681 HP and 617 LB-FT Supercharged LS3 Crate Engine - Twisted LS3

Chevrolet Performance Crate On Boost

Jake Amatisto Jul 11, 2014 0 Comment(s)
View Full Gallery

If you’re looking for a crate engine for under ten grand, Chevrolet Performance’s LS3 is a solid foundation. At $8,567 (Summit Racing), you get a ton of parts that aren’t typically included with other crate engines, such as coil-on-plug ignition, fuel injectors, flexplate, water pump, and other items that make it ready to drop into your hot rod. Introduce a power-adder like a supercharger to it and you can have one wicked-fast, highly efficient modern engine that can pump out loads of horsepower. Case in point: our Chevrolet Performance LS3 engine we’ve been playing with over the past year. Basically, we combined three part numbers (PN 19301360 for the LS3, PN TS9008-2.8LC for the blower, and PN 554-114 for the EFI) and turned our stock LS into a 680-plus-hp pump gas fueled monster, and that’s without even touching the insides of the engine.

This month we trekked our LS3 down to Westech Performance Group in Mira Loma, California, to put Kenne Bell’s 2.8L supercharger and Holley’s Dominator fuel injection to the test. This engine will be the base for a 416ci stroker engine in the future, but for now we wanted to see what we could get out of Kenne Bell’s smallest supercharger. The 2.8L twin-screw blower is the base model for a stock fifth-gen Camaro, so if you’re in the market for one, this is a good example of the kind of horsepower you can expect (at the crank) and still drive your Camaro every day if you want to.

Kenne Bell offers three blowers for GM’s LS line of engines: the 2.8L, the 3.6L, and the 4.2L – an even larger blower is in the works for serious race applications. Each supercharger can be ordered with a liquid-cooled front bearing case option that’s separate from the intercooler system. This $300 option essentially cools down the front bearing in the case, which increases power and rpm potential.

The third component in this combination is Holley’s Dominator EFI system. This setup has near limitless capabilities and its simplified interface makes tuning a breeze. When it comes to tuning or data logging, the Dominator does it all, and what’s cool is we’ll be able to use this setup in all the stages of the engine as it progresses. With Westech’s Eric Rhee at the keys, we coaxed our powerplant to make impressive steam on California’s winter blend of 91-octane fuel.

Kenne Bell’s 2.8LC Twin-Screw Supercharger

Kenne Bell Supercharger 2/20

  • Silent operation
  • Rear inlet manifold accepts large throttle bodies
  • Large 4x6-inch rotors for more hp potential
  • Integral intercooler

Chevy’s 6.2L LS3 Crate Engine

Chevy Ls3 Crate Engine 3/20

Chevrolet Performance’s LS3 is a 6.2L (376ci) V-8 that features 10.7:1 compression from hypereutectic pistons, a nodular iron crankshaft, a cast aluminum engine block, and powdered metal connecting rods. It’s also equipped with a hydraulic roller camshaft that has 0.525-inch valve lift and 226/236 degrees of duration at 0.050.

Parts include:

  • Ignition coil packs
  • Spark plug wires
  • Spark plugs
  • Intake manifold
  • Fuel injectors
  • Throttle body
  • Exhaust manifolds
  • 14-inch flexplate
  • Front timing cover
  • Aluminum water pump
  • Harmonic balancer
  • Passenger side, right-hand dipstick and tube

Holley’s Dominator Vehicle Management System

Holley Dominator Efi 4/20
Holley Dominator Wires 5/20

There were many reasons why we went with Holley’s top-of-the-line EFI system on our LS3 engine. The main reason was that as the engine progresses, it will allow us to easily change and data log the various tune-ups the engine will see. The Dominator’s comprehensive interface makes adjusting engine parameters a breeze and we’ll definitely need to adjust the tune once we go with E85 fuel. We’re running some pretty large injectors on this engine, 220-pounders, because at one point we’ll be putting a larger Kenne Bell supercharger atop of this engine (once it’s stroked) and seeing what kind of power can be had from GM’s latest small-block with even more boost from a twin-screw. The Dominator is much more than a standalone EFI system; Holley calls it a “Vehicle Management System,” which is accurate because it can do so much more than just control fuel. The Dominator can control coil-on-plug ignition, multiple progressive nitrous systems, and it even allows for control over transmission features. If you want to be really trick, the Dominator can be ordered with a full-color LCD touch screen (PN 553-103) that eliminates the need for a laptop computer.

Features include:

  • Plugs into factory GM 24x and 58x LS engines
  • Integrated electronic transmission control (4L60E and 4L80E)
  • Integrated dual-channel wideband oxygen sensor controls
  • Integrated drive-by-wire throttle body control
  • Four-stage progressive nitrous oxide controller
  • Turbo boost control
  • Internal data logging standard with 2 GB of memory
  • Store and change between four calibrations
  • Individual cylinder fuel and spark control
  • Plus much more


Ls3 Crate Engine Turn Key Brackets 6/20

1. We have to give major props to Turn Key Engine Supply in Oceanside, California, for providing all the brackets and accessories for this project engine. We will be using them on this and the next incarnation of this powerplant, when we bolt up the larger 3.6L Mammoth supercharger to our stroker LS3.

Ls3 Crate Engine Coil Pack 7/20

2. We actually upgraded a few things on the crate engine before we started the dyno tune, the ignition system being one of them. First, the coil pack brackets must be removed.

Ls3 Crate Engine Spark Coils 8/20

3. Performance Distributor’s Sultans of Spark were chosen for the coils on our blown LS3. The hotter spark from these coils will more effectively burn the mixture that’s forced in from the supercharger.

Ls3 Crate Engine 90mm Throttle 9/20

4. We used a 90mm throttle body from Kenne Bell on this project. However, the manifold itself can house nearly any throttle body combination you can think of.

MORE PHOTOS

VIEW FULL GALLERY

COMMENTS

subscribe to the magazine

get digital get print
TO TOP