Wakefield speeds

[mazmad]

S3 133 and S10 144 Vmaxes.

[manga_blue]

OK, just refresh this page to see the updated chart.

[mazmad]

Thanks Phil. Cocked up my T5 shud be 88 hence the apparent stellar performance there, oops.

[Guran]

Love the graphs - lots of food for thought.
Manga's increased grip in the higher speed corners over Guran's - is it due to - wider tyres and better shocks? maybe the LSD ?
~ 3 secs between Manga's and Guran's time from a relatively slight overall speed increase, then another 3 secs to Mark's, even though a much greater increase in straight line speed and (probably) braking. The % increases don't correlate.

Vmax on the straight is a major factor in laptime at Wakefield Park. I compiled the following graph from data published in Motor magazine's "bang for your bucks" testing over several years. As a rough rule of thumb, every 4km/hr extra speed down the straight is worth about a second in laptime ... according to this data, which is all for unmodified cars on street tyres. Corner speed does come into it too, and I expect that Mark will find more time once he blows out those 18 month old cobwebs, and he learns how to deal with the boost in corners.

WP_Vmax_v_laptimes by Guran5, on Flickr

[Guran]

Here are the times and Vmax data from Phil's file for comparison.

laptime vs Vmax by Guran5, on Flickr

[NitroDann]

Really good data, does anyone know approximately what hp the mania black turbo car makes? I hear it has run in the 3's and it's always awfully quick.

Dann

[manga_blue]

Interesting, Bryan. You notice how we all run well below the general trend line. I suppose it's because we've all punted our cars for a while there, we have R-specs and also reflects the general handling advantage of MX5s over almost everything else out there.

I see that Tony and I are a bit above an MX5 trend (admittedly on an extremely limited sample) while you, Mark and Craig are all below. I think this could be partly the effect of weight. My car runs at about 1,130Kg race weight, Tony's would be about the same or worse but yours, Mark's and Craig's are all lighter cars. I can generate very high grip in sweepers but not in tight technical sections where weight transfer factors ruin agility. So my car is a total pig at SMP South. Weight also contributes to longer braking distances.

Craig, I've corrected your values, just refresh to view again. On R-specs I only have 1.5secs lead over Guran, which looks fair. I have 20% more power but probably 12% more weight. He's losing a bit of grip because of very low bounce frequencies on stock springs and inability to get power down early with that diff but making it up with edit: skilled (not desperate ) driving.

[Tony]

I see that Tony and I are a bit above an MX5 trend (admittedly on an extremely limited sample) while you, Mark and Craig are all below. I think this could be partly the effect of weight. My car runs at about 1,130Kg race weight, Tony's would be about the same or worse but yours, Mark's and Craig's are all lighter cars.

I agree Phil. Surprisingly, all our T10 speeds are relatively very similar, so Vmax down the straight should then simply be a power to weight issue. I'd reckon my fairly standard SE would be the heaviest car of all those mentioned (don't know what the weight is though) and in my case the driver would add another 110kg .

I have always been under the impression that T2, T8 and T10 were the most crucial corners in which to carry as much speed as possible as they preceded a straight. However looking at the graphs I can see that it's the technical section from T4 through to T8 (inclusive) that is letting me down; and for this I am blaming my smaller than average testicular circumference (combined with a general lack of ability)!

[Hellmun]

My Vmins are terrible compared to a 1:09:65 lap I have for when I was naturally aspirated....though that was on bald V70A's against the 3 year old brand new V70A's I was running last club day. Layering turbo Vs NA grip I'm seeing atleast 0.1 and up to 0.25G variances in lateral G in favour of N/A... though the wilwoods are hitting upto 1.25G under brakes and beating my N/A brake G's everywhere except fishhook which reverses 0.1 G. The extra power is putting me much further inward of the track so I have a less optimal braking line, which is in-turn is hurting fishhook speeds further.Overlaying the 1:09:65 and 1:07:28 turbo lap gives a theoretical best lap of 1:05:01. This gives you an idea of how much is in the turbo car yet with the right conditions and a lot of practice . Hopefully by the end of next year I'll be back on it again...but I'm definitely holding the car back again right now.

4th September 2012 Session 3 lap 2 .
S1 155.6kph
t2 93.06kph
S3 133.10kph
t3 127.2kph
t4 98.68kph
t5 99.72kph
S8 135.76kph
t8 70.39kph
S10 144.53kph
t10 66.55kph

[manga_blue]

I'd been hoping you'd come back with those figures, especially across the top. I remember you mentioned them last year and I still just can't comprehend how you did it.

It's an interesting indicator of how it can be much easier to handle N/A, isn't it?

[Guran]

Perfect example of how Hellmun's pre-turbo times were all about driver skill and fabulous set-up, as opposed to brute force. See the outlier on the graph.


laptime vs Vmax by Guran5, on Flickr