difference between j-spec and US-spec for 2nd gen?
#1
difference between j-spec and US-spec for 2nd gen?
hi, we all have been talking about j-spec engine, importing j-spec car all the time, but I couldn't find a thread or much information to detail all difference between the two. information such as: ECU? are they using the same ECU? what about AFM? etc.
here are some thing that I noticed after upgrade my GXL to a turbo with a j-spec engine.
1)upper intake manifold
2)BAC: us one can be adjusted, but j-spec won't
3)j-spec don't have AWS
4)ECU? I am not quite sure about this one. I know N370 is used for 89+ TII in US, but I heard that jspec uses N374. anyone heard about this? on my j-spec engine, it came with N374 BAC
therefore, I really want to create a detail table to list all part number for things like ecu, boost sensor, BAC, AFM, etc to distinguish the j-spec and US-spec.
welcome for any idea, which I definitely need you guys' expertise. I think this will be very helpful for all of us.
comments?
here are some thing that I noticed after upgrade my GXL to a turbo with a j-spec engine.
1)upper intake manifold
2)BAC: us one can be adjusted, but j-spec won't
3)j-spec don't have AWS
4)ECU? I am not quite sure about this one. I know N370 is used for 89+ TII in US, but I heard that jspec uses N374. anyone heard about this? on my j-spec engine, it came with N374 BAC
therefore, I really want to create a detail table to list all part number for things like ecu, boost sensor, BAC, AFM, etc to distinguish the j-spec and US-spec.
welcome for any idea, which I definitely need you guys' expertise. I think this will be very helpful for all of us.
comments?
#2
knowledge junkie
ECUs different as they run MUCH higher octane gas.
Emmission controls are different too.
I know we've listed the differences before. I'm sure there somewhere on this site or another website.
Emmission controls are different too.
I know we've listed the differences before. I'm sure there somewhere on this site or another website.
#3
also, I was told that the j-spec ecu has speed limit set in the chip. so, the j-spec ecu won't be useful here since we don't have high octane gas like in japan? and that is why the BAC different, as well?
if anyone knows where the list as vaughnc said, please let me know.
thanks
if anyone knows where the list as vaughnc said, please let me know.
thanks
#6
really? I got 3 BACs here from j-spec engine. none of them can be adjusted. wonder that they make some special one? like the engine on my car. that is why I am having problem to get the correct idle rpm. mine desn't even has AWS, and sensor near the tPS. even my spare engine is the same. have anyone seen one like that?
what about AFM. anyone knows about which is which for which model?
like n350 FOR N/A, and N370 for turbo etc
what about AFM. anyone knows about which is which for which model?
like n350 FOR N/A, and N370 for turbo etc
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#8
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Originally posted by vaughnc
ECUs different as they run MUCH higher octane gas.
ECUs different as they run MUCH higher octane gas.
#9
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Originally posted by HWO
all the FC's we get in NZ are straight outta japan, and they all have adjustable BAC valves on them
all the FC's we get in NZ are straight outta japan, and they all have adjustable BAC valves on them
#11
Lives on the Forum
Originally posted by Rancid7
hey reted !? do you think you could shed some light on this subject .
hey reted !? do you think you could shed some light on this subject .
I'm against an NA to turbo conversion in the first place, so I didn't post any replies to this thread...
To adjust idle, you need to adjust the throttle stop screw on the TB under the IC...
-Ted
#12
ecu
Originally posted by NZConvertible
That's true these days, but wasn't when the FC was made. JDM FC's are tuned to run on "normal gas". If they were tuned to run on high octane gas they'd make more power than US cars, but they don't. They also run fine on our gas, which sure isn't high octane!
That's true these days, but wasn't when the FC was made. JDM FC's are tuned to run on "normal gas". If they were tuned to run on high octane gas they'd make more power than US cars, but they don't. They also run fine on our gas, which sure isn't high octane!
my another question is that AFM N350 is used for n/a, and N370 is for TII, but can we swap them? like put N350 on TII? according to book, both of them have the same resistence in open and close states, even for intake themosensor.
any one tried that before?
#13
Originally posted by RETed
Uh, like?
I'm against an NA to turbo conversion in the first place, so I didn't post any replies to this thread...
To adjust idle, you need to adjust the throttle stop screw on the TB under the IC...
-Ted
Uh, like?
I'm against an NA to turbo conversion in the first place, so I didn't post any replies to this thread...
To adjust idle, you need to adjust the throttle stop screw on the TB under the IC...
