Has anyone figured out how to get the gear position information in a signal for the five speed transmissions?

 

Suzuki did it many years ago on their m/cycles by putting a sensor in the gearbox that looked at the shift drum. The signal was sent to a led display where gears 1-5 were numerically displayed with a seperate neutral light.

Same principles could apply on the 928 although the gear lever position confirms the engaged cogs.

 

Just as a dashboard display indicator? or for some other purpose?

I've not heard of it - it would be a little complicated to implement I think...

Alan

 

You could do it electronically, like CASIS (shift light) does. RPM versus road speed.





Nerd alert! CASIS is a real computer - 8039 ECU w/2716 EPROM, just like what's in an EZF brain. The dead CASIS tach from my '85 has (at minimum) a bad resistor and diode, so when I get to soldering on there, I'm going to remove the EPROM (install a socket), and read the code off of it.

 

Rpm vs speed with wheel sensor/magnet is easiest....most data loggers use this method if an on board feed is not available.

 

This may be too troglodytic, but how about six switches installed where the shift lever will hit them?

(My first bike, by the way, was a GS650G with a gear indicator. My motorcycling friends saw it and asked, "why?")

 

I would actually like one for my '85. I can't always remember what gear it's in, and don't want to take my eyes off the road...

$75

 

This will work...cheap enough too.

http://www.hardracing.com/digitalgearindicator.htm

 

You guys are being serious or is this a Danglerb thing?

 

The flyin' scotsman and Gtaerb: Yes, I found many products for motorcycles and cars with sequential gear boxes. However, I can't find a product for regular, non-sequential manual gearbox.

Alan: This is for selecting a different boost-rpm profile for different gears.

PorKen and Gtaerb: I could compare RPM and wheel speed. This would have to come from rear wheels to deal with wheel spin. Also, I'd like to identify neutral as well and get accurate readings when the clutch is depressed. Finally, and this may be nitpicking, I'd always like to go as far upstream as possible towards the driver on any control inputs to minimize latency.

GregBBRD: I can't speak for others, but I am serious at least on my own seriousness scale. What is "a Danglerb thing?"


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Specifically, I am reading thru the documentation of eboost2 controller, and it's clear that the minimum setup I need is the following. Two wires A and B, which can be selectively grounded. Neither grounded selects profile I. Wire A grounded, wire B not grounded selects profile II. Wire A not grounded, wire B grounded selects profile III. Both wires A and B grounded selects profile IV.

The plan is to associate gears N, R, and 1 with profile I, gear 2 with profile II, gear 3 with profile II, and gears 4 and 5 with profile IV. The max torque of profile I < II < III < IV.

The current plan is to use three microswitches, two of which are regular and third of which has two isolated circuits (basically just like two switches glued together.) The first switch grounds wire A if and only if the second gear is on. The second switch grounds wire B if and only the third gear is on. The third (dual circuit) switch grounds both wire A and B if the gear selector is in the extreme right position (either gear 4 or 5). Neither wire is grounded when on reverse, first, or neutral (as long as the shifter is not pushed to the extreme right on neutral, in which case both wires are grounded.)

I am planning to bring in three wires into this set of switches, A, B and ground, and take the ground all the way to the boost controller's ground.

If you see something dumb in this plan, let me know.

 

Ken,

Instead of Micro switches here is a nice solution using 2 Linear potentiometers and circuit to boot....
http://www.scribd.com/doc/7098036/Ca...cator-Abstract

Clutch would be easy to add...

 

Wouldn't it be easeir to learn to drive a standard than isntalling this Danglerb, system?

 

Greg,

I think they are.... they need to feel the force and become more in-tune with their 928s.

I don't get to drive mine near as much as I would like to, but I would know what gear I am in stone dead drunk and half asleep...with my eyes closed.

BUT, I do have to admit I like gadgets like that and thought about getting one for one of my Crotch Rocket bikes years ago.

Why not skip "just" the indicator by itself and go all the way with paddle shifters AND an Indicator!!

BTW, did anyone else catch the "RPM" (Racing Per Matchett) segment on the F1 race this weekend where they showed the guts of the F1 tranny and discussed how it shifted the gears. I couldn't believe how small that thing was... amazing stuff!!

 

I just use my hand to feel the position the shifter is in, while monitoring rpm and speed.

If that fails I look down at the shifter.

If that fails, well I guess I'm just a failure.

 

Highjack: Yep that RPM segment was awesome. I couldnt' believe how small those F1 gears were. I wonder what alloys they are made of.

I can definately see the use of this in a boost/timing controller application. Good luck!