daniel mason
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| posted on 13/12/14 at 05:51 PM |
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Can someone explain exact advantages of closed loop setup?
Currently my force is fitted with:
Gsxr1000 k6 motor with 6 speed sequential,
Innovate wideband O2 system,
Dta s60 pro ecu with race loom,
It also has full flatshifter setup with flatshifter max,expert, paddles and blipper.
Now the flatshifter cuts ignition at a set time. The same time for every shift In Every gear at any speed!
Is there an advantage of a closed loop shift system over the flatshifter for safer changes?
And what can be retained from the flatshifter setup for a closed loop shift setup
And what are the benefits of closed loop mapping?
Cheers guys!
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sam919
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| posted on 13/12/14 at 06:10 PM |
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Have a word with David Loomes at xoomspeed! he knows all
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daniel mason
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| posted on 13/12/14 at 06:31 PM |
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I was looking at there kit before. It's fully pneumatic too I think!
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jeffw
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| posted on 13/12/14 at 07:10 PM |
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The Geartronics site makes the case for close loop over timed changes
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sam919
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| posted on 14/12/14 at 01:28 PM |
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As far as i can think, a closed loop system is done by measuring positions of gear levers and components in the system so it knows when things are
being pushed and when they have been engaged, and bases its controls/ up shift / down shift on these measurements. An open loop is done by activating
a duration based control system, so irrespective of the position of the gears/ levers/ selectors- up shifts/ downshifts, it still makes a movement
when its told to do so, and for 'x' time, so effectively it could still be giving a command when the mechanical side of things has been
achieved...when it doesn't need to and where a 'measured' system would be acknowledging the commands would have been completed.
Then again......i may be wrong,but in a nutshell i think the closed loop will give a more accurate gear selection each way.
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sam919
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| posted on 14/12/14 at 01:30 PM |
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quote:
Originally posted by daniel mason
I was looking at there kit before. It's fully pneumatic too I think!
Yes it is, very reliable, very effective and has fantastic customer support, we have earmarked three for various projects
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daniel mason
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| posted on 14/12/14 at 01:36 PM |
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If you have time can you pm me a rough price for it? Cheers
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Theshed
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| posted on 14/12/14 at 07:36 PM |
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If you are going pneumatic then you can save a lot by lurking on ebay. I bought a Geartronics GCU but am too tight to buy their, no doubt wonderful,
compressor/accumulator/valve block, You can find a perfectly good 12v compressor on ebay from about 20 quid - landrovers use a thomas pump for their
air suspension - these are really small and light. I got a brand new one from a LMP car for about £100. As for valves they are from a fiver to 25 quid
depending on the make. Apparently paintball air tanks make good light accumulators (I am making my own to anodise it groovy colours).
No reason why you could not use your existing paddles....provided you have an up and down switch. The biggest issue is the feedback sensor - you will
need to chat to the GCU maker.
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daniel mason
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| posted on 14/12/14 at 07:47 PM |
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Yeah. There's a guy selling a geartronics gcu with geartronics gear indicator! But I was under the impression that by the time I've fitted
the actuator unit,valve block, accumulator, loom and throttle blipper as well as gearbox sensors then I'll be seriously outof pocket?
Unless you know where these can be found?
[Edited on 14/12/14 by daniel mason]
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Theshed
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| posted on 14/12/14 at 08:41 PM |
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Well ... I did not say cheap but hey this is motorsport!
The accumulator you could make yourself for a tenner - its just a pressure vessel.
Valve block - just 3 x 3/2 pneumatic solonoids
Loom? fairly straightforward - geartronics website have a diagram
Actuator - about £20 from the bay - look for pneumatic actuators.
If you are a cheapskate then use push in fittings
This is after all locost....
of alternatively buy the whole system for about £4k from one of the big boys.....
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daniel mason
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| posted on 14/12/14 at 08:50 PM |
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What air gear shift actuator did you use?
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Theshed
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| posted on 16/12/14 at 11:16 AM |
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I have something like this -
Pneumatic actuator cylinder Martonair M/6025/25
I see you have bitten the bullet and are flogging your electric system. What are you going with?
There are some nice compressors available at reasonable cost - THOMAS 115ADC56/12 Air Compressor,1/10HP,12VDCV
Search for discovery air suspension
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jeffw
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| posted on 16/12/14 at 11:50 AM |
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Ummm....got me thinking now. Geartronics want £4K +VAT
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Theshed
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| posted on 16/12/14 at 12:21 PM |
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I asked Geartronics if they would just sell me a GCU and they were quite happy to do so. It came with a plug and software. I think it was just under
£850 (Yes that is one Locost plus £600 - I did not say cheap...). I was very impressed with Neil at Geartronics he was very helpful. Whilst they
obviously supply some high end users he was prepared to deal with a happy amateur. This unit will talk to my Motec ECU very easily.
The manual and software are very straightforward. I cannot comment on how it works in practice as I am still building (12 years and counting).
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