1/4 and 1/8 Mile Racing Talk about track times, launch techniques, strategies, etc. Check out the "Timeslips" subforum for posted times.No discussion of street racing will be tolerated.

what is the right way?

Thread Tools
 
Search this Thread
 
Old Nov 12, 2002 | 12:06 AM
  #1  
Playboycutie69
Guest
 
Posts: n/a
what is the right way?

Is it better to powershift(keeping ur foot on the gas)when racing? Or is it beteer to take ur foot of the gas then shift and put ur foot back on the gas as usual? Which one makes you move faster and get the fastest times? And wtf is double clutching?
Old Nov 12, 2002 | 07:07 AM
  #2  
Jamsan's Avatar
Senior Member
iTrader: (2)
 
Joined: Apr 2002
Posts: 2,958
no expert at all on manuals, but here goes my .02

-powershifting is faster (if you do it right), but is hella more damaging to your tranmission...id say stick with letting the foot off the cluch

-double clutching... ...somebody's been watching 2 much fast and the furious....basically, say your at a stop...you engage the clutch, then you slowly dis-engage it, then lift it to the point where it would normally move forward, and rengage it fully....there is no such thing as double clutching for race purposes.
Old Nov 12, 2002 | 08:25 PM
  #3  
Nealoc187's Avatar
SLOW
iTrader: (23)
 
Joined: Mar 2001
Posts: 14,617
From: West burbs, Chicago
Originally posted by Jamsan
no expert at all on manuals, but here goes my .02

-powershifting is faster (if you do it right), but is hella more damaging to your tranmission...id say stick with letting the foot off the cluch

In powershifting you DO let off the clutch, its the gas that you don't let off. Powershifting will lower your times slightly in general, though its possible to get too much wheelspin when powershifting, and actually make your times worse. I don't powershift the 1-2 shift otherwise I get too much wheelspin, but I do powershift to 2-3 and 3-4 shift.
Old Nov 12, 2002 | 08:49 PM
  #4  
Playboycutie69
Guest
 
Posts: n/a
Originally posted by Jamsan
no expert at all on manuals, but here goes my .02

-powershifting is faster (if you do it right), but is hella more damaging to your tranmission...id say stick with letting the foot off the cluch

-double clutching... ...somebody's been watching 2 much fast and the furious....basically, say your at a stop...you engage the clutch, then you slowly dis-engage it, then lift it to the point where it would normally move forward, and rengage it fully....there is no such thing as double clutching for race purposes.
Is it harmful to your transmission as said above.
Old Nov 19, 2002 | 11:36 PM
  #5  
MaximaRox's Avatar
Senior Member
iTrader: (1)
 
Joined: Feb 2002
Posts: 457
double clutching is used when downshifting to do rev-matching. for example, if you are cruising at 50 in 4th (say 1500rpm) and you want to shift to 3rd (say 2500rpm). now if you downshift, you need to match your engine rpm to prevent the car from lurching or jerking. this is called rev-matching and one way to do that is double clutching. the way to do it is, depress your clutch to disengage your engine from the wheels, move shifter to neutral, release clutch, blip the throttle slightly, just enough to rev up your engine to the rpms it should be at in 3rd (in our example it is 2500, so you blip the throttle till the revs climb from 1500 to 2500), depress clutch again, shift to 3rd and release clutch.
to sum it up, double clutching is:
depress clutch -> shift to neutral -> release clutch -> blip throttle to rev match -> depress clutch -> shift to desired gear -> release clutch -> apply throttle
this entire process can be executed very quickly when you get yourself familiarized to it.
Old Nov 20, 2002 | 09:17 AM
  #6  
ADAMEDWARD
Guest
 
Posts: n/a
POWERSHIFTING

From my racing various cars I can tell you that powershifting absolutely does lower e.t. if done right. But beware if you do mess up you might blow something. With the right tires(200 or lower rating) on a max you can probably shave off a few tenths, even more if you have major work done like a cam. But for the average driver it is not worth the risk.
Old Nov 20, 2002 | 09:28 AM
  #7  
SteVTEC's Avatar
Dyno plot says I have the most area under the Administrator curve
 
Joined: Jul 2001
Posts: 7,064
sometimes pictures, or even videos, speak a thousand words

Single clutch, rev-matched downshifts 7.4 MB (right click, save as)
Double-clutching 15.9 MB (right click, save as)

And no that is not my car!

http://playground.sun.com/greg/




All times are GMT -7. The time now is 03:38 AM.