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1987 Ford Bronco Virtual Dyno Chart - 332 WHP / 351 lb-ft at 20 PSI Boost
Reference · 1987-1991 BroncoAll 65 data & spec plates
Virtual Dyno torque/power/AFR/boost chart from CSV logs: about 332 hp at 5447 rpm and 351 lb-ft at 4290 rpm with peak boost around 13 psi.
Part of 1987-1991 Ford Bronco Data & Spec Plates
This document is a Virtual Dyno (version 1.2.3) software-generated dyno chart titled 'Custom CF=1.01', comparing two logged pulls saved as 20psi.csv and 20psi2.csv. The upper graph plots torque (lb-ft) and wheel horsepower (WHP) versus engine speed from roughly 2750 to 6500 RPM. The legend shows both runs used Gear 4, a vehicle weight of 3739 lb, and a tire diameter of 25.62 in, with smoothing set to 3. Run one (20psi.csv, red) peaked at 332 hp at 5447 rpm and 351 lb-ft at 4298 rpm; run two (20psi2.csv, blue) peaked at 331 hp at 5972 rpm and 351 lb-ft at 4220 rpm. The lower graph plots air/fuel ratio (left axis, roughly 11.7-12.6 under boost) and boost pressure (right axis, holding around 20-22 PSI through the pull) against engine speed. A reader can learn the estimated wheel horsepower and torque curves at approximately 20 psi boost, the consistency between the two runs, and the AFR and boost behavior across the RPM range for this vehicle setup.
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Frequently asked questions
- What peak horsepower is shown on this dyno chart?
- Run 20psi.csv shows 332 hp at 5447 rpm and run 20psi2.csv shows 331 hp at 5972 rpm (wheel horsepower).
- What peak torque do the runs make?
- Both runs show 351 lb-ft: 20psi.csv at 4298 rpm and 20psi2.csv at 4220 rpm.
- What vehicle parameters were used for the Virtual Dyno calculation?
- Gear 4, weight 3739 lb, tire 25.62 in, smoothing 3, and a custom correction factor (CF) of 1.01.
- What boost pressure is shown during the pulls?
- The boost trace holds roughly 20-22 PSI through most of the RPM range, consistent with the '20psi' file names.
- What air/fuel ratios are shown under load?
- The AFR traces run approximately between 11.7 and 12.6 across the pull for both runs.
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