New Personal Best - 2015 Sierra 6.2
Nov 16, 2015 | 09:42 PM
#12
TECH Addict
Joined: Nov 2015
Posts: 2,100
Likes: 558
From: Coastal NC
That should be right at 365rwhp so I dont see why its not believable? C&D say they got it to turn a 14.1 @99 mph. So he got a better 60' I'd bet the C&D driver didnt leave as hard and they typically test loaded models so it might have been heavier or it could have been at higher elevation...
Nov 18, 2015 | 01:59 PM
#14
Staging Lane
Joined: Sep 2014
Posts: 64
Likes: 0
Well 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.
Nov 18, 2015 | 09:17 PM
#15
Thread Starter
TECH Apprentice
Joined: Jul 2005
Posts: 375
Likes: 0
From: Utica, MI
Damn, didn't even know I had replies (stupid system didn't notify me til now).
To all the guys giving props---thanks, I appreciate it
It might actually be better for the t-case leaving in 4x4 high since in 4x4 auto, the internal clutch is obviously having to ramp up as it gets some spin from the rear tires. I'll have to test that next time. The truck is indeed going back to 2wd. I know the older models didn't but these do. Two things happen when you switch back to 2wd. One the t-case disengages. Two, a coupler in the front differential disengages the passenger side axle. I can't say for sure that both of those things are happening, but I know it's not engaged in 4x4 as I'm making my pass. It is possible that the t-case is staying engaged until I let off the throttle but if it is it isn't applying power to the front axle (as the axle would be disengaged). Not sure, could be the opposite too (t-case disengages/axle doesn't). Looking forward to someone testing this further.
Stock as it gets. Hell, I haven't even changed the air cleaner (42,000 miles). I took it out after making a bunch of passes and it had quite a bit of dirt in it lol! Plus, I weigh 300lbs.
No videos. To be diplomatic, I would also point out that I ran 14.06 at 96.X in mid 60 degree temps. Obviously, that time would slow as the temperature/humidity increases too...
Here are a couple of links you guys might find interesting:
https://www.performancetrucks.net/fo...-539848/page2/
New Personal Best - 2015 Sierra 6.2 - Racing, Strip, & Track - GM-Trucks.com
I've brake torqued mine and it spins the tires around 2500 iirc. I haven't tried leaving that high. My experience (in general) has found that usually, loading the vehicle a little and then allowing the converter to flash to its stall speed seems to work the best. Kind of a sling shot effect if you will. Definitely, something worth exploring though. Quite possibly another rpm may work a tad better. I was just looking to see what the truck runs in general.
What was the temperatures when you ran the 14.7? Elevation? Humidity? Weather conditions in general (was the air good)? 60 foot time? How were you launching it? Floor mat under the pedal? Just j/k lol
I found the times to vary a little bit more then I thought they should. If you read my link (posted above), I found somethings odd. For example, cooling down for 2.5 hours and not besting my fastest time of the day, but then hot lapping it and then running my best et/mph of the day. Weird. Not sure if it's the IAT tables pulling too much timing at other temps then fully warmed up or what. I'm sure others on here will test and find those nuances and limits.
I think your truck was one of the first to get a s/c and then headers???? If it's that one I've been following your threads. I didn't want to say anything that wasn't positive, but I thought it should have run a lot faster, but attributed it to very conservative tuning....
On the older trucks, there are a million radix blower combos out there and most seem to run 13's and some 12's. I would have never guessed in a million years that they could go much faster then that. Krambo had been 11.7x with his and he helped me get mine down to 12.20 at 110. Combo was very basic and mild. Sold it with 200,000 miles---it was an awesome truck. I bet yours has a ton more potential in it---can't wait to see you get it figured out.
To all the guys giving props---thanks, I appreciate it
It might actually be better for the t-case leaving in 4x4 high since in 4x4 auto, the internal clutch is obviously having to ramp up as it gets some spin from the rear tires. I'll have to test that next time. The truck is indeed going back to 2wd. I know the older models didn't but these do. Two things happen when you switch back to 2wd. One the t-case disengages. Two, a coupler in the front differential disengages the passenger side axle. I can't say for sure that both of those things are happening, but I know it's not engaged in 4x4 as I'm making my pass. It is possible that the t-case is staying engaged until I let off the throttle but if it is it isn't applying power to the front axle (as the axle would be disengaged). Not sure, could be the opposite too (t-case disengages/axle doesn't). Looking forward to someone testing this further.
