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Originally Posted by TTS
Yes, you are suffering from a terminology problem  . The transmission, in 3rd gear is 1:1. That's like and extension of the crankshaft all the way back to the R&P. To have engine braking, there must be some gear reduction. If you neutral the transmission from 3rd you lose braking because of disconnecting the differential. |
When the modulator was connected to ported vacuum, releasing the gas pedal at 40 miles an hour still allowed the engine to instantly return to curb idle. Applying more pressure to the throttle would increase the RPM, but the vehicle still lost speed. A bit more power--and the RPM came up enough to engage the one-way clutch so the vehicle was, again, under power. Except for the smoothness of the re-engagement, it really did act like you threw the trans into neutral every time you backed off the gas pedal.
SO--while adding gear reduction will be more effective at engine braking, releasing the gas pedal should NOT allow the engine to drop completely and immediately to curb idle--the drive wheels will still turn the engine faster than that. The engine then slows the car because it's fighting it's own manifold vacuum--and that, to me, is engine braking.