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Old 06-19-2013, 11:25 AM   #1
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L83 5.3L V8 Gen V direction injection engine images

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.

The 2014 C7 Corvette will get a 6.2L version of this engine (dubbed the LT1) and I am sure the Camaro will end up with versions of this engine as well so I thought this might be of interest to Camaro5 forum members.

I will use this thread to post some pictures of the L83 related engine components and then also the performance testing results (dynamometer and acceleration testing) from the vehicle. The 2014 Silverado performed very well compared to the previous generation Silverado so this should be a good sign for the next generation powertrain in the Camaro.

Here is a link to a YouTube video of some of the testing and results as well (think of the video as the Cliffs Notes version of this thread):

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Old 06-19-2013, 11:27 AM   #2
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Crankshaft related images

Here is an image of the L83 Gen V V8 engine cast iron crankshaft. 92mm (3.622") stroke, just like the previous engines. Weighs 53.8 lbs.



And here is the same crankshaft next to a Gen IV V8 crankshaft:

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Old 06-19-2013, 11:28 AM   #3
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I am looking forward to this engine, since the current 5.3L is highly modable and they can be beasts!!
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Old 06-19-2013, 11:28 AM   #4
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L83 camshaft

Here is an image of the Gen V V8 L83 camshaft next to a Gen IV camshaft (extra lobe that is wider than the others is at the back of the engine and drives the high pressure fuel pump):

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Old 06-19-2013, 11:39 AM   #5
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Silverado engine compartment

Engine compartment with L83 engine:



with intake removed but sound deadening material still over injectors and rail:



with sound deadening pad removed, showing injectors and rails and valley tray:



thermostat housing and engine coolant temperature (ECT) sensor now mounted in water pump assembly (no longer in cylinder head):

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Old 06-19-2013, 11:40 AM   #6
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Very cool that you guys did gasoline versus E85 test runs, as these things are rated about 25 to 30 HP/TQ higher on E85. The dyno appears to show this difference as well. (I'm assuming the dyno results you have are just HP and not TQ?)

Can you not get a TQ reading? Apparently on E85 the TQ is rated at 416 which is pretty incredible. These new engines are going to be making some killer power. I'm betting the 6.2 will do 480 - 500 TQ on E85 with the stock tune.

Thanks for posting this.
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Old 06-19-2013, 11:41 AM   #7
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Vacuum pump

The L83 truck engine runs a belt driven mechanical vacuum pump in order to generate vacuum for the brake booster. The C7 Corvette will likely get an electric pump. I assume the Camaro will also go electric.

Here is an image of the pump (attached to the block on the driver side low in the accessory drive):



Image of vacuum line that goes from the pump to the brake booster:

http://www.lingenfelter.com/LPEforum...0&d=1371590957
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Old 06-19-2013, 11:42 AM   #8
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MAF sensor

The L83 engine runs an eight wire mass airflow (MAF) sensor. Gen IV engines had a five wire sensor with two wires are for the intake air temperature and 3 wires are for the mass airflow. The added three wires are for a humidity sensor.

Here is an image of that sensor in the Silverado duct work (passenger side):

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Old 06-19-2013, 11:47 AM   #9
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DI fuel pump

The L83 runs a mechanical fuel pump off of an extra lobe on the camshaft. The pump is mounted at the back of the engine in the valley. The pump is fed low pressure fuel by a PWM controlled electric fuel pump mounted in the fuel tank.

Here is an image of the mechanical DI pump as it sits in the valley of the engine:



During testing of the vehicle, we recorded fuel pressure levels in the high pressure side of the system of 425 psi to 2200 psi.

Fuel pressure in the low pressure (lift pump) side of the system ranged from around 40 to 90 psi averaging between 46 to 55 psi depending on the test.
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Old 06-19-2013, 11:48 AM   #10
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E92 ECM

Here is an image of the E92 ECM mounted in the vehicle.



Note the added security measures installed on the ECM (aka plastic ZIP tie). Ours no longer has a ZIP tie.

Here is an image of the new E92 ECM next to an E38 ECM (the ECM used in the 2007-2013 CK trucks) for comparison:



More inputs and outputs (I/O) and the E92 has the built in high voltage drivers for the direct injection injectors.
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Old 06-19-2013, 11:50 AM   #11
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2014 Silverado 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.

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Old 06-19-2013, 11:51 AM   #12
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2014 Silverado 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

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Old 06-19-2013, 11:54 AM   #13
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Stock 2014 Silverado vs stock 2010 Silverado

Here are some acceleration testing results compared to a stock 2010 Silverado 5.3L 4WD truck.

Both are 4WD, both have the 5.3L engine, both have the 6L80 transmission. The 2014 has a 3.08 and the 2010 has 3.42 axle. The 2014 is a crew cab, short bed. The 2010 is an extended cab, standard bed.

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Old 06-19-2013, 11:55 AM   #14
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2014 Silverado 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.

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Old 06-19-2013, 11:56 AM   #15
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2014 Silverado 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.

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Old 06-19-2013, 12:02 PM   #16
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Saw this on LS1tech Can't wait until we see more and more!
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Old 06-19-2013, 12:31 PM   #17
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Thanks for the great information! It all sounds very similar to the LFX V6. Flat torque curve, high pressure fuel pump ran off of cam lobe, and great E85 gains are all the benefits of cam phasing and DI.

This engine on E85 in the Camaro would give the current L99/LS3 a run for the money. The 6.2 should be a real killer.
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Old 06-19-2013, 12:39 PM   #18
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Thanks so much for doing this ! I really like the numbers for this engine.
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Old 06-19-2013, 03:30 PM   #19
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very interesting.
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Old 06-19-2013, 10:59 PM   #20
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Looking forward to the LT1 making it into the Camaro.
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Old 07-07-2013, 09:01 PM   #21
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Quote:
Originally Posted by jrh@lpe View Post
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.
Like a bit of gas ever stopped a seasoned wine-o.



(appreciate the info BTW!)
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Old 07-08-2013, 07:44 AM   #22
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Too bad this engine didn't help GM in the grand scheme of things as the 2014 Truck Tests are out. That and I don't see whyt people are so excited for the 6.2 as it's damn near 100% carry over from 2013.
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Old 07-12-2013, 07:41 AM   #23
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Originally Posted by Cody6.2 View Post
That and I don't see whyt people are so excited for the 6.2 as it's damn near 100% carry over from 2013.
No one is overly excited about the 2014 6.2... this pertains to the future inclusion of the LT1 in the Camaro line and in the new '14 'Vette which is absolutely NOT 100% carryover.
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Old 07-12-2013, 08:57 AM   #24
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this is pretty interesting! thanks for posting!
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Old 07-13-2013, 04:07 PM   #25
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Originally Posted by Cody6.2 View Post
Too bad this engine didn't help GM in the grand scheme of things as the 2014 Truck Tests are out. That and I don't see whyt people are so excited for the 6.2 as it's damn near 100% carry over from 2013.
The new di 6.2 only shares 2 or 3 things with the old pfi 6.2.
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