UK RECORD 208.10 MPH IN A 928
08-16-2010, 12:42 AM
#61
Rennlist Member
I think only two 928's actually have, which I believe shared the same DEVEK mill.
There may be a few more that could do it, but haven't.
I'm thinking a couple in Wisconsin, Louie's GT, Mike Simard's big block, J.V.'s stroker, and maybe one of Tom F's rides, Mark Anderson's and Joe Fan's racers, and this probably assumes that all of them raised their redlines or ran
S4 gearing.
I think this puts your squeezed 928 as being the third fastest on record on the planet.
08-16-2010, 12:46 AM
#62
Rennlist Member
As an aside, it will be easy to find out where Brett did his run.
Just wait until the next issue of the Daily Mirror comes out and look for the story about the entire small seaside village on a deserted A-line road that suffered an inexplicable yet irrepressable laughing attack for four hours straight.
No way that little 4.7 could have been burning all of that NOS.
Just wait until the next issue of the Daily Mirror comes out and look for the story about the entire small seaside village on a deserted A-line road that suffered an inexplicable yet irrepressable laughing attack for four hours straight.
No way that little 4.7 could have been burning all of that NOS.
08-16-2010, 08:50 AM
#63
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^^
To be honest, the way Brett specifically draws attention to the fact that he's deleted the GPS heading, rather than just omitting that line entirely, is a bit of a strange decision (I am of the "don't ask, don't tell" school of thought).
Besides which, I'm not sure how knowing the current direction the car is pointing (GPS heading i.e. an angle not a plot?!) would tell you much anyway :S
Impressive achievement though, if a bit scary by the sounds of it!
To be honest, the way Brett specifically draws attention to the fact that he's deleted the GPS heading, rather than just omitting that line entirely, is a bit of a strange decision (I am of the "don't ask, don't tell" school of thought).
Besides which, I'm not sure how knowing the current direction the car is pointing (GPS heading i.e. an angle not a plot?!) would tell you much anyway :S
Impressive achievement though, if a bit scary by the sounds of it!
08-16-2010, 02:27 PM
#65
Rennlist Member
very impressive.
as was said, after 200mph, aero becomes pretty important for not taking flight.
i dont think you really need downforce, but what you need to do is reduce the air going under the car. however, a little bump and your high downforce car becomes a high lift wing. You all remember auberlen at Road Atlanta, right?
Very cool. too bad you didnt have any footage!
as was said, after 200mph, aero becomes pretty important for not taking flight.
i dont think you really need downforce, but what you need to do is reduce the air going under the car. however, a little bump and your high downforce car becomes a high lift wing. You all remember auberlen at Road Atlanta, right?
Very cool. too bad you didnt have any footage!
08-16-2010, 02:38 PM
#67
Nordschleife Master
Nice result.
You should definitely go back to the drag strip with your previous problems solved.
It's hard to make aerodynamic changes without testing, so wings, splitters, damns, baffles, and all will mostly have to be just tried out at high speed.
It would make sense to abort the run when the car becomes unstable, though, and make some tweaks.
You should definitely go back to the drag strip with your previous problems solved.
It would make sense to abort the run when the car becomes unstable, though, and make some tweaks.
08-16-2010, 02:57 PM
#68
Rennlist Member
thats what the car looks like? you are nuts! that looks like an upside down wing to the air. you are lucky you didnt get airborn. did you ever see that 250mph rx7 at bonneville?
what saved you is probably the lift you generated, wasnt as greater than the weight of your car, specially up front which is key. the issue isnt so much of 3500lbs of lift possible, because it isnt. I remember the speed GT tests of a vet before adjustement. it was clad with wings and splitters. downforce at the rear was near 150lbs and front was 40lbs of lift. speeds were near 120mph. after tuning, they got 300lbs of downforce in the rear and 150lbs of downforce in the front. take those numbers and the increase goes up with the square of speed (so double the speed, 4x the force) still pales to the overall weight of the car, BUT, as you all know, if the front starts to lift, that lifting force goes up. That greatly increases the lift, and at some point, you do get half the cars weight in lift and that wouldnt be good up front, as you take off at 200mph! this is why all the Bonneville cars are lowered, slammed and air dammed to avoid the chance of this happening. I wouldnt advice the rear wing tilt, as that only forces the rear down for traction, but will also make the front light, if you dont have splitters, hood vents, or dive planes up front.
what saved you is probably the lift you generated, wasnt as greater than the weight of your car, specially up front which is key. the issue isnt so much of 3500lbs of lift possible, because it isnt. I remember the speed GT tests of a vet before adjustement. it was clad with wings and splitters. downforce at the rear was near 150lbs and front was 40lbs of lift. speeds were near 120mph. after tuning, they got 300lbs of downforce in the rear and 150lbs of downforce in the front. take those numbers and the increase goes up with the square of speed (so double the speed, 4x the force) still pales to the overall weight of the car, BUT, as you all know, if the front starts to lift, that lifting force goes up. That greatly increases the lift, and at some point, you do get half the cars weight in lift and that wouldnt be good up front, as you take off at 200mph! this is why all the Bonneville cars are lowered, slammed and air dammed to avoid the chance of this happening. I wouldnt advice the rear wing tilt, as that only forces the rear down for traction, but will also make the front light, if you dont have splitters, hood vents, or dive planes up front.
08-16-2010, 03:01 PM
#69
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Nice result.
You should definitely go back to the drag strip with your previous problems solved.
