March 6, 2014
Hi Robert
I have a question for you, what’s the best way of drag racing on a automatic tranny? Everytime I take off my tyres always spins off and I always lose traction. What’s the best way to do it? I have a Holden Commodore VZ SS.
Rae E., Australia
____
Hello Rae,
The good news is an automatic is easier to launch due to consistency and only one pedal to manage.
Your main concerns are managing available traction from your tires with the available friction of the pavement and how the engine power utilized.
A warmed up tire will provide more grip than a cold tire. But if too hot it will be slippery as well. Optimally, spinning a street tire to just where it starts to smoke usually brings it up to an ideal temperature by the time you are ready to launch at your race. The other benefit is this also cleans the
tire of debris that can compromise grip.
The launch technique that works the best is called a brake torque while the transmission is in Drive. Hold the vehicle in place with brake applied with the left foot and press the throttle with the right foot. This also improves your reaction time, assuming you’re using a Christmas Tree, a flagger, etc.
At this point is where engine response and available traction dictate how high you initially raise the engine rpm. Street tires and the power of your engine will easily overcome available traction if the engine rpm are too high, producing too much power for available grip.
My suggestion is to raise your rpm just above idle, release the brake and as soon as you start rolling forward, apply full throttle. Available traction will determine how high you can raise the rpms for the quickest launch possible with the available traction. Practice so you get a feel for your throttle response, reaction time, tire temperature, and available surface grip.
Good luck and let me know how you do!
Robert Eckaus
San Jose Cars Examiner
Showing posts with label drag race. Show all posts
Showing posts with label drag race. Show all posts
Wednesday, July 20, 2016
Monday, July 18, 2016
What car magazines should measure part 2 the Sixty Foot
Originally published February 3rd, 2013.
On weekends and weekdays throughout the year, thousands of amateur drag racers take their daily driven vehicles to the dragstrip to see how quick their car, truck or SUV is and who they can beat while finding out. It is great fun and a licensed driver can do it in any vehicle, minivans included! But the key to a great elapsed time is the “launch”.
When enthusiasts read magazine test results that don’t reflect their personal experience, or especially when it comes to rivalries, they lose interest. What would be ideal is to learn what a vehicle is capable of which would also tell if the published test result is the best potential run.
The launch is revealed to the racers on a printed timeslip handed out at the end of each ¼ mile race. The key measurement for the launch is the time it takes the vehicle to reach sixty feet. The difficult part is managing the available surface traction, tire grip and vehicle power. This is not related to the reaction time.
On street tires from the factory, the starting range is roughly very low 1.6x seconds for an exceptionally quick all wheel drive car. The upper range varies wildly and that is why we want to know what we can strive for. Is 2.0 seconds obtainable or is 2.2 the best we can expect? For every tenth of a second reduction, it translates to two tenths reduced overall in the quarter mile. Now you see why the times can vary wildly.
The thirteen second range, which is a decently quick street car compared to the masses, requires a helmet. Blow your launch, run 14s and now you’re “slow” like everyone else and all the spectators are saying you can’t drive…
Rear wheel and front wheel drive car owners and enthusiasts are the ones to gain the most here. Granted all-wheel drive vehicles can potentially launch harder, but the transmission and the gear ratios must allow for it along with engine power output. What if the car is capable of 1.8 second 60ft times and you’re only getting 2.0s? What can you do better? The magazines ought to provide this metric so owners know what to strive for and what the competition can do. Remember, there are thousands across the US doing this nearly every week, weather permitting. This is an opportunity to capture more subscribers.
The number of participants is far greater than those fortunate enough to track their cars on road circuits but we always read about threshold/emergency braking distances, handling, skidpad results and lap times. That is invaluable data, but it’s time to add another dimension that even more of us can relate to.
On weekends and weekdays throughout the year, thousands of amateur drag racers take their daily driven vehicles to the dragstrip to see how quick their car, truck or SUV is and who they can beat while finding out. It is great fun and a licensed driver can do it in any vehicle, minivans included! But the key to a great elapsed time is the “launch”.
When enthusiasts read magazine test results that don’t reflect their personal experience, or especially when it comes to rivalries, they lose interest. What would be ideal is to learn what a vehicle is capable of which would also tell if the published test result is the best potential run.
The launch is revealed to the racers on a printed timeslip handed out at the end of each ¼ mile race. The key measurement for the launch is the time it takes the vehicle to reach sixty feet. The difficult part is managing the available surface traction, tire grip and vehicle power. This is not related to the reaction time.
On street tires from the factory, the starting range is roughly very low 1.6x seconds for an exceptionally quick all wheel drive car. The upper range varies wildly and that is why we want to know what we can strive for. Is 2.0 seconds obtainable or is 2.2 the best we can expect? For every tenth of a second reduction, it translates to two tenths reduced overall in the quarter mile. Now you see why the times can vary wildly.
The thirteen second range, which is a decently quick street car compared to the masses, requires a helmet. Blow your launch, run 14s and now you’re “slow” like everyone else and all the spectators are saying you can’t drive…
Rear wheel and front wheel drive car owners and enthusiasts are the ones to gain the most here. Granted all-wheel drive vehicles can potentially launch harder, but the transmission and the gear ratios must allow for it along with engine power output. What if the car is capable of 1.8 second 60ft times and you’re only getting 2.0s? What can you do better? The magazines ought to provide this metric so owners know what to strive for and what the competition can do. Remember, there are thousands across the US doing this nearly every week, weather permitting. This is an opportunity to capture more subscribers.
The number of participants is far greater than those fortunate enough to track their cars on road circuits but we always read about threshold/emergency braking distances, handling, skidpad results and lap times. That is invaluable data, but it’s time to add another dimension that even more of us can relate to.
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