shesinmyroom

Just swapped in my b16a my eg wat effect would a p30 jdm ecu effect should my car have compared to a usdm one ?

tlarimer

iTrader: (3)

USDM OBD1 P30 looks for EVAP purge solenoid, so if not present it will throw a CEL
JDM OBD1 P30 doesn't look for EVAP purge solenoid
I didn't notice any notable effects when switching between the two ecu's, since my car was setup to USDM spec, I just left the EVAP purge solenoid attached when I switched to the JDM P30

Deetz

The jdm ecu has a speed gov @ about 180kph. It also is designed to run a B16 with P30 pistons that have a compression ratio of 10.4:1, all usdm B16's have PR3 pistons....giving a 10.2:1 compression

shesinmyroom

Does it not also give different emissions?

94EG8

OBD1 USDM ECUs wont throw a CEL for the evap purge solenoid.

Biggest differences are the speed limiter at 180km/h like Deetz said and slightly different fuel and timing maps for different altitudes and federal emissions regulations.

tlarimer

iTrader: (3)

I stand corrected, I thought for sure OBD1 monitored the EVAP code 92, but thats on OBD2 vehicles.

Red_Army

the usdm one doesn't have a speed limiter?

weird. thought i had a jdm p30. since i don't stop at 112 mph. oh wells.

Deetz

you sure it was jdm? You know they are smaller in size...so they look different

Red_Army

not exactly. i have a picture of the differences. i'll have to take it out and take a gander. no biggy.

Deetz

So do i, they are easily different in size as mentioned