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ID1300x injectors or ID1050x injectors???

5.1K views 16 replies 9 participants last post by  Fleabag11266  
#1 ·
Hey Y'all. I'm looking into throwing some mods on my 2021 GT500 and getting a flex tune of E85 and 93 by Lund on a RTD+ Device.

Heres my Mod list:
JLT Intake
V2 Shifteck Off Road Cat Delete Mid Pipes
Lethal Performance X-Pipe Resonator Delete
Divison X Billet High Flow Fuel Rail Kit
Griptech 2.75 Pulley + Belt (Undecided on size)
ID1300x injectors or ID1050x Injectors (Undecided)
Forced Inductions Stage 1 Interchiller System

So heres my questions. Will the 1050x injectors be able to run full E85 with my pulley size safely or is it best to get the 1300x injectors? I don't really want to spend an extra $900 on the 1300x and looking for 870-950 WHP range on flex. What pulley size should I get instead so I can still use the 1050x injectors and get close to my wanted power range? I could buy 2 smaller pulleys from Griptech, one thats small enough to run 93 safely and then when I want to run E85 I can change it to a smaller one than that and change the tune with the RTD device. I just don't want to go through changing pulleys all the time for my desired power and really just want to use the 1050x injectors with the 2.75 pulley to run full E85. Is changing the Griptech pulleys require to remove the pulley shaft or can I unscrew it and then screw the new one on?

I know I asked a lot of different questions on here lol but whatever I should change let me know cause I want the build to be made to my desire in a safe manner where I don't have to live on the edge and worry all the time.
 
Discussion starter · #4 ·
If it were me, I'd go 1300. What most people don't realize is that the a/f ratio for ethanol uses 35% more fuel by volume than gasoline. You might get away 1050x it using a 2.75", but I'd go for the extra headroom, because you'd be on the high end of duty cycle. If you were running strictly gasoline 1050x would be adequate.
do you think I could get close to 900 WHP or maybe high 800's WHP on 1050x injectors + Strictly 93 pump gas on that 2.75 Upper Pulley?