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| Joined: | 05-01-2005 |
| Location: | Minneapolis, Minnesota USA |
| Posts: | 572 |
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I believe the main reason for the vacuum retard had to do with reducing the spike in oxides of nitrogen that occurred on closed-throttle over-run. Something that's not usually checked during most emissions checks.
The retard also gave a smoother, more benign idle.
Overall, I think the engine runs better with the vacuum capsule blanked off. The steady-state power and torque output isn't significantly different either way, but the throttle response off idle is better without it.
Regards,
Tim Engel