Tmp thurs may 2

YellowDuck said:
50 lbs is not *that* much. If the spring rate in the forks is 0.85 kg / mm x 2 springs = 1.7 kg /mm. 50 lbs is 23 kg, but only about 40% of it is on the front in a normal riding position, so that's 23 kg x 0.4 / 1.7 mm / kg = 5.4 mm extra rider sag.

50 lbs is about 8% of the combined total bike + rider weight, so should add about 8% to positive suspension travel, all other things being equal. Most bikes have about 120 mm travel in the front, with maybe 85 mm of that available on the compression side with a normal setup, but of course you don't want to use all of that so let's say 75 mm. 8% of that is 6.0 mm.

Just trying to give you the numbers. An extra 50 lbs puts you at about 6 mm more sag. Yes, that's a lot and normally calls for stiffer springs to optimize things, but it's also not so much that a preload adjustment can't help quite a bit. If the zip tie says your are bottoming, there is really no reason not to continue adding preload to prevent that. Often best to do it at both ends to keep the geometry similar.
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I'm just afraid of changing it so much. But maybe ill give it a shot, see how it feels. It can always be changed back.
Cheers
 
carboncat said:
I can't understand why you would want no engine brake, the r1 needs it on the straight, stop messing with the electronics, get out there and learn how to ride that thing!
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For people not super smooth on the throttle (like myself) removing some of the engine braking really helps.

Corsara said:
closeup_zpseaee5f11.png
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That is amazing accuracy considering it was in your pocket without a full view of the sky! nice work :)

acernec said:
Very nice! I like how the speedo is showing... excellent way for me to set goals going in/out of turns.
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Did they not make you tape over your speedo? They did for me, but maybe that's a Racer5 thing and they don't enforce it on TMP run days.

-Jamie M.
 
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doozerdave said:
Good thing you moved up to red. That looks terribly annoying... all the straight line warriors. LOL I think I rode in yellow once or twice ever. Did FAST a few times and some private track days before doing open track days.
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I need to get one of those quick shifter and throttle blippers to help me keep up I guess. Anyway the brakes are where its at. Any fuul nose.



Jayv said:
Chris, why do you keep signing up for Intermediate at TMP lol.

Cherrypicker. :)
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I only go to TMP once or twice a year at the most. Although, to be fair, I felt a bit of a cherrypicker yesterday. But, I have to say, I was disappointed in some people in intermediate. They were nowhere near the pace I've previously seen there. TMP need to get their act together and start enforcing some basic guidelines. Letting people choose their own level isn't working. When I finally asked to go to red I was given the sticker, no questions asked. and the person giving me the sticker couldn't have seen me ride one single lap all day.

Corsara said:
I doubt it's 240kph, i bet he has non-stock gearing and no speed adjustment in the form of speedohealer or something like that for the track. so the indicator is definitely off and shows more. That said, video is great, but it shows very well how crowded it was in intermediate, and people were obviously not going that fast either.
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I'm 2 up in the rear which produces (from memory) a 12% variance. So 240kph would become 211kph.

YellowDuck said:
Exactly. He never had a truly clear lap, and still had a 1:22 in there. Time to stop being a big fish in a small pond.

Nice video though. Inline fours. Wow. I am counting something like two or three upshifts per lap. You guys should all try riding twins now and again just to give your left foot something to do.
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Honestly wasn't my intention as I don't really improve. See reasons above. btw, I used to ride a 1098 at the track. I'm way quicker on the 600.


SFer said:
I tweaked preload and compression. Didn't help, we'll it helped a bit, it felt better but I was still bottoming out. You can't fix 50lbs difference with preload.
At least in my eyes.

I've never understood why I have to pay $1000+ just cause I'm bigger.
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Stock suspension on most base Ducs is a crapshoot at the very least. My old 1098 needed respringing and revalving in the front and a complete replacement in the rear before it began to perform well. If you're (or your missus) is intent on selling the SF then don't invest the cash. If you're keeping it then invest the cash. It'll be worth it in the long run, even for street duty. And, imho, you were riding that thing pretty well tbh. You got off the corners pretty well, I had to work to get position.
 
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Corsara said:
For some reason my neck hurts..
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Could probably from being tense from riding. I feel sore from yesterday and I know it's because I was tense from riding TMP.
 
toysareforboys said:
That is amazing accuracy considering it was in your pocket without a full view of the sky! nice work :)
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No, the phone running the Trackmaster app was in my pocket. The Qstarz bt-q818xt bluetooth GPS receiver (set to 5hz) was on the upper tripple held by a couple of rubber bands.
 
YellowDuck said:
How do you figure? Adding preload will have him starting higher in the suspension travel, so he has more positive travel available before bottoming. Yes, the correct spring rate is the best fix (if it is actually wrong), but adding preload to reduce sag certainly can prevent bottoming if there is enough preload adjustment available. It's a better at-track option than riding around with the suspension bottoming out, which can be dangerous.

Adding compression damping can help too of course, since the bottoming is likely happening when he hits a bump with the suspension already highly loaded, (e.g, braking hard for T1, or cornering hard). But with any given compression setting, adding 5 mm of preload will have the suspension 5 mm more extended in any situation.
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I guess I know nothing. I mean I was obviously the slowest guy at this day and you must destroy everyone. The first part is right and but the total resistance against the travel will not change and he will still bottom out. he will also be changing his over all sag settings which can affect the bike in other ways.
 
Corsara said:
No, the phone running the Trackmaster app was in my pocket. The Qstarz bt-q818xt bluetooth GPS receiver (set to 5hz) was on the upper tripple held by a couple of rubber bands.
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Ahhhhhh, that makes more sense :D

-Jamie M.
 
The way you guys are "analyzing data" makes me think you're getting drafted to Moto GP, can I join?
 
gotta do something when you're not flashing ECU's or learning how to put on your tire snuggies in between sessions.

remove warmers
bike off stands
ride
bike on stands
put on warmers
sit and snack/hydrate
repeat
 
For people not super smooth on the throttle (like myself) removing some of the engine braking really helps.


how so? how do you need to reduce engine braking to be smooth on the trottle ?
 
Fiery254 said:
On a similar note; I was amazed by the mount of people in beginner and intermediate with quick shifters. It's like new riders want to go from zero to Moto GP without really learning the basics of riding.
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Mina said:
The way you guys are "analyzing data" makes me think you're getting drafted to Moto GP, can I join?
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It's time for a sub forum Paul. Keep "Track Day Riders" but add a sub forum "Track Day Dreamers, Planners and Fantasists"
 
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