Stock as it gets. Hell, I haven't even changed the air cleaner (42,000 miles). I took it out after making a bunch of passes and it had quite a bit of dirt in it lol! Plus, I weigh 300lbs.
No videos. To be diplomatic, I would also point out that I ran 14.06 at 96.X in mid 60 degree temps. Obviously, that time would slow as the temperature/humidity increases too...
Here are a couple of links you guys might find interesting:
https://www.performancetrucks.net/fo...-539848/page2/
New Personal Best - 2015 Sierra 6.2 - Racing, Strip, & Track - GM-Trucks.com
I've brake torqued mine and it spins the tires around 2500 iirc. I haven't tried leaving that high. My experience (in general) has found that usually, loading the vehicle a little and then allowing the converter to flash to its stall speed seems to work the best. Kind of a sling shot effect if you will. Definitely, something worth exploring though. Quite possibly another rpm may work a tad better. I was just looking to see what the truck runs in general.
What was the temperatures when you ran the 14.7? Elevation? Humidity? Weather conditions in general (was the air good)? 60 foot time? How were you launching it? Floor mat under the pedal? Just j/k lol
I found the times to vary a little bit more then I thought they should. If you read my link (posted above), I found somethings odd. For example, cooling down for 2.5 hours and not besting my fastest time of the day, but then hot lapping it and then running my best et/mph of the day. Weird. Not sure if it's the IAT tables pulling too much timing at other temps then fully warmed up or what. I'm sure others on here will test and find those nuances and limits.
I think your truck was one of the first to get a s/c and then headers???? If it's that one I've been following your threads. I didn't want to say anything that wasn't positive, but I thought it should have run a lot faster, but attributed it to very conservative tuning....
On the older trucks, there are a million radix blower combos out there and most seem to run 13's and some 12's. I would have never guessed in a million years that they could go much faster then that. Krambo had been 11.7x with his and he helped me get mine down to 12.20 at 110. Combo was very basic and mild. Sold it with 200,000 miles---it was an awesome truck. I bet yours has a ton more potential in it---can't wait to see you get it figured out.
Well 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.
Nov 18, 2015 | 10:02 PM
#16
TECH Junkie
Joined: Jan 2007
Posts: 3,309
Likes: 265
From: Arlington, TX
I could see that with the excellent 60' 6.2 and 8 speed. My 6 speed hit 1.99 the only time I took it out and its not geared nearly as good. Also the trap in the 1/8 at 78+. I was 75 with a 5.3 so I think your truck is awesome and more power to ya!!! Choda my '07 definitely would switch out of 4wd under WOT. It would blow the tires off if I did it too early on a pass but I always did it manually so as not to shock the autotrac too much 
Nov 19, 2015 | 06:34 AM
#17
Staging Lane
Joined: Sep 2014
Posts: 64
Likes: 0
Damn, didn't even know I had replies (stupid system didn't notify me til now).
To all the guys giving props---thanks, I appreciate it
It might actually be better for the t-case leaving in 4x4 high since in 4x4 auto, the internal clutch is obviously having to ramp up as it gets some spin from the rear tires. I'll have to test that next time. The truck is indeed going back to 2wd. I know the older models didn't but these do. Two things happen when you switch back to 2wd. One the t-case disengages. Two, a coupler in the front differential disengages the passenger side axle. I can't say for sure that both of those things are happening, but I know it's not engaged in 4x4 as I'm making my pass. It is possible that the t-case is staying engaged until I let off the throttle but if it is it isn't applying power to the front axle (as the axle would be disengaged). Not sure, could be the opposite too (t-case disengages/axle doesn't). Looking forward to someone testing this further.
Stock as it gets. Hell, I haven't even changed the air cleaner (42,000 miles). I took it out after making a bunch of passes and it had quite a bit of dirt in it lol! Plus, I weigh 300lbs.
No videos. To be diplomatic, I would also point out that I ran 14.06 at 96.X in mid 60 degree temps. Obviously, that time would slow as the temperature/humidity increases too...
