Jump to content

New Personal Best - 2015 Sierra 6.2

slowfive0

By slowfive0
in Racing, Strip, & Track

Recommended Posts

slowfive0 Enthusiast

slowfive0

Posted
Posted

2015 Sierra 1500 cc/sb 4x4 Denali - 6.2/8 speed.

 

Very happy with this truck. It's quiet, smooth, powerful & gets amazing fuel economy!

 

It's completely stock and weighs 5700lbs. My race weight was 6000lbs. Temps today were mid-40's / 50% humidity.

 

My best pass was 13.77@99mph. Best 60 foot was 1.91.

 

Leave at 1200rpm in "4wd Auto" --- "TC" Off, then switch back to 2wd after launch.

post-137568-0-05954900-1447564488_thumb.jpeg

post-137568-0-05954900-1447564488_thumb.jpeg

post-137568-0-05954900-1447564488_thumb.jpeg

post-137568-0-05954900-1447564488_thumb.jpeg

8secpumpgasdad Enthusiast

8secpumpgasdad

Posted
Posted

That beats my 13.86 @ 98.15. My shuts off just before the end @ 98 by my spedometer. I quess yours doesn't? Do you have the max tow package?

slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted

What ambient temp was your run made on? How much do you weigh? Crew cab or double?

 

No, mine is a Denali so I couldnt get the max tow unfortunately. It has the 3.23.

 

I hit the limiter pretty hard hence the reason (I assume) it overun the 98mph limiter by 1 mph. I was thinking about that later and wondering what it would run without that stupid limiter. My guess is 13.65-13.70 at 100-101. Pure speculation on my part though ?

slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted

Thx.

 

I'm going to say yes. Because for one, If I leave it engaged longer the acceleration feels a little sluggish. I dont feel that using my normal launch technique.

 

Also, on my last pass I disengaged it literally on the launch (oops lol) and it spun a tad. The truck had already started to move out but I got a little excited and turned the knob just a few feet from the line. Probably not good for it lol.

sahls01gmc Senior Enthusiast

sahls01gmc

Posted
Posted

As if drag racing is good on any vehicle! It sounds like it does disengage, but I bet it uses a lot of "force" to do that since pressure is being applied to it.

slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted

I went back and looked at all my runs this day and I'm going to say I think it would have run 13.70-13.75 at 100 if the limiter hadn't kicked in. Pure speculation based off of prior run mphs and increments.

 

It was also interesting that hot lapping didn't seem to affect it much. Heat soak (shutting off engine for a little bit then trying to make more passes) yes. At one point I let it cool down for 2.5 hours. Went out and cut my best 60ft (1.916) but was slower et wise across the board (.022 at the 1/8 & .035 at the 1/4) then my best pass. Weird thing is the 1/8 mile mph was .33 mph higher (then my best pass) but the 1/4 mph was 1.29 mph lower. Any my best pass that day came with me pulling right back around and making another hit! Weird. Maybe tables in the computer (how much timing/fueling for a given IAT) or maybe when I released it out of 4wd auto? I don't know buts it's fun to think about it. Can't wait to do some more

 

 

What ambient temp was your run made on? How much do you weigh? Crew cab or double?

No, mine is a Denali so I couldnt get the max tow unfortunately. It has the 3.23.

I hit the limiter pretty hard hence the reason (I assume) it overun the 98mph limiter by 1 mph. I was thinking about that later and wondering what it would run without that stupid limiter. My guess is 13.65-13.70 at 100-101. Pure speculation on my part though

I went back and looked at all my runs this day and I'm going to say I think it would have run 13.70-13.75 at 100 if the limiter hadn't kicked in. Pure speculation based off of prior run mphs and increments.

 

It was also interesting that hot lapping didn't seem to affect it much. Heat soak (shutting off engine for a little bit then trying to make more passes) yes. At one point I let it cool down for 2.5 hours. Went out and cut my best 60ft (1.916) but was slower et wise across the board (.022 at the 1/8 & .035 at the 1/4) then my best pass. Weird thing is the 1/8 mile mph was .33 mph higher (then my best pass) but the 1/4 mph was 1.29 mph lower. Any my best pass that day came with me pulling right back around and making another hit! Weird. Maybe tables in the computer (how much timing/fueling for a given IAT) or maybe when I released it out of 4wd auto? I don't know buts it's fun to think about it. Can't wait to do some more

 

 

What ambient temp was your run made on? How much do you weigh? Crew cab or double?

