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#1
08-27-2015, 11:22 PM
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Dyno tuning today
I've had my 67 Firebird now for about 14 years and up until today I had no idea what kind of power she has. So today I took her up to the dyno tuners and found out I have 273 hp and 358 ftlbs of torque. Not bad for a 65 389 that I have no idea what if anything has ever been done to it. The only givens are a Holly 650 double pumper, edelbrock performer rpm intake, full length headers and a full flowmaster system.
https://youtu.be/UmKDccwIJpU
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67 Firebird Convertible |
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#2
08-27-2015, 11:30 PM
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those look like some solid numbers. she's running good!
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#3
08-28-2015, 02:20 AM
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The number you have there are just about correct for a stock engine in that size. A 65 389 should have right at 350 Gross HP. which would be about 275 HP at the wheels. So just about right. Now remember gross is measured at the crank without the alt. or P/S hooked up & net is what you got at the wheels with everything hooked to it.
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#4
08-28-2015, 06:48 AM
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Yup, right where it should be, and you can also see very clearly why shifting above 5200 will only serve to slow you down!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#5
08-28-2015, 11:15 AM
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Good to know it's pretty much where it should be.
I need to dial in the accelerator pumps a little more to get rid of some hesitation but other then that I'm pretty happy with the results. The next thing may be a set of heads.
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67 Firebird Convertible |
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#6
08-29-2015, 01:55 AM
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Looks pretty good. Slightly lean, maybe go up 2 or 3 jet sizes on the secondaries. Should run very well.
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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#7
08-29-2015, 10:33 PM
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Thanks Lee. I wasnt sure if I needed to go up or down.
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67 Firebird Convertible |
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