I'd say Leigh's car is quite a bit heavier in the front than your 1600 Dough hence braking and exit speed. Your balls can pulsate a bit longer than Leigh's

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1928 Model A CC Pickup

yep i definitely have some time to make up in braking and corner speed, just knowing the capabilities of my brakes and being confident that they'll work is a big one.

There were some great tussles between doug, myself and the porkers and that mirage it really was an awesome day!

i've got to work out my oil catch can/breather issues as its starting to piss me off having to have to empty my badly designed catch can all the time! makes a mess of the engine bay too

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LAGWAGON gracefully retired... LAG 510 - the next generation

Leigh definitely needs to stand on the brakes (testosterone injections into each nut daily between now and next event will help). Even with extra weight, he should be able to pull up harder with 4 wheel discs and R32 fronts compared to my 240K disc/240Z drum combo. You can see how much ground I make up into Honda - I've taken to approach of leave it to the last minute then stand on them, worst case you run into a gravel trap (or skid straight off at MG across grass and just missed tyre wall as I did on my last run of the day!) I did suffer from the red haze when I outbraked the Mirage into Honda, sweating bullets that I would lock up and spear across the front of him as he turned in. Got away with it!

I'm having trouble editting the next 3 vids for some reason to get them under 10 mins for YouTube. The last run I have on vid has a fair bit of me chasing Leigh and Leigh's James Bond style oil spray onto exhaust trying to either get me to skid off or lose him in the smoke screen .

I'll keep playing with my vid editting. Worst case I can burn to DVD.

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

Sounds like you had fun guys hopefully il make it to the next one the island still scares me a bit but .If you having trouble geting oil trade price leigh let me know and il order some through work they use mobil 1 on all the hsv's

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120Y 4DOOR SEDAN SR20DE WITH ITB'S

http://datsun1200.com/modules/newbb/vie ... post494892

Performance Box raw lap time data below. Ignore the big numbers, they include time spent in the pits at the end of each session. Interestingly in our second last run of the day when I was chasing Leigh, Leigh strung together 4 laps between 1:59.3 and 1:59.9 and I did 5 laps between 1:58.6 and 1:59.1. I reckon we should get a V8 Supercar drive with that sort of consistency!!

Date 15/08/2009
DOUG LEIGH
Lap Lap Time Lap Lap Time
2 2'04.0" 2 2'07.7"
3 2'02.0" 3 2'01.8"
4 2'01.9" 4 2'02.7"
5 1'58.7" 5 2'01.6"
6 2'06.8" 6 1'59.4"
7 67'32.0" 7 50'19.5"
8 2'03.9" 8 2'23.5"
9 1'59.3" 9 2'08.8"
10 1'59.4" 10 2'05.0"
11 1'59.0" 11 2'03.3"
12 80'15.0" 12 2'10.4"
13 2'00.5" 13 2'38.7"
14 1'58.8" 14 4'08.9"
15 1'58.0" 15 87'24.9"
16 1'59.3" 16 2'21.7"
17 2'00.9" 17 2'01.1"
18 2'01.3" 18 1'59.1"
19 89'54.6" 19 1'57.9"
20 2'02.4" 20 1'59.0"
21 2'01.7" 21 1'59.1"
22 2'01.6" 22 1'58.6"
23 2'02.6" 23 87'34.9"
24 1'58.7" 24 2'22.5"
25 1'59.1" 25 2'01.9"
26 41'26.1" 26 2'02.5"
27 1'59.1" 27 1'59.9"
28 1'58.6" 28 1'59.6"
29 1'58.6" 29 1'59.3"
30 1'58.7" 30 1'59.9"
31 1'58.8" 31 19'59.9"
32 41'46.3" 32 2'18.0"
33 1'58.4" 33 2'00.3"
34 1'57.9" 34 1'58.7"
35 1'57.8" 35 1'59.4"
36 2'31.1"

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

You can see towards the end of the day you kept getting quicker and quicker - nice work! i seemed to get slower, then pulled out a 58 and then slower again. unfortunately i think im up for some new rear tyres soon

interested in the different braking data and speeds at different points too

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LAGWAGON gracefully retired... LAG 510 - the next generation

Lap trace below of our best laps for the day (Leigh blue, me red). For some reason, it has taken the start point around at Siberia and the actual lap times taken from that point are 1:57.70 for me and 1:57.59 for Leigh (damn!) Obviously times differ depending where the start/finish line is assumed.