Here are a couple of links you guys might find interesting:
https://www.performancetrucks.net/fo...-539848/page2/
New Personal Best - 2015 Sierra 6.2 - Racing, Strip, & Track - GM-Trucks.com
I've brake torqued mine and it spins the tires around 2500 iirc. I haven't tried leaving that high. My experience (in general) has found that usually, loading the vehicle a little and then allowing the converter to flash to its stall speed seems to work the best. Kind of a sling shot effect if you will. Definitely, something worth exploring though. Quite possibly another rpm may work a tad better. I was just looking to see what the truck runs in general.
What was the temperatures when you ran the 14.7? Elevation? Humidity? Weather conditions in general (was the air good)? 60 foot time? How were you launching it? Floor mat under the pedal? Just j/k lol
I found the times to vary a little bit more then I thought they should. If you read my link (posted above), I found somethings odd. For example, cooling down for 2.5 hours and not besting my fastest time of the day, but then hot lapping it and then running my best et/mph of the day. Weird. Not sure if it's the IAT tables pulling too much timing at other temps then fully warmed up or what. I'm sure others on here will test and find those nuances and limits.
I think your truck was one of the first to get a s/c and then headers???? If it's that one I've been following your threads. I didn't want to say anything that wasn't positive, but I thought it should have run a lot faster, but attributed it to very conservative tuning....
On the older trucks, there are a million radix blower combos out there and most seem to run 13's and some 12's. I would have never guessed in a million years that they could go much faster then that. Krambo had been 11.7x with his and he helped me get mine down to 12.20 at 110. Combo was very basic and mild. Sold it with 200,000 miles---it was an awesome truck. I bet yours has a ton more potential in it---can't wait to see you get it figured out.
To all the guys giving props---thanks, I appreciate it
It might actually be better for the t-case leaving in 4x4 high since in 4x4 auto, the internal clutch is obviously having to ramp up as it gets some spin from the rear tires. I'll have to test that next time. The truck is indeed going back to 2wd. I know the older models didn't but these do. Two things happen when you switch back to 2wd. One the t-case disengages. Two, a coupler in the front differential disengages the passenger side axle. I can't say for sure that both of those things are happening, but I know it's not engaged in 4x4 as I'm making my pass. It is possible that the t-case is staying engaged until I let off the throttle but if it is it isn't applying power to the front axle (as the axle would be disengaged). Not sure, could be the opposite too (t-case disengages/axle doesn't). Looking forward to someone testing this further.
Stock as it gets. Hell, I haven't even changed the air cleaner (42,000 miles). I took it out after making a bunch of passes and it had quite a bit of dirt in it lol! Plus, I weigh 300lbs.
No videos. To be diplomatic, I would also point out that I ran 14.06 at 96.X in mid 60 degree temps. Obviously, that time would slow as the temperature/humidity increases too...
Here are a couple of links you guys might find interesting:
https://www.performancetrucks.net/fo...-539848/page2/
New Personal Best - 2015 Sierra 6.2 - Racing, Strip, & Track - GM-Trucks.com
I've brake torqued mine and it spins the tires around 2500 iirc. I haven't tried leaving that high. My experience (in general) has found that usually, loading the vehicle a little and then allowing the converter to flash to its stall speed seems to work the best. Kind of a sling shot effect if you will. Definitely, something worth exploring though. Quite possibly another rpm may work a tad better. I was just looking to see what the truck runs in general.
What was the temperatures when you ran the 14.7? Elevation? Humidity? Weather conditions in general (was the air good)? 60 foot time? How were you launching it? Floor mat under the pedal? Just j/k lol
I found the times to vary a little bit more then I thought they should. If you read my link (posted above), I found somethings odd. For example, cooling down for 2.5 hours and not besting my fastest time of the day, but then hot lapping it and then running my best et/mph of the day. Weird. Not sure if it's the IAT tables pulling too much timing at other temps then fully warmed up or what. I'm sure others on here will test and find those nuances and limits.
I think your truck was one of the first to get a s/c and then headers???? If it's that one I've been following your threads. I didn't want to say anything that wasn't positive, but I thought it should have run a lot faster, but attributed it to very conservative tuning....