No, mine is a Denali so I couldnt get the max tow unfortunately. It has the 3.23.

I hit the limiter pretty hard hence the reason (I assume) it overun the 98mph limiter by 1 mph. I was thinking about that later and wondering what it would run without that stupid limiter. My guess is 13.65-13.70 at 100-101. Pure speculation on my part though

I went back and looked at all my runs this day and I'm going to say I think it would have run 13.70-13.75 at 100 if the limiter hadn't kicked in. Pure speculation based off of prior run mphs and increments.

 

It was also interesting that hot lapping didn't seem to affect it much. Heat soak (shutting off engine for a little bit then trying to make more passes) yes. At one point I let it cool down for 2.5 hours. Went out and cut my best 60ft (1.916) but was slower et wise across the board (.022 at the 1/8 & .035 at the 1/4) then my best pass. Weird thing is the 1/8 mile mph was .33 mph higher (then my best pass) but the 1/4 mph was 1.29 mph lower. Any my best pass that day came with me pulling right back around and making another hit! Weird. Maybe tables in the computer (how much timing/fueling for a given IAT) or maybe when I released it out of 4wd auto? I don't know buts it's fun to think about it. Can't wait to do some more

 

 

What ambient temp was your run made on? How much do you weigh? Crew cab or double?

No, mine is a Denali so I couldnt get the max tow unfortunately. It has the 3.23.

I hit the limiter pretty hard hence the reason (I assume) it overun the 98mph limiter by 1 mph. I was thinking about that later and wondering what it would run without that stupid limiter. My guess is 13.65-13.70 at 100-101. Pure speculation on my part though

8secpumpgasdad Enthusiast

8secpumpgasdad

Posted
Posted

What ambient temp was your run made on? How much do you weigh? Crew cab or double?

 

No, mine is a Denali so I couldnt get the max tow unfortunately. It has the 3.23.

 

I hit the limiter pretty hard hence the reason (I assume) it overun the 98mph limiter by 1 mph. I was thinking about that later and wondering what it would run without that stupid limiter. My guess is 13.65-13.70 at 100-101. Pure speculation on my part though

It was mid 50's when I ran 13.86 and mid 60's when I ran 13.97. Mine is a cc 4x4 with 3.23 gears and have added a pace edwards retractable tanneau cover and bed rug. My best 1/8 mile pass was 8.872 @ 78.89. The temp is supposed to be mid 40's this Sunday so I think I will try it again.

slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted

Interesting. I went 14.07 at 96.X in mid 60 temps.

 

I can't wait to see your results in mid 40 degree temps! ? Kind of funny that a factory speed limiter could potentially hurt 1/4 mile performance. Hopefully, it doesn't impact u too much. Would love to see some 13.50's or 13.60's from a bone stock truck though!

 

Good luck

8secpumpgasdad Enthusiast

8secpumpgasdad

Posted
Posted

Interesting. I went 14.07 at 96.X in mid 60 temps.

 

I can't wait to see your results in mid 40 degree temps! Kind of funny that a factory speed limiter could potentially hurt 1/4 mile performance. Hopefully, it doesn't impact u too much. Would love to see some 13.50's or 13.60's from a bone stock truck though!

 

Good luck

Thanks. Sounds like our trucks are pretty evenly matched. A friend of mine has a Yukon Denali with a 6.2 8 speed and he ran consistent 14.0's the same night I was running 13.8s & 9's. I'm pretty sure he is heavier than me though which is why he was a tad slower. I'm trying to talk him into going Sunday to try to get a 13.

