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Liam_ |
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Liam_ World Chat Champion
Joined: 26 Jul 2005 Karma :
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Posted: 22:51 - 10 Dec 2011 Post subject: Me throwing £14k down the track |
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I did my first track day on the BMW back in august. I had been looking forward to it even before I bought the bike, so when i got to the circuit and the weather was one of the better days I was pretty excited.
In the past I've always used proper fast road/track tyres but seeing as the tyres I had on the bike had about 1000miles on them it seemed a bit of a waste to chuck them so I decided to use em.
I hadn't been on track for nearly 2 years so i started off slowly getting familiar with the track again and learning any new feature like the kerbs on the chicanes and just as well, had i took my old line through their i would have went to the moon.
After a few laps i decided to up the pace a little but for some reason i just could get up to speed, I couldn't hold a line through the corners, bike felt nervous and the long left down to the hairpin the rear tyre was squirming all over the place to the point the bike was almost power-sliding, then into the hairpin i was getting some strange vibes through the bars almost like the tarmac was rough. I knew from memory that a lot of bikes go down on that corner and dig into the tarmac so i put it down to that.
After a few more laps i returned to the pits to gather my thoughts as to why i was struggling.
Tyre pressures?! i got a hold of a tyre pressure gauge and to my horror the pressure shown was 50PSI!! both front and rear. Holy shit i thought but it was soo high i thought the gauge was faulty, so I only knocked 10psi out of the tyres. If the gauge was right then that was still too high as i should have been running 30 at the front and 28 on the rear.
Back out i went and the bike felt a little better but still not up to a pace that i was used to on previous bikes. I persevered and kept trying and yet again the issues i was having before came back.
https://urbanracing.net/bike/bmw/5.jpg
https://urbanracing.net/bike/bmw/6.jpg
https://urbanracing.net/bike/bmw/7.jpg
https://urbanracing.net/bike/bmw/8.jpg
Thinking it was in my head and just being a bit rusty I kept going and then
Everything as normal
https://urbanracing.net/bike/bmw/1.jpg
Hmmm, the vibration in the bars again.
https://urbanracing.net/bike/bmw/2.jpg
Oh its gone all light.
https://urbanracing.net/bike/bmw/3.jpg
I can still save it.... errm no
https://urbanracing.net/bike/bmw/4.jpg
That rough feeling i mentioned through the bars was me pushing the front end too hard and it was sliding, on that lap i was way beyond what the tyre could give. also coupled with the fact they were road tyres and the pressures would have gone up again once the heat got into the tyres, no doubt back up to 50psi.
The damage:
https://www.urbanracing.net/bike/bmw/9.jpg
https://www.urbanracing.net/bike/bmw/10.jpg
https://www.urbanracing.net/bike/bmw/11.jpg
https://www.urbanracing.net/bike/bmw/12.jpg
The crash protectors did there job by limiting what hit the deck so I got off lightly. Mirror, indicator, rear brake lever, bar end, a few scratches on the bodywork and the exhaust which is made from Titanium and Carbon Fibre i was told the spark trail from the bike was impressive
I've replaced everything except the exhaust, i'll leave that till over the xmas period when the bike will be wrapped up for the winter until I decide weather to replace like for like or go down the route of a full system. I'm also going to get the suspension setup.
Lessons learned:
Don't use road tyres if you want to set a lap record.
Check the tyre pressures before you go out on track. ____________________ I got a dig bick. You this read wrong. You read that wrong too.
Yamaha R1 2016
Last edited by Liam_ on 22:54 - 10 Dec 2011; edited 1 time in total |
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VTRkemshell10... |
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VTRkemshell10... Spanner Monkey
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shereen |
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shereen World Chat Champion
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The Artist |
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The Artist Super Spammer
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waffles |
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waffles World Chat Champion
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Liam_ |
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Liam_ World Chat Champion
Joined: 26 Jul 2005 Karma :
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waffles |
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waffles World Chat Champion
Joined: 04 Oct 2009 Karma :
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Posted: 23:16 - 10 Dec 2011 Post subject: |
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Just goes to show that crash bungs can be a very worthwhile investment ____________________ Theory test - 19/8/09, CBT - 11/10/09, MOD 1 - 16/8/10, MOD 2 - 27/10/10
Past rides Yamaha XT125X, Triumph TT600, Honda XR250
Current rides Suzuki GSXR 600, Honda MSX125 |
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nowhere.elysium |
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nowhere.elysium The Pork Lord
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JoeDougieDoug... |
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JoeDougieDoug... World Chat Champion
Joined: 25 Oct 2011 Karma :
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Posted: 01:15 - 11 Dec 2011 Post subject: |
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Man thats a sweet bike Good pics too. good job. ____________________ CBT Passed - 22 / 10 / 11 >> Theory Passed - 16 / 02 / 2012 >> Mod 1 Passed - 07 / 03 / 2012 >> Mod 2 Passed - 18 / 05 / 2012. |
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Hetzer |
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Hetzer Super Spammer
Joined: 19 Feb 2007 Karma :
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Posted: 01:23 - 11 Dec 2011 Post subject: |
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How the fuck did you have 50psi in your tyres?! ____________________ "There's the horizon! Ride hard, ride fast and cut down all who stand in your way!" |
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Liam_ |
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Liam_ World Chat Champion
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Liam_ |
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Liam_ World Chat Champion
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Hetzer |
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Hetzer Super Spammer
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Liam_ |
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Liam_ World Chat Champion
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mattress |
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mattress Scooby Slapper
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evoboy |
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evoboy World Chat Champion
Joined: 20 Aug 2009 Karma :
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Posted: 13:53 - 11 Dec 2011 Post subject: |
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Road tyres are fine on track with the correct pressures.
