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Old 02-12-2016, 02:00 AM   #1
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Horsepower guesses?

So im waiting for a local shop to have its annual dyno day to actually test, but I have a 79 with a TH350 and 2.41 gears in the diff that will go zero to 60 in ~6.4 seconds. It hits 60 in first gear in the 5000 rpm range because of its high rear gears, but anyone have any guesses on the horsepower my engine makes? Its got a cam and high compression heads is all I know, bought it from a guy who bought it from anither guy who kept no record of the actual build.


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Old 02-12-2016, 02:26 AM   #2
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275 hp. To the wheels. Just a guess.
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Old 02-12-2016, 07:07 AM   #3
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Im gonna guess 255hp at the wheels.

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Old 02-12-2016, 09:51 PM   #4
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245~250 to the wheels.


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Old 02-13-2016, 03:39 AM   #5
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Old 02-14-2016, 09:56 AM   #6
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Even with those 2.41 gears? Ive heard the stock z28s from those years would run 7-8s 0-60 with 3.73 gears, so would the gears cause power loss and I'm making more at the crank? Cuz I can beat a pontiac g6 with a 3.9 L producing 240 horsepower with 3.55 gears in the diff. So assuming im losing a lot of power in gears in the rear, how much less horsepower am I losing vs having 3.73s or 4.11s? And any guesses on how much faster the 0-60 would be assuming i could get traction?


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Old 02-14-2016, 10:43 AM   #7
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How did you time that you go 0-60 in 6.4 seconds?

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98 z28 artic white. ls1, auto, free mods, slp lid, ¡egr, ¡air, ls6 intake manifold, walbro 255lph fuel pump, ceramic coated pacesetter longtube headers, pacesetter ory, magnaflow catback, 4.10:1 gears. 9.03 1/8th mile with factory 2.73s and 30psi fuel pressure.

02 firebird sunset orange metallic. v6, auto, slp lid, zzp tubing, port matched upper and lower intake manifolds.


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Old 02-14-2016, 11:16 AM   #8
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Horsepower guesses?

1979 z28 factory specs:

350ci v8
170hp @ 4000rpm
265 tq @ 2400rpm

Gears: 3.42

Tested:
0-60 9.4 sec
1/4: 17.2

Curb Weight: 3,582 lbs

There was also a 175hp/270tq version. Which would make for "slightly" better performance.

Keep in mind, 73-92 model years was "THE" worst years for vehicle performance.
With the exception of the same year Camaro IROC/z28 and Pontiac Trans Am. (86-92?) these weren't too bad for their era.

http://www.automobile-catalog.com/auta_details1.php


2007 Pontiac g6 Sedan:

3.9l
6 speed manual
240hp @ 6000rpm
240tq @ 2800rpm

Tested:
0-60: 6.2 sec
1/4: 14.9

Curb Weight: 3,569

http://m.caranddriver.com/features/t...6-gt-39-page-2


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Old 02-14-2016, 04:31 PM   #9
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Lol a stopwatch and watching the speedo. Probably not real precise.


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Old 02-14-2016, 05:17 PM   #10
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Definitely not the most precise lol.

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98 z28 artic white. ls1, auto, free mods, slp lid, ¡egr, ¡air, ls6 intake manifold, walbro 255lph fuel pump, ceramic coated pacesetter longtube headers, pacesetter ory, magnaflow catback, 4.10:1 gears. 9.03 1/8th mile with factory 2.73s and 30psi fuel pressure.

02 firebird sunset orange metallic. v6, auto, slp lid, zzp tubing, port matched upper and lower intake manifolds.


98 z28 build thread.
http://www.camarozone.com/forum/f14/...-build-182636/
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