Dou­ble-clutch­ing

Street Trucks - - WORD ON THE STREET -

ALL RIGHT, LET’S GET “THE FAST AND THE FU­RI­OUS” QUOTE OUT OF THE WAY: “YOU AL­MOST HAD ME? You never had me; you never had your car! Granny shiftin’, not dou­ble clutchin’ like you should … You’re lucky that hun­dred shot of NOS didn’t blow the welds on the in­take!” Aww, yeah. Whether you’re driv­ing an old truck with a non-syn­chro man­ual tranny, or are just try­ing out some rac­ing tech­niques for smoother shift­ing, dou­ble-clutch­ing might not only be use­ful, but down­right nec­es­sary depend­ing on what you’re driv­ing.

When deal­ing with syn­chro­nized or non-syn­chro­nized man­ual trans­mis­sions, dou­ble-clutch­ing is essen­tially the same: Push in the clutch pedal; shift into neu­tral in­stead of di­rectly into the next gear; re­lease the clutch pedal; en­gage it once more; then move your gear lever into the next gear.

If used in a rac­ing sit­u­a­tion with a syn­chro­nized trans­mis­sion, you’re do­ing it while blip­ping the throt­tle right be­fore down­shift­ing to match the en­gine rpms to where they should be for the gear you’re go­ing into, which eases driv­e­train shock and gives you a smoother gear tran­si­tion.

With old non-syn­chro tran­nies, you also want to try to match the rpms when­ever needed to avoid grind­ing the gears, but some folks will par­tially en­gage the clutch for a second to force the trans­mis­sion to match the en­gine speed.

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