing intake valve timing depends on conditions and engine speeds.
The result is exceptional low-end torque to get you off the line ,mid--rang punch for passing situations and clean-burning efficiency throughout the rev range.
unlike some systems that switch between two compromise settings,VVT-i adjust continuously,tailoring performance to suit virtually any situation.
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
http://www.supraforums.com/forum/sho...=jdm+2jzgte%22
There are color differences between usdm and jdm wires, but usually they are very very similar. Having said that, I wouldn't use a USDM harness for a JDM engine. There might be just enough difference that can cause a big problem. Then you will have to open it up, cross reference colors, trace and splice etc.
Do yourself a favor and keep it simple. stick likes with likes. If you have an obdII harness, get an obdII engine.
As far as years go, once again try to keep it in the same OBD. This will prevent 99% of your problems.
Do yourself a favor and keep it simple. stick likes with likes. If you have an obdII harness, get an obdII engine.
As far as years go, once again try to keep it in the same OBD. This will prevent 99% of your problems.
What year engine's have VVT-i?
02-01-10, 12:25 PM
#7
gte & na-t
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In Japan the VVTI started on the 97 models
In the US in 98 with the second Generation GSs and Supras.
Call dr Tweak and tell what you want and he will tell you what you need and you can go from there.
Because your best bet to get the OBD2 engine is to get the Aristo VVTi engine.
In the US in 98 with the second Generation GSs and Supras.
Call dr Tweak and tell what you want and he will tell you what you need and you can go from there.
Because your best bet to get the OBD2 engine is to get the Aristo VVTi engine.
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02-01-10, 12:31 PM
#8
In Japan the VVTI started on the 97 models
In the US in 98 with the second Generation GSs and Supras.
Call dr Tweak and tell what you want and he will tell you what you need and you can go from there.
Because your best bet to get the OBD2 engine is to get the Aristo VVTi engine.
In the US in 98 with the second Generation GSs and Supras.
Call dr Tweak and tell what you want and he will tell you what you need and you can go from there.
Because your best bet to get the OBD2 engine is to get the Aristo VVTi engine.
02-02-10, 08:32 AM
#10
Is it possible to tell if an engine is US spec or JDM spec?
I found an engine that a guy's had sitting for about 2 years in his garage. (said it was heated) I'm going to pick it up. I just want to ask all the questions first. Is there anything I'm missing? I've asked:
How many miles - Zero since rebuild
Rear sump - Yes
Year of engine - Not sure but possibly a 94
From - Supra I believe
After market parts - ARP Head, Main, Rods. Crower Cams, Springs and retainers, unortodox racing pulleys
Includes - New Water Pump, New 120A Alternator
What am I missing?
I found an engine that a guy's had sitting for about 2 years in his garage. (said it was heated) I'm going to pick it up. I just want to ask all the questions first. Is there anything I'm missing? I've asked:
How many miles - Zero since rebuild
Rear sump - Yes
Year of engine - Not sure but possibly a 94
From - Supra I believe
After market parts - ARP Head, Main, Rods. Crower Cams, Springs and retainers, unortodox racing pulleys
Includes - New Water Pump, New 120A Alternator
What am I missing?
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