Ken at Nine Excellence lied to me...
Discussion
APOLO1 said:
TB993tt said:
I don't know what we're looking at here, is it the gauge on the right, what is it showing ? full coupling until what speed ?
no just look at the speedo, do you see any tail off from 165, this is when the front motor lets go..it still pulls like a train.....anonymous said:
[redacted]
Twin turbo UGR car.I raced a late run out model SL and left it for dead. I was amazed there was such a difference but I suppose I should not have been as its "only" running 570bhp. Beauty of car though but looked very slow on the drag strip as did I to be fair compared to many of the cars there. there's alway a bigger fish in the water lol!
IMIA said:
I think theres' something wrong with the VMAX traps. There's no way the 918 and Hs were 200 and 204 mph just no way. I was doing VBOX verified 201.7mph and the grey H had the legs on me. I understand I may have been going quicker chasing him down but honestly that thing was at least doing 205 mph + IMO and the 918 even quicker
Nah, The 918 was doing 203/204, you can see clearly on the video above he goes through the beams at 210mph speedo for which 203/4 GPS sounds right.2 mph is a big difference when you are travelling at 90 metres per second, a lot more power needed to gain those extra mph at those speeds and levels of drag. and don't forget your 997 turbo has very low drag especially in comparison to a 918 or a H. (If I get time I will crunch the numbers to illustrate.)
Then of course we have the 20 to 37 mph tail wind on the day, this makes a big difference as H will tell you and shouldn't be ignored, We used to refer to it as "the hand of god" after a previous PHer gained an incredible 6mph on one run.
IMIA said:
I think theres' something wrong with the VMAX traps. There's no way the 918 and Hs were 200 and 204 mph just no way. I was doing VBOX verified 201.7mph and the grey H had the legs on me. I understand I may have been going quicker chasing him down but honestly that thing was at least doing 205 mph + IMO and the 918 even quicker
I did think that, I am taking a vbox to the next one....I saw 215 speedo..APOLO1 said:
IMIA said:
I think theres' something wrong with the VMAX traps. There's no way the 918 and Hs were 200 and 204 mph just no way. I was doing VBOX verified 201.7mph and the grey H had the legs on me. I understand I may have been going quicker chasing him down but honestly that thing was at least doing 205 mph + IMO and the 918 even quicker
I did think that, I am taking a vbox to the next one....I saw 215 speedo..TB993tt said:
Nah, The 918 was doing 203/204, you can see clearly on the video above he goes through the beams at 210mph speedo for which 203/4 GPS sounds right.
2 mph is a big difference when you are travelling at 90 metres per second, a lot more power needed to gain those extra mph at those speeds and levels of drag. and don't forget your 997 turbo has very low drag especially in comparison to a 918 or a H. (If I get time I will crunch the numbers to illustrate.)
Then of course we have the 20 to 37 mph tail wind on the day, this makes a big difference as H will tell you and shouldn't be ignored, We used to refer to it as "the hand of god" after a previous PHer gained an incredible 6mph on one run.
I did have the wing in the max DF mode, ie Hot Lap, it unwinds quite a bit of angle, when dialled back to race....2 mph is a big difference when you are travelling at 90 metres per second, a lot more power needed to gain those extra mph at those speeds and levels of drag. and don't forget your 997 turbo has very low drag especially in comparison to a 918 or a H. (If I get time I will crunch the numbers to illustrate.)
Then of course we have the 20 to 37 mph tail wind on the day, this makes a big difference as H will tell you and shouldn't be ignored, We used to refer to it as "the hand of god" after a previous PHer gained an incredible 6mph on one run.
TB993tt said:
IMIA said:
I think theres' something wrong with the VMAX traps. There's no way the 918 and Hs were 200 and 204 mph just no way. I was doing VBOX verified 201.7mph and the grey H had the legs on me. I understand I may have been going quicker chasing him down but honestly that thing was at least doing 205 mph + IMO and the 918 even quicker
Nah, The 918 was doing 203/204, you can see clearly on the video above he goes through the beams at 210mph speedo for which 203/4 GPS sounds right.2 mph is a big difference when you are travelling at 90 metres per second, a lot more power needed to gain those extra mph at those speeds and levels of drag. and don't forget your 997 turbo has very low drag especially in comparison to a 918 or a H. (If I get time I will crunch the numbers to illustrate.)
Then of course we have the 20 to 37 mph tail wind on the day, this makes a big difference as H will tell you and shouldn't be ignored, We used to refer to it as "the hand of god" after a previous PHer gained an incredible 6mph on one run.
Watch Apollo's video, it is clear he is going through the beams at 210mph speedo and he is keeping his foot down, I believe him that he saw 215 speedo but that is not really what we are talking about, we are talking about comparable speeds to other cars on the day ie speed through the beams aren;'t we or were your (IMI) speeds also further on from the beams ?
You guys need to understand it is about power and aerodynamics, it always has been and we've been doing this for years
I crunched some numbers from formulae available here
http://www.reverie.ltd.uk/calculate.php
This allows you to calculate how much power is needed to overcome drag so therefore it can tell you how much power you have for acceleration at a given speed.
