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64 Foot TimesViews : 21810 Replies : 15Users Viewing This Thread : |
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#1 |
S60R/V70R
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I thought that I'd post up this article on 64 feet times with permission from the author Alan Harris. Just having a look at my times I've found a selection of times recorded in one day at an event at Combe:
2.96 2.95 2.83 2.82 2.81 So my best 64 feet with a S70R with a stage 2 MTE and complete Feritta system for that day was 2.81. I'll have a look for other times. Anybody else got official times for 64 feet standing starts? Iain 64ft TIMES Allen Harris It is increasingly common for timekeepers at speed events to set up additional sensors to trap the time taken to cover the first 64ft off the line, and a speed trap on the fastest part of the course. The value of a speed trap is obvious enough, but what can be learnt from the 64ft time? Clearly, cars with the best power/weight ratios should achieve good times, but more importantly it’s an indication of the level of traction achieved. The more wheelspin, the slower the acceleration, so the 64ft time enables the driver to check the impact of variations in starting technique. A lot also depends on whether you change up a gear in the first 64ft – if your first gear takes you past the sensor you’ll post a better time. The choice of 64ft may have something to do with the fact that a time of 2.0secs equates to an acceleration of 1g – an alluring target to aim for! Or, if you prefer, here are the figures in graphical form: ![]() The table illustrates the speeds achieved for different 64ft times, assuming constant acceleration. Make of it what you will! TIME SPEED 2.0 43.6 2.1 41.6 2.2 39.7 2.3 37.9 2.4 36.4 2.5 34.9 2.6 33.6 2.7 32.3 2.8 31.2 2.9 30.1 3.0 29.1 3.1 28.2 3.2 27.3 3.3 26.4 3.4 25.7 3.5 24.9
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2003 S60R 2003 V70R VOC Speed Challenge Champion 2007/08/Joint Winner 2009 Motor Sport Challenge Winner 2008/Joint Winner 2009 Last edited by IC; Sep 18th, 2009 at 22:00. |
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#2 |
S60 R
Last Online: Aug 2nd, 2019 11:43
Join Date: Oct 2004
Location: United Kingdom
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I was not sure of the purpose for 64ft times I get it now. I don't have all my 64ft times but the best one that I have a record of is 2.83 at the Dick Mayo Sprint Castle Combe.
This vid is an example of the timing equipment. http://www.youtube.com/watch?v=f0o-XJaoCG8 |
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#3 |
Master Member
Last Online: May 27th, 2022 22:00
Join Date: Dec 2002
Location: Lanark
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Never heard it described as 64ft times before, always 60ft, but I'm assuming it will be the same thing, all UK drag racing etc refers to it as 60ft at all strips so I assume your times IC will be a 60ft beam.
best I ever managed was 1.7-1.8 in my R32 GTR, fwd my best ever is 2.21 in my Rover turbo, managed a 2.4 in Jacqs T4, pretty sure she did a 2.3 on it once as well. also pleased to see I was over 1g in the skyline coming off the line...I could well believe it.
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Astra SRi, wifes S60 T4, and her old S40 T4 though its sat engineless for 7 years since I last updated this project link..better updates soon http://www.volvoforums.org.uk/showthread.php?t=47573 |
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#4 | |
S60 R
Last Online: Aug 2nd, 2019 11:43
Join Date: Oct 2004
Location: United Kingdom
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#5 |
Master Member
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hello,please excuse my lack of racing knollage,but why 64ft ???
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#6 |
S60R/V70R
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Hi, to quote a certain Dave Slater: "32ft per second per second, is acceleration due to gravity, so doing the 64ft times in two seconds means your'e pulling 1g IIRC" .
Iain
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2003 S60R 2003 V70R VOC Speed Challenge Champion 2007/08/Joint Winner 2009 Motor Sport Challenge Winner 2008/Joint Winner 2009 |
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The Following User Says Thank You to IC For This Useful Post: |
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#7 | |
Master Member
Last Online: May 27th, 2022 22:00
Join Date: Dec 2002
Location: Lanark
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At the same strip, Crail, my Skyline GTR did a 1.7 60ft, and a 12.6 @ 108 1/4mile off of that, my Rover could only do a 2.21 60ft, but a 12.8 @ 114mph 1/4 mile once it got grip and got going, and that was it 2 years before I sold it, it was much faster than that by the time it sold, it would still only have done a 2.1-2.2 60ft at best on crails surface, car weight and traction given from tyres is limited, once they grip then the pwoer comes into it. 4wd's can split the power between 4 points instead of 2, so they launch better, in reality my 13 year old 2 litre turbo rover would have made my R32 GTr skyline look like a milk float acceleration wise. Skyline was 340/350 bhp, Rover was 331 bhp, 296 lb/ft without gas, 380 bhp with gas. Skyline had 4wd losses and weighed 1450kg, rover had 2wd losses and weighed 1050kg. Ross. PS - once rolling it'd take a big bhp number in a scoob or evo to keep up with Jacqs t4, given the 4wd losses and extra weight, probably in the 450-500 bhp region at a guess.
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Astra SRi, wifes S60 T4, and her old S40 T4 though its sat engineless for 7 years since I last updated this project link..better updates soon http://www.volvoforums.org.uk/showthread.php?t=47573 Last edited by Ross9; Oct 23rd, 2009 at 20:04. |
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#8 |
Turbobricker
Last Online: Apr 14th, 2024 18:09
Join Date: Dec 2002
Location: Wellingborough
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In a borrowed mostly stock 740 turbo i was achieveing 2.0 second 60fts the other weekend at santapod.
Certainly amused a lot of people at how well the thing hooked and kept its nose well in the air. |
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#9 |
Gopher
Last Online: Oct 12th, 2023 15:31
Join Date: Dec 2003
Location: Southampton or Isle of Wight
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Similarly I was getting pretty much consistant 2.2secs in the 340 at the same day, shame she couldn't keep it up
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2003 S60 D5 SE 1989 340GL - Fake - Gallery Project Thread - Spare parts car turned motorsport plaything. 8 more valves, 277 more cc's Previously, a lot of various 300s |
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#10 | |
Gopher
Last Online: Oct 12th, 2023 15:31
Join Date: Dec 2003
Location: Southampton or Isle of Wight
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Doing 64ft in 2 seconds surely can't be 1g, as gravity is 32ish ft per second per second. Soooo, the first second, you have to cover 32 ft. In the second (2nd) second, you have to cover 64 ft (as speed is increasing 32ft per second, add another 32ft onto the first second), so total distance is 96ft in 2 secs to acheive 1g. Extrapolating back that'd give you... something like 1.6 seconds for a 1g average 64ft? Or have I missed something?
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2003 S60 D5 SE 1989 340GL - Fake - Gallery Project Thread - Spare parts car turned motorsport plaything. 8 more valves, 277 more cc's Previously, a lot of various 300s |
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