My analysis of the chart:

- Leigh's top speed 224 km/h (sh*t hot!), mine 206 km/h. (211 was my best for the day, 224 was Leigh's best) You can see that in the video as Leigh easily pulls away. Problem is I was happy with my times but seeing this makes me want to go faster! Turbocharged rotary.....?
- Hay shed me 166 accelerating flat out, Leigh 155 and on and off the power
- Leigh faster over Lukey but I accelerate out of Lukey before braking into MG so I peak at 140, Leigh 129
- MG corner speed both 58
- acceleration out of MG almost identical (slope of graph)
- very similar until we hit main straight where Leigh accelerates harder to higher top speed
- I push harder into trun 1 going around there at 170, Leigh 155 and I carry that all the way to Southern Loop
- similar through the loop (minimum speed about 105)
- Leigh accelerates harder out of the loop but backs off for the kink (169) whereas I stay flat and get to 180
- I brake later and harder into Honda, both go through at about 70
- Leigh accelerates harder into Siberia and brakes earlier, corner speed about the same

So the summary is - Leigh's car accelerates considerably harder than the chicken cooker (as you would expect for 200 vs 260 rwhp), cars seem able to carry similar corner speed. I am making up time by pushing harder or holding flat through Hay Shed, turn 1 and the kink before Honda (the 3 really scary bits!) I also make up time by braking later and harder into MG and Honda.

My gut feel is Leigh has a couple of seconds in reserve, just needs to build confidence in braking performance and maybe some new tyres to allow him to go flat through the fast bits. Saturday was the first time I was able to go flat through these bits which I put down mostly to new tyres and a bit to brave pills.

Enjoy!

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

Couple more interesting facts:

Lateral G forces:

Turn 1 Leigh 1.4G, Doug 1.26G
Siberia 1.33G vs 1.26G
Hayshed both 1G sustained through corner
Lukey 1G vs 1.22G

Pretty impressive to be pulling 1.3 - 1.4G in an old Datto!

Longitudinal G (acceleration) - Leigh 0.69G, Doug 0.61G

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

that is awesome! what a great way to compare! i definately could go deeper into corners but i did feel that through corners it was a balance due to it squirming around. Interested to see if the footage looks like that or if its in my nuts.

any luck uploading the vid?

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LAGWAGON gracefully retired... LAG 510 - the next generation

so i have higher corner g forces in some corners but am slower? or am i reading that wrong?

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LAGWAGON gracefully retired... LAG 510 - the next generation

Yeah, G force is probably a bit odd. The figures I gave are peaks and very short duration, just a spike on the graph so not true sustained G force through the corner. It does not make a lot of sense to be slower with higher G force unless you took a sharper route through a corner.

I have downloaded vid to hard drive but editting software sh*t itself and I can't crop the file to under 10m to load on YouTube.

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

man that's some high tech analysis. I am also interested in the G-force thing. You say it may be just some spikes in the data but I would have thought that the limit of adhesion would basically smooth the curve to give you a pretty accurate figure. Like you said, it could be that leigh is driving a slightly tighter line and actually has more grip, or what my guess would be is that there's a bit of discrepency in your sensors. I it seems unlikely that Leigh drives such a bad line that he can drive through a corner 10% slower yet pull 10% more G's.

I reckon the difference at the kink after the southern loop as well as the hayshed is the torque delivery of the turbo. You get such a punch from the turbo mid corner that i reckon it takes much more driver skill to regulate as opposed to an N/A motor. Like you said though, doug, with more practise leigh probably should be a few seconds quicker than you.

Here's Leigh's lateral G graph.....as you can see, bit hard to make much sense of as it is very spiky. The maximum and minimum are around 1G with spikes to 1.2 - 1.4.

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

More video here including footage of Leigh's car from behind.

http://ozdat.com/forum/viewtopic.php?f= ... &start=165

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Race car 13B 1600 - since SOLD!
'13 M135i, Quaife LSD, tuned (380 hp)
'15 X5 xDrive 30d tow car
'02 Porsche 996 GT2 (600hp/480rw hp)

Hey Doug, Leigh,

Looks like it was a great day down at P.I.!

That lat acc trace doesnt look *too* noisy - raw lateral acc data is generally relatively noisy without filtering. ~1-1.1G cornering capability is pretty bloody good, if you were measuring 1.3-1.4G sustained accelerations it would be suspicious. Does the Performance Box measure lateral with an internal accelerometer sensor, or calculate it from GPS data? The jump in data at approx the 2800m mark looks like that resulting from GPS glitch.

What sort of decelerations did you guys generate, as an indication of your braking capability?

Also, can the Performance Box data be exported to an external format eg excel, as I wouldnt mind having a look at analysing the comparison data??