
Originally Posted by
Alucard
Doing a live ECU scan, I found that the ECU was pushing the RS fuel pump to match the fuel level the new EJ25D demanded over the EJ22D. 6.5% over what was seen as acceptable. Could even smell the hydrocarbons. Lol. Knowing that I had to get it back down to 0%, I installed a Walbro 255lph fuel pump I got for my birthday (9-15) and adjusted fuel pressure exactly 2psi up from the stock factory rating, which the ECU was content with and neither added nor subtracted fuel.
I also ported the throttle inlet and slimmed the throttle body plate on the inlet side to have the edge of a sharp kitchen knife. Throttle response is nicely quick. Enough to make this already-fun-to-drive GT wagon just about addictive to throw into and pull out of corners with an authority EJ25D's are just not supposed to have. As it is right now, this EJ25D is probably as perfect as I believe an N/A EJ25 hybrid CAN be so I won't seek more power.
In fact, I restored the previously removed snorkus and made the hybrid intake proper once again. Doing so increased the response on the low end a bit more whereas the snorkus had zero effect on this particular EJ22D (which is why it was removed to begin with/the ECU didn't register any detriment). I also reduced the copper spark plug gap down to .030. Everything I had done brought this EJ25D as close as I can to being as responsive and reliable as I can get it to be.
It's got almost 3000 miles on it already and runs like a peach, which I find hilarious because my last attempt at this kind of project for the EJ25D did not end well (to be fair, high speed runs on small oil pumps or blocks with diminished internal integrity never turn out well). For now, I'm just going to enjoy it and improve on the car more for it to be a competitor at Lime Rock Park's in-field.