Yes, it does matter. Every time you switch from e85 to 93 and vice versa there is varying amounts of the previous fuel left over. This is going to give you inconsistent fuel which in turn throws the fuel tune off. I know from experience.

Your ecu does not run in closed loop at wide open throttle.

 

Then you do it your way I'll do it my way. And fyi my ecu doesn't run closed loop at all. I have no issues with drivability what so ever so whatever man I know what works

 

If your ecu never runs in closed loop, than it doesn't use fuel trims.

Apparently you don't know what works, Tom at tscomp tuned your car.

 

Obvioiusly I know that trims are based off injector scaleing. If injectors are scaled correctly shouldnt matter am I wrong?

 

And yes Tom did tune my car, and yes we did do fuel trims when we did injectors and reguardless of what fuel I use they don't change much.

 

Talked to Tom...Basicly what I got from him was I Need 1000cc Injectors(I want this size dont need but want) a walboro 255(Should be big enough???) EvoScan to log my data once I have a working laptop again, This Grimmspeed 3 port ECU boost solenoid so its getting accurate readings, A better Wideband, ECUFlashed w/ tephra V7, and I should be all set? anyone want to correct me if im wrong on god forbid i missed something else i have to buy....thanks yet again guys...this is going to be a headache i can feel it


Edit: Do I need this Tactrix cable and openport 2.0 thing also? Im new to the Tuning aspect of the 4g63...I just want to know WTF I have to buy LOL someone make me a list please LOL thank you

 

Good read so far, good info!