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PowershiftingLast Update: 10/06/2006
Powershifting - The method of gear shifting while the accelerator remains at Wide Open Throttle (WOT) position. Burn Rate - The rate of wear imposed on a component's useable wear range (i.e. contact surface of clutch disc to flywheel/pressure-plate and synchronizer to synchronizer clutch-body).
Overspeed Engagement Damage (OED) - Excessive wear induced to a synchronous component due to out-of-parameter (delta) merging speeds (rotational).
PREPARE FOR POWERSHIFTING (by Bill Boudreau)
TRANSMISSION OIL (status) - Vascular flow of oil through the porous Phosphorus-bronze (Pb) material of each synchronizer is essential for effective British Thermal Unit (BTU) heat exchange occurrence. Frequent transmission oil changes will ensure lower Pb particle levels. The ZF S6-40 6-speed transmission is lubricated by, oddly enough, engine oil. Manufacturer recommendations specify the use of GM P/N 1052931 (5w-30) or BMW P/N 07510009420 (10w-60) oil. Approximate oil capacity of the Z6-40 is 2.2 qts. FYI - the BMW 10w-60 oil is fully-synthetic and is used in the BMW M5 engine.
CLUTCH HYDRAULIC SYSTEM (status) - Weather barrier isolation between the clutch hydraulic fluid and the surrounding atmosphere is essential for preventing moisture from being absorbed by the hydroscopic fluid. The fluid reservoir features a vented twist-off cap enclosing the drop-in atmospheric moisture barrier. The "upside-down top-hat shaped" barrier acts as an atmospheric pressure equalization member responsible for preventing the occurrence of gravity induced leakage of fluid from the system. The GM clutch hydraulic fluid is a DOT 3 type with friction modifiers added.
NOTE: In an emergency situation DOT 3 brake fluid can be used as a substitute until system repairs can be made. Road TRIP Survival TIP: You can avoid being stranded by a sudden slow leak in the clutch hydraulic system by using a piece of rubber tubing and a 10mm wrench. The wrench is for moving the ECM out of the way and the tube is for transferring a small portion of brake fluid over to the clutch fluid reservoir. This temporary work-around could save you from major towing or transmission-repair bills.
POWERSHIFT TECHNIQUE (hitting the mark) - Optimize each shift-segment window-of-opportunity by full-cycling the clutch pedal completely to the floor. Utilize the firewall mat for a springboard to literally bounce the clutch pedal back off of. The clutch pedal to firewall mat strikepoint can easily be protected by laying down a few strips of 2" wide high quality electric tape. How to practice your Shift Reaction Timing: Out of vehicle - While standing and balancing on your right leg, raise your left leg 7" up off the floor. Simultaneously tap the floor with the bottom of your shoe tip and snap your right hand fingers (ring/thumb) so as to make one combined noise between the two. Match'em 30 times in a row, and you are dialed in. In vehicle - Position your seat close enough to the pedals so that depressing the clutch pedal to the floor is achieved with between 50/50 to 60/40 percent combination of knee/ankle joint deflection. Shift reaction time seems to tighten up (real nice) when approaching the 50/50 percent end. ...Just like a bassist's drum in a rock-n-roll band. Shift lever movement should initiate to the next gear at the same time you expect to hear the "thunk" of the clutch pedal tapping the mat. Warning - Shallow clutching is deadly to these transmissions when powershifting.
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ZR-1 Net Registry
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