jimmyjonga
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| posted on 12/1/06 at 06:58 PM |
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anyone struggle for traction? (BEC)
hi,
i have a zx9r engined vortx. i have a 3.92 open diff and 195 tyres on 15 rims. when i give the car some stick i end up having to wind on a load of
opposite lock as i feel as one of the driven wheels is just not getting enough grip.
what should i do (apart from less throttle!)
lsd diff?
any suggestions very welcome as i would like to give the car full throttle and stay relatively straight. its frustrating not been able to use the
power available.
james
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Jon Ison
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| posted on 12/1/06 at 07:02 PM |
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maybe you could look at your suspension set up ? soften the rear a little, what trye pressures you running ?
I ran an open diff on the isonblade with no probs.
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Mad Dave
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| posted on 12/1/06 at 07:02 PM |
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I've got a zx9 Indy. I went out yesterday and it spins up so easy, the only difference is that both my tyres are spinning not just one. It
still tries to go sideways so you have to be careful
[Edited on 12/1/06 by Mad Dave]
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froggy
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| posted on 12/1/06 at 07:06 PM |
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how about a course of intensive pie eating
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britishtrident
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| posted on 12/1/06 at 08:06 PM |
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Corner weights need set up
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smart51
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| posted on 12/1/06 at 08:08 PM |
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My R1 vortx only loses traction if you boot it hard out of side roads in 1st gear. I am running 195 50 15s at about 18psi. I have the dampers set at
1 click from zero at the back. 0 clicks makes the ride nice and soft but a bit bouncy. 1 click seems about right for road use. I do have an LSD
mind you.
Check the rear geometry as well. both Toe and camber affect oversteer.
My vortx has more grip than I have courage, certainly on public roads lined with trees, and I have ordinary road tyres fitted at the moment.
Give Marc a ring. I'm sure he'll tell you what settings work best. that or arange to go up there in it and get him to set it up. I
doub't you'll do better than that.
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Lightning
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| posted on 12/1/06 at 08:25 PM |
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I have trouble getting traction, however that might be due to having no tread left and a damp road. Must invest in new tyres soon before plod
notices.
Steve
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JoelP
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| posted on 12/1/06 at 10:42 PM |
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i found today in particular to be a very greasy day, i was wheelspinning all day just driving round in a rush! and that was in a 1.8 estate! But my
locost seems to have excellent grip most days.
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DarrenW
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| posted on 18/1/06 at 10:56 AM |
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Fit a car engine
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smart51
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| posted on 18/1/06 at 11:45 AM |
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quote:
Originally posted by DarrenW
Fit a car engine
That would only make it worse. The high torque / low rev nature of a car engine is more likely to spin the wheels than the lower torque higher rev
range of a bike engine.
Not only that but car engines being heavier, you have to use more torque still to get the same accelerateion. Also, that extra weight is biased
towards the front wheels and so you don't get the increase in traction to match the increase in torque.
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Dale
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| posted on 20/1/06 at 02:07 PM |
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Eat more pie and get some weight on the rear wheels? I cant see the difference between hight torque low revs vs low torque hi revs as the gearing
will put you at the same rear wheel rpm when taking off.
Dale
Thanks
Dale
my 14 and11 year old boys 22
and 19 now want to drive but have to be 25 before insurance will allow. Finally on the road
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smart51
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| posted on 20/1/06 at 09:03 PM |
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quote:
Originally posted by Dale
I cant see the difference between high torque low revs vs low torque hi revs as the gearing will put you at the same rear wheel rpm when taking
off.
Dale
Not so. You will probably gear your car for between 4 and 5 mph per 1000 revs in 1st gear regardless of using a bike or car engine. Your 100 Nm bike
engine will generate half the torque at the wheels as your 200 Nm car engine as the gearing for 1st will be the same. The difference is that your car
engine will run out of revs at about 30 MPH whereas the bike engine will pull all the way to 60.
Beacuse the car engine has more torque, both at the flywheel and at the road wheel because of the same gearing, there is more chance of that higher
torque overcoming the maximum traction that the tyre can provide, causing wheel spin.
[Edited on 20-1-2006 by smart51]
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richijenkin
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| posted on 23/1/06 at 12:15 PM |
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LSD is the way to go!!!!
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smart51
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| posted on 23/1/06 at 12:31 PM |
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quote:
Originally posted by richijenkin
LSD is the way to go!!!!
How much difference does an LSD make? I've never driven a seven without one. on slipery roads I can struggle to get the power down in 1st gear
but it never gets out of hand. I guess without an LSD I'd be sliding about the whole time.
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