Obviously not as good as dedicated track tyres.
Id say it was more a combo of suspension setup and too high tyre pressures. ____________________ Suzuki GT250 x7------- Fazer 600------CB250RS------Aprilia Rally 70----- Bandit 600
APT Motorcycles |
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TheDonUK |
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TheDonUK World Chat Champion
Joined: 20 Feb 2006 Karma :
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Posted: 15:10 - 11 Dec 2011 Post subject: |
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From the thread title i expected carnage, i think you got away lightly with the dmg done. Unlucky.
14k for a bike though?? Bloooddy hell
A Blokle over in Twickernam is great at setting up suspensions, look him up, hes a nice guy.
httP://briannicholson.wordpress.com/ ____________________ [Current Bikes - GSXR-750 K5 & C90-97 ] [Previous Bikes: Runner 125, YBR 125, GS500, Bandit 600, Hornet 600, ZX6R-99, C90-99, R1-99, XT600E-04, GSXR-750 K4, CRF250L '16] |
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D O G |
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D O G World Chat Champion
Joined: 18 Dec 2006 Karma :
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Posted: 23:04 - 11 Dec 2011 Post subject: |
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Liam_ |
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Liam_ World Chat Champion
Joined: 26 Jul 2005 Karma :
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Posted: 00:24 - 12 Dec 2011 Post subject: |
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D O G wrote: | All tyres heat up substantially on track, with corresponding hike in pressure.
I'm very suprised that you didn't know that having been on track many times in the past (from what I can gather from your post).
I've been on track with touring spec tyres on and not had a problem, there really is little difference in absolute grip - it's just not exceeding the total grip level which is the key!
Were you on or off the throttle when the front washed out? |
I did know that but in my excitement to get back out on track after 2 years I didn't check and reduce my initial tyre pressures, also I had never felt vibes through the front bars before so didn't know that was the tell tale sign of "pushing the front"
I have used Pirelli Diablo Rosso's and Pilot Road 2's on the same track and had no issues so I assumed the Conti Sport Attacks (aka Heart Attacks) would have been just as good.
Throttle was neutral at the time, not decelerating nor accelerating. ____________________ I got a dig bick. You this read wrong. You read that wrong too.
Yamaha R1 2016 |
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Redoko |
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Redoko World Chat Champion
Joined: 04 Nov 2009 Karma :
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Posted: 01:49 - 12 Dec 2011 Post subject: |
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Considering, the damage isn't that bad at all. ____________________ "Let's face it, this is not the worst thing you've caught me doing."
Sudika Sportsman SK50QT > Gilera DNA50 > Honda CBR125 RW7 > Kawasaki Zephyr750 > Suzuki GSXR600 > Honda Hornet CB600F '51 |
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RONSTER |
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RONSTER Crazy Courier
Joined: 08 May 2006 Karma :
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bEN_ |
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bEN_ World Chat Champion
Joined: 17 Dec 2005 Karma :
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Posted: 20:38 - 12 Dec 2011 Post subject: |
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That does look like an odd one, did the front slide quite abit initially before it let go ? in the picture of it giving up it looks like you'd have been just starting to roll the throttle on ____________________ 2010 Ducati 848 Dark
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swiftb |
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swiftb World Chat Champion
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Posted: 20:43 - 12 Dec 2011 Post subject: |
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Devastating to drop it mate - but if you can afford to track a 14k bike you can afford to fix it Lets be honest - it might be a bit annoying now but in a few years youve got some awesome pictures to look back on!! |
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Deano |
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Deano World Chat Champion
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Liam_ |
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Liam_ World Chat Champion
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Old Thread Alert!
The last post was made 12 years, 133 days ago. Instead of replying here, would creating a new thread be more useful? |
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