jdm engine
#2
Registered User
No you will most likely fail. JDM ECUs are not OBDII spec, and they don't run the air pump assembly the same way. I learned that when I bought that fiasco of a part Challenge made to eliminate the air pump.
#5
Registered User
Oh my bad, I got that backwards, I thought you were using a JDM ECU on a USDM engine. The only difference I know of with the JDM engine is that it has a higher compression ratio, so run good gas!
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#8
Registered User
USDM engine - 11:1 compression ratio
JDM engine - 11.7:1 compression ratio
With the USDM ECU, I feel that running premium 93 octane is fine. The ECU will just retard the timing when it senses knock, so it should be safe enough, but you have to keep in mind that you are running a half-a**ed setup, so it's not going to be perfect.
JDM engine - 11.7:1 compression ratio
With the USDM ECU, I feel that running premium 93 octane is fine. The ECU will just retard the timing when it senses knock, so it should be safe enough, but you have to keep in mind that you are running a half-a**ed setup, so it's not going to be perfect.
#10
How about running a thicker head gasket, I think getting the compression ratio to 11.5 could be a good operating point.