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I am looking at a new engine for my car and it happens to be a Japanese spec. engine. I was wondering if anyone could tell me any differences in the engine. Thanks!
 

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430cc j-spec
540cc export

i believe
 

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although it does have vvti, its rated at 280hps vs 320hps. Plus if it has smaller injectors, there is less fuel needed. Hence lower horsepower.

leonard
 

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yeah...less fuel needed...but more importantly, less upgrade potential, as im sure u know more boost=more air, more air requires more fuel

430's only push out...well...430...and 540's..well..u can figure out the rest.
 
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Hi...

Plenty of these in the UK, so here goes

1. No EGR system.

2. Smaller Injectors - no coil packs

3. MAF not MAP sensor

4. Ceramic Turbo's

5. Downpipe - turbo flanged is changed

6. ECU matched to smaller injectors

7. Smaller cams (both)

8. Traction control changed - no TRAC pump

9. VVTI on later cars

The 280 hp figure quoted for the j-spec car not reflective of it's actual HP. In Japan car manufacturers are not allowed to quote a higher figure than this.

UK owners have done back to back dyno comparions between UK/US spec and J-spec cars and the RWHP figures have been very close. What is different is the way that the power is delivered, the j-spec turbos spool faster and 0-60 times are regarded as quicker whereas the steel turbos of the UK/US cars are better at the top end.

Boost levels in excess of 17/18 psi are really not recommend with the ceramic blade turbo's.

There are J-spec Supra's in the UK with HKS twins, single turbo's or uprated stock turbo's........no problem with upgrades other than a few more $'s in correcting cams and fuel issues.

regards...................
 
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KansaiSupra said:
although it does have vvti, its rated at 280hps vs 320hps. Plus if it has smaller injectors, there is less fuel needed. Hence lower horsepower.

leonard
The later vvt-i ones are rated at 310hps, as opposed to the earlier 280 ones
 

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I just plopped a Jap spec motor in my MKIV and would not recommend it. The throttle body and intake manifold are bit more different than you think. I am running into all sorts of problems and thinking about changing them both to US spec parts.

Make sure you get a Supra motor not just a JZA-80. There are many other cars that use this block, but have totally different oil pans, and many other parts! Don't be fooled or talked into any other setup.

Since I already was going to upgrade the cams and injectors, those weren't so much the issue. These engines are normally cheaper to acquire, but in the long run I am not finding any cost advantage since you'll need to buy parts for it. Yeah, not having the EGRs is nice, but $4 worth of steel to make block off plates can fix that in a minute.
 

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Discussion Starter #11
Thanks for all the help!! I was going to buy a Jap spec motor that I found but will now hold off to find a US one.

Thanks again
 
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Hey, guys I got a jap motor with sequential CT20A turbos on them..it is also a 2jz-gte..anyone fimiliar with this motor..and any specs?
 
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SurMkiv said:
Hey, guys I got a jap motor with sequential CT20A turbos on them..it is also a 2jz-gte..anyone fimiliar with this motor..and any specs?
CT20a's are found on aristos, which also uses the 2jzgte. CT20A's are marginally smaller than the CT12B by some 5mms. Thus, they flow less.
 
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ianong said:
CT20a's are found on aristos, which also uses the 2jzgte. CT20A's are marginally smaller than the CT12B by some 5mms. Thus, they flow less.

Oh..are you sure it does look bigger than the ct12 on my friends supra.
Do you know the cfm flow on the CT20A.
How much horses are we talking about?
 
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