Discussion
Hi,
Try www.vmax15000bhp.com - the official site.
It'll explain a bit - and I guess if you try reading some of the threads I would imagine that you'll pick the jist up...
Try www.vmax15000bhp.com - the official site.
It'll explain a bit - and I guess if you try reading some of the threads I would imagine that you'll pick the jist up...
Out of interest, is it a rolling start on to the main 2 mile straight, or is it standing start from the beginning of the straight ?
Only reason I ask is that we were there recently and I'm interested to compare 2 of our cars top speeds (done on GPS) against the ones on another thread showing the recent results for the Vmax Extreme.
Daz
Only reason I ask is that we were there recently and I'm interested to compare 2 of our cars top speeds (done on GPS) against the ones on another thread showing the recent results for the Vmax Extreme.
Daz
DazGTR said:
Out of interest, is it a rolling start on to the main 2 mile straight, or is it standing start from the beginning of the straight ?
Only reason I ask is that we were there recently and I'm interested to compare 2 of our cars top speeds (done on GPS) against the ones on another thread showing the recent results for the Vmax Extreme.
Daz
It's a rolling start, but don't compare the speeds of this event as there was a very strong head-wind most of the day. Obviouly it makes quite a difference where the timing beams are too, which is difficult to compare at difference events I'd have thought.
Most of those attending had loads of fun FWIW!
stub said:
It's a rolling start, but don't compare the speeds of this event as there was a very strong head-wind most of the day. Obviouly it makes quite a difference where the timing beams are too, which is difficult to compare at difference events I'd have thought.
Most of those attending had loads of fun FWIW!
Fair point regarding the conditions, etc. Just I was at Bruntingthorpe 2 days ago - in horrendously wet conditions and I was interested to see how our top performers did in the wet (and I mean SOAKING wet ... as it was pouring down a lot of the day) from a standing start as opposed to some of the results from VMax Extreme.
We weren't on just a top speed day ... it was 0-60, 0-100, 1/4 mile and top speed (over whatever distance you were prepared to run).
It was my first time at Brunters, my first time ever launching my car, and if I'm honest, i was a touch nervous - because it was SO wet (plus, Don Palmer had some driver training which used a large portion of the 2 mile straight).
The times / speeds on our event were all recorded using Datron GPS equipment.
Great place though ... and I'm definitely hoping to go back when it's dry.
Daz
Daz,
We run around the corner onto the straight, to save the wear on the cars caused by a standing start and also because it's more fun using the corners (and it means we also congregate on the other straight parallel to the runway, rather than at the start).
In terms of speeds, it makes almost no difference, on one of the Vmaxs I tested it both ways and the difference was only 1mph at the timing beams.
What results did you get?
Guy
We run around the corner onto the straight, to save the wear on the cars caused by a standing start and also because it's more fun using the corners (and it means we also congregate on the other straight parallel to the runway, rather than at the start).
In terms of speeds, it makes almost no difference, on one of the Vmaxs I tested it both ways and the difference was only 1mph at the timing beams.
What results did you get?
Guy
GuyR said:
Daz,
We run around the corner onto the straight, to save the wear on the cars caused by a standing start and also because it's more fun using the corners (and it means we also congregate on the other straight parallel to the runway, rather than at the start).
In terms of speeds, it makes almost no difference, on one of the Vmaxs I tested it both ways and the difference was only 1mph at the timing beams.
What results did you get?
Guy
Hi Guy - how are you mate ?
That's a fair point regarding heavy launches - definitely saves putting additional stresses on the transmission.
This was my first time ever launching the car ... and I overheated the clutch on my 2nd run (holding it for too long) and had severe clutch slip in every gear on that run ... shame as it was a reasonably good launch (albeit a bit sideways). The conditions were horrible for this kind of thing ... not much grip at all. I was hoping to build up my confidence in stopping distances using a few runs so that by my last (and fourth) run I would have been able to accelerate for much longer, but due to the clutch problem on my second run, I only did one proper run - and only ran half the length of the runway (if that). Bit disappointing, but i'll go back later in the year (and with a twin-plate rather than the clutch I have now).
The top speeds achieved on the day (NOT by me !) were 185mph by one car and 183mph by another. Pretty remarkable considering the lack of traction. I think these would have been higher had the runway been dry.
Daz
Daz,
Hi mate.
You'll find that whilst the wet makes a lot of difference to the acceleration times, (although less so for the 4wd cars you have), it does not affect top speed by as much. What happens is that you get to say 80mph a bit later than you would have otherwise done (perhaps by 50m) but its the acceleration above 100mph that determines the top speeds at Brunters and adding that 50m at the end would probably only add a couple of mph.