On the older trucks, there are a million radix blower combos out there and most seem to run 13's and some 12's. I would have never guessed in a million years that they could go much faster then that. Krambo had been 11.7x with his and he helped me get mine down to 12.20 at 110. Combo was very basic and mild. Sold it with 200,000 miles---it was an awesome truck. I bet yours has a ton more potential in it---can't wait to see you get it figured out.
Yes it was my truck that was one of the first to get a SC AND HEADERS. As for the times at the track, I too thought it would be a bit quicker and I also thought that there would be a bit more rwhp. The tune is somewhat conservative and I'm ok with that. I would like to step it up a bit with a cam and maybe some head work and that should net MAYBE another 75 to 100 rwhp( not sure though). My only concern that there is a truck built by Livernois that pushes 640 rwhp which about 190 rwhp more than my truck and it only got 12.54 @ 110 mph at the track. There is also another truck in my area that has some work and a 100 shot of nitrous and pushes 560 rwhp and it ran 12.5 also. Seems like the numbers are all over the map. Any thoughts?
Nov 19, 2015 | 08:52 AM
#18
He's turning a better time than me with an RCSB headers, E85 & tune, Caltracs, DRs & Viking DA shocks. I managed 1.90 60' and a PB of 13.9.
Oh and 4875lbs race weight.
Oh and 4875lbs race weight.
Last edited by bigsapper; Nov 19, 2015 at 12:37 PM.
Nov 19, 2015 | 12:29 PM
#19
Thread Starter
TECH Apprentice
Joined: Jul 2005
Posts: 375
Likes: 0
From: Utica, MI
I would say the tune is a lot of your issue. How much boost are you getting? When I first got my SS, it ran 13.60 hot lapping it. Let it cool down for 3 hours and it ran 13.1 lol! That was with the magnacharger (M112), Volant CAI, shorty headers, stock mid pipe with cats, Corsa Sport exhaust, 6 cylinder TB stall converter & 2.8 pulley. Added a 2600 Circle D triple disc converter, long tubes with 3" dual exhaust and more tuning. Went a best of 12.20 @ 110. I think my biggest bang for my buck was the tuning though. It was ultra conservative and I don't blame any big company one little bit for being conservative. They are damned if they do and damned if they don't. I'd rather have the problem of the truck doesn't run as good as company B than have it blow up lol!
I can also tell you that the temperature and air has a huge impact on your trucks performance! Especially, blown combos like yours. Get that out right now in some 30-40^ air and let it eat! Should pick up quite nicely. I would also, get with a good tuner who can spend some one on one time with it to push the limits without being dangerous. i.e. I picked up almost 2 tenths on my truck by just adding 2 degrees of timing down low in the timing map where my converter was flashing to. It was in the mid to high 1.7 range before that change. It was cut low low 1.7's after that. Even had a few 1.6x passes.
Spend time tweaking what you have and it will respond. I wouldn't change the cam or heads at this point. My SS race weight was 5520. This truck 6000 for reference.
I can also tell you that the temperature and air has a huge impact on your trucks performance! Especially, blown combos like yours. Get that out right now in some 30-40^ air and let it eat! Should pick up quite nicely. I would also, get with a good tuner who can spend some one on one time with it to push the limits without being dangerous. i.e. I picked up almost 2 tenths on my truck by just adding 2 degrees of timing down low in the timing map where my converter was flashing to. It was in the mid to high 1.7 range before that change. It was cut low low 1.7's after that. Even had a few 1.6x passes.
Spend time tweaking what you have and it will respond. I wouldn't change the cam or heads at this point. My SS race weight was 5520. This truck 6000 for reference.
Yes it was my truck that was one of the first to get a SC AND HEADERS. As for the times at the track, I too thought it would be a bit quicker and I also thought that there would be a bit more rwhp. The tune is somewhat conservative and I'm ok with that. I would like to step it up a bit with a cam and maybe some head work and that should net MAYBE another 75 to 100 rwhp( not sure though). My only concern that there is a truck built by Livernois that pushes 640 rwhp which about 190 rwhp more than my truck and it only got 12.54 @ 110 mph at the track. There is also another truck in my area that has some work and a 100 shot of nitrous and pushes 560 rwhp and it ran 12.5 also. Seems like the numbers are all over the map. Any thoughts?
