2005 Pontiac Gto

Jim Moran will be handling the dyno tuning for our '05 GTO. "Unlike LS1s, LS2s seem to like a little more fuel on the top end," Jim explains. He starts out by increasing the idle speed, along with the startup and base airflow tables. The rev limiter is raised to 7,000 rpm, catalytic overtemp is disabled and the power enrichment eq. ratio is initially set at 1.18. Then Jim moves on to the main spark table and brings WOT timing to 22 degrees at peak torque, and 27 degrees at peak horsepower, blending into the surrounding cells. Timing at idle is also increased to the 24-27degree range. The PE spark advance correction table is zeroed out and the IAT spark advance correction table is adjusted to be less aggressive. Cat lightoff spark is also zeroed out. After that, torque management is reduced or removed along with skip shift, cooling fan duty cycle is increased and the car is ready to be started and brought up to temperature. Once it is in closed loop, Moran monitors the fuel trims and makes adjustments to bring them slightly negative. At that point the Goat is ready for a WOT pull, and the air/fuel ratio will be monitored/adjusted--so will the timing table if there are any areas that are getting knock retard. Once the tune is zeroed in (and if we had an auto), he would set the shift points on the dyno.

2005 Pontiac GTO - LS2 Heads/Cam Swap

Jim Moran will be handling the dyno tuning for our '05 GTO. "Unlike LS1s, LS2s seem to like a little more fuel on the top end," Jim explains. He starts out by increasing the idle speed, along with the startup and base airflow tables. The rev limiter is raised to 7,000 rpm, catalytic overtemp is disabled and the power enrichment eq. ratio is initially set at 1.18. Then Jim moves on to the main spark table and brings WOT timing to 22 degrees at peak torque, and 27 degrees at peak horsepower, blending into the surrounding cells. Timing at idle is also increased to the 24-27degree range. The PE spark advance correction table is zeroed out and the IAT spark advance correction table is adjusted to be less aggressive. Cat lightoff spark is also zeroed out. After that, torque management is reduced or removed along with skip shift, cooling fan duty cycle is increased and the car is ready to be started and brought up to temperature. Once it is in closed loop, Moran monitors the fuel trims and makes adjustments to bring them slightly negative. At that point the Goat is ready for a WOT pull, and the air/fuel ratio will be monitored/adjusted--so will the timing table if there are any areas that are getting knock retard. Once the tune is zeroed in (and if we had an auto), he would set the shift points on the dyno. View Related Article

2005 Pontiac Gto

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