8.1 truck injectors on a 5.3 and boost?
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02-18-2006, 11:27 AM
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Well with stock 5.3L injectors and 10lbs of boost I was turning with them, I blew the tips slap off the tip of the injectors and washed my rings. They can't handle the fuel pressure you will half to run. I've been running 8.1L 38lbs injectors and they have been doing good.
02-20-2006, 03:43 PM
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Originally Posted by MrXerox
38lbs? You mean the marine ones? I thought those were 42?
I run a Vortech blown 5.3L with GM 8.1L Marine injectors and 12PSI boost. My injector duty cycle with 5800 rpm shift points are 115-120 %. I have a walbro GSS341 in tank and returnless fuel system. My truck is being torn down right now to add a cam/stage 2 heads, and 1.85 SLP rockers. Yeah 60# siemens are going on also. I tune with HP tuners and have seen high duty cycles since going to the 3.12" pulley.(12 psi) The only way to guage your correct injector size is to log your tune. I logged a radix blown 5.3L today with a 2.89" pulley and 42# injectors. At WOT and 5500 shift points he was logging 93% injector duty cycles. He had just had a dyno tune last week and was putting out 475 ftlbs/480 RWHP. My setup will be dyno'd on Thursday and I expect to be in the 500 RWHP range with my setup. Again, I run a 58 psi returnless fuel system. If you are running a FMU fuel system then the 42 lb should get you through most whatever you do with the 5.3L Hope this helps....