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Working on a GMPP 454 LSX with matching GMPP E67 ECM and it has a bad idle surge. Surging a few hundred RPM, mostly shortly after start up when it transitions from cranking to running. Looks like timing is the main culprit, but it affects everything else.
Engine should run mid-9s. To that end, Parker says his engineers targeted camshaft lift below the 0.750-inch threshold and kept engine speed to 7,100 rpm. When it came to validating the engine’s dependability, the engineers used and electric dynamometer to simulate quarter-mile racing.
11 gru 2010 · It’s official: The new LSX454R from GM Performance Parts is the most powerful crate engine ever offered by the General. Rated at “750+” horsepower by GMPP, the real number is somewhere near 800, and there’s still room for more because the engine was designed with nitrous or boost in mind.
17 kwi 2012 · If you want the full-boat GT454, complete with the bad-boy GMPP LSX454 and all of the performance upgrades to go with it, look at tacking on an extra $36,999 to the price of your new truck. The Full GT454 Package Includes: Powertrain: Chevrolet Performance LSX454 Crate Engine; Dyno Tested 626 hp @ 5800 RPM / 628 ft lbs of Torque @ 4500 RPM
10 cze 2010 · Now GM Performance Parts has created what it calls the 21st century 454: A Gen-IV-based engine displacing 454 cubic inches but using a modern aluminum block and cylinder heads. The foundation of the LSX 454 is a GMPP LSX Bowtie block, which, like all LS-type GM V-8s, uses six-bolt mains; it’s also filled with an all-forged rotating assembly.
11 gru 2010 · It’s official: The new LSX454R from GM Performance Parts is the most powerful crate engine ever offered by the General. Rated at “750+” horsepower by GMPP, the real number is somewhere near 800, and there’s still room for more because the engine was designed with nitrous or boost in mind.
This durable iron-block casting is based primarily on GM's production LS7 block, but designed with more material in key areas – including thicker deck and bores – to support displacements of 454 cubic inches or more, and unique six-bolts-per-cylinder-headclamping capability that enables forced-induction and nitrous combinations of greater ...
