High duty cycle
03-12-2019, 10:31 AM
#1
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High duty cycle
have a set of FAST 88lb injectors in my 2012 gmc sierra 1500 5.3 with a 76mm turbo and at high rpm im reading a 110 duty cycle the truck is currently making 556rwhp. fuel pump is a walbro 450 with -8 feed and -6 return. am i out of injector? feel like they should be able to handle alot more
03-12-2019, 11:39 AM
#2
Launching!
Yep looks like you need larger ones. What’s the AFR at high RPM, does it fluctuate a lot? What PSI? Boost controller? If you see it bouncing around a bit your injectors are trying to keep up with commanded fuel and can’t. Boost controllers can bring the PSI on very quick and fuel injectors can’t keep up causing a high duty cycle and it can go lean. I would just get bigger injectors, so you have room to grow.
03-12-2019, 11:56 AM
#3
have a set of FAST 88lb injectors in my 2012 gmc sierra 1500 5.3 with a 76mm turbo and at high rpm im reading a 110 duty cycle the truck is currently making 556rwhp. fuel pump is a walbro 450 with -8 feed and -6 return. am i out of injector? feel like they should be able to handle alot more
