Quote:
Originally Posted by Dan9
yes the ECU can be swapped over, pinout SHOULD be the same (although I swear there are like 50 different B13 versions with weird little things different between them  )
Dang I wont say anything except, if you wanna try it, I will watch. But I suspect there might be some other differences, the sensors for example, that will make the sr20 ecu freak out. |
Well I finally got around to trying it....and well......
it works just fine. For those who are new to this thread, read post #10 to see what I proposed doing. I checked pinouts for both the GA and the SR engines in the '94 factory shop manual and found that the SR20DE and GA16DE ecu's are pretty much interchangeable. The only small differences from my GA ecu to my SR ecu were that the SR ecu has a few pins that I don't have [or need] on my '89 Sentra anyway. Things like Canadian daytime running lights, A/T torque converter lockup, and A/C. Of course you lose the VTC switching with an SR ecu but that's easy to control with a simple rpm switch. Anyway, I swapped in the 259cc SR injectors, the SR air mass meter and the SR ecu into my GA16DE car. Before I change anything, I monitored the air/fuel ratio on the stock GA with a wide band so I could see what the o.e. air/fuel values were during different driving conditions. The stock GA16DE ran at between 14.2 to 14.8 pretty much all the time at cruise. Wide open throttle would see it richen up all the way to 11.8 at about 6-k. Part throttle of course, was in between depending on load.
Now with the SR components installed, the fuel curve is
exactly the same. My logic in post #10 [in guessing that they would be very close], was correct. Now I will go ahead and install my TSi turbo kit and tune from there. I no longer have the bottleneck of the 185cc injectors running out of fuel delivery at boost. I
should be able to use a simple rising rate fuel pressure regulator to richen it during boost. We shall see.
