Mikol's Bedford Autodrome Day 24/08/2012

[Ross]

Just thought I'd post up some super quick piccy's and stats from Mikes "taster" track day (£25, 20 mins on track jobbie) yesterday. He had a lot of fun, and I outfitted his car with a datalogger and HD video for me to play with.

Pics/vids to follow.

Fastest Lap: 2:14.57 sec
Max speed: 92.8mph
Max longitudinal G force (cornering): 1.03g
Max latitudinal G force (braking/accel): 0.63g / 0.37g

Mapping is from his fastest lap.
Overview:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/overview.jpg

Speed:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/speed.jpg

Longitudinal G:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/longaccel.jpg

Latitudinal G:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/lataccel.jpg

At a glance, we can already see some interesting data.
We've pretty even G side to side, so Mike's pushing evenly as hard left to right cornering and is on the limit of grip when cornering.
We can also see that we're miles away from maximum braking grip available, so Mike could brake a lot harder into some corners if needed.
We've also seeing a let-off of throttle 2/3rds of the way down some of the straights, so Mike's pussying out a little where he comes off throttle, then reapplies it, then brakes into the corner.

I'm already adding the video overlay, and I took some photos as a spectator and will add these a bit later today.

All in all, it was a fun few hours. Thanks Mike for letting me do this with your car :)

[Baz]

That looks brill! Loving the maps for speed and G through the corners and braking zones etc

[Mikol]

In my defense my brakes are warped and started to fade badly after a couple of laps, so I wasn't giving them as much of a pounding as maybe they could have taken.

Awesome data though Ross - looks very cool. Get the video up :D

[wadoryu]

Schweet what data logger is this?

[Ross]

Race Technology AX22:
http://www.race-technology.com/ax22_2_29.html

More to come in a bit :)

[wadoryu]

Thats utterly awesome.

[Dom]

Hehehe, only 92mph Mike? ;)

Brilliant Data Ross!

Mike, did you enjoy the Bedford Track?

[Mikol]

Ross if we had more time to set it up we could have taken the RPM feed from the engine, so you could really tell me off for my crappy shifts :D

I've got a RPM wire flapping around in the engine somewhere... TPS, MAP etc.

Haha, yeah Dom I think my clocks ticked around 98ish at one point but that just shows you how out they must really be!

It was a good track tbh, a good mix of fast and slow corners with some decent straights. It was only the SE track though - I think they have 4 configurations and a 'GT circuit' that goes around all of them! :D

[Ross]

yep would be nice to get some other inputs - brake switch and RPM are ideal too, although we can tell an awful lot with what we've got!

So - here's a couple of pics I took:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20128of10.jpg

Mike in chase mode:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20124of10.jpg

http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20125of10.jpg

Stuffing an MX5:
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20121of10.jpg

http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20122of10.jpg

http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/Medium%20Res/Mikol-BA-24-08-20129of10.jpg

I'll try and get the video up this afternoon, but I've got chores :(

[dannygti]

Very impressive..

Gives you an awful lot of data to show you where your going wrong

[Rogue_Shadow]

Awesome data logger :y:
Looks like a fun circuit too ... Almost too fun for general chat :fcuk:

[logic_guy]

Hehehe, only 92mph Mike? ;)

Brilliant Data Ross!

Mike, did you enjoy the Bedford Track?

92 Mph faster then you :p LooooL

[simmo]

This looks realyl good stuff Ross!

Cant wait to see the Video overlay!

[Viper]

How have those lines been recorded? Certainly doesn't look like a true GPS recording.

[Mikol]

I'm an ASW

http://i29.photobucket.com/albums/c300/AvP_Mich/XSProgress/IMG_7407_WhiteCars.jpg

[Ross]

The lines are gps, yes.

[Ross]

Love the tripod mike!

[blackie_2k5]

love this..wish my car was going and had some track time

wouldnt mind a bash of this to see the stats!!

[GolfJay]

Looks like an awesome bit of kit!

[Jay_]

That is freaking sweet!

[Brendan]

Disappointing I was at work otherwise I would've come down to watch!

[Viper]

The lines are gps, yes.

Interesting. The GPS lines look too 'perfect' if you know what I mean?

As an example here's a recent bike ride I recorded, if you zoom in you can see how it isn't perfectly straight.

http://app.strava.com/rides/19567406

[Barry123]

Interesting. The GPS lines look too 'perfect' if you know what I mean?

