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Post by epmurc on Apr 16, 2018 10:26:09 GMT 12
Entries so far for this week
1NZ, 21H, 21S, 36A, 52H, 53H, 63A, 78A, 78H, 89a, 193H
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Post by jimmyj on Apr 16, 2018 17:57:40 GMT 12
Quick questions.How fast does a top mod go down the back straight at waikaraka park and also a superstock in klm pr hour please ??
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Post by The other guy on Apr 16, 2018 19:57:22 GMT 12
Do the maths jimmy
Most tracks 1/4 mile
15 seconds x4 equals 60 seconds
1 mile a minute equals 60mph/ 120kph
Thats fast
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Post by jimmyj on Apr 16, 2018 20:22:11 GMT 12
Do the maths jimmy Most tracks 1/4 mile 15 seconds x4 equals 60 seconds 1 mile a minute equals 60mph/ 120kph Thats fast I didn't know what lap times they do out there so couldn't really do the maths .Taa any way. that is an average ,not straight away speed . |
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Post by theycallmewade on Apr 16, 2018 22:58:12 GMT 12
And they are not running on the 410m pole line when clocking 15 second laps. The racing line around WP is about 450m.
If a car is running on the racing line (as it needs to to go fast) and clocking 15 second laps, they are doing an average of 110kph.
The super saloon lap record is 15.8 seconds (105 kph average), so I think the mods are doing much better then 15 second laps around WP.
Ask Foxy how quick he goes when he only breaths the engine slightly at the end of the back straight and basically does not lift off on a full lap.
It is a shame that the numbers of mods have dropped off in the North Island, cause a good field of them going fast is pretty good to watch! They need more tracks running them and giving them more to race for!
Super Stocks run around WP in 17 seconds, so slower than Super saloons, saloons and mods.
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Post by orapiuwharf on Apr 16, 2018 23:36:04 GMT 12
Agree need lots more mods they are awesome at Waikaraka.
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Post by Jamo on Apr 16, 2018 23:51:26 GMT 12
And they are not running on the 410m pole line when clocking 15 second laps. The racing line around WP is about 450m. If a car is running on the racing line (as it needs to to go fast) and clocking 15 second laps, they are doing an average of 110kph. The super saloon lap record is 15.8 seconds (105 kph average), so I think the mods are doing much better then 15 second laps around WP. Ask Foxy how quick he goes when he only breaths the engine slightly at the end of the back straight and basically does not lift off on a full lap. It is a shame that the numbers of mods have dropped off in the North Island, cause a good field of them going fast is pretty good to watch! They need more tracks running them and giving them more to race for! Super Stocks run around WP in 17 seconds, so slower than Super saloons, saloons and mods. 13.80 Lap record for mods at Waikaraka. Foxy Feb 2017 13.33 lap record sprintcars at Waikaraka. Michael Pickens 2015. Little difference really. |
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Post by mod46c on Apr 17, 2018 10:06:22 GMT 12
The man did ask for the speed down the back straight, I'm not sure about Wacky but I have calculated the speed (with a few assumptions) for my Mod at WFG (which is a slower track than Wacky).
I came up with a number just under 170km/h.
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Post by Jamo on Apr 17, 2018 10:13:47 GMT 12
The man did ask for the speed down the back straight, I'm not sure about Wacky but I have calculated the speed (with a few assumptions) for my Mod at WFG (which is a slower track than Wacky). I came up with a number just under 170km/h. You think back straight at the Glen is longer than the one at Wacky Brett? Might be. I am a bit dubious about your number TBH. I calculated that based on Foxy's lap record time at Wacky that his average speed would be about 117km / hour. Allowing for the corners etc I guessed top speed down back straight would likely be about the 160km/ hour mark at best. I would be surprised if you are hitting 170km / hour top speed at the Glen. Could always be wrong though! |
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Post by brettgrace on Apr 17, 2018 10:44:53 GMT 12
What gear, rpm do you run? Pretty easy to do the maths from that really. An example:
(8000/60*(100*0.0254))/6.23*3.6
Where 8000 is peak rpm, 100 is mean tyre size (assuming 10" stagger) and 6.23 is the gear ratio. All other numbers stay as is.
195.7 km/h based on these variables, this assumes 0% slip at the tyre and a few other things but that's the core of it.
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Post by epmurc on Apr 17, 2018 11:40:38 GMT 12
I do recall a fella with a radar gun a few years back clocking Mods at about 140kph (sorry to burst a few bubbles) and according to ELS printouts, the average lap speed is usually between 102 and 105kph.
