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Second Dyno Pull Attempt & Fuel Lean-Out

5:28
19:20
53K views

At 5:28 in

LSA Supercharged 1972 Monte Carlo Hits The Dyno! Will It Survive?

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What happens here

After the transmission adjustments, a second dyno pull is performed. The transmission now holds the selected gear correctly. However, as the engine reaches higher RPMs, it begins to run lean, indicating a problem with fuel delivery. The operator observes this and immediately aborts the pull to protect the engine from potential damage. The initial reading before the pull was aborted was 543 horsepower.

Goal: Obtain a full dyno pull and power reading (unsuccessful due to fuel lean-out).

Tools and materials

  • Air-Fuel Ratio — Monitoring the fuel mixture to prevent lean conditions
  • Dynamometer Dynojet — Measuring engine power
  • Laptop with Tuning Software HP Tuners — Monitoring engine parameters during the run
  • Vehicle Chevrolet — The car being tested

What they say

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looks like it worked it held that time it didn't i had to put some pressure in it the converter was unlocking and it was dropping down so i just had to change we should be good now just got it settled on the dyno so i'm gonna look over the little flip that i've got make sure we're good and we'll rip it okay was that 5 43 yeah i'll have to flip it over and set it up see what kind of torque it made but uh that wasn't a full pull it looked like it was uh it was starting to go lean so i'm gonna try to make some make some changes to it see what's going on what rpm was that two that was [Music] that was a 67 okay it just got there really quick but we are and i pulled a bunch of timing out of it from where it was just to where we could make sure the air fuel was good problem is it's going lean showing 103 duty cycle so i don't know if we're dropping fuel pressure because we've got a port we can

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