Flemke - Is this your McLaren? (Vol 5)
Discussion
thegreenhell said:
slinky said:
flemke said:
Gearing on F1 is pretty long. I think Vmax in 1st is 65, in 2nd is 90 or 95. It pulls well in 5th.
1. 66 mph
2. 98 mph
3. 125 mph
4. 154 mph
5. 185 mph
6. 231 mph
For the max speed run at Ehra, Mclaren removed the rev limiter for top gear to allow it to run to approx 7800 rpm.
I thought that the issue with the Palmer's 231 run at Nardo was that the tyre scrub was taking several mph off the car's accessible Vmax.
The road cars are artificially limited to 7,500. When I did my own "Vmax" run, I kept hitting the limited are 221 mph. This was on half-used tyres. Add on 1% for fresh tyres and you're at 223-224.
Doing the arithmetic, 8,000 is to 240 as 7,500 is to 225, knock off 1% for 3mm of tyre wear so you're down to 223, which implies that on the Ehra run the engine topped out at a bit over 7,900 rpm.
It seems to be difficult to find a definitive answer to this. Although the quoted gear ratios always seem to be the same, I have found two recurring but different sets of data for mph/1000rpm in each gear:
Dataset 1
Dataset 2
The worrying thing is that neither of these datasets is 100% consistent with the quoted gear ratios for the car, ie the unknown step down ratio calculates differently for each gear using these numbers.
I have also read an unverified quote attributed to Gordon Murray that the F1 is gearing limited to 221mph, which points more towards the second dataset, but then the revs seems too high for the 242 mph vmax run.
Dataset 1
Gear | mph/1000rpm | mph @ 7500rpm | rpm @ 242mph |
---|---|---|---|
1 | 8.7 | 65 | |
2 | 12.7 | 95 | |
3 | 16.7 | 125 | |
4 | 20 | 150 | |
5 | 24 | 180 | |
6 | 30 | 225 | 8072 |
Dataset 2
Gear | mph/1000rpm | mph @ 7500rpm | rpm @ 242mph |
---|---|---|---|
1 | 8.2 | 61 | |
2 | 12.1 | 91 | |
3 | 15.5 | 116 | |
4 | 19.1 | 143 | |
5 | 23.2 | 174 | |
6 | 29.4 | 221 | 8237 |
The worrying thing is that neither of these datasets is 100% consistent with the quoted gear ratios for the car, ie the unknown step down ratio calculates differently for each gear using these numbers.
I have also read an unverified quote attributed to Gordon Murray that the F1 is gearing limited to 221mph, which points more towards the second dataset, but then the revs seems too high for the 242 mph vmax run.
thegreenhell said:
I have also read an unverified quote attributed to Gordon Murray that the F1 is gearing limited to 221mph, which points more towards the second dataset, but then the revs seems too high for the 242 mph vmax run.
I don't know what Gordon did or did not say, but on well-used tyres I did a number of runs, north and south, up and down gradient, and every one came out at 221, so I am confident that that number was correct unless there was a systematic inaccuracy within the GPS unit. The tyres I was using had roughly 3mm less tread depth than when new.Also, we have the video evidence of the engine rpms during Andy Wallace's Ehra Leissien run, accompanied by both the McLaren GPS and the facility radar readings. All those things triangulate to a standard car's rev-limited Vmax of approx 224.
flemke said:
I don't know what Gordon did or did not say, but on well-used tyres I did a number of runs, north and south, up and down gradient, and every one came out at 221, so I am confident that that number was correct unless there was a systematic inaccuracy within the GPS unit. The tyres I was using had roughly 3mm less tread depth than when new.
Also, we have the video evidence of the engine rpms during Andy Wallace's Ehra Leissien run, accompanied by both the McLaren GPS and the facility radar readings. All those things triangulate to a standard car's rev-limited Vmax of approx 224.
I bet that was a bit, erm, hairy! Also, we have the video evidence of the engine rpms during Andy Wallace's Ehra Leissien run, accompanied by both the McLaren GPS and the facility radar readings. All those things triangulate to a standard car's rev-limited Vmax of approx 224.
So when you hit 221, was it still pulling reasonably strong and just ran into the rpm limiter (to suggest it'd hit 240) or did it just run out of puff?
E65Ross said:
flemke said:
I don't know what Gordon did or did not say, but on well-used tyres I did a number of runs, north and south, up and down gradient, and every one came out at 221, so I am confident that that number was correct unless there was a systematic inaccuracy within the GPS unit. The tyres I was using had roughly 3mm less tread depth than when new.
Also, we have the video evidence of the engine rpms during Andy Wallace's Ehra Leissien run, accompanied by both the McLaren GPS and the facility radar readings. All those things triangulate to a standard car's rev-limited Vmax of approx 224.
I bet that was a bit, erm, hairy! Also, we have the video evidence of the engine rpms during Andy Wallace's Ehra Leissien run, accompanied by both the McLaren GPS and the facility radar readings. All those things triangulate to a standard car's rev-limited Vmax of approx 224.
So when you hit 221, was it still pulling reasonably strong and just ran into the rpm limiter (to suggest it'd hit 240) or did it just run out of puff?
Chicane-UK said:
I think I read something a few pages back about how a P1 had been painted in a TVR style flip paint, and how it was deemed a 'poor choice' by flemke. At the time I read that and saw the small picture and disagreed... I thought it looked great. Until, that is, these pictures emerged on another forum. I guess the wheels don't help matters but... wow... it really makes the car look *completely* wrong in my humble opinion!
http://imgur.com/a/c9DW3
That doesn't look good at all. http://imgur.com/a/c9DW3
Edited by Chicane-UK on Wednesday 26th November 09:17
E65Ross said:
Thanks Flemke.
You rate the F1 as your favourite (or right up there!) ever drivers car as an experience etc.... What's your next favourite?
Probably either NSX or LCC Rocket.You rate the F1 as your favourite (or right up there!) ever drivers car as an experience etc.... What's your next favourite?
ETA: Almost forgot, SLS Black Series is right up there.
Edited by flemke on Wednesday 26th November 22:44
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