Question about half mile and mile racing - with forced induction lol
10-07-2015, 01:40 AM
#1
Question about half mile and mile racing - with forced induction lol I put the forced induction in the title so this wouldn't get moved, but since the majority of these "roll" cars have blowers or turbos I think I'm alright.
My question is regarding time.
At the single run mile events, how long is a typical 180-220 mph car on the throttle?
Same question at single half mile events.
Then I see this invitational meet thing where it looks like roll racing. Is that half mile? Same question as well.........how long are we looking at WOT?
My question is regarding time.
At the single run mile events, how long is a typical 180-220 mph car on the throttle?
Same question at single half mile events.
Then I see this invitational meet thing where it looks like roll racing. Is that half mile? Same question as well.........how long are we looking at WOT?
10-07-2015, 06:32 AM
#2
Well, rough calculations... let's figure an 11 second quarter mile since you aren't launching like you would at a drag strip. At the quarter, let's guess you are going a conservative 130mph, and for arguments sake, stayed at a steady 130mph the rest of the run.
The next 1/4 mile would take you roughly 6.9 seconds.
So a half mile would be less than 20 seconds at WOT, and a full mile would be closer to 30 seconds at WOT.... very rough estimates.
The next 1/4 mile would take you roughly 6.9 seconds.
So a half mile would be less than 20 seconds at WOT, and a full mile would be closer to 30 seconds at WOT.... very rough estimates.
10-07-2015, 06:21 PM
#6
9 Second Club
Obviously a lot depends on how fast the car is in the first place.
The difference between a 180mph car and 220mph car over a mile is pretty big.
180mph car I could see being over 30s, 220mph car could be in the 20-24s range for a mile.
Obviously a lot will depend on traction too, there's nowhere near the same grip available at airfields as there is a drag strip.
Mine has **** traction and even worse aero, but my most recent 1/2 mile was 16.5s at 183mph, I'd have picked up around 34mph from 1/4 to 1/2 mile.
The difference between a 180mph car and 220mph car over a mile is pretty big.
180mph car I could see being over 30s, 220mph car could be in the 20-24s range for a mile.
Obviously a lot will depend on traction too, there's nowhere near the same grip available at airfields as there is a drag strip.
Mine has **** traction and even worse aero, but my most recent 1/2 mile was 16.5s at 183mph, I'd have picked up around 34mph from 1/4 to 1/2 mile.
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10-08-2015, 08:47 AM
#8
9 Second Club
10-08-2015, 05:20 PM
#11
9 Second Club
The big problem with a car dong say 200+ that's built for a quarter....is simply that it's built for a quarter.
Now on the other hand, if you had an insanely fast car that can do a mile that also runs very very fast over a 1/4....different story
The likes of Alpha Omega would be an example of a solid all rounder...that said, searching its achievements I dont see any standing mile results for it either, longest is 1/2 mile.
Now on the other hand, if you had an insanely fast car that can do a mile that also runs very very fast over a 1/4....different story
The likes of Alpha Omega would be an example of a solid all rounder...that said, searching its achievements I dont see any standing mile results for it either, longest is 1/2 mile.
10-09-2015, 01:39 AM
#12
I was wondering if a car like Mark Carlyle's (atomicfusion) re-geared would just absolutely clean house at these roll events?
It might would need some different parts to help it last more than 6 seconds at a time, but I don't think it would take all that much away from it.
It might would need some different parts to help it last more than 6 seconds at a time, but I don't think it would take all that much away from it.
10-09-2015, 04:29 AM
#13
9 Second Club
I was wondering if a car like Mark Carlyle's (atomicfusion) re-geared would just absolutely clean house at these roll events?
It might would need some different parts to help it last more than 6 seconds at a time, but I don't think it would take all that much away from it.
It might would need some different parts to help it last more than 6 seconds at a time, but I don't think it would take all that much away from it.
Racing on glue is not the same as an airfield though. That 200mph rwd 1/4 car just isnt going to perform anywhere near the same as it will on an airfield.
