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Cornering a two-stroke

 
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steff_dk



Joined: 14 Jun 2015
Posts: 88
Location: Denmark

PostPosted: Sat Jun 11, 2016 3:31 pm    Post subject: Cornering a two-stroke Reply with quote

Did my first trackday on the V-due yesterday.
The bike is a completely different beast from the Duc 748 I had.
On the Ducati I would go down through the gears and let the engine brake, before hitting the brakes and turn in.

On the V-due I found myself wanting to grab some brake before going down the gears, and then brake again and turn in.

I think it is because there was no mentionable engine braking going on, and I am a bit unsure of the lubrication of the pistons when I am off the throttle ...
It revs pretty high especially when coming down the straight and into a corner.

How do you guys go about this?

Obviously the lack of engine braking caught me by surprise a couple of times and I came in much too hot and ran wide - but I am learning Rolling Eyes
On the other hand I could see that even when I got it right, the V-due preferred turning in much later than the rest of the gang.
I was happy to see that it had no problem hanging onto bigger bikes on the straight.

What an amazing bike it is! Very Happy

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steff_dk



Joined: 14 Jun 2015
Posts: 88
Location: Denmark

PostPosted: Sat Jun 11, 2016 7:43 pm    Post subject: Reply with quote

Food for thought ...
https://www.youtube.com/watch?v=LrbZJbXwgrY

I suppose I am doing a combination of those bad habits that start at 2:25 Rolling Eyes
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Bud977



Joined: 03 Mar 2013
Posts: 525
Location: Sydney

PostPosted: Sat Jun 11, 2016 10:18 pm    Post subject: Reply with quote

Yes, you want to get rid of that habit of changing down gears first. Brakes are for stopping, gears are for matching the engine RPM to the road speed.

When approaching a corner, pick your braking marker and apply the brakes. Always use the front brake. The rear brake is optional.

As you approach the apex, change down gears so that you end up in the right gear to drive out of the corner. You should be in the correct gear before you hit the apex.

I use a fair bit of engine braking, even on a two stroke. As you brake, change down to keep the revs in the desired RPM range. I'd imagine on a VDue that would be 6000-9000 RPM.

As you improve, you can move your braking marker further down the track.

Good luck and I'm very envious of you getting to ride a VDue on the track.
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trev45



Joined: 15 Jun 2011
Posts: 449
Location: Sydney Australia

PostPosted: Sat Jun 11, 2016 11:58 pm    Post subject: Reply with quote

They are great on the track

Trev
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Matty82



Joined: 10 Jul 2014
Posts: 155

PostPosted: Sun Jun 12, 2016 11:55 am    Post subject: Reply with quote

Trev, I'm building a track only vdue, in your opinion carb or injection?
Cheers
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2SMOKE
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trev45



Joined: 15 Jun 2011
Posts: 449
Location: Sydney Australia

PostPosted: Mon Jun 13, 2016 1:23 am    Post subject: Reply with quote

Carb is easy , simple and works

EFI can work fine but with some up grades
or with a new system as the standed Bimota
set is a little ruff for racing it hard and fast

Get out on the track you will love it

Trev
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redrobin911



Joined: 11 Mar 2016
Posts: 9

PostPosted: Wed Jun 15, 2016 11:13 pm    Post subject: Reply with quote

I agree - i used to race a TZ250 and now race Porsche 911's (vintage 65 911) and in all forms of motorsport the engine is not used for braking unless - a, your brakes run that hot that they fade and you need the engine braking to assist braking/prolong the time to brake fade or use the engine braking to help setup the direction of the car/bike at turn in - or both. This engine braking is widly seen in bike racing when trying "back up" into a corner - same thing can be achieved in a car and helps throw the rear out to get the correct turn in angle.
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