The 997 turbo is a slippy beast with CdA 0.59. it needs 350hp to achieve 201mph so at 201mph IM's car has about 300hp available for acceleration (assuming he has 650hp)
The 918s CdA is not published but Apollo says he was on full downforce mode.... If I use the Carrera GT CdA of 0.71 it takes 426hp for that car to maintain 201mph so if the 918 was at its 758hp (sans electric motor) that gives 332hp available for acceleration .
This might all seem a bit wrong but you have to remember this is non linear acceleration, the 918 will have a LOT more power lower down the drag curve (than the 997 turbo) and it will also have its full 875hp so at 150mph (using the same formula) the 997 has 506hp available after drag and the 918 (using CGT CdA) has 700hp.....
You guys need to understand it is about power and aerodynamics, it always has been and we've been doing this for years
I crunched some numbers from formulae available here
http://www.reverie.ltd.uk/calculate.php
This allows you to calculate how much power is needed to overcome drag so therefore it can tell you how much power you have for acceleration at a given speed.
The 997 turbo is a slippy beast with CdA 0.59. it needs 350hp to achieve 201mph so at 201mph IM's car has about 300hp available for acceleration (assuming he has 650hp)
The 918s CdA is not published but Apollo says he was on full downforce mode.... If I use the Carrera GT CdA of 0.71 it takes 426hp for that car to maintain 201mph so if the 918 was at its 758hp (sans electric motor) that gives 332hp available for acceleration .
This might all seem a bit wrong but you have to remember this is non linear acceleration, the 918 will have a LOT more power lower down the drag curve (than the 997 turbo) and it will also have its full 875hp so at 150mph (using the same formula) the 997 has 506hp available after drag and the 918 (using CGT CdA) has 700hp.....
As an aside I not once look at the speedo lol. Kept my eyes firmly on track as I didn't want to kill both me and my guest Chris! It was properly wet most of the day and whilst we had lots of run off area it took me three runs just to have the guts to brake at the brake board! Having said that and seen a few vids of other drivers they were braking far earlier than us in the end.
IMIA said:
Mine was both on VBOX and just as we crossed the beams as far as I'm aware. Is there a discrepancy between VBOX and beams? We were consistently doing over 200 mph on VBOX all day long.
IM, you need to watch Apollo's video to see what I'm on about - the maniac
keeps his foot down for a couple of seconds AFTER the beams, I was just asking if you were doing the same ?TB993tt said:
IM, you need to watch Apollo's video to see what I'm on about - the maniac keeps his foot down for a couple of seconds AFTER the beams, I was just asking if you were doing the same ?
Lol, I actually thought the beams were further down..that's why I kept it planted....going so fast I did not notice.... keeps his foot down for a couple of seconds AFTER the beams, I was just asking if you were doing the same ?TB993tt said:
IMIA said:
Mine was both on VBOX and just as we crossed the beams as far as I'm aware. Is there a discrepancy between VBOX and beams? We were consistently doing over 200 mph on VBOX all day long.
IM, you need to watch Apollo's video to see what I'm on about - the maniac keeps his foot down for a couple of seconds AFTER the beams, I was just asking if you were doing the same ?
I braked well after the brake now boards :-)
Out of interest i was speaking to some of the guys who still compete at TOTB which i used to run. The fastest car there over the standing 1kilometer is Andy Forrest in his Subaru imprezza at 211mph :-)
Hes in the 7s 1/4m now at 170+mph and also won the handling circuit. Can we get him an invite to your next event lol :-)
Out of interest i was speaking to some of the guys who still compete at TOTB which i used to run. The fastest car there over the standing 1kilometer is Andy Forrest in his Subaru imprezza at 211mph :-)
Hes in the 7s 1/4m now at 170+mph and also won the handling circuit. Can we get him an invite to your next event lol :-)
Elvington is about 2 useable miles and lots of cars blew up there over the years using a 1.7m top speed run. Ive seen bikes doing 250mph there in a standing mile, no fear nutters.the welsh event is interesting as i thought i knew all the long runway venues in the uk but I've been out of it for a long time tbh. The top speed long runs just show up the slightest weakness in an engine or map, very hard on the cars.
One thing that really impressed me was how your car took the repeated runs without breaking sweat. We must have done 6 over 200mph and quite a few back to back without any sign of stress or boiling up. Nicely modified and very well set up as a package.
One thing that really impressed me was how your car took the repeated runs without breaking sweat. We must have done 6 over 200mph and quite a few back to back without any sign of stress or boiling up. Nicely modified and very well set up as a package.
For Wales I'd defo get my car serviced and everything checked out by 9e before running. Having said that famous last words but pretty confident we should be okay as we aren't running lots of boost like other tuners. Only 1.3 bar in attack mode. I think its an air force base or something and we've already been warned if they have an exercise on configuration may change much to the relief of the GTRs lol
IMIA said:
He just needs to get in touch with Joss (wasn't she lovely!?) or Craig. There's an event in may at Brunters I think and another in July at 5 mile Welsh runway. I think a few more engines may let go in Wales.
Can't be a runway can it, planes don't need 5 miles to take off - isn't it a beach ? If so, you really want to run your P&J on sand and near salty water ?Gassing Station | Porsche General | Top of Page | What's New | My Stuff