Times and Distances
Dec 9, 2001, 05:07 PM
#1
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Times and Distances
Often people post things like 13s at 108mph. What exactly does that mean? It takes them 13s to reach that speed over a 1/4 mile? Or is that something else?
Also, what are typical performance figures? Do you (US) use 1/4 mile, 0-60 or top speed as well? Do you use mile times or 1/2 mile times as well?
Thanks for your education
Also, what are typical performance figures? Do you (US) use 1/4 mile, 0-60 or top speed as well? Do you use mile times or 1/2 mile times as well?
Thanks for your education
Dec 9, 2001, 05:30 PM
#2
In the US we use 0-60 and 1/4 mile as the general benchmarks for straight line performance. When someone writes 13s at 108mph what they're talking about is their 1/4 mile performance.
The "13s" means they finished the 1/4 mile somewhere in the 13 second range. The 108mph is called the trap speed, which is the speed at which you cross the line. The higher the number the more power you're generally making. A higher trap speed does not mean a faster 1/4 mile time though.
The most important part of a 1/4 mile time is the launch... something the Evo can do well as it has 4WD
A good indicator of this is the 60ft time (how fast (in seconds) the car gets through the first 60ft). It actually takes a lot of skill to launch a car with the right amount of wheelspin to optimize this.
After the launch you want to make fast shifts. Many people do what's called power shifting, which is when you keep you foot flat on the gas and make a super quick upshift. This usually gets a small jump in the rpms and helps maintain momentum. For most people it's not worth it because it may only be a difference of .01 seconds and is really hard on the drivetrain.
Mark
The "13s" means they finished the 1/4 mile somewhere in the 13 second range. The 108mph is called the trap speed, which is the speed at which you cross the line. The higher the number the more power you're generally making. A higher trap speed does not mean a faster 1/4 mile time though.
The most important part of a 1/4 mile time is the launch... something the Evo can do well as it has 4WD
A good indicator of this is the 60ft time (how fast (in seconds) the car gets through the first 60ft). It actually takes a lot of skill to launch a car with the right amount of wheelspin to optimize this.After the launch you want to make fast shifts. Many people do what's called power shifting, which is when you keep you foot flat on the gas and make a super quick upshift. This usually gets a small jump in the rpms and helps maintain momentum. For most people it's not worth it because it may only be a difference of .01 seconds and is really hard on the drivetrain.
Mark
Dec 9, 2001, 07:22 PM
#3
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Posts: n/a
I find the Evo kinda hard to launch because the clutch slips if you clutch in above 4,000 - 4,500 rpms. And it smells, well, I guess you know what it smells like. 
And just a little below that you are off boost. Dont wanna try it too often before my new clutch gets here either...
In France, they usually measure 0 - 100 kmh (0 - 62 mph), 400 metres and 1km (1000 metres). 400 metres is approx 1/4 mile (0.2485 miles or 437.4 yards instead or 440).
Dont US automotive testers measure any distance longer than 1/4 mile? I guess you dont go for the whole mile because every car would have reached top speed by then anyway...
BTW, 400m on a standard Evo 6 was measured at 13.1 by a French magazine, same time as the M5. Which means the clutch is a POS.
And just a little below that you are off boost. Dont wanna try it too often before my new clutch gets here either...In France, they usually measure 0 - 100 kmh (0 - 62 mph), 400 metres and 1km (1000 metres). 400 metres is approx 1/4 mile (0.2485 miles or 437.4 yards instead or 440).
Dont US automotive testers measure any distance longer than 1/4 mile? I guess you dont go for the whole mile because every car would have reached top speed by then anyway...
BTW, 400m on a standard Evo 6 was measured at 13.1 by a French magazine, same time as the M5. Which means the clutch is a POS.
)
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