ECU's
 

What is the differnece in a JDM P13 to USDM p13 ecu. I dont have a jdm motor I have a USDM H22a4 motor. Is there any differnce in which ecu I use. Sorry if this is a dummmm question. But there are always more jdm scu for sale then usdm.

The jdm p13 has a rev limit of 8200 but it also has a speed governer at 120. The usdm p13 has a rev limit of 7500 but it has no speed governer. The jdm is suposed to have better fuel maps and such but i couldnt really tell that much of a diffrence between them(i have a few friends with h22a swaps), the jdm also switches vtec over at a diffrent point than the usdm, which is 4500 in the usdm, but i dont know where that is in the jdm. I personally have the JUN reprogramed ecu in my car which has a rev limit at 9600(internally stock h22a's cant rev that high which mine is but i did hit 9100 the other day on accident because someone messed with my shift light, but thankfully nothing happend to my engine). In my accord i have the usdm h22a1 and i have had countless people tell me that my vtec hits and pulls harder than any other car they have been in. But it never did that until i put that JUN ecu in it.