DT Dyno Estimates
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Senior User
Joined: Jun 2002
Posts: 333
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From: Carlsbad TX
DT Dyno Estimates
My computer at home is on the fritz. Could some one give me a reading on this 86 460 setup on their DT Dyno? I would appreciate it.
86 460 (30 over)
Balanced (not that there is a calculation for it)
Cam: Int/Exh is 210/218 @.050 (.487/.504) Lunati 90460LUN
headers
Stealth intake
Holley 750 (vac secondary)
Not sure of numbers on heads, but have had mild intake work and extensive exhaust work
I believe the pistons have a .180 dish (-22cc)
This will be in a Ext Cab 4x4, 4spd, for play and pulling.
If at all possible I would appreciate any HP and torque calculations, as well as compression ratio estimates. I would like to be able to hook a chain to friends and brother's non-fords and drag them through the mud!!!!
I'll take any suggestions and comments for improvement on this set-up.
Thanks in advance!!!
86 460 (30 over)
Balanced (not that there is a calculation for it)
Cam: Int/Exh is 210/218 @.050 (.487/.504) Lunati 90460LUN
headers
Stealth intake
Holley 750 (vac secondary)
Not sure of numbers on heads, but have had mild intake work and extensive exhaust work
I believe the pistons have a .180 dish (-22cc)
This will be in a Ext Cab 4x4, 4spd, for play and pulling.
If at all possible I would appreciate any HP and torque calculations, as well as compression ratio estimates. I would like to be able to hook a chain to friends and brother's non-fords and drag them through the mud!!!!
I'll take any suggestions and comments for improvement on this set-up.
Thanks in advance!!!
Elder User
Joined: Jan 2004
Posts: 648
Likes: 0
Using 9.5:1 CR I came up with the following....
HP
RPM / HP
2000 - 179
2500 - 231
3000 - 277
3500 - 325
4000 - 368
4500 - 401
5000 - 413
5500 - 404
Torque
RPM / lb-ft
2000 - 471
2500 - 486
3000 - 485
3500 - 488
4000 - 486
4500 - 468
5000 - 434
5500 - 386
Brad
HP
RPM / HP
2000 - 179
2500 - 231
3000 - 277
3500 - 325
4000 - 368
4500 - 401
5000 - 413
5500 - 404
Torque
RPM / lb-ft
2000 - 471
2500 - 486
3000 - 485
3500 - 488
4000 - 486
4500 - 468
5000 - 434
5500 - 386
Brad
Elder User
Joined: Sep 2003
Posts: 908
Likes: 4
I'm going out on a limb here, to say that you should take DT Dyno results with a grain of salt.
I tested it out (2000 version) and it says my stock '69 hi compression 429 only makes 220 HP. I know danged well this is wrong. The factory spec was 320, and even if that's inflated, it's not inflated by 100 HP.
It seems to give very little weight to engine displacement. I set up a factory 400 (the numbers on this one did come out about right) and reduced the stroke to 3.5 (351) and then 3.0 (300).
The HP and torque ratings remained about the same. They just moved to a higher power band.
There ain't no way in the world you are going to destroke a 400 to 300, and have it making the same HP and torque.
It seems useful to test out cams and other bolt ons for the COMPARATIVE differences, but I would not give a lot of creedence to the total figures.
Maybe they've improved it since the 2000 version: I don't know.
I tested it out (2000 version) and it says my stock '69 hi compression 429 only makes 220 HP. I know danged well this is wrong. The factory spec was 320, and even if that's inflated, it's not inflated by 100 HP.
It seems to give very little weight to engine displacement. I set up a factory 400 (the numbers on this one did come out about right) and reduced the stroke to 3.5 (351) and then 3.0 (300).
The HP and torque ratings remained about the same. They just moved to a higher power band.
There ain't no way in the world you are going to destroke a 400 to 300, and have it making the same HP and torque.
It seems useful to test out cams and other bolt ons for the COMPARATIVE differences, but I would not give a lot of creedence to the total figures.
Maybe they've improved it since the 2000 version: I don't know.
Elder User
Joined: Jan 2004
Posts: 648
Likes: 0
The DD numbers are accurate ONLY if the rest of the information is accurate. Especially critical are the head settings, cam numbers, and exhaust options. With the large number of variables, it's very easy to miss something.
I did a sim run not long ago using the info from Jon Kaase's 780 hp test mule (his Cobra Jet head redesign on his website). The DD run cam up only 1 HP off the numbers Jon has posted on his website.
I ran a quick sim using the built-in options that are closest to the pre-71 spec T-Bird 429. I came up with 309 HP @ 4500 RPM and 451 lb-ft torque @ 3000 RPM. I could finesse it a little given some time and research (especially on cam specs), but this is close enough to illustrate that DD really is a pretty good program for estimating power outpu.
Brad
I did a sim run not long ago using the info from Jon Kaase's 780 hp test mule (his Cobra Jet head redesign on his website). The DD run cam up only 1 HP off the numbers Jon has posted on his website.
I ran a quick sim using the built-in options that are closest to the pre-71 spec T-Bird 429. I came up with 309 HP @ 4500 RPM and 451 lb-ft torque @ 3000 RPM. I could finesse it a little given some time and research (especially on cam specs), but this is close enough to illustrate that DD really is a pretty good program for estimating power outpu.
Brad
