please post 1/8 and 1/4 mile times
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From: DETROIT, (formerly Eaton County, Michigan)
please post 1/8 and 1/4 mile times
Here's the deal. A friend of mine has a mustang (Mid 9's n/a) and he was saying that he can determine his 1/4 mile time and speed only by looking at the 1/8 mile times.
When he is testing and tuning he only runs 1/8 mile and can extrapolate from there. He picks up 31 mph in the last 1/8 of the 1/4. Everytime!
I was wondering if we could do the same thing in the lightning.
Can you post your Time slips?
1/8 mph
1/8 time
330 mph
330 time
1/4 mph
1/4 time
When he is testing and tuning he only runs 1/8 mile and can extrapolate from there. He picks up 31 mph in the last 1/8 of the 1/4. Everytime!
I was wondering if we could do the same thing in the lightning.
Can you post your Time slips?
1/8 mph
1/8 time
330 mph
330 time
1/4 mph
1/4 time
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From: Miami, FL
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From: Atlantic City NJ
1/8 & 1/4 time and MPH
My best (Dec.4th 2004) 6.88 1/8 mile @ 101 MPH
10.75 1/4 mile @ 127 MPH
1.52 60 Ft.
This was done on my last pass of the day @ Atco Dragway New Jersey. All throttle, no bottle. 48 degrees temp, nice dry air, good track prep.
10.75 1/4 mile @ 127 MPH
1.52 60 Ft.
This was done on my last pass of the day @ Atco Dragway New Jersey. All throttle, no bottle. 48 degrees temp, nice dry air, good track prep.
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From: Allen, TX, USA
You _cannot_ extrapolate it the same way for every vehicle.
One of the biggest variables _by far_ is street tires vs. slicks. My '90 LX (600+rwhp) Mustang would run only 94mph on street tires in the 1/8, but it would run 103 on slicks (b/c I wasn't having to pedal it the first 300'). However, it would run 133-135mph everytime through the 1/4 mile no matter if I was running street tires or slicks.
So on street tires, I would pick up ~40mph, but on slicks only ~30-32mph. This was a low-10 second capable vehicle.
The faster you go, the larger the disparity b/w 1/8th mile trap and 1/4 mile trap...that is true.
'04 Lightning
8.357 @ 86.76 1/8
12.81 @ 109.00 1/4
I would venture to say if I was running slicks I would run 88+mph in the 1/8, but probably 108 or so in the 1/4.
Another thing is that a N/A vehicle will typically not pick up as much on the top-end as a forced induction vehicle. Gearing also plays a BIG role. If you gear the vehicle for optimum 1/4 mile times, then you are often just barely running out of gear at the top end of the track. This will result in a slightly lower trap speed than it would be otherwise, but you made up for it by helping your ET the first 100-300' of the track (which is the most important part of a drag race as far as ET is concerned).
Way too many variables to make a blanket statement that "one size, fits all."
But if you look up the NHRA website, they should have some sort of extrapolated 1/8 to 1/4 chart on there. There _are_ formulas out there, but they all assume perfect gearing and traction. And even then they are different for N/A vs. Forced induction and altitude compensation.
One of the biggest variables _by far_ is street tires vs. slicks. My '90 LX (600+rwhp) Mustang would run only 94mph on street tires in the 1/8, but it would run 103 on slicks (b/c I wasn't having to pedal it the first 300'). However, it would run 133-135mph everytime through the 1/4 mile no matter if I was running street tires or slicks.
So on street tires, I would pick up ~40mph, but on slicks only ~30-32mph. This was a low-10 second capable vehicle.
The faster you go, the larger the disparity b/w 1/8th mile trap and 1/4 mile trap...that is true.
'04 Lightning
8.357 @ 86.76 1/8
12.81 @ 109.00 1/4
I would venture to say if I was running slicks I would run 88+mph in the 1/8, but probably 108 or so in the 1/4.
Another thing is that a N/A vehicle will typically not pick up as much on the top-end as a forced induction vehicle. Gearing also plays a BIG role. If you gear the vehicle for optimum 1/4 mile times, then you are often just barely running out of gear at the top end of the track. This will result in a slightly lower trap speed than it would be otherwise, but you made up for it by helping your ET the first 100-300' of the track (which is the most important part of a drag race as far as ET is concerned).
Way too many variables to make a blanket statement that "one size, fits all."
But if you look up the NHRA website, they should have some sort of extrapolated 1/8 to 1/4 chart on there. There _are_ formulas out there, but they all assume perfect gearing and traction. And even then they are different for N/A vs. Forced induction and altitude compensation.
Last edited by WA 2 FST; Apr 21, 2005 at 08:59 PM.
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From: DETROIT, (formerly Eaton County, Michigan)
Originally posted by WA 2 FST
You _cannot_ extrapolate it the same way for every vehicle.
