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galderdi
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Posted: 16 March 2017 at 5:09am | IP Logged Quote galderdi














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galderdi
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Tinker
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Posted: 16 March 2017 at 11:12am | IP Logged Quote Tinker

Thank you for your very informative reply. I'll look at the videos later, the pictures look great.
Now I know you were sitting in a kind of go cart with a roll bar and seem to have lots of fun.

I assume its rear wheel drive? Does the electric motor have regenerative braking? If it has could you not tweak that to act like your hand brake when you get to a tight corner?

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galderdi
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Posted: 16 March 2017 at 11:01pm | IP Logged Quote galderdi

No problems. No it is front wheel drive. I chose FWD for 2 main reasons.

Firstly I can put my expensive/sticky tyres on the front and old/hard/thin tyres on the back and still get great performance. With rear wheel drive you have to put sticky tyres on all 4 corners to get performance.

Secondly FWD tends to be ever so slightly quicker in motorkhana.

No regen unfortunately. I haven't had experience with regen but I imagine it wouldn't lock the hubs, if that is true it wouldn't help with handbrake turns. Unless it was applied at the same tiem as a handbrake.

Also the other usual questions are about AWD and All wheel steer. Both of these are against the rules in my sport.
As is anti lock brakes and traction control.

I have just started work on the next car. It is probably 18 months away from completion. I will keep the existing car and it will focus on the higher speed events to which it is more suited (due to the larger footprint). The new one will be a pure motorkhana car. It will still be FWD. It will be a bit shorter, single seat, slightly narrower in the front, much narrower in the rear. I am aiming for sub 300KG. The motor will be the baby brother of this motor (8 inch instead of the 9 inch). But the power to weight will probably increase overall due to the targetted 40% weight loss.
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Posted: 16 March 2017 at 11:26pm | IP Logged Quote Gizmo

Is it worth considering the steering ratio? I see there's a bit of hand over hand steering going on, would a lower ratio steering box help? I used to race speedway in Mackay many years ago and as you would know there is a lot of steering wheel action going on. One of the fastest cars in class was a Ford Falcon XD, 250 6cylinder. The owner had changed the steering box to a low ratio, so had to turn the steering wheel a lot less end to end. This meant he had to run a hydraulic steering pump, which did drain some power. But he said the loss of power was nothing compared to the gains in steering control.

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galderdi
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Posted: 17 March 2017 at 1:50am | IP Logged Quote galderdi

Thanks, yes it is high on the agenda. This rack was sold as a quick rack. Clearly that was a lie. I am not sure it is worth the cost and effort for this car as I will retire this car from motorkhana in 18 months. The ratio won't be an issue for the higher speed events.

The new car will definitly get a quicker rack. I did have details for a source of performance racks but I seem to have misplaced it.
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galderdi
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Posted: 27 March 2017 at 11:51pm | IP Logged Quote galderdi

I was competing in Rounds 1 & 2 of the Queensland Motorkhana Championship in Gladstone over the weekend.

In preparation for the event I had a trailer brake pad seperate from it's backing plate. So I replaced that before leaving as travelling for about 18 hours round trip with no trailer brakes didn't appeal to me.
I tried to adjust my clutch cable, but in the end the cable gave way and sunk into the sheath. Luckily I didn't need the clutch for this weekend anyway.
Then when loading the car on the trailer I realised the throttle was playing up. I eventually reverted to an older throttle I had as a spare.

Luckily the weather held out despite the looming tropical Cyclone further north.
The first day the car was running very well and I was positioned in 3rd for most of the day.
But later in the day the heat got to me and I had a brain fade moments.
I still managed to place 6th outright which isn't bad considering I got 3 tests wrong out of 12.
At the end of the last run on day 1 it was apparrent I had developed a significant vibration. I beleived it to be a loose bolt from the flywheel or clutch plate putting the flywheel out of balance. Or potentially a worn gearbox bearing. The motor itself still seems to spin smoothly.
With little time and without my workshop facilities I could not risk separating the motor and gearbox to inspect the problem.
At the end of day 1 I was faced with the decision to protect the vehicle or continue with day 2. If the event didn't figure in the season standings I would have pulled out.
But as it was Round 2 of the Motorkhana season I decided I would proceed with caution.
I figured I would coast through the day with the aim to complete at least 50% to at least earn some more points towards the season championship.

On day 2 I found the vibration was worse at low revs. I was hoping it was just the clutch out of centre, but my clutch cable was out of action so I could not release the clutch to help it re-centre (if that was the problem).
But I pushed on. For any medium to long tests I selected 2nd gear from the start and turned the current up.
This was my attempt to keep the revs at a managable level and not do any further damage. I also periodically cooled my head with ice, which I think helped me concentrate, resulting in better results.
In the end I managed to achieve 3rd outright for day 2 which was about my target coming into the weekend and well exceeded my expectation after developing the vibration.

I have packed the car away as we have some really bad weather looming for the next few days. Hopefully this weekend I will be able to pull it apart and identify the problem.
My next event is a khanacross on April 9th (2 weeks). Hopefully it is a quick fix other wise I will miss my second khanacross in a row.
That would be devastating as the car is much better suited to khanacross and I have been really looking forward to seeing the car's true potential.
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