Hello,

So I have a 2003 Evo 8 with the Utec. I was running 660CC injectors 2 weeks ago, so in the utec, I wrote in 660cc for injector flow, and I wrote in 660cc for stock injector flow since my stock ecu is flashed and is set up for 660cc. So, so far what I'm doing is fine correct? Ok, so 2 days ago I got 780CC injectors because i was topping out my 660's, so I wrote in 780cc for injector flow, and left the 660's in the stock ecu injector flow since i didn't touch the stock ecu and it's stilll set up for the 660's. So is this fine to do, or do I need to do something else? Because my car has been running like crap after I put in these injectors and wrote in 780CC for the injector flow. My car is trying to die on me when I'm rolling to a stop in neutral or when just putting the car in neutral and letting the rpm's fall, the car tries to die, and the air/fuel ratio becomes VERY rich about 10.5 during this time that it tries to die on me and then after about 3-4 seconds, the rpm's jump up, and then go back to normal. Anything I should change that I wrote in the utec or anything???? Thank you

 

The injector latency is off. You can set the UTEC back to the way you had it with the 660's it should run. You might want to have the ECU reflashed for the bigger injectors. Have them flash the ECU with better injector battery voltage latency. Maybe have them scale the injectors for you. That way you can leave the UTEC scaling 1 to1 for ex. 680 to 680. If the ECU was completely stock you could use the UTEC for all the scaling but if it's been flashed it just complicates things to much. This is a link for scaling injectors with the ECUFlash program. https://www.evolutionm.net/forums/sh...d.php?t=207924