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Whats the wheel hp and torque of the 5.3 and 6.2?

Anon12345
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newdude Senior Enthusiast

newdude

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Not sure how the 8 and 10 speed 5.3s dyno, but the 6 speed 5.3s put down about 260-280 wheel hp depending on the dyno.  

Anon12345 Enthusiast

Anon12345

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19 minutes ago, newdude said:

Not sure how the 8 and 10 speed 5.3s dyno, but the 6 speed 5.3s put down about 260-280 wheel hp depending on the dyno.  

I went from a 6 speed 5.3 to a 10 speed 6.2 and the power difference is night and day. 

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shakenfake Senior Enthusiast

shakenfake

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Yes, especially with that 10 speed.

 

 

But yes subtract 10-20% and you got your number. Can't remember exactly but it is something along those lines

TNTSierra Senior Enthusiast

TNTSierra

Posted
Posted (edited)

5.3L is around 280ish on a lot of threads I’ve read.  The 6.2L is 350ish on most of those threads as well.  
 

the 10 speed is what makes a difference. The K2s transmission programming hindered them. They were terrible!!

The new T1s 10 speed programming is smooth, flawless, and quick shifting.

 

My 6.2L High Country 10 speed with just a Corsa Catback and S&B intake would beat my 2018 Sierra 6.2L with Gibson Catback exhaust, S&B intake, and Hypertech tune.  The transmission wasn’t tuned just motor. Back then in 2018 even Black bear performance didn’t have a transmission tune yet. That’s why I bought the Hypertech for $300 that gave it a 27 hp bump from stock. Hypertech thought with the exhaust and CAI it was around 40 HP. It was a nice handheld system for the money. 

Edited by TNTSilverado
CamGTP Senior Enthusiast

CamGTP

Posted
Posted

There are a few calculators out there for trying to get a guesstimate at wheel horsepower.

 

I plugged my numbers into one of these calculators with my 1/8th mile times I did a while ago. The first one used trap speed and vehicle weight and the other used E.T. and vehicle weight.

 

The numbers came out to be 328hp and like 290hp, if we avg that out lets say it's ~305-310hp and that seems about right. I also plugged into a calculator the numbers of 355hp horsepower at the crank and 5.650lbs. The thing said it could do a 9.23 @ 73-74mph.

 

I did my 1/8th mile in 9.8 at 72.9mph spinning off the line on a crazy muggy day on street tires. So take from that what you will.

GETGONE Enthusiast

GETGONE

Posted
Posted

Stock 6.2 10 speed with cut off muffler and flapper with 1970 miles on the truck put down 387HP and 465 LB/FT torque on a 90+ degree day with 60% humidity.

 

 

CamGTP Senior Enthusiast

CamGTP

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I could possibly believe that horsepower number though it's a little high but that torque number isn't accurate. Plus we can't get the 10 speeds in the correct gear on a dyno with the stock driveshafts and limited wheel speed. That correction factor on that dyno is a little out of whack.

Anon12345 Enthusiast

Anon12345

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5 hours ago, GETGONE said:

Stock 6.2 10 speed with cut off muffler and flapper with 1970 miles on the truck put down 387HP and 465 LB/FT torque on a 90+ degree day with 60% humidity.

 

 

Do you have the dyno sheet?

GETGONE Enthusiast

GETGONE

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29 minutes ago, Anon12345 said:

Do you have the dyno sheet?

 

2021_Silverado_Dyno.png

GETGONE Enthusiast

GETGONE

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1 hour ago, CamGTP said:

I could possibly believe that horsepower number though it's a little high but that torque number isn't accurate. Plus we can't get the 10 speeds in the correct gear on a dyno with the stock driveshafts and limited wheel speed. That correction factor on that dyno is a little out of whack.

He had problems with it holding the gear he wanted as it kept wanting to upshift so the numbers show a range.

GETGONE Enthusiast

GETGONE

Posted
Posted

Yes, muffler and flapper valve(only had one on my truck in front of muffler) and replaced with Magnaflow straight pipe. Unless you count changing the oil at 1000 miles with Mobil 1 and a Purolator Boss filter!

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