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1987 Ford Bronco Virtual Dyno Chart - 335 HP / 413 lb-ft, Boost & AFR Graph
Reference · 1987-1991 BroncoAll 65 data & spec plates
Virtual Dyno chart plotting torque, power, air/fuel, and boost vs engine RPM: ~335 HP at 4734 rpm and ~413 lb-ft at 3625 rpm.
Part of 1987-1991 Ford Bronco Data & Spec Plates
This document is a Virtual Dyno (version 1.1.8) software-generated dyno chart titled "Custom CF=1.01", uploaded to a 1987 Ford Bronco gallery. The upper graph plots torque (ft-lbs, left axis) and power (HP, right axis) against engine speed from roughly 3200 to 6400 RPM. The legend indicates the data came from the log file datalog41.csv, recorded in 4th gear with a vehicle weight of 3739 lbs, tire diameter of 25.61 inches, and smoothing level 3. Peak results are 335 hp at 4734 RPM and 413 lb-ft of torque at 3625 RPM. The torque curve (dotted) starts around 410 ft-lbs, stays flat near peak until about 4200 RPM, then falls to roughly 260 ft-lbs by 6400 RPM. The power curve (solid) climbs from about 275 hp, plateaus near 335 hp between 4500 and 5000 RPM, and tapers to about 300 hp at redline. The lower graph shows the air/fuel ratio, which holds near 13.9-14.1 across the run before dipping to about 13.6 at high RPM, and boost pressure, which peaks above 18 PSI near 5100-5200 RPM and settles to roughly 17 PSI by 6400 RPM. A correction factor of 1.01 was applied.
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Frequently asked questions
- What peak horsepower and torque does this dyno chart show?
- The legend states 335 hp at 4734 RPM and 413 lb-ft of torque at 3625 RPM.
- What software generated this dyno graph?
- It was generated by Virtual Dyno version 1.1.8, using a custom correction factor of 1.01.
- What vehicle parameters were used for the Virtual Dyno calculation?
- The run used datalog41.csv in gear 4, with a vehicle weight of 3739 lbs, tire diameter of 25.61, and smoothing setting of 3.
- What boost pressure is shown during the run?
- The boost trace peaks above 18 PSI around 5100-5200 RPM and levels off near 17 PSI toward 6400 RPM.
- What air/fuel ratio was recorded during the pull?
- The air/fuel ratio stays close to 13.9-14.1 through most of the run, dropping slightly to about 13.6 near the top of the RPM range.
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