Borla ProXS mufflers installed, and dyno tested
After several weeks of bad weather and bad luck, I FINALLY got my T/A clone back on the dyno today.
To recap, LOW budget, Low compression 455. Unported pressed-stud HUGE chamber 66 heads, basic shortblock, Performer intake, Q-jet, HEI.
Last round of testing had the Tribal Tri-Ys (1.75" primaries) hooked up the exhaust that came on the car. That system consisted of 2.5" pipes going into 40-series 3" FlowMasters, exiting through compression bent 2" tailpipes. The transitions between sizes was abrupt and ugly.
New system is all 3", H-pipe, and Borla ProXS mufflers.
I posted a video on FB, and you should be able to view it at https://www.facebook.com/DynoTune/vi...9873204735140/
I'll have to look at my notes later, but I had to richen the carb quite a bit.
Results summary:
- Peak RWHP gain 14.44
- Peak RWTQ gain almost 9
- HP gain at 4500 rpm ~17
- TQ gain at 4500 rpm ~ 20
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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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