Boombastic Enthusiast

Boombastic

Posted
Posted

As I have stated in another forum,that is quite impressive. I am a bit sarcastic and do not mean to be. But my 14 Denali 6.2 ran 14.7 stock in the 1/4 and after adding a supercharger and giving it about 100 rwhp extra it ran 13.5 to 13.7 in the1/4. And coincidentally I have speedometer acceleration videos of my stock 6.2 6 speed goin 0 to 100 mph in low 15 seconds and another vid a 2015 highcountry 6.2 with the 8 speed running 0 to 100 mph in the mid 15 second range. So maybe you were lucky to get a really fast one. Either way, very nice run.

  • 3 weeks later...
Sooperdave Enthusiast

Sooperdave

Posted
Posted

2015 Sierra 1500 cc/sb 4x4 Denali - 6.2/8 speed.

 

Very happy with this truck. It's quiet, smooth, powerful & gets amazing fuel economy!

 

It's completely stock and weighs 5700lbs. My race weight was 6000lbs. Temps today were mid-40's / 50% humidity.

 

My best pass was 13.77@99mph. Best 60 foot was 1.91.

 

Leave at 1200rpm in "4wd Auto" --- "TC" Off, then switch back to 2wd after launch.

Another one in the 70's! Nice times!!

  • 3 years later...
slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted
4 hours ago, sealandsky said:

I'm curious as to your launch technique. Di you use 4WD auto? 2WD? Traction control on or off? I've only given my new Yukon Denali one hard launch from dead stop in the 3 months I've owned it and did it in 4WD auto with traction control "off". I should have switched to 2WD after initial launch but forgot and rode it in 4WD to a 1/4 or so. With TC off I did get some wheel spin on all 4 off the line, then a solid hook.

I was launching in 4wd Auto with the Traction Control turned off. Right after the launch, I would turn it back to 2wd. I would brake torque the converter to 1200rpm.  

 

Still love the truck.  Now, it has 142,000 miles Haha. Good luck and post ur results. 

  • 1 month later...
L86 All Terrain Senior Enthusiast

L86 All Terrain

Posted
Posted
On ‎2019‎-‎04‎-‎05 at 5:26 AM, slowfive0 said:

I was launching in 4wd Auto with the Traction Control turned off. Right after the launch, I would turn it back to 2wd. I would brake torque the converter to 1200rpm.  

 

Still love the truck.  Now, it has 142,000 miles Haha. Good luck and post ur results. 

Mine will brake-boost up to 2,000 before the converter wants to pull through the brakes. No tire squeal. Maybe you can squeeze a bit more out of the 60 foot that way? Closest timer to me is 7 hour drive...

slowfive0 Enthusiast

slowfive0

Posted
  • Author
Posted

Mine went slower doing that. Seemed like 1100-1300 area was the best. My guess would be that the engine is allowed to flash and hit the converter a little harder that way vs being stalled up or loaded up near its limit.

 

 

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Deadwood
      primary drive belt tensioner

      By Deadwood · Posted

      I bought belts and pulleys for my '20 L5P at Rock Auto a couple years ago. I have used them for many years, and almost always save significant money, especially when I buy maintenance stuff ahead of time.   They carry many OEM parts, which is all I use unless an aftermarket is shown to be same/superior, or if it is an insignificant part or unavailable OEM part anywhere else. RA is usually lower priced, often by a bunch, but parts are sometimes unavailable or out of stock, and I do shop around and sometimes find better prices at other sites.   Be aware that you pay shipping, and if you buy multiple items and they are coming from different warehouses, the shipping can kill the advantage. Planning ahead is best if possible.   If you have a transmission service in the near future, check out their OEM (AC Delco ULV) fluid, usually MUCH less than anywhere else.
    • Deadwood
      10L1000 anyone with High Mileage ? I hate Damocles....