Nevermind then trying to run in excess of 200mph for another 3/4 mile which would mean huge aero/stability issues. Plus that same rwd car would not be allowed to use the full on drag tyres it does in the 1/4.
Even my car still breaks loose on airfields again at 185mph at around 1/2 mile and I dont have that much power.
There are definitely multiple reasons why nobody has done or attempted long distances in full on 1/4 drag cars. And it does seem the faster the cars get over shorter distances, the less they are inclined to then run over longer distances.
10-09-2015, 08:13 AM
#14
So my curiosity is sparked here....
The TT lambos run how fast in the 1/4? 180mph? Didn't they set at one point the record for the mile at something like ~250+mph?
I know they are geared for high speed runs, plus with a motor that spins pretty high, I thought it was close to 9,000rpm... I could see how that's possible.
The TT lambos run how fast in the 1/4? 180mph? Didn't they set at one point the record for the mile at something like ~250+mph?
I know they are geared for high speed runs, plus with a motor that spins pretty high, I thought it was close to 9,000rpm... I could see how that's possible.
10-10-2015, 03:55 AM
#16
9 Second Club
Depends what you're classing as a good tyre.
Good and suitable are very different things. Big sidewall soft drag tyres are by very unstable, you just need to look at any of them getting out of shape at all, usually it results in a huge crash. The same doesnt apply to lower profile stiff sidewall tyres.
I've used various tyres over as long as 1.25mile distance, although my car was much slower back then.
But by far the worst tyres I've used over 1km distance have been my 255/50x16 Hoosier drag radials. Oddly grip at speed is poor, but worse they feel dangerous regardless of air pressure in them. At no time to they inspire confidence or feel safe on the road over say 150mph.. A few years back I had what felt to me a huge incident at just over 190mph on a standing mile where the car broke traction and stepped sideways. It was pure luck it didnt turn into a huge mess.
I've tried them on a couple of occasions since, they just feel terrible at higher speeds.
On the other hand, this year I decided to try MT DR's again, same size and even at 193mph over the 1km, these felt pretty solid the whole way.
I'd used them before years ago and they always felt good, even at lowish pressures, also used Nitto 555R's and more often Toyo 888's which always feel good.
Ony mine the Hoosiers do grip better at lower speeds though, but only a little compared to the MT DR's
At the drag strip I'd probably prefer the Hoosiers, I would never try them at anything other than 1/4 though. The sidewalls are far far too soft.
I'm pretty sure most distance events, the organisers do not allow crossply tyres anyway, they must be radials. Not sure if they have rules about tyre profile sizes etc. But IMO racing on huge soft sidewall tyres over longer distances is just suicidal.
Not sure what the Lambo's run over the 1/4, but Alpha Omega is running in excess of 190 at the drag strip, this would be lower on an airfield though
But I think the GTR does run more 1/4's than any of the Lambos ? Drag racing doesnt seem to be as big a thing for them ?
edit, just looked on youtube, first Lambo video that popped up was low 8's at 181mph and that's 2 years ago, so there must be faster out there now
Good and suitable are very different things. Big sidewall soft drag tyres are by very unstable, you just need to look at any of them getting out of shape at all, usually it results in a huge crash. The same doesnt apply to lower profile stiff sidewall tyres.
I've used various tyres over as long as 1.25mile distance, although my car was much slower back then.
But by far the worst tyres I've used over 1km distance have been my 255/50x16 Hoosier drag radials. Oddly grip at speed is poor, but worse they feel dangerous regardless of air pressure in them. At no time to they inspire confidence or feel safe on the road over say 150mph.. A few years back I had what felt to me a huge incident at just over 190mph on a standing mile where the car broke traction and stepped sideways. It was pure luck it didnt turn into a huge mess.
I've tried them on a couple of occasions since, they just feel terrible at higher speeds.
On the other hand, this year I decided to try MT DR's again, same size and even at 193mph over the 1km, these felt pretty solid the whole way.
