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2014 1500 Silverado with 5.3L L83 engine work begins

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  • 2014 1500 Silverado with 5.3L L83 engine work begins

    We recently took delivery of our 2014 Chevrolet Silverado 1500 4WD with the 5.3L L83 engine. We plan to use this vehicle as a development vehicle for 2014 based truck products and also for initial development of our Gen V V8 products since the 2014 CK trucks are the first vehicles to get the new Gen V GM direct injection V8 engines.

    Here is a picture of the vehicle. I will post additional follow up information in this thread.

    Click image for larger version

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  • #2
    Chassis dynamometer graph, stock on gasoline

    Here is a chassis dynamometer graph of the truck as we received it. This is tested on our Dynojet 248 chassis dynamometer. The abrupt end of the data is due to the factory speed governor.

    This is on gasoline (roughly 9% alcohol content according to the on-board alcohol sensor).

    307 hp at 5200 RPM and 332 lb-ft at 4200 RPM at the rear wheels. OEM rating on gasoline is 355 hp at 5600 RPM and 383 lb-ft at 4100 RPM. Power is right where it should be, especially when you take into account that this is with the 6L80 automatic transmission.

    Click image for larger version

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    • #3
      Acceleration testing results, gasoline

      Here are some of the acceleration performance testing results when tested on gasoline.

      Best on gasoline is 7.5 seconds 0-60 mph and 15.94 seconds and 90.75 mph in the quarter mile. 1/4 data is with NHRA roll-out.

      Gasoline testing was with 1/4 tank of fuel. The truck weighs 5340 lbs with 1/8 tank of fuel and no driver. This is with the vehicle fully up to temperature as you would drive it on the street.

      Truck specifications:
      4WD, short bed, crew cab, 3.08 gear

      Click image for larger version

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      • #4
        Stock 2014 vs stock 2010

        Here are some acceleration testing results compared to a stock 2010 Silverado 5.3L 4WD truck (with a 3.42 axle and the 6L80 transmission).

        Click image for larger version

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        • #5
          E85 vs gasoline testing chassis dynamometer results

          The 2014 L83 engine is rated at 380 hp on E85 (vs 355 hp on gasoline) and 416 lb-ft on E85 (vs 383 lb-ft on gasoline).

          We ran the truck down to about an 1/8 of a tank and then filled it up with E85. Pump E85 never tests at 85% alcohol since they have to dilute the alcohol itself with gasoline for transportation in order to make it no longer consumable by humans. Then we still had some fuel in the tank as well. So before switching to E85 the on-board alcohol sensor read 9% alcohol content and after switching it read 65% alcohol content.

          Attached is a graph comparing gasoline vs E85. The speed governor has been removed in order to allow us to test to a higher speed on the chassis dynamometer.

          On gasoline the peak power is 302 hp and 332 lb-ft and on E85 that increased to 321 hp and 355 lb-ft.

          Click image for larger version

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          • #6
            E85 vs gasoline acceleration testing

            Given the fairly significant increase in power for the L83 on E85, we thought it would be worthwhile to go back and retest the acceleration performance on E85 fuel.

            As expected from the chassis dynamometer data, the performance did improve.

            Impressive performance numbers for a stock 5300+ lbs truck (200+ driver and a full tank of fuel so we were over 5600 lbs).

            I did two runs on E85. They were virtually identical in performance so I didn't do any more runs since the data was so repeatable.

            0-60 mph was a best of 6.96 seconds (6.97 on the run displayed in the attached graph). This was an improvement of 0.5 seconds over the best gasoline run.

            1/4 elapsed time dropped to 15.51 seconds at 93.5 mph, for an improvement of 0.4 seconds and 2.7 mph.

            Click image for larger version

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            • #7
              Video of truck

              Here is a YouTube video of the truck:

              Last edited by Isaac@Lingenfelter; 06-20-2013, 02:38 PM.

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              • #8
                RE: E85 vs gasoline acceleration testing

                Here is some information from the 1/4 mile testing of the 2014 Silverado with gasoline and then E85. Some of the chassis dyno comparison tests were done on the same day but the acceleration tests were done on different days so they aren't exact apples to apples comparisons (see the IAT differences for example).

                The engine appears to run a little more spark (1.5 degrees peak, 1.7 degrees average) and run a little leaner (0.6 average and 0.5 peak in terms of lambda, not AFR of course). With the added fuel volume and the DI they may also be getting adding charge cooling benefits.

                Gasoline:
                9% alcohol content
                Maximum timing: 21.5 degrees
                Average for entire run timing: 17.2 degrees
                Max lambda: 0.83
                Average lambda: .79
                Max airflow: 264.7 gps
                Avg airflow: 209 gps
                Max MAP: 98 kPa
                Avg MAP: 95 kPa
                Max ECT: 107 deg C
                Avg ECT: 102 deg C
                Max IAT: 36
                Avg IAT: 34


                E85:
                65% alcohol content
                Maximum timing: 23.0 degrees
                Average for entire run timing: 18.9 degrees
                Max lambda: 0.89
                Average lambda: .84
                Max airflow: 273.6 gps
                Avg airflow: 218 gps
                Max MAP: 98 kPa
                Avg MAP: 96 kPa
                Max ECT: 102 deg C
                Avg ECT: 99 deg C
                Max IAT: 29
                Avg IAT: 27

                Also, two of four gasoline runs showed knock during the acceleration test (including the fastest run). Neither of the E85 runs showed knock during the acceleration tests (only did 2 runs with E85 since they were so similar). Interesting to note that when not at high throttle angles the ECM shows a lot of knock with either fuel.

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                • #9
                  So before switching to E85 the on-board alcohol sensor read 9% alcohol content and after switching it read 65% alcohol content.
                  Thanks for letting me on the forum. I'm an E85 advocate. Does GM put a real fuel composition sensor on or was that something you added to tell the actual % ethanol in the tank. Or was it just the computer figuring it out. I used to own a 2001 Taurus that had a real sensor but Ford did away with that a couple of years later and went to just the computer algorithm.
                  Thanks

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