Launching
27-Mar-2003, 06:47 PM
#6
Registered User
Join Date: Mar 2003
Location: brampton
Posts: 1,033
my car launches like liek a spinning top......tires are all season michelins bald on gsr blades..soon to change....but it take practice to see what rpm your tires can launch up to...i'd say try dropping clutch at 3500 rpm....after a few brake stands to heat them up
28-Mar-2003, 12:54 PM
#8
Registered User
Join Date: Aug 2002
Location: Etobicoke
Posts: 3,662
THe best way to launch if your tires are able to grip the road... is to take your car to it's maximum hp rpm (which in my car is 6100) and dump the clutch from there... HOWEVER.. if you dump the clutch from there and your tires are pure shitty ***... (tires are one thing you should never go cheap on)... than you'll just be spinning forever and that actually makes you have a higher 1/4 mile time.
I read that the trick is to give your tires the MAXIMUM power without spinning the wheels (a slight chirp is ok). This gives it best off the line. Spinning the tires is a waste of speed and time.
You should experiment what rpms your tires can handle.
I ride on Yokohama Parada SPec-2 tires and when I am at a traffic light and I launch .. on a really cold day.. they'll slip if I dump @ 1750 rpm.. but on warmer days.. (which it hasn't been yet).. I'm sure it can be dumped higher.
I read that the trick is to give your tires the MAXIMUM power without spinning the wheels (a slight chirp is ok). This gives it best off the line. Spinning the tires is a waste of speed and time.
You should experiment what rpms your tires can handle.
I ride on Yokohama Parada SPec-2 tires and when I am at a traffic light and I launch .. on a really cold day.. they'll slip if I dump @ 1750 rpm.. but on warmer days.. (which it hasn't been yet).. I'm sure it can be dumped higher.
28-Mar-2003, 01:16 PM
#9
Registered User
Join Date: Jan 2003
Location: on a race track
Posts: 17,846
Nospleeny there are various ways to launch I'm sure if you go to a drag race event and ask pro drag racers whether they dump or feather the clutch you'll get a 50/50 split on it ..... the topic can be widely debated ..
28-Mar-2003, 01:22 PM
#10
Registered User
Join Date: Aug 2002
Location: Etobicoke
Posts: 3,662
Originally posted by gatherer
Nospleeny there are various ways to launch I'm sure if you go to a drag race event and ask pro drag racers whether they dump or feather the clutch you'll get a 50/50 split on it ..... the topic can be widely debated ..
Nospleeny there are various ways to launch I'm sure if you go to a drag race event and ask pro drag racers whether they dump or feather the clutch you'll get a 50/50 split on it ..... the topic can be widely debated ..
28-Mar-2003, 02:27 PM
#12
Registered User
Join Date: Aug 2002
Location: Etobicoke
Posts: 3,662
Originally posted by gatherer
Nospleeny thats justa recipe to spin tires.... max power isn't at max rpm.... what you want is to have the peek of your torque curve transfered to the tires....
Nospleeny thats justa recipe to spin tires.... max power isn't at max rpm.... what you want is to have the peek of your torque curve transfered to the tires....
The formula for hp == torque * rpm / 5250 or something like that. I can look it up again.
But if you want MAX power to your wheels.. it's max hp and drop the clutch from that rpm. My max rpm would be like 7200 rpm but my max hp is 6100.
I'm just saying how to get the MOST power to your wheels.
28-Mar-2003, 03:11 PM
#13
Registered User
Join Date: Jan 2003
Location: on a race track
Posts: 17,846
dude you want to get going you want to move horsepower is a function of torque and is not torque at the high end.... torque is the only thing that really matters and torque is most important in getting moving ...
here's a question for you I'll give you 2 values for torque and 2 rpm values then you tell me which rpm value you wanna match up with which torque value ...
torque values= 300 ftlbs and 600 ftlbs
rpms values = 4000 and 9000
I think this exersice will help me prove my point
here's a question for you I'll give you 2 values for torque and 2 rpm values then you tell me which rpm value you wanna match up with which torque value ...
torque values= 300 ftlbs and 600 ftlbs
rpms values = 4000 and 9000
I think this exersice will help me prove my point
28-Mar-2003, 03:31 PM
#14
Registered User
Join Date: Aug 2002
Location: Etobicoke
Posts: 3,662
Originally posted by gatherer
dude you want to get going you want to move horsepower is a function of torque and is not torque at the high end.... torque is the only thing that really matters and torque is most important in getting moving ...
here's a question for you I'll give you 2 values for torque and 2 rpm values then you tell me which rpm value you wanna match up with which torque value ...
torque values= 300 ftlbs and 600 ftlbs
rpms values = 4000 and 9000
I think this exersice will help me prove my point
dude you want to get going you want to move horsepower is a function of torque and is not torque at the high end.... torque is the only thing that really matters and torque is most important in getting moving ...
here's a question for you I'll give you 2 values for torque and 2 rpm values then you tell me which rpm value you wanna match up with which torque value ...