As an example here's a recent bike ride I recorded, if you zoom in you can see how it isn't perfectly straight.

http://app.strava.com/rides/19567406

Are you living in Thirsk faggyfeatures? Your iPhone doesn't have a high gps sampling rate. So it'll be shite in terms of positioning. Proper loggers check their position several times second and then average the positioning point to determine position more accurately.

Ross, this is purely picky, Longitudinal G is accel/decel. Lateral (never heard of it being called latitudinal before) is cornering G. Not trying to be a prat just pointing it out. Was Mikol using an Action Man doll parachute for braking? 0.67 g is seriously low for decel.

1 g cornering is interesting - what tyres was he running?
We did a similar set of datalogging for the formula student vehicle, the race tyres were ~2 g @ 12 psi.

Incidentally, is this all logged purely from GPS? I thought we had a discussion about this and you weren't a fan of GPS for accel/decel/speed/position?

Are you going to posting more stuff like this? I wanna see more stuff!

[Viper]

Are you living in Thirsk faggyfeatures? Your iPhone doesn't have a high gps sampling rate. So it'll be shite in terms of positioning. Proper loggers check their position several times second and then average the positioning point to determine position more accurately.

I still live at home but I work in Thirsk :y:

It wasn't recorded on my phone. It was on a GPS bike computer: http://corp.brytonsport.com/products/rider40?lang=en-US

[Mikol]

As above, was being a bit tentative on the brakes as they aren't at their best.

My bias is also in need of serious attention with 266's up front with hulking great pistons and poverty drums on the rear. Two possible reasons for a 'low' reading.

Tyres were Kumho KU31 on all corners.

[Barry123]

It wasn't recorded on my phone. It was on a GPS bike computer: http://corp.brytonsport.com/products/rider40?lang=en-US

Same thing in terms of sample rate - because it's battery powered (or at the very least, the battery is tiddly) it can't keep pinging the sats for a signal, otherwise it'd would out of juice after ten mins.

[Barry123]

As above, was being a bit tentative on the brakes as they aren't at their best.

My bias is also in need of serious attention with 266's up front with hulking great pistons and poverty drums on the rear. Two possible reasons for a 'low' reading.

Tyres were Kumho KU31 on all corners.

Ah fair doos.

Are the Kumho's newish? As that's pretty good cornering g from a road tyre, if I remember correctly the road going ferrari's were about 1.2, with a possibility of aerodynamics contributing to that. Apparently they get notably weaker with wear compared to other brands - I've never tried them though.

[Viper]

Surely the line would be straighter if it wasn't reading the whole time as it would be extrapolating in straight lines?

The more regular it reads then it would pick up more of the movements off a straight line.

I can't see how a GPS device could make it such a smooth line. Not getting at the lad's driving, just the way it's been recorded. Think if he had overtaken someone, it would show up as a wiggle on the GPS line.



Are the Kumho's newish?

I'm disappointed in you Adam.

I can also add that I love my Kumhos.

[Mikol]

Ah fair doos.

Are the Kumho's newish? As that's pretty good cornering g from a road tyre, if I remember correctly the road going ferrari's were about 1.2, with a possibility of aerodynamics contributing to that. Apparently they get notably weaker with wear compared to other brands - I've never tried them though.

They're about 2 years old or so. Around 2-3mm left on the poor things - I'm asking Santa for some new ones.

Think if he had overtaken someone, it would show up as a wiggle on the GPS line.

That's a mighty 'if'. :p

[blackie_2k5]

Surely the line would be straighter if it wasn't reading the whole time as it would be extrapolating in straight lines?

The more regular it reads then it would pick up more of the movements off a straight line.

I can't see how a GPS device could make it such a smooth line. Not getting at the lad's driving, just the way it's been recorded. Think if he had overtaken someone, it would show up as a wiggle on the GPS line.



I'm disappointed in you Adam.