-Ted
I do turn the screw to adjust idle, but it seems not working every well. at least it is hard for me. since the AWS is missing on j-spec intake, mine motor just hard to start at cold. I have to keep the throttle open until the car actually runs at normal temp. othewise, it will just died this is very risky. I could flood my engine anytime when I start the car in winter.
does anyone has the same problem?
by working on it, I found more and more interesting differences, and I thing that is helpful to have a table to list all parts between the two, and which is interchangable, which is not. I am sure a lot people out there have j-spec under hood
#14
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Re: ecu
Originally posted by fong
sure, but ECU is tuned to run on " higher octane gas", but the motor isn't. sure it can run with our gas. but when you swap the JDM ecu into your car, I am sure that it won't run smoothly. I tested it.
sure, but ECU is tuned to run on " higher octane gas", but the motor isn't. sure it can run with our gas. but when you swap the JDM ecu into your car, I am sure that it won't run smoothly. I tested it.
The differences between the US and Japanese ECU's is all to do with emissions and differences in equipment (that's why it wouldn't run perfectly). But they're not tuned to run only high octane gas. Jap-import FC's run fine on the pump gas over here, but other imports that are specifically recommended by the manufacturer to run on 100-octane gas do sometimes have problems.
#15
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Originally posted by NZConvertible
Not mine, just an empty hole in the side of the BAC...
Not mine, just an empty hole in the side of the BAC...
#16
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Originally posted by HWO
i have a pair of BAC valves sitting here with the numbers n318 1383000 0140 on them and they have the adjustment screw on them, i have seen a couple of BAC valves on others cars which have a cardboard like cap thingy over top of the screw.
i have a pair of BAC valves sitting here with the numbers n318 1383000 0140 on them and they have the adjustment screw on them, i have seen a couple of BAC valves on others cars which have a cardboard like cap thingy over top of the screw.
#17
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I belive an NA to turbo conversion is only really worth it on a convertible. Finding a T2 as a good starting point makes much more sence. I know this from personal experience helping Brad with the rear end and tranny swap from a T2 to his convertible. Turned me off for doing the swap on my NA (R.I.P)
#18
Re: Re: ecu
Originally posted by NZConvertible
Um, you tune an ECU to run a particular octane, you don't tune the motor...
The differences between the US and Japanese ECU's is all to do with emissions and differences in equipment (that's why it wouldn't run perfectly). But they're not tuned to run only high octane gas. Jap-import FC's run fine on the pump gas over here, but other imports that are specifically recommended by the manufacturer to run on 100-octane gas do sometimes have problems.
Um, you tune an ECU to run a particular octane, you don't tune the motor...
The differences between the US and Japanese ECU's is all to do with emissions and differences in equipment (that's why it wouldn't run perfectly). But they're not tuned to run only high octane gas. Jap-import FC's run fine on the pump gas over here, but other imports that are specifically recommended by the manufacturer to run on 100-octane gas do sometimes have problems.
#19
Originally posted by HWO
i have a pair of BAC valves sitting here with the numbers n318 1383000 0140 on them and they have the adjustment screw on them, i have seen a couple of BAC valves on others cars which have a cardboard like cap thingy over top of the screw............
i have a pair of BAC valves sitting here with the numbers n318 1383000 0140 on them and they have the adjustment screw on them, i have seen a couple of BAC valves on others cars which have a cardboard like cap thingy over top of the screw............
any one knows that what exact number on AFM for 89+ TII? I put a N370 AFM on this j-spec engine, and it just won't start. but engine runs with N350 n/a. but the boost sensor is N370. just wonder
#20
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Hmmm.. I got the COMPLETE jspec swap from japan meaning all jspec electronics, sensors, and engine, except TPS. I noticed the ECU is N374 but the AFM and boost sensors are N370. My BAC also has N370 and the adjustment screw. I didn't really notice there is much of a difference. My car starts fine when cold, now flooding here.
#21
Originally posted by turboGXL
Hmmm.. I got the COMPLETE jspec swap from japan meaning all jspec electronics, sensors, and engine, except TPS. I noticed the ECU is N374 but the AFM and boost sensors are N370. My BAC also has N370 and the adjustment screw. I didn't really notice there is much of a difference. My car starts fine when cold, now flooding here.
Hmmm.. I got the COMPLETE jspec swap from japan meaning all jspec electronics, sensors, and engine, except TPS. I noticed the ECU is N374 but the AFM and boost sensors are N370. My BAC also has N370 and the adjustment screw. I didn't really notice there is much of a difference. My car starts fine when cold, now flooding here.
any one know why?
#23
Originally posted by RHDturboII
Mine is an 89 TII RHD and the ECU number is N380. The pump gas here is 98 octane.
Mine is an 89 TII RHD and the ECU number is N380. The pump gas here is 98 octane.
where are you? I mean why your gas is 98? how does it compare with 93 in US here.
anyone knows any differences between 88 BAC and 89+ BAC? can we interchange them, regardless the number?
#25
Lives on the Forum
Yep, US specs on octane is an average of Research and Measured octane numbers.  Research is always higher; measured is always lower.  Most countries outside of the US use Research octane numbers which looks really inflated to most US folks.
-Ted
-Ted
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