torque values= 300 ftlbs and 600 ftlbs
rpms values = 4000 and 9000
I think this exersice will help me prove my point
28-Mar-2003, 03:38 PM
#15
Registered User
Join Date: Jan 2003
Location: on a race track
Posts: 17,846
ok good answer flip them around and I would have had fun at your expense ... well you could have an engine that makes 600 ftlbs at 9000 and 300 ftlbs at 4000 however what do you do at 9000 rpm you shift so 600 ftlbs is not useful up there ...
anyways my point now is this do you want to redline your car and do a clutch dump at 9000 rpm where you have 300 ftlb or would you rather dump the clutch at 4000 rpm where you have a wonderful 600 ftlbs of torque to pull you out of the hole....
torque is god of the launch and the rest of the track. I think I made my point Nospleeny care to respond?
anyways my point now is this do you want to redline your car and do a clutch dump at 9000 rpm where you have 300 ftlb or would you rather dump the clutch at 4000 rpm where you have a wonderful 600 ftlbs of torque to pull you out of the hole....
torque is god of the launch and the rest of the track. I think I made my point Nospleeny care to respond?
28-Mar-2003, 03:40 PM
#16
Registered User
Join Date: Aug 2002
Location: Etobicoke
Posts: 3,662
Originally posted by gatherer
ok good answer flip them around and I would have had fun at your expense ... well you could have an engine that makes 600 ftlbs at 9000 and 300 ftlbs at 4000 however what do you do at 9000 rpm you shift so 600 ftlbs is not useful up there ...
anyways my point now is this do you want to redline your car and do a clutch dump at 9000 rpm where you have 300 ftlb or would you rather dump the clutch at 4000 rpm where you have a wonderful 600 ftlbs of torque to pull you out of the hole....
torque is god of the launch and the rest of the track. I think I made my point Nospleeny care to respond?
ok good answer flip them around and I would have had fun at your expense ... well you could have an engine that makes 600 ftlbs at 9000 and 300 ftlbs at 4000 however what do you do at 9000 rpm you shift so 600 ftlbs is not useful up there ...
anyways my point now is this do you want to redline your car and do a clutch dump at 9000 rpm where you have 300 ftlb or would you rather dump the clutch at 4000 rpm where you have a wonderful 600 ftlbs of torque to pull you out of the hole....
torque is god of the launch and the rest of the track. I think I made my point Nospleeny care to respond?
So I rather dump my clutch @ 9000 rpm.. let it use the horsepower rather than torque.. and when the wheels finally grip the ground.. I'll end up being about 4000 rpm where I get max torque, therefore.. it's easier to get back up to 9000 where I'll change gears.
28-Mar-2003, 04:41 PM
#17
torque makes you king of the street, hp makes you king of the racetrack 
Ok, I don't see what the argument is about....
NoSpleeny, you wanna glaze and scatter your clutch, that's fine, I won't complain. gatherer, you're right. Torque will give you a nice launch if you can transfer the engine torque into forward motion. NoSpleeny, yours is a recipe for disaster eventually, and if not that, its a great way to burn out your right front tire... and get mad teeth-shattering wheelhop That's make your fookin tranny wanna jump out the hood, as well as any observers shaking their head in disgust. However, torque will also smoke your tires outright if it can't get translated into forward motion. This is why RWD load up the suspension with roll control, then release and wheelie. The weight transfer in the RWD cars benefits their traction situation and they can put down 600lb/ft easy and turn in easy mid 9 second slips.
The proper way to launch depends on the type of track, tires, temps, driver, clutch, power band...
Dropping the clutch with grabby properties will bog the engine with low torque figures...
Feathering while keeping the tires slightly ahead of their adhesion properties is the optimal way to launch... and to do that, you have to practice!!
Ok, I don't see what the argument is about....
NoSpleeny, you wanna glaze and scatter your clutch, that's fine, I won't complain. gatherer, you're right. Torque will give you a nice launch if you can transfer the engine torque into forward motion. NoSpleeny, yours is a recipe for disaster eventually, and if not that, its a great way to burn out your right front tire... and get mad teeth-shattering wheelhop
That's make your fookin tranny wanna jump out the hood, as well as any observers shaking their head in disgust. However, torque will also smoke your tires outright if it can't get translated into forward motion. This is why RWD load up the suspension with roll control, then release and wheelie. The weight transfer in the RWD cars benefits their traction situation and they can put down 600lb/ft easy and turn in easy mid 9 second slips. The proper way to launch depends on the type of track, tires, temps, driver, clutch, power band...
Dropping the clutch with grabby properties will bog the engine with low torque figures...
Feathering while keeping the tires slightly ahead of their adhesion properties is the optimal way to launch... and to do that, you have to practice!!
28-Mar-2003, 04:47 PM
#18
Registered User
Join Date: Jan 2003
Location: on a race track
Posts: 17,846
bbarbulo thanks for your comments the 600 value I was using was just an example of course I don't think I'll ever see that out of my civic.... I always thought feathering was the way to go after I did a few of those teeth shattering wheel hops and needed to visit the dentist each time
28-Mar-2003, 05:02 PM
#19
Ya, I've lost fillings from improper launches 
kidding....
The 600 value is not very far off from what American muscle puts down for low 10 second, high 9 ETs which is why I used that example...
kidding....The 600 value is not very far off from what American muscle puts down for low 10 second, high 9 ETs which is why I used that example...
