jdm 7mgte more power than usdm gte?????????

cre · 11-13-2009, 07:01 PM

Okay, I'm now somewhere where I can add a little bit of info to this.

The JDM 7M's use a Lamda sensor (also called an O2 sensor) the same as the USDM. The ECU uses this sensor to monitor and maintain an air to fuel ratio of 14.7. Given that the JDM ECU would actually have to pull timing any time that the EGR system is active the JDM 7M would make less power. Now, at WOT the ECU does not refer to the Lamda sensor and returns to the base fuel maps. If the maps are the same then the JDM would now make the same amount of power as the USDM engine. The JDM engine may be tuned differently across the board, but there's not really any more power to be made without a boost controller. There may be significant differences in responsiveness and that combined with the timing differences may result in very slightly different power curves, but the peak power will remain roughly the same.

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11-13-2009, 07:01 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Okay, I'm now somewhere where I can add a little bit of info to this. The JDM 7M's use a Lamda sensor (also called an O2 sensor) the same as the USDM. The ECU uses this sensor to monitor and maintain an air to fuel ratio of 14.7. Given that the JDM ECU would actually have to pull timing any time that the EGR system is active the JDM 7M would make less power. Now, at WOT the ECU does not refer to the Lamda sensor and returns to the base fuel maps. If the maps are the same then the JDM would now make the same amount of power as the USDM engine. The JDM engine may be tuned differently across the board, but there's not really any more power to be made without a boost controller. There may be significant differences in responsiveness and that combined with the timing differences may result in very slightly different power curves, but the peak power will remain roughly the same.