so now that i have started my swap, i have been doing a lot of research and i figure i would make a thread with some about the differences in JDM turbo motors. first off the 20H 20R 206 and 208 are all twin turbos. i wont be covering that.
ok here we go.
the 20G is probably the easiest to identify.
was used in
-all turbocharged legacys until 1993
-all 5 speed WRXs until 1996 and automatic WRXs until 1998
-all STis until 1996
the 20G had 3 revisions or "phases" where they made mostly valvetrain changes.
some people think the 20G didnt come with a red intake manifold. i cant say for sure but i have seen a 20G with a red intake manifold but i dont know if it was painted or OEM. i think they came in the STi. but not the WRX.
some tell-tell signs of a 20G are:
intake pipe to the turbo doesnt run under the intake manifold like on the others.
the ingnition coil is not on the center of the intake manifold like the other JDM turbo motors.
the throttle cable is on the left (drivers side in USA) and the idle air control valve is next to it.
closed deck engine
the valve covers say '4cam 16valve' with horizontal lines
coil on plug
uses the "slanty" intercooler
here are some pics to help you
notice the ingnition coil is not on the intake and the intake pipe doesnt run under the intake manifold
and here are some valve covers from a 20G.
here is one more of the 20G
next we will cover the Ej20K
EJ20k was used in the Sti from oct. 1996 to oct 1998
all of the 20Ks have:
red intake manifold (usually the red paint is pealing)
smooth valve covers
ingition coil on the intake manifold
open deck engine
the throttle cable was moved to the left side (passenger side in the US).
and the idle air control valve was moved to closer to the throttle body. (this also makes it so
not all STi intercoolers fit do to the compressor bypass valve or blow off valve.)
here is some pics of the EJ20K
then their is the EJ205
engine importers offen sell these. as a JDM motor but its actually just a USDM WRX motor. it was used in:
foresters and wrxs and stuff.
it has
coil on plug
silver intake manifold
idle air control built into the throttle body
its also an open deck block.
notice the difference in the intake manifold and the power steering pump...
ok i think you all know what a ej205 looks like.
last is the EJ207
the EJ207 actually looks like the USDM turbo motors.
its used in
all STi models with the exception of the USDM which uses the EJ257
identifing this motor is a piece of cake.
it basically looks like a USDM EJ205 but with a red intake.
its a coil on plug
red intake manifold usually not faded and chiped
intagraded IACV
semi closed deck
'STi' on the inter cooler
pic.
if you have any info to add please do.
and all this is "to the best of my knowledge"
so it might not be 100% acurate please help