Beginner/Budget 5.3 Mods For More HP?
Apr 29, 2020 | 07:54 PM
#12
Teching In
Joined: Dec 2013
Posts: 9
Likes: 2
From: Central Ohio
I have the L59 which is the FF version of the LM7 in that series, 02-07, check your RPO code to be sure. My mail order tuner had no problem with stock FF injectors, a nice mild lope at idle and a great running engine on 87. I can pull 19 mpgs out of my daily 60+ mile round trip for work. I did a full rebuild, along with parts in sig I replaced springs, lifters, oil pump, chain. I put a Magnaflow in place of the oem muffler, an Airaid tube on the stock box with a KN. I would not hesitate to drive it anywhere, the chassis has 248k mi., engine has about 50k. That Summit deal gets you just about all you need for the price of only a cam at other places.
Apr 30, 2020 | 07:13 AM
#13
With my small Tick TowMax2 Truck Cam I was not maxing out the stock injectors. It had a slight lope and sounded good. LS3 springs were fine for any RPM you'd see on a truck. So that would be a "cheap" upgrade. But by the time you add in gaskets fluids other parts and the tune it is always a lot more expensive than it sounds. +1000 easy.
Apr 30, 2020 | 12:55 PM
#14
The 50lb/hr Flex injectors are from a 2010 Silverado (part number 12613412) will work but they need Multec to EV6 adapters to connect to the engine harness. I'm running those injectors with no issues. Careful who you buy the injectors from as a lot are Chinese knock off junk.
The tuner will need to scale the injector data from GEN 4 to GEN 3. If you're only doing a small cam and exhaust you may be able to use the stock injectors, but they will be near the end of their duty cycle with zero room to grow. IIRC the stock 25 lb/hr injectors are good somewhere between 300 to 380 hp... there are online calculators that will help with injector sizing.
As far as tuning... PCMofNC out of Mooresville, NC can tune the truck. When I called a couple years ago they said I'd need an upgraded driveshaft to be allowed on their dyno. They did say street tuning would be no problem. Another local with a good rep is LSX Performance in Indian Trail, NC.
I wound up just buying HP Tuners to correct a mail order tune.
The tuner will need to scale the injector data from GEN 4 to GEN 3. If you're only doing a small cam and exhaust you may be able to use the stock injectors, but they will be near the end of their duty cycle with zero room to grow. IIRC the stock 25 lb/hr injectors are good somewhere between 300 to 380 hp... there are online calculators that will help with injector sizing.
As far as tuning... PCMofNC out of Mooresville, NC can tune the truck. When I called a couple years ago they said I'd need an upgraded driveshaft to be allowed on their dyno. They did say street tuning would be no problem. Another local with a good rep is LSX Performance in Indian Trail, NC.
I wound up just buying HP Tuners to correct a mail order tune.
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