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Long Live The King
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106,082 Posts
Discussion Starter #1
I finally got around to pulling out the dyno sheet's from 2007 to compare un-corrected numbers:

2007 DTS dyno : uncorrected

Baro Pressure: 29.2
Humidity: 41%
Air temp: 84*

6,000 706 lbs ft, 804 hp

6,200 699 lbs ft, 825 hp

7,000 643 lbs ft, 857 hp ( corrected 935 )
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2011 Super Flow 902 dyno: uncorrected


Baro Pressure: 29.02
Humidity: 45%
Air Temp: 91*
Density Alt: 3,400

un-corrected:

6,000 691 lbs ft, 790 hp

6,200 691 lbs ft, 816 hp

7,000 632 lbs ft , 845 hp ( corrected 944)

=======================

Raw data power numbers are with-in 1.1% at 6,200 and 1.5% at 7,000.


G
 

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Just pulled one of my sheets from Precision Automotive's inertia dyno.

Temp: 74*
Baro: 30.24
Humidity: 33.0

Observed...

6100 651tq (peak tq)......757hp

7400 621tq (target converter flash)......874hp

8300 560tq.......886hp (peak hp)

Corrected...

6100 657tq.......764hp

7400 626tq.......882hp

8300 565tq.......894hp

417ci nitrous build with an old W8 Craftsman truck head, 420 intake and 110 SV-1.
 

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Highly funded facilities with multiple dyno cells under one roof have some (usually slight) variability from room to room so I wouldn't expect "tight" correlation between different dyno equipment under different roofs.

The results you got look very good (correlation), assuming the engine has absolutely not changed over 4 years.
 

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Long Live The King
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106,082 Posts
Discussion Starter #4 (Edited)
The results you got look very good (correlation), assuming the engine has absolutely not changed over 4 years.
Engine went through a top to bottom rebuild...but same cam at the same setting, same heads. 1 point bump in compression ( went to 13:1 from 12.2:1) new pistons with a few new tricks and new ring pack...etc etc. ( see last post in the engine build show and tell sticky at the top of the page)

All else being equal I'm thinking the 2011 numbers are conservative ( I'm glad ) means the engine will do as expected or better once it gets on the water.

Maybe it will make some more power once I lossen it up after some nitrous passes ......... :smt103 lol ;)

G
 

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I helped a fella dyno a pump gas 496 on our local SF902. It was 1st dyno'd on the builders SF901 in Colorado. DA during dyno sessions was approximately 8500ft(CO) vs 1500ft(local). The difference in corrected hp & tq between the 2 dyno's was less than 1%. I was impressed with the correction factor's being able to work that well over such a broad range of conditions.
 
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