. Only pointing out what I have seen. 
Lets talk Trap Speed.
9 Second Club
Joined: Nov 2002
Posts: 1,295
Likes: 1
From: VA
engine output and gearing among other things (weather,tire width,tire pressure,aerodynamics,weight etc, etc) all affect mph...
a low torque engine slight spin will = more mph
helps it overcome its lack of power...gearing,stall also will affect this
dead hook the same car and mph will be lower..there again depending on gearing and stall etc.
good torque motor dead hook would= more mph unless improperly geared as mentioned above etc.
big torque motor spin will nominally slow mph..since in essence track is shortened and usually when a motor with good power spins it just doesnt slip the tires lightly. when it breaks loose its alot more drastic
its tit for tat..but hp has no direct affect on mph unless everything is ideally setup... one car could mph with spin while another may not depends on setup
a low torque engine slight spin will = more mph
helps it overcome its lack of power...gearing,stall also will affect this
dead hook the same car and mph will be lower..there again depending on gearing and stall etc.
good torque motor dead hook would= more mph unless improperly geared as mentioned above etc.
big torque motor spin will nominally slow mph..since in essence track is shortened and usually when a motor with good power spins it just doesnt slip the tires lightly. when it breaks loose its alot more drastic
its tit for tat..but hp has no direct affect on mph unless everything is ideally setup... one car could mph with spin while another may not depends on setup
Ill add my example:
Last time at the track...10.90s @ 125 et streets
11.50s @126 Nittos (spinning)
As you can see not to big of a difference in mph even though my 60ft was abour 4 tenths slower.... If I were to point a finger on what caused the mph difference it would be alot softer et streets, compared to the nittos.
Last time at the track...10.90s @ 125 et streets
11.50s @126 Nittos (spinning)
As you can see not to big of a difference in mph even though my 60ft was abour 4 tenths slower.... If I were to point a finger on what caused the mph difference it would be alot softer et streets, compared to the nittos.
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Staging Lane
Joined: Nov 2003
Posts: 75
Likes: 0
you get higher traps when spinning because of the momentum imparted on the car when the tires grab. You built up a lot of energy in the drivetrain when the rpm's went up. that energy is transferred to the car when the tires grab and the higher mph is essentially due to this "lurch" that you feel when the tires grab. that's how the calculations woork. Your final trap speed is just an average speed over a set distance before and after the actual 1/4 mile mark. So no matter how much you spin that number is accurate.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
It's pretty simple really. Some M6 guys see higher traps when they spin a bit due to not bogging. Now, you very well can have the best of both worlds, not bogging and not spinning, IF you have the car geared correctly and know how to launch it. This will yeild the best ET AND the best trap speed.
For the auto drivers, use a converter that gets you into the power early (this means no bog) and don't spin. There is your best ET and your best MPH.
From my experience, one normally losses VERY little trap speed, if any, when going to a comparable sized slick from a radial even assuming that there was no traction problem with either. If there was a traction problem with the radial and not with the slick, then the MPH will likely be higher with the slick. Note: I'm talking about in the case of auto tranny cars or M6 cars that are correctly geared and driven.
For the auto drivers, use a converter that gets you into the power early (this means no bog) and don't spin. There is your best ET and your best MPH.
From my experience, one normally losses VERY little trap speed, if any, when going to a comparable sized slick from a radial even assuming that there was no traction problem with either. If there was a traction problem with the radial and not with the slick, then the MPH will likely be higher with the slick. Note: I'm talking about in the case of auto tranny cars or M6 cars that are correctly geared and driven.