Most of my runs there have been in the 195-197mph range, but I have done five runs at 200mph or better (peak 202mph), when I removed the rear wing on a particularly cold day.
Guy
Hi mate.
You'll find that whilst the wet makes a lot of difference to the acceleration times, (although less so for the 4wd cars you have), it does not affect top speed by as much. What happens is that you get to say 80mph a bit later than you would have otherwise done (perhaps by 50m) but its the acceleration above 100mph that determines the top speeds at Brunters and adding that 50m at the end would probably only add a couple of mph.
Most of my runs there have been in the 195-197mph range, but I have done five runs at 200mph or better (peak 202mph), when I removed the rear wing on a particularly cold day.
Guy
DazGTR said:
That's a fair point regarding heavy launches - definitely saves putting additional stresses on the transmission.
Daz
Definitely, most of the faster cars at VMax are Porsches or Ferraris and they are not made for drag-racing, they have single-plate clutches and very expensive standard gearboxes (£10k+). On a typical VMax day I might do 10-20 top speed runs and I would not desire to do even one dumped-clutch style standing start.
Guy
GuyR said:
Definitely, most of the faster cars at VMax are Porsches or Ferraris and they are not made for drag-racing, they have single-plate clutches and very expensive standard gearboxes (£10k+). On a typical VMax day I might do 10-20 top speed runs and I would not desire to do even one dumped-clutch style standing start.
Guy
Mine is an uprated single plate too. Was fine after the first run. On the second run I held it for too long and overheated the clutch.
I was trying to save the transmission a bit by pre-loading everything (i.e. 5000 to 5500 RPM, held on handbrake with clutch on biting point). I held it for too long though (waiting for Don Palmer to do his thing and trying to get a good launch). If i'd just waited and not held everything for so long, my clutch probably would have been ok. Practise makes perfect I guess (and I was getting assistance on launch techniques).
Regarding the guys who were hitting 185mph ... if they had better traction, wouldn't they have been building speed that much quicker and therefore been able to achieve a higher top speed ? With it also being so wet they were having to allow much bigger braking distances as well. I think on a dry day they'd have seen 190 or more (neither car removed wings or anything). It was amazing how much everyone was spinning up ... including most of the GTR's - there really was little traction.
Glad to hear the GT2 is going well though ... I still remember going out in it when it was a stock car
Daz
Daz,
For sure they would have faster in the dry, but more due the greater driver confidence and better braking areas. Afterall I know Ronnie has managed a 204mph run at Brunters, so there no reason why many of the cars there would not have done high 190s or 200+ especially the Jun car (Hi Mick) and Tims Nur and Top Secret etc, as they certainly have the power. If it was very wet then I don't blame no-one for exceeding 180-ish, I've done 180+ in the rain there and it's quite nerve-racking.
As for the wheelspin argument, if you watch 1/4miles, people sometimes have bad launches and serious wheelspin, they get much worse ETs but the terminals are usually only slightly affected. The exception to this is if the wheelspin occurs for very very long distances.
Guy
For sure they would have faster in the dry, but more due the greater driver confidence and better braking areas. Afterall I know Ronnie has managed a 204mph run at Brunters, so there no reason why many of the cars there would not have done high 190s or 200+ especially the Jun car (Hi Mick) and Tims Nur and Top Secret etc, as they certainly have the power. If it was very wet then I don't blame no-one for exceeding 180-ish, I've done 180+ in the rain there and it's quite nerve-racking.
As for the wheelspin argument, if you watch 1/4miles, people sometimes have bad launches and serious wheelspin, they get much worse ETs but the terminals are usually only slightly affected. The exception to this is if the wheelspin occurs for very very long distances.
Guy
GuyR said:
Daz,
For sure they would have faster in the dry, but more due the greater driver confidence and better braking areas. Afterall I know Ronnie has managed a 204mph run at Brunters, so there no reason why many of the cars there would not have done high 190s or 200+ especially the Jun car (Hi Mick) and Tims Nur and Top Secret etc, as they certainly have the power. If it was very wet then I don't blame no-one for exceeding 180-ish, I've done 180+ in the rain there and it's quite nerve-racking.
As for the wheelspin argument, if you watch 1/4miles, people sometimes have bad launches and serious wheelspin, they get much worse ETs but the terminals are usually only slightly affected. The exception to this is if the wheelspin occurs for very very long distances.
Guy
The start makes no difference on the Topspeed at 1.5miles. The video below shows a 200+ run in the pouring rain.
From a very slow standing start the Data Log showed 0-150 in 25.7secs, the car is capable of 12.77s a loss of 13secs, 200 was still possible & braking was early to be able to stop. So dont worry about the start that just kills clutches.
http://video.google.com/videoplay?doc
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