I'd used them before years ago and they always felt good, even at lowish pressures, also used Nitto 555R's and more often Toyo 888's which always feel good.
Ony mine the Hoosiers do grip better at lower speeds though, but only a little compared to the MT DR's
At the drag strip I'd probably prefer the Hoosiers, I would never try them at anything other than 1/4 though. The sidewalls are far far too soft.
I'm pretty sure most distance events, the organisers do not allow crossply tyres anyway, they must be radials. Not sure if they have rules about tyre profile sizes etc. But IMO racing on huge soft sidewall tyres over longer distances is just suicidal.
Not sure what the Lambo's run over the 1/4, but Alpha Omega is running in excess of 190 at the drag strip, this would be lower on an airfield though
But I think the GTR does run more 1/4's than any of the Lambos ? Drag racing doesnt seem to be as big a thing for them ?
edit, just looked on youtube, first Lambo video that popped up was low 8's at 181mph and that's 2 years ago, so there must be faster out there now
10-10-2015, 07:05 AM
#18
I run Toyo R888s and while I'm not doing 1/2 mile or full mile events, at speed, they feel great and solid. I can't say the same about the drag radials I've ran in the past. So I give up some first gear traction for better high speed handling.
10-10-2015, 07:27 AM
#19
9 Second Club
I've run the MT's and Nittos as low as 18-20psi over a mile and they both felt very stable. Was too lazy to pump them up as the electric pump was taking ages and the track was stopping running for the finals soon lol.
But even the Hoosier DR's at 25psi felt dangerous. I was shocked when I compared the two side by side this year. The sidewalls on the MT DR's are very stiff and tyres much much heavier than the Hoosier, so it's no surprise the Hoosiers felt so bad
In 2014 over the 1km at no point on the track would the Hoosiers grip which was a bit odd. I had to abandon all runs as I still had no grip beyond 180mph and it was just dangerous.
Switched from 255/50x16 Hoosiers to my road 235/45x17 888's and it had much better grip everywhere, and could almost use full throttle in 5th to 180+ with decent grip.
This year 2015 I only used the MT DR's, never bothered with the 888's as the MT's felt and gripped pretty good.
I can only imagine a tall sidewall tyre or worse crossply/wrinkle would feel lethal at any sorts of speeds over distance or on an airfield.
Watching some GTR's here using a radial/wrinkle F/R going up the runway, they look dangerous. At least they used radials all round for the 1km. Although one of them spun here a couple of years ago for no apparent reason at around 170-180mph
Cant recall what tyres it was using, but you can see on the camera it's weaving a lot as if it has wrinkles out back ( although they'd be a lower profile than big drag tyres )
Although it seems to have lost control just as he let off over the 1km line.
But even the Hoosier DR's at 25psi felt dangerous. I was shocked when I compared the two side by side this year. The sidewalls on the MT DR's are very stiff and tyres much much heavier than the Hoosier, so it's no surprise the Hoosiers felt so bad
In 2014 over the 1km at no point on the track would the Hoosiers grip which was a bit odd. I had to abandon all runs as I still had no grip beyond 180mph and it was just dangerous.
Switched from 255/50x16 Hoosiers to my road 235/45x17 888's and it had much better grip everywhere, and could almost use full throttle in 5th to 180+ with decent grip.
This year 2015 I only used the MT DR's, never bothered with the 888's as the MT's felt and gripped pretty good.
I can only imagine a tall sidewall tyre or worse crossply/wrinkle would feel lethal at any sorts of speeds over distance or on an airfield.
Watching some GTR's here using a radial/wrinkle F/R going up the runway, they look dangerous. At least they used radials all round for the 1km. Although one of them spun here a couple of years ago for no apparent reason at around 170-180mph
Cant recall what tyres it was using, but you can see on the camera it's weaving a lot as if it has wrinkles out back ( although they'd be a lower profile than big drag tyres )
Although it seems to have lost control just as he let off over the 1km line.