One of the biggest variables _by far_ is street tires vs. slicks. My '90 LX (600+rwhp) Mustang would run only 94mph on street tires in the 1/8, but it would run 103 on slicks (b/c I wasn't having to pedal it the first 300'). However, it would run 133-135mph everytime through the 1/4 mile no matter if I was running street tires or slicks.
So on street tires, I would pick up ~40mph, but on slicks only ~30-32mph. This was a low-10 second capable vehicle.
The faster you go, the larger the disparity b/w 1/8th mile trap and 1/4 mile trap...that is true.
'04 Lightning
8.357 @ 86.76 1/8
12.81 @ 109.00 1/4
I would venture to say if I was running slicks I would run 88+mph in the 1/8, but probably 108 or so in the 1/4.
Another thing is that a N/A vehicle will typically not pick up as much on the top-end as a forced induction vehicle. Gearing also plays a BIG role. If you gear the vehicle for optimum 1/4 mile times, then you are often just barely running out of gear at the top end of the track. This will result in a slightly lower trap speed than it would be otherwise, but you made up for it by helping your ET the first 100-300' of the track (which is the most important part of a drag race as far as ET is concerned).
Way too many variables to make a blanket statement that "one size, fits all."
But if you look up the NHRA website, they should have some sort of extrapolated 1/8 to 1/4 chart on there. There _are_ formulas out there, but they all assume perfect gearing and traction. And even then they are different for N/A vs. Forced induction and altitude compensation.
You _cannot_ extrapolate it the same way for every vehicle.
One of the biggest variables _by far_ is street tires vs. slicks. My '90 LX (600+rwhp) Mustang would run only 94mph on street tires in the 1/8, but it would run 103 on slicks (b/c I wasn't having to pedal it the first 300'). However, it would run 133-135mph everytime through the 1/4 mile no matter if I was running street tires or slicks.
So on street tires, I would pick up ~40mph, but on slicks only ~30-32mph. This was a low-10 second capable vehicle.
The faster you go, the larger the disparity b/w 1/8th mile trap and 1/4 mile trap...that is true.
'04 Lightning
8.357 @ 86.76 1/8
12.81 @ 109.00 1/4
I would venture to say if I was running slicks I would run 88+mph in the 1/8, but probably 108 or so in the 1/4.
Another thing is that a N/A vehicle will typically not pick up as much on the top-end as a forced induction vehicle. Gearing also plays a BIG role. If you gear the vehicle for optimum 1/4 mile times, then you are often just barely running out of gear at the top end of the track. This will result in a slightly lower trap speed than it would be otherwise, but you made up for it by helping your ET the first 100-300' of the track (which is the most important part of a drag race as far as ET is concerned).
Way too many variables to make a blanket statement that "one size, fits all."
But if you look up the NHRA website, they should have some sort of extrapolated 1/8 to 1/4 chart on there. There _are_ formulas out there, but they all assume perfect gearing and traction. And even then they are different for N/A vs. Forced induction and altitude compensation.
That is why I asked for timeslips to see if there are any comparisons. Then I'll go from there. But thanks for your positive input.
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From: Charleston, SC
Re: please post 1/8 and 1/4 mile times
-------------Bristol-----Carolina
------------------------ Dragway
1/8 mph----84.34------85.49
1/8 time----8.346------8.272
330 mph
330 time----5.441-----5.398
1/4 mph----104.33----105.31
1/4 time----13.041----12.919
------------------------ Dragway
1/8 mph----84.34------85.49
1/8 time----8.346------8.272
330 mph
330 time----5.441-----5.398
1/4 mph----104.33----105.31
1/4 time----13.041----12.919
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Joined: Apr 2000
Posts: 1,173
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From: Allen, TX, USA
Originally posted by l-menace
Well that's nice and all, but first you gather all the evidence, compare it. See if there are any correlations and go from there.
That is why I asked for timeslips to see if there are any comparisons. Then I'll go from there. But thanks for your positive input.
Well that's nice and all, but first you gather all the evidence, compare it. See if there are any correlations and go from there.
That is why I asked for timeslips to see if there are any comparisons. Then I'll go from there. But thanks for your positive input.
Maybe I read the post wrong as far as what he is actually saying. I interpreted it as saying that all cars will have the same correlation from 1/8 to 1/4 mile. If that's what you're being told, that's false. If that's being negative b/c I disagree with the above premise...
That being said, if you take your average mildly modded L and compare the 1/8 mile and 1/4 mile times... sure, they'll be reasonably close. I never said it wouldn't work for _a_ particular vehicle as it relates to itself.
Flame away... better yet, research the NHRA extrapolations. They are out there b/c the NHRA has to have some way to convert 1/8 to 1/4 mile since a number of their sanctioned events are 1/8th mile...and it varies some from vehicle to vehicle, climate to climate, and type of engine (FI or N/A).
Sorry for wasting bandwidth. Maybe _someone_ will find the information useful.
Last edited by WA 2 FST; Apr 21, 2005 at 11:27 PM.
