someone with desktop dyno help please
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Freshman User
Joined: Feb 2004
Posts: 36
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someone with desktop dyno help please
can someone give me aprox. HP & torque for this build. thanks in advance for any help. 460 bored .30 d3 heads ported on exaust side to remove bump, 9.5 comp. flat tops, comp cams 4x4 ext. cam with 218/226 dur.@ .50 and 515/524 lift, stealth intake (non CJ) and 770 truck avenger. Thanks for any aprox. numbers .
Elder User
Joined: Jan 2004
Posts: 648
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With the Comp Cams Xtreme 4x4 unit you spec'd
Torque
rpm / lb-ft
2000 / 257
2500 / 300
3000 / 312
3500 / 341
4000 / 369
4500 / 385
5000 / 379
5500 / 351
Horsepower
rpm / HP
2000 / 98
2500 / 143
3000 / 178
3500 / 227
4000 / 281
4500 / 330
5000 / 361
5500 / 367
Honestly I'm a little dissapointed in the numbers this cam is making. I reran the sim with a Lunati Avenger (p/n 90460LUN) and the numbers jumped considerably.
Torque
rpm / lb-ft
2000 / 471
2500 / 486
3000 / 486
3500 / 489
4000 / 484
4500 / 469
5000 / 435
5500 / 387
Horsepower
rpm / HP
2000 / 179
2500 / 231
3000 / 278
3500 / 326
4000 / 369
4500 / 402
5000 / 414
5500 / 406
Even though you didn't say so, I presumed you were using headers in your build. Both sims were run using the small-tube header profile.
Brad
Torque
rpm / lb-ft
2000 / 257
2500 / 300
3000 / 312
3500 / 341
4000 / 369
4500 / 385
5000 / 379
5500 / 351
Horsepower
rpm / HP
2000 / 98
2500 / 143
3000 / 178
3500 / 227
4000 / 281
4500 / 330
5000 / 361
5500 / 367
Honestly I'm a little dissapointed in the numbers this cam is making. I reran the sim with a Lunati Avenger (p/n 90460LUN) and the numbers jumped considerably.
Torque
rpm / lb-ft
2000 / 471
2500 / 486
3000 / 486
3500 / 489
4000 / 484
4500 / 469
5000 / 435
5500 / 387
Horsepower
rpm / HP
2000 / 179
2500 / 231
3000 / 278
3500 / 326
4000 / 369
4500 / 402
5000 / 414
5500 / 406
Even though you didn't say so, I presumed you were using headers in your build. Both sims were run using the small-tube header profile.
Brad
Elder User
Joined: Jan 2004
Posts: 648
Likes: 0
The numbers are actually pretty good for a relatively stock low-rpm specific build. You're within a hair's breadth of 500 lb-ft torque, and that's at a leisurely 3500 rpm! If you didn't mind the torque curve peaking at a slightly higher RPM - maybe 4000 or so - you could easily surpass the 500 lb-ft barrier, but you would begin to lose some of that all-important low-rpm tractability.
About the only thing I could suggest would be to spend a couple of bucks on a good port-matching job. Also, stick with small-tube primaries on your headers to maximize cylinder scavenging for better low-rpm response.
Don't get discouraged. Everyone always dreams big HP numbers that often don't pan out. We've all been there. Be satisfied knowing everyone else is in the same boat with you!
Brad
About the only thing I could suggest would be to spend a couple of bucks on a good port-matching job. Also, stick with small-tube primaries on your headers to maximize cylinder scavenging for better low-rpm response.
Don't get discouraged. Everyone always dreams big HP numbers that often don't pan out. We've all been there. Be satisfied knowing everyone else is in the same boat with you!
Brad
Thread Starter
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Freshman User
Joined: Feb 2004
Posts: 36
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thanks again Brad i was a little dissapointed with the comp cam #'s but over all i think it will work well for my truck. I have a 79 F-150 swb with C6 lockers in front and rear 38's and 456 gears. thanks again for the #'s i have seen alot of good info on this forum. matt
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