I can also add that I love my Kumhos.

the gps does NUMEROUS tracks per second..so can correlate a nice line between the plots..

if not tracking as often you get a "jerky" lines as the distance travelled between plots is greater..so it just plots point to point..which will lead to more "straight" lines between plots

so instead of a nice clean smooth sweep from . . . . you get long lines at . . . . .

think off the dots being in diff areas, means jerky line :afro:


edit-- saxp wont let me space the dots far away :p :wall:

[Viper]

the gps does NUMEROUS tracks per second..so can correlate a nice line between the plots..

if not tracking as often you get a "jerky" lines as the distance travelled between plots is greater..so it just plots point to point..which will lead to more "straight" lines between plots

so instead of a nice clean smooth sweep from . . . . you get long lines at . . . . .

think off the dots being in diff areas, means jerky line :afro:


edit-- saxp wont let me space the dots far away :p :wall:

No. The more it speaks to the GPS then the more movement it will pick up. Therefore when he overtakes someone that slight deviation off the straight course will show and would be very noticeable on the image on the first page. Especially when you think that line should be layered from all his laps, it should have lots of deviations to it.

[Ross]

The gps is combined with 2 axis accelerometers also remember. Have a look at the spec:

http://www.race-technology.com/upload/AX22_Dsheet_050909.pdf

I stand by gps not being "that" accurate - the ax22 I used here is about as accurate as you can get commercially at 5hz. Combined with the accelerometers to give a 100hz refresh rate which IS accurate. :)

I've done two courses now on data analysis with race technology and the accuracy is one thing I've never questioned lol.

[Ross]

That line is one lap, not all, as said in the first post :)

[blackie_2k5]

yeah i aggree tom

im just referring my post against what adz posted about your bike ride and your reply to that,

in the datalogger instance for the track its just overlaying info about the drive against the map it has of the track via GPS :y: same as a sat nav would..it wont pick up the lane your in as its just over laying your route against its known map

[Viper]

Nope, I'm still not buying it.

I stand by my previous comments. A GPS line would shot all the small deviations in his lap, unless of course he was 100% perfect!

[Ross]

Nope, I'm still not buying it.

I stand by my previous comments. A GPS line would shot all the small deviations in his lap, unless of course he was 100% perfect!

Take it to Race Technology. ;)

Deviations like this?

Laps 2 to 5, first corner. It's this accurate exactly SO we can compare entry and exit points.
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/firstcorner-laps2-5.jpg

[Mikol]

Viper, I don't understand what you're looking for - the generated 'map' shows me cutting the apex on a couple of the bends... I'm not sure what discontinuities you're looking for -unless the car suddenly teleported itself a little bit to the left.

[greyjasper51]

Take it to Race Technology. ;)

Deviations like this?

Laps 2 to 5, first corner. It's this accurate exactly SO we can compare entry and exit points.
http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/firstcorner-laps2-5.jpg

As good as it is... It cant replace time in the seat... When your lapping within 0.01 each lap then go for it... Until that point... Get practicing... :-) just my opinion... I mean what do i know?

[Mikol]

Ross that's awesome - you can even see the line I had to take when I was passing the MX5 on the pit straight and had to dive down the inside.

[blackie_2k5]

i think it looks fair tbh..can see the laps over tracking

can see the lines clear...i cant imagine he'll have been zig zagging across the track

you take straight lines when going fast..whether you aim to or not

[Viper]

http://i851.photobucket.com/albums/ab74/rossdagley/Trackdays/Mikol%20-%2024-08-2012/firstcorner-laps2-5.jpg



Deviations like this?

Yeah exactly like that. That's what I was expecting to see :y:

[Ross]

Yeah exactly like that. That's what I was expecting to see :y:

Phew - we got there in the end :D

[Barry123]

Ross is the data stored in csv format or something excel-able?

[Ross]

Ross is the data stored in csv format or something excel-able?

No mate, it's specific to Race Technology.

[griff_106]

Very interesting data there Ross - if I ever got a track car or decided to take my current out on track I wouldn't say no to a bit of that tbh :y:

[Barry123]

booooooo

[Ross]

Quick low res version of the video Mike - I'll get something better together later :)

http://youtu.be/gPfORdhgLH4

[logic_guy]

How was the track Mike? Being a very flat airfield I can't imagine any visual cues that you're coming up to any particular bend or where you are on the track. I've seen a few cars hurtle it around here during my lunch break.

[sexy_gt]

i would love some of this gear for my toy

[Ross]

i would love some of this gear for my toy

Coming to Trax? If you're on track I can come up with something for you :)

[sexy_gt]

not going to trax, well not as planned mate. but thank you all the same for the offer.

[Dom]

Wheel bearing definitely says no in that video.

[Mikol]

LOL, Dom you should see/hear it now!

It's like stirring porridge... if the porridge was made of bolts.

All off the car now though, and the N/S seems alright. Hub flanges look a bit beat up though.