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Et vs Trap speed
#928589
02/14/11 04:59 AM
02/14/11 04:59 AM
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Joined: Nov 2009
Posts: 520
New Zealand
nz383man
OP
mopar
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OP
mopar
Joined: Nov 2009
Posts: 520
New Zealand
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Why is it that you can do a really good trap speed when you do a bad start, slow et or spin the tyres? Sometimes my best times have slower trap speeds than when I have a bad run or spin the tyres & I don't understand why. Can you drive differently for a quick et or fast trap speed? 
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Re: Et vs Trap speed
[Re: nz383man]
#928592
02/14/11 08:17 AM
02/14/11 08:17 AM
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Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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If you spin the car does not cover as much distance as it would have at any given point on the track with a dead hook. Therefore you have more track to cover to get to the finish line. That will let the car have more MPH at the finish line.
Jim
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Re: Et vs Trap speed
[Re: Bigcube]
#928593
02/14/11 10:01 AM
02/14/11 10:01 AM
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Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
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Re: Et vs Trap speed
[Re: Bigcube]
#928594
02/14/11 10:15 AM
02/14/11 10:15 AM
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Joined: Jul 2010
Posts: 1,491
Oologah, Oklahoma
Big Squeeze
pro stock
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pro stock
Joined: Jul 2010
Posts: 1,491
Oologah, Oklahoma
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Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
In that example, car B has a higher HP to weight ratio.........   
I, and I think just about anyone that races very much, has experienced the same thing as the OP......I don't think I've ever run my best trap speed on the same runs as my best ET.......the way I've heard it explained is that since you got to the finish line quicker, you actually had less time to build speed.......
I still have a hard time wrapping my head around that though....... 
If you can't handle the truth, you're living a lie.......
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Re: Et vs Trap speed
[Re: Big Squeeze]
#928595
02/14/11 10:26 AM
02/14/11 10:26 AM
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Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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Quote:
Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
In that example, car B has a higher HP to weight ratio.........
I, and I think just about anyone that races very much, has experienced the same thing as the OP......I don't think I've ever run my best trap speed on the same runs as my best ET.......the way I've heard it explained is that since you got to the finish line quicker, you actually had less time to build speed.......
I still have a hard time wrapping my head around that though.......
Or car B does not have an optimized chassis/motor combo. With my old motor I would dead hook, run about a 9.90 @ a 140ish with a high 1.40 sixty. Reason was with big headers, big heads and a small motor made peak TQ around 6200 but converter was around 4000 stall. But you are correct, if you spin it will ALWAYS have more MPH.
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Re: Et vs Trap speed
[Re: Bigcube]
#928596
02/14/11 10:31 AM
02/14/11 10:31 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
how do you know car A got there first?
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Et vs Trap speed
[Re: sixpackgut]
#928598
02/14/11 10:45 AM
02/14/11 10:45 AM
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Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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Quote:
Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
how do you know car A got there first?
Assuming they have identical reaction times, car A has a better 1/8 mile ET  Which it would since it had a 1/10 sec advantage in the first 60'. The getting there first was to the 1/8 in case that wasn't clear.
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Re: Et vs Trap speed
[Re: Bigcube]
#928599
02/14/11 10:54 AM
02/14/11 10:54 AM
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Joined: Mar 2010
Posts: 341
Highland beach Fl
poisondart2
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 341
Highland beach Fl
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Quote:
Quote:
Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
how do you know car A got there first?
Assuming they have identical reaction times, car A has a better 1/8 mile ET Which it would since it had a 1/10 sec advantage in the first 60'. The getting there first was to the 1/8 in case that wasn't clear.
You beat me to it  A will always win 
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Re: Et vs Trap speed
[Re: Bigcube]
#928600
02/14/11 11:05 AM
02/14/11 11:05 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Quote:
Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
how do you know car A got there first?
Assuming they have identical reaction times, car A has a better 1/8 mile ET Which it would since it had a 1/10 sec advantage in the first 60'. The getting there first was to the 1/8 in case that wasn't clear.
oh, i misread it.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Et vs Trap speed
[Re: sixpackgut]
#928601
02/14/11 11:28 AM
02/14/11 11:28 AM
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Joined: Nov 2009
Posts: 2,177
ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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sure glad thats all made up other wise my car will always be 'a ' car never lose hahaha 
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Re: Et vs Trap speed
[Re: sixpackgut]
#928603
02/14/11 12:13 PM
02/14/11 12:13 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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Quote:
Quote:
Quote:
Quote:
Here is another way to think about it. Think about 2 cars, Car A and Car B that both run 10.0.
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
When car A is at the 1/8 mile, car B is somewhere before the the 1/8. Therefore car B has more track to cover to get to the finish line at the same time as car A. Hence will need more MPH to get there at the same time. These numbers are made up but you can see that at half track car B has made up 1/2 of what it lost in the first 60' but car A still got there first.
how do you know car A got there first?
Assuming they have identical reaction times, car A has a better 1/8 mile ET Which it would since it had a 1/10 sec advantage in the first 60'. The getting there first was to the 1/8 in case that wasn't clear.
oh, i misread it.
His story, he can tell it anyway he wants 
it's ok to butt heads, just don't do it with a butthead
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Re: Et vs Trap speed
[Re: rowin4]
#928604
02/14/11 02:29 PM
02/14/11 02:29 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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 If both cars run a 10:00 flat,would not the 135 MPH car get there first? Only a question. Even if car A was faster @ the 1/8 would not car B have to be a 1/10 faster in the back half and being car B is 3 MPH faster,should he not get there first?  Being the MPH is measured in the last 66'. Now I'm not saying that right,just maybe.
Last edited by MRMOPAR570; 02/14/11 02:30 PM.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: Et vs Trap speed
[Re: MRMOPAR622]
#928605
02/14/11 02:47 PM
02/14/11 02:47 PM
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Joined: Jan 2003
Posts: 2,937
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,937
A shed in England
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If both cars run 10.0 dead and have identical reactions then it's a dead heat. Regardless of trap speed. Aint it
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Et vs Trap speed
[Re: Tig]
#928606
02/14/11 03:11 PM
02/14/11 03:11 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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MPH is power, ET is how you apply that power to the track. Two cars with identical ETs and reaction times, should be a dead heat, even if one has more mph. Due to gearing, converter, etc, one could be slow to 660, but charge hard. That car would likely mph better, but still get there no quicker.
Monte
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Re: Et vs Trap speed
[Re: sixpackgut]
#928607
02/14/11 03:37 PM
02/14/11 03:37 PM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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Quote:
Car A, 60' 1.39, 1/8 6.31, 1/4 10.0, mph 132
Car B, 60' 1.49, 1/8 6.36, 1/4 10.0, mph 135
Car C, 60' 1.46, 1/8 6.36, 1/4 10.0 mph 134
I am C on my 10.0 pass and that was in da heat!
Mopar Performance
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Re: Et vs Trap speed
[Re: nz383man]
#928608
02/14/11 03:50 PM
02/14/11 03:50 PM
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Joined: Jan 2003
Posts: 16,934
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
Why is it that you can do a really good trap speed when you do a bad start, slow et or spin the tyres?
Sometimes my best times have slower trap speeds than when I have a bad run or spin the tyres & I don't understand why.
This might be over simplification, but this is how I think of it. For the same car, power etc, if you run a slower ET (spin), then the car has more time to accelerate (with the same hp = same acceleration rate), therefore time x acceleration rate = speed (mph)
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