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PocketDyno results - 2004 Silverado 4x4 Z71

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joutlaw

joutlaw

Golden Member
I have the PocketDyno app on my iPhone and gave it a whirl last night

2004 Regular Cab Short Bed Silverado 4x4 Z71
5.3L
Magnaflow Catback
K&N drop in
Blackbear datalogged tune
3.73s with G80 locking differential

My run didn't have tow-haul enabled which removes 100% torque management from the transmission tuning. No tire spin and without brake torque'ing

Max Accel 0.56 g's
Max Dist 1320.06 ft
Max Velocity 97.19
Max Power 270 whp

R/T 0.81 secs
60' 2.44 secs
330' 6.55 secs
1/8 9.86s @ 76.64 mph
1000' 12.65 secs
1/4 14.97s @ 97.18 mph

0-10 .55 secs
0-20 1.55 secs
0-30 2.70 secs
0-40 3.87 secs
0-50 5.08 secs
0-60 6.69 secs
0-70 8.56 secs
0-80 10.55 secs
0-90 12.75 secs

I think if I had tow haul mode on it would have made the 1/2 shift at around 50 mph faster. The truck runs pretty strong. I have a ranch hand rear bumper which I think is helping keep some weight on the rear.

I went off-roading these weekend with quite a bit of mud caked on. I imagine if I washed it I might have picked up a little too. I'm still happy with the results for such a heavy truck.
 
Its probably about as accurate as a g-tech.

Supposedly, very good for repeatability and relative comparisons (after adding mods, etc.) but bad for absolute numbers.
 
The truck is much quicker than stock. Torque management really holds these motors back. I got 80% removed in the engine and transmission tuning. 100% removed in the transmission tuning with tow-haul enabled. It's hard to describe what torque management does, but it basically pulls timing at WOT and in-between gear changes to help save the driveline. Most modern vehicles have similar tuning.

I forgot to mention that I do have a Corvette Servo in the transmission. I also run a 265/75/R16 tire which is close 31" I believe.

I believe my rear bumber really helps to keep the truck from spinning. Here is a pic that I had on my phone. Not the greatest but you get the idea.

photoged.jpg
 
The times are difficult to believe, though. You are in 6L SS territory according to those numbers.
 
2007 regular Silverado 4X4 numbers:

ENGINE TYPE: pushrod 16-valve V-8, iron block and aluminum heads, port fuel injection
Displacement: 364 cu in, 5967cc
Power (SAE net): 367 bhp @ 5500 rpm
Torque (SAE net): 375 lb-ft @ 4300 rpm

TRANSMISSION: 4-speed automatic

DIMENSIONS:
Wheelbase: 143.5 in Length: 230.2 in Width: 80.0 in Height: 73.7 in
Curb weight: 5600 lb

C/D TEST RESULTS:
Zero to 60 mph: 7.5 sec
Zero to 90 mph: 16.4 sec
Street start, 5-60 mph: 7.7 sec
Standing ¼-mile: 15.8 sec @ 89 mph
 
LTC8K6 said:
2007 regular Silverado 4X4 numbers:

ENGINE TYPE: pushrod 16-valve V-8, iron block and aluminum heads, port fuel injection
Displacement: 364 cu in, 5967cc
Power (SAE net): 367 bhp @ 5500 rpm
Torque (SAE net): 375 lb-ft @ 4300 rpm

TRANSMISSION: 4-speed automatic

DIMENSIONS:
Wheelbase: 143.5 in Length: 230.2 in Width: 80.0 in Height: 73.7 in
Curb weight: 5600 lb

C/D TEST RESULTS:
Zero to 60 mph: 7.5 sec
Zero to 90 mph: 16.4 sec
Street start, 5-60 mph: 7.7 sec
Standing ¼-mile: 15.8 sec @ 89 mph
Click to expand...

Difference being is my truck doesn't way 5600lbs. It's a regular cab short bed with a 119" wheelbase and only 203.2" long. It weighs only 4439lbs without including me, heavy duty bumper, toolbox, or all the caked on mud.

http://www.4x4review.com/Reviews/VehicleReviews/04ChevySilverado1500review/tabid/147/Default.aspx

If the SS was 1000lbs lighter I imagine it would be a good bit faster.
 
The SS was 5240 pounds. Both trucks have more horses and torque.

Why trust the app anyway? Get some real numbers.
 
LTC8K6 said:
The SS was 5240 pounds. Both trucks have more horses and torque.

Why trust the app anyway? Get some real numbers.
Click to expand...

I don't trust the whp number... to many variables. I do believe the 0-60 and 1/4 mile numbers are fairly accurate.
 
Heh, yeah, I have the DynoStorm version on my Storm 2 and while these apps are fun, I don't hold a great deal of stock in them. It seemed to think my 343hp M3 had 352hp on one run. They are affected by tilt angle of the device, so making sure it's solid and flat is essential to get 'best guess' numbers.
 
jlee said:
That seems pretty quick...I wonder how accurate it is.
Click to expand...

Its pretty accurate. Though 60 foot is usually a bit more then what it lists( I did 2.48 it listed 2.2). I ran the 1/8 in 9.39 it said I did it in 9.2 , it reads a bit low on the 1/4 mile time as well but its pretty close.
 
Last edited:
DivideBYZero said:
Heh, yeah, I have the DynoStorm version on my Storm 2 and while these apps are fun, I don't hold a great deal of stock in them. It seemed to think my 343hp M3 had 352hp on one run. They are affected by tilt angle of the device, so making sure it's solid and flat is essential to get 'best guess' numbers.
Click to expand...

Yes, but if you imputed the incorrect weight of your car then it will give you a different number, I got 275 at the crank and thats almost spot on for my car which is rated at 280.
 
thescreensavers said:
Yes, but if you imputed the incorrect weight of your car then it will give you a different number, I got 275 at the crank and thats almost spot on for my car which is rated at 280.
Click to expand...

It has the correct weight. I'm just lucky and have CSL level output from a regular non-CSL S54. 😉
 
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