drag race shifting
Racer
Joined: Dec 2003
Posts: 454
Likes: 0
From: Double Oak TX
Originally Posted by canon1414
how do you guys shift when your racing do you drop the cluch when starting and does anyone double cluch or have any other ways.
thanks mike
thanks mike
Wouldn't recommend you power shift a ZF transmission as eventually you will break syncros. I used to own an F-body and power shifted every time but when I bought the Corvette I broke two syncros shifting exactly the same way.
The downside is by not powershifting you will loose about a tenth.
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Originally Posted by psychodiagnostik
The whole "double-clutching when drag racing" buzz is totally contrived and comes from a line in the Fast and Furious flick.
Exactly.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by psychodiagnostik
Then, (this is what most folks leave out) let off the clutch pedal.
I thought the whole point of rev matching was to keep from dragging the rear tires when your clutch engages into the lower gear.
So, is it to speed up your input shaft to match it's new rpm so it slides in nicely without eating synchros?
Le Mans Master
Joined: Jan 2005
Posts: 6,116
Likes: 3
Originally Posted by CentralCoaster
???
I thought the whole point of rev matching was to keep from dragging the rear tires when your clutch engages into the lower gear.
So, is it to speed up your input shaft to match it's new rpm so it slides in nicely without eating synchros?
I thought the whole point of rev matching was to keep from dragging the rear tires when your clutch engages into the lower gear.
So, is it to speed up your input shaft to match it's new rpm so it slides in nicely without eating synchros?
You are also correct about the tires dragging. Matching revs gets the engine to the higher rpm of the lower gear BEFORE enaging the gear. If you just shift down to a drastically lower gear, the driveshaft will spin the engine faster than it was spinning in the higher gear, and the inertia of the engine will act against the drivetrain. This is known as "engine braking" and can be responsible for tires dragging if the jump in rpms is high enough.
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Originally Posted by d48mclain
Wouldn't recommend you power shift a ZF transmission as eventually you will break syncros. I used to own an F-body and power shifted every time but when I bought the Corvette I broke two syncros shifting exactly the same way.
.
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
Hey Mojo, how do you do such great burnouts? Do you have a line-lock of some sort or just fancy foot work?
You're tach seems to be way off. Mine hits the rev limiter just before 6k as I expect.
BTW, I'm starting a little collection of your videos to show my Mustang buddies.
You're tach seems to be way off. Mine hits the rev limiter just before 6k as I expect.
BTW, I'm starting a little collection of your videos to show my Mustang buddies.
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Atok, I used to have a line loc, but it went bad, so I've been doing them the old fashioned way. Dumping the clutch and then holding the brake with my left foot.
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