      By Deadwood · Posted

      New member here, very long time occasional guest. Saw this thread, thought it would be a good time to contribute someting. It is only my experience and not a claim that everyone will have the same.   I bought my '20 3500 L5P new and have put 99.9% (literally) of it's current ~400k miles on it myself, with over 50% of that towing loads between 4k to 15k, and to me this truck has been nothing short of amazing. For the first 235k I had zero issues, and from there until 321k I replaced a NOx sensor, two failing glow plugs, and three of the notorious injector connectors. I believe this truck is in part, a testament to good luck, but also good care and following a decent maintenance schedule (I also keep meticulous records.) As a result, it looks as good as a well cared for 70k rig, up and down, inside and out.   At some point before that 321k mile mark I began to get a little spooked about the 10L1000, especially the valve body. Word of mouth about potential issues prompted me to jump on the net to sift through all the noise and determine what all the fuss was about. I routinely take long trips, coast-to-coast and points in between, so roadside breakdowns can be '...a thousand miles from nowhere' and a bit of a challenge, and though I had no issues, my guard was up and activated.   And then I stumbled across a chance to salvage some parts off a new 2025 that had been wrecked in transport. I grabbed a few wear items (alternator, pulleys, etc.) and on a whim asked what the ten speeder would cost me. It was cheap...really cheap. I knew some changes had been made in the '24+ version 10L and were supposedly not compatible, but I called service/parts at my local Chevy dealer and asked why and they didn't know. A call to a well known aftermarket transmission outfit revealed it was very likely it would be fine, but to them not 100% sure.   Because it was cheap (really cheap) and I was spooked, I took the chance. Had it installed by a local shop and it worked like a champ, shifted just like the original. At it's first service at 37k, I had the shop put in a Next Gen valve body kit, which after some initial hiccups and rough shifts, smoothed out though with somewhat firmer shifting.   All that said, I have a very serious concern about my newer transmission as just two weeks ago it suddenly began to exhibit a strong reluctance to engage forward or reverse. It was a bit past due anyway so I took it in for service. The reason it was sticking was due to 'glitter' in the fluid clogging the filter...not good folks, often indicates a converter giving out. We ended up going ahead with the new filter and fluid, first to see if it would move and shift, and then if so buy me a little time. It did, and I've driven it over a thousand miles and it is shifting smooth, no noises or slipping. Regardless, it looks like a third gearbox is in my future so I can resume taking long trips with some confidence. In the very short term, my curiosity will have me examining the fluid to check how much glitter has reappeared.   An earlier poster had alleged, in the context of 10L100 failures, that it is another example of how we seasoned citizens somehow descend into hysteria, lose control of our senses, and react irrationally after brief encounters with the idiocy of the internet infosphere. Let me say (and I have used and abused said internet since it's infancy) there is no segment of the populace that has a corner on over-reaction to digital garbage. Just as my offering of experience in this arena is purely anecdotal and should not be considered gospel or all-encompassing, I believe it is still worthwhile information to consider, along with other relevant anecdotal experiences about things like complex transmissions, especially when balanced with other sources.   So to answer the original question, yes I got high miles out of my first 10L, trouble free for 321,000. Now I really wonder how much longer it would have went. Did I 'overreact' to the internet ghouls by replacing a 'good' one with a 'bad' one? Maybe. Who knows, the thing might have taken a puke a 100 miles later. So I'll just fix it again, then move on and start thinking about all the other stuff that will eventually wear out. It still has the original brakes (they're at ~60%), original injectors/pump, turbo, water pump, etc....pretty much original everything. Knock on wood.
    • swathdiver
      6 Speed vs 8 Speed

      By swathdiver · Posted

      At peak temperature.  They get to cool down and warm up more, especially those with the external cooler.  I have three GMT900s and one of them has over 225K on its original transmission.  Fluid gets changed about every 36K miles, all of it.     It's not the bean counters, it was the government.  They had to meet CAFE standards and other government requirements.   To get around that, we tune them and modify them to our liking.
    • GMCustomerService
      Will not stay in Reverse

      By GMCustomerService · Posted

      Our customers' safety isn't something we take lightly. To ensure you get the proper assistance for your truck's repairs, please fill out the form at https://s.chevy.com/support-request with all pertinent details including your username.
    • GMCustomerService
      2026 Z71 Forward and Rear Park Assist help

      By GMCustomerService · Posted

      We appreciate you sharing your experience with your truck. To ensure we get you the proper assistance, please fill out the form at https://s.chevy.com/support-request with all pertinent details including your username.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...