Baseline dyno numbers for a 6.2L?

[kodiakdenali]

Has anyone run a stock 6.2 to get a baseline? I recently added a Borla ATAK catback and had a chance to get it on the dyno, the numbers seemed pretty good, 354.4 hp and 393.1 lb-ft. I did the exhaust for sound, not performance, but I'm wondering if its possible to quantify how much of a gain the Borla gave me.

[Colossus]

1 hp

[Rob Mugs]

14 hours ago, kodiakdenali said:

Has anyone run a stock 6.2 to get a baseline? I recently added a Borla ATAK catback and had a chance to get it on the dyno, the numbers seemed pretty good, 354.4 hp and 393.1 lb-ft. I did the exhaust for sound, not performance, but I'm wondering if its possible to quantify how much of a gain the Borla gave me.

Is that with the supercharger you have listed?  If so, ouch

[kodiakdenali]

4 hours ago, Rob Mugs said:

Is that with the supercharger you have listed?  If so, ouch

Nope, Those were the baseline before the blower. Only mod being the atak.

Doing the calculations it looks like the atak itself didnt gain much of anything beyond what you would expect stock.

 

[dane0254]

interested in this, I know that you don't gain much just wondering if it gained anything. If you are putting a supercharger on it, let us know what you get then. This 6.2 is pretty awesome as is, and I am very impressed by it. I love driving mine, it just feels so much better than my 5.3. I don't have to push it at all to get up and going. I know people will say there isn't much of a difference but I feel it. 

[kodiakdenali]

2 hours ago, dane0254 said:

interested in this, I know that you don't gain much just wondering if it gained anything. If you are putting a supercharger on it, let us know what you get then. This 6.2 is pretty awesome as is, and I am very impressed by it. I love driving mine, it just feels so much better than my 5.3. I don't have to push it at all to get up and going. I know people will say there isn't much of a difference but I feel it. 

I've never driven a 5.3 but I have to believe there's definitely a big difference. I actually thought the 6.2 wasn't fast enough for me, the sales guy gave me weird look when I came back from the test drive saying I wish it had more power. but sometimes it's all about perception. For some reason the Denali never felt as fast to me as it was, I think it being nearly silent had something to do with that. its much more satisfying to drive now that you can really hear it. But it doesn't surprise me that despite Borla's claims of 8-12hp (Can't remember where I read that, but it was somewhere), it didn't really add any power at all. it still makes the truck so much more fun. worth every penny.

 

but I was curious about baseline numbers because I was watching a video on youtube about the silverado called NEMSS, it was on the channel Fasterproms, later in the video (17:40) they run a stock 6.2L denali on the dyno, and come up with 350whp and 375 torque. since mine put down a bit more than that I was wondering if those were normal numbers and maybe the catback actually did add some power...or if it had something to do variations on the dyno...or whatever else.

 

here is the video if you're interested

 

[kodiakdenali]

found the claim, although it is a general what-can-I-expect kind of thing, not specific to this system or vehicle. And its certainly not a promise.

https://www.borla.com/support/faqs/

"We frequently see gains in the 8 to 12 horsepower range, sometimes much higher."

[TNTSierra]

You say it didn’t give you any power? You gained 5 HP but almost 20 ft lbs of TQ. That’s a good gain from a simple bolt on exhaust in my opinion. If you are going off of what they got

 

Yours: +5 hp and +18 TQ

Edited January 2, 2021 by TNTSilverado

[kodiakdenali]

13 minutes ago, TNTSilverado said:

You say it didn’t give you any power? You gained 5 HP but almost 20 ft lbs of TQ. That’s a good gain from a simple bolt on exhaust in my opinion. If you are going off of what they got

 

Yours: +5 hp and +19 TQ

exactly That's kind of what I was asking, are those numbers from the video typical of a stock 6.2? in which case I definitely did gain a pretty decent amount of power. or are mine more typical?

at 15% drivetrain loss would put it at 357/391. pretty close to what I got at the wheels. all just rules of thumb of course, I'm wondering if there are any other baselines out there to compare to.

if I really did gain that much, I'm very very happy with that!

[CamGTP]

The problem is that they can't dyno the truck in the correct gear or even hold gears on those trucks. Plus they didn't want to spin it so fast the driveshaft explodes. Running the truck in 3rd or 4th gear can give two different power numbers.

 

If you wanted true numbers that don't have as many variables it would need to be dyno'd in like 6th gear but that's just not possible when getting a base line on a stock truck.

 

Other things to consider are the type of dyno used, dyno correction factor and what the conditions are that day. That can be the difference between 10-20hp or more.

[kodiakdenali]

23 minutes ago, CamGTP said:

The problem is that they can't dyno the truck in the correct gear or even hold gears on those trucks. Plus they didn't want to spin it so fast the driveshaft explodes. Running the truck in 3rd or 4th gear can give two different power numbers.

 

If you wanted true numbers that don't have as many variables it would need to be dyno'd in like 6th gear but that's just not possible when getting a base line on a stock truck.

 

Other things to consider are the type of dyno used, dyno correction factor and what the conditions are that day. That can be the difference between 10-20hp or more.

Quite true. and I don't know a whole lot about all of that, but the truck did have an hptuners unlocked ECU in it at the time and I think he was able to do something in the computer to keep it in a particular gear...I honestly don't know for sure!

The dyno readouts show temperature and pressure and a computed correction factor. I can only assume the guys who designed the dyno knew what they were doing but yes, there is always some variation.

I am at a high elevation but it was cold that day (snowing pretty hard actually).

 

in the video posted above they say the same thing as what my truck had at the time, unlocked ECU, but no mods yet (on the video truck). just access and the ability to tune.

Edited January 2, 2021 by kodiakdenali

[CamGTP]

HP Tuners can only do the PCM functions right now as there is no TCM support offered. Not being able to alter the shift functions does make it challenging on the dyno because if the speed isn't right it will just downshift when you floor it and skew the data.

 

Yeah, most dyno sheets should have all the dyno data which is helpful. Knowing what the numbers in the video above are, are up in the air. If they used a different type of dyno, different correction factor and had 50 degree warmer air it changes everything.

 

I bet your colder day with a better density altitude helped make good numbers. To be at ~15% below crank numbers is really good.

Edited January 2, 2021 by CamGTP

[kodiakdenali]

I'm pretty happy!

I'm not sure what he did if anything, I didn't hear it downshift after he stepped on it.

[Rob Mugs]

I am just down the block from HP Tuners so considering on stopping by and seeing how things are coming along.  Did you have them unlock yours for tuning after adding your S/C?  

[kodiakdenali]

2 hours ago, Rob Mugs said:

I am just down the block from HP Tuners so considering on stopping by and seeing how things are coming along.  Did you have them unlock yours for tuning after adding your S/C?  

Did the ecu exchange beforehand. The first step was getting the truck running normally on the unlocked ecu. That took some work. The tuner i picked to do the job had already done a 2019, so that was one of the big reasons i wanted him to do the work. Had one small issue where one tool didnt work on the 20 which did on the 19. But he got it all sorted out pretty quickly. Be did a fantastic job on the whole project.