14.73@95 mph CCSB LTZ on 20's w/5.3

SILVER SLED · March 18, 2015

Don't hate but this was with using a dashhawk. I used it a couple times on my old TBSS and it was pretty accurate within a tenth. I am going to the track this spring to get some actual times. I launched in 4wd then quickly switched to 2wd with no slippage, and usually with no slippage the dashhawk is more accurate. I have a std diablo 91 octane canned tune and an MIT intake tube. I will have Lew tune it someday, but I just wanted an idea for now. Either way, after running a couple 14.7's launching at 1500 rpm I can safely say it's a 14 sec truck. Maybe with Lews tune and some more tricks it will be a low 14 sec truck. The bad thing is that if this gets too close to 13's I may end up spending money.

14'SilveradoLT · March 18, 2015

I would like to see what the custom tune gains...not bad for a canned tune though. I miss the turbos from the ecoboost....I do NOT miss the problems that Ford fails to adequately fix on the motor.

I was pulling 13.3s in a 2013 F-150 SuperCrew 4x4 with custom tune, intake, exhaust. Insanely easy to get into the low 13's. I think they might have broke into 12s here recently on 2wd extended cab truck.

The 5.3L's tq band in that midrange is superb IMHO, add some polished timing/fuel into the upper range and the 5.3L should dip a little lower.

thetruck454 · March 18, 2015

That's moving for a 5.3

KARNUT · March 18, 2015

I don't doubt it, everything I own is high performance with my 14 GMC being the slowest. That being said on E85 with a tune and 342s 14 sec. range in the 1/4 mile wouldn't surprise me.

SILVER SLED · March 18, 2015

I'm sure the dashhawk is a little optamistic. But my mindset getting into this and out of a 13.08 "intake and tune only" Trailblazer SS is that this truck will be a pig, but a very nice on. After driving it a while, it just didn't seem that god awful slow. So I dug up my dashhawk and gave it a wirl. When I go to the track, I will prob take off the spare, tailgate, and the milk crate full of "stuff" in the bed. This truck does have 3.42's. I launched at 1500 rpm, because at that point, things seemed a bit stressed, and didn't want to push it higher. I couild only imagine this thing with a Circle-D stock size 3200 stall converter, maybe an underdrive pulley.... But that's not what I got this truck for... is what I keep telling myself. lol

darkfox1 · March 18, 2015

you switched from 4 to 2 while deep in the throttle and it didn't explode?

Good to know. I'm terrified of breaking my encoder motor.

That's good for these trucks! I'd say you HAVE to have 4wd or at least a limited slip rear. I can't hardly touch the gas in my truck without lighting up the tires.

I have 3.07s. I dont have any numbers but I'm sure I'm a GOOD bit slower than that.

I'm really anxious to see what these genV motors can do though. I checked texas speed the other day and see they still don't have any cams for our motors. I'm curious to know what a cammed 5.3 can do to the wheels. (something low/midlevel.)

I'm not really into trying to make my truck "fast" but, ya know keeping up with traffic would be nice. It kinda lags behind now. I chock it up to the cost of being in a 7000 pound 4 door 4wd truck.

Jon A · March 18, 2015

I couild only imagine this thing with a Circle-D stock size 3200 stall converter, maybe an underdrive pulley.... But that's not what I got this truck for... is what I keep telling myself. lol

All you need is a good tune to launch at 2500 or so RPM. Should help the 60' a lot.

SILVER SLED · March 19, 2015

All you need is a good tune to launch at 2500 or so RPM. Should help the 60' a lot.

Agreed. I didn't know one could change the converter stall that much through tuning.

vettelovralexand · March 19, 2015

If the 6l80 is like mine, it'll take more power than the brakes can hold to increase the stall to 2500 or more.

SILVER SLED · March 19, 2015

If the 6l80 is like mine, it'll take more power than the brakes can hold to increase the stall to 2500 or more.

It must be, because at 1500 things are feeling and sounding quite stressed.

Sooperdave · March 19, 2015

Good to know the DashHawk actually works. I plugged mine in once and it seemed to be freaking out so I just unplugged it and put it away. I'll try it again!

Jon A · March 19, 2015

If the 6l80 is like mine, it'll take more power than the brakes can hold to increase the stall to 2500 or more.

Keep in mind, in 4WD your front brakes help hold the power and they're a lot more powerful than the rear brakes. I may have spoken too soon on the 2500 RPM though since we're talking about 5.3's--mine will do 2600 but it's a 6.2, I don't know exactly what a 5.3 will do. A heck of a lot better than 1500 though!

It must be, because at 1500 things are feeling and sounding quite stressed.

It sounds stressed because torque management is strangling the engine to effectively put a rev limit at 1500. The 1500 limit is programmed right in. Things sound fine when the engine isn't being choked.

SILVER SLED · March 19, 2015

I have to mash the brake pedal hard to hold it at 1500, and the brakes still gave a bit. And I heard a clunk or two (other than the sound of the brakes giving a bit). I did get the rpms over 1500, but was just a little to harsh for me to bear. When I go to the track though, I will give it hell and see what happens.

vettelovralexand · March 19, 2015

Mine will push straight through in 4wd. Ive got video to prove it and it still was only at barely over 2k rpm. Granted i dont have factory disk rear brakes.

TJay74 · March 19, 2015

You cant change the stall in these trucks or the 6L80E via tuning, stall is a mechanical feature of the converter. There are some torque management abuse controls you could modify with a custom tune or if you have EFI Live or HP Tuners.

I personally would not change from 4wd to 2wd under a hard launch, as said the encoder motor is not designed to be under that kind of load while changing the transfer case. It can handle normal driving and changes.