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#81
04-28-2017, 08:11 AM
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I mentioned tachometer accuracy earlier. Yesterday I put my '73 Firebird (T/A clone) on the dyno. The tach function on the dyno has proven to be quite accurate over the years, so I trust it.
The factory tachometer read about 400 rpm higher than what the dyno indicated.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/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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#82
04-28-2017, 01:55 PM
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Interesting. I'll check it with the dyno when the time comes. I've got a new Autometer tach. I also have a very old Sears multi-meter (the old ones with dwell, tach, etc). My tach and that gauge are the same.
50 year old factory tachs would be a different story!
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Adam __________________ 1964 LeGTO 469, M21, 3.42 __________________ Sold: 1968 Pontiac LeMans Convertible See it go HERE |
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