It's hard to make aerodynamic changes without testing, so wings, splitters, damns, baffles, and all will mostly have to be just tried out at high speed.
It would make sense to abort the run when the car becomes unstable, though, and make some tweaks.
You should definitely go back to the drag strip with your previous problems solved.
It's hard to make aerodynamic changes without testing, so wings, splitters, damns, baffles, and all will mostly have to be just tried out at high speed.
It would make sense to abort the run when the car becomes unstable, though, and make some tweaks.
Hi
It was an unknown for me, as I "thought" the extreme Nitrous power would do everything lol...
I was totally wrong....
The stability of the car was perfect until around 185 (which says a LOT about how good a 928 is and how good the design was)
I could have happily driven all day at around 180 as an example....
Above 185 ish it started going "light" which is the only way I can describe it....
Then I was concentrating on the car "slowing" even though the Nitrous was still pushing the same amount of power...the only way I can describe it is it felt like the car was progressively getting a lot heavier....
Above 190 to 200 ish it was getting lighter and lighter but still pulling reasonably hard though slowing in acceleration...
I originally intended to try for 210 but I REALLY didn't like the way it felt over 200....
Once I got to 207 (which I knew would achieve my ambition of being faster than ANY production Porsche) I decided to back off, which I did...I lifted my foot completely which was probably a mistake as I suspect it unsettled the car.....it still increased to 208.10 but by then I was in trouble and knew it
The car although still moving forward was under almost no control, it seriously felt like I was sliding on oil or ice, so I did what we used to do in Top Fuel when using a Butterfly wheel after we lifted off and before we pulled the chutes.....tiny tiny movements to JUST try and keep straight, nothing more.....no braking, no nitrous adjustment...no nothing (a little praying maybe)
When the cars speed dropped to around 185, it sort of "landed" back on the surface and I had control again, although I let the speed drop to under 100 before I tried braking, and all was fine...finally.
Would I do it again.....yes, but ONLY once I have DRASTICALLY improved the aerodynamics, but at least I know that I will feel any improvement at around 185 to 190, I wouldn't top 200 again until it felt a lot better at 195 ish....and I ALSO wouldn't lift my foot straight off, I would EASE back on the power so as not to unsettle the car....which may or may not help
All the best Brett
08-16-2010, 04:19 PM
#71
Drifting
Do you believe that it happens in Mud?
Its not like you are smoking the tires. with the HP pushing forward and the resistence increasing and the weight coming off the tires, the tires slip momentaraly on and off. thats why the calculated RPM to tire size dose not match the actual RPM
08-16-2010, 05:06 PM
#72
Rennlist Member
Great accomplishment, and even more incredible that it was achieved on the wrong side of the road....
I drove in the UK for the first time last month and it was VERY disturbing for the first day or two. By day 3 I was sortof getting used to it.
Get video next time so we can all go along for the ride!
I drove in the UK for the first time last month and it was VERY disturbing for the first day or two. By day 3 I was sortof getting used to it.
Get video next time so we can all go along for the ride!
08-16-2010, 05:10 PM
#73
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Sorry to be a buzz killer, but with the lack of control you've described, if you did do this on a UK public road, or any public road for that matter, you should be ashamed of yourself.
There's a two mile straight at Bruntingthorpe you can use for a 70 or 80 quid an hour, find somewhere more appropriate to do the next run. You might not think you're putting anyone at risk except yourself, but you're talking 140mph closing speeds on your own side of the road and a very high risk of crossover.
By your own admission you were on the edge of control, just think about how you'd feel if you ended up killing someone for the sake of a cheap thrill.
There's a two mile straight at Bruntingthorpe you can use for a 70 or 80 quid an hour, find somewhere more appropriate to do the next run. You might not think you're putting anyone at risk except yourself, but you're talking 140mph closing speeds on your own side of the road and a very high risk of crossover.
By your own admission you were on the edge of control, just think about how you'd feel if you ended up killing someone for the sake of a cheap thrill.
08-16-2010, 05:15 PM
#74
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Sorry to be a buzz killer, but with the lack of control you've described, if you did do this on a UK public road, or any public road for that matter, you should be ashamed of yourself.
There's a two mile straight at Bruntingthorpe you can use for a 70 or 80 quid an hour, find somewhere more appropriate to do the next run. You might not think you're putting anyone at risk except yourself, but you're talking 140mph closing speeds on your own side of the road and a very high risk of crossover.
By your own admission you were on the edge of control, just think about how you'd feel if you ended up killing someone for the sake of a cheap thrill.
There's a two mile straight at Bruntingthorpe you can use for a 70 or 80 quid an hour, find somewhere more appropriate to do the next run. You might not think you're putting anyone at risk except yourself, but you're talking 140mph closing speeds on your own side of the road and a very high risk of crossover.
By your own admission you were on the edge of control, just think about how you'd feel if you ended up killing someone for the sake of a cheap thrill.
It wasn't on a public road.
And Bruntingthorpe is not long enough for what I was trying...
The ONLY person who could have been killed was myself and as an ex soldier that wasn't the first time I have been in that position....
All the best Brett
08-16-2010, 05:25 PM
#75
Rennlist Member
It sounds safe to say he used somewhere safe but doesn't want to disclose it for fear of losing the right to use it. Perhaps a closed airstrip or something. I don't think we should pry for the location. No one is dead, aero needs to be sorted before he'll do it again. Let's see what it can do when properly sorted.