Yes, we've got a bit faster but I'd hesitate to say we're up to 160.
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Post by Jamo on Apr 17, 2018 11:55:22 GMT 12
I do recall a fella with a radar gun a few years back clocking Mods at about 140kph (sorry to burst a few bubbles) and according to ELS printouts, the average lap speed is usually between 102 and 105kph. Yes, we've got a bit faster but I'd hesitate to say we're up to 160. Some of us maybe Crumpy! Get off those brakes!  |
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Post by spuddy on Apr 17, 2018 12:13:49 GMT 12
Remember at Woodford glen years ago they had a speed gun for a night, and from memory mods were hitting 145kmh, Supers were hitting 140kmh and Stocks were around the 110-115 mark
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Post by mod46c on Apr 17, 2018 12:19:13 GMT 12
I do recall a fella with a radar gun a few years back clocking Mods at about 140kph (sorry to burst a few bubbles) and according to ELS printouts, the average lap speed is usually between 102 and 105kph. Yes, we've got a bit faster but I'd hesitate to say we're up to 160. Sorry Crumpy but radar speed measuring devices are designed for measuring cars travelling at essentially a steady state velocity, and because they need to stand up in court that take multiple measurements. So in this environment with rapid acceleration and deceleration they won't be particularly accurate, they will read low. The formula my namesake has but up, calculates the instantaneous velocity, most likely occurring very briefly in the moment prior to throttle lift and in WFG case brake application. |
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Post by epmurc on Apr 17, 2018 15:10:02 GMT 12
I'd have to label this as being one of the more informative discussions we've seen on this board for a long time. Pity it's given a couple of "know it all" engineer types a platform to show off  |
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Post by Browny89a on Apr 17, 2018 19:05:23 GMT 12
Pretty interesting discussion. Obviously dependent on a few variables (track condition, tyres etc) but without going off a formula and purely trying to relate it to road car speed I would guesstimate about 130km/h. 160km+ seems a bit far fetched personally but thats just my 10 cents worth.
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Post by jimmyj on Apr 17, 2018 19:16:59 GMT 12
What gear, rpm do you run? Pretty easy to do the maths from that really. An example: (8000/60*(100*0.0254))/6.23*3.6 Where 8000 is peak rpm, 100 is mean tyre size (assuming 10" stagger) and 6.23 is the gear ratio. All other numbers stay as is. 195.7 km/h based on these variables, this assumes 0% slip at the tyre and a few other things but that's the core of it. Introducing Mr Rocket scientist ,lol .lol I was just wondering what comparisons there would be between sprint cars,mods and midgets at wacky park seeing thaty would be the faster track between there and the springs I thought ? Any other ways we can tell MrGrace apart from rocket science ?? |
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Post by Deleted on Apr 17, 2018 21:26:41 GMT 12
What gear, rpm do you run? Pretty easy to do the maths from that really. An example: (8000/60*(100*0.0254))/6.23*3.6 Where 8000 is peak rpm, 100 is mean tyre size (assuming 10" stagger) and 6.23 is the gear ratio. All other numbers stay as is. 195.7 km/h based on these variables, this assumes 0% slip at the tyre and a few other things but that's the core of it. Introducing Mr Rocket scientist ,lol .lol I was just wondering what comparisons there would be between sprint cars,mods and midgets at wacky park seeing thaty would be the faster track between there and the springs I thought ? Any other ways we can tell MrGrace apart from rocket science ?? Hi jimmyj, if you have a lazy $360 spare you could invest in a radar speed gun. US sprinter diver Paul McMahan recorded 145 mph (234 kh) average on .44 mile track HERE. |
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Post by midway on Apr 17, 2018 21:31:23 GMT 12
mr grace may be able to tell you how many dots of nutmeg are on a Edmonds custard pie top ..  |
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Post by Deleted on Apr 18, 2018 2:51:10 GMT 12
What gear, rpm do you run? Pretty easy to do the maths from that really. An example: (8000/60*(100*0.0254))/6.23*3.6 Where 8000 is peak rpm, 100 is mean tyre size (assuming 10" stagger) and 6.23 is the gear ratio. All other numbers stay as is. 195.7 km/h based on these variables, this assumes 0% slip at the tyre and a few other things but that's the core of it. 😃Sh!t yeah Easy* as *easy MAY be a relative term, depending on many factors including but not limited to many things such as the number of fingers & toes you have at your disposal to do these easy calculations, the number of slide rules you have at arm's reach, how much beer you have consumed in the last few hours and you ability to speak gibberish. |
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