i want to change from the usual magnet pickup for my acewell. Been looking at a 90 deg drive adapter as the gearbox doesn't have much clearance, Europa spares one.

Then stick a granada sender in it which from what i can find has 3 wires.

The acewell only has 2 wires.

Will this work? and how would i wire it.

On the calibration part how is this done? i understand the magnet way of doing things but not with this way

Acewell wires are an in+ out- loop from the unit.

I think (but don't quote me!) one of the sensor wires goes to ground.

Hope someone can confirm as I want to do exactly the same

Is the granada sender from an MT75? If so this definitley works / if not maybe all ford senders are the same. The sender has a 12v feed (black), a wire to earth (brown), and an pulsed 12v output (yellow). The output is too much for the Acewell which needs 5 or 6 volts. I ran the out put through a LM7805 voltage regulator which reduced the voltage to the right level. Im told the voltage reg my not be up to high frequencies but it certainly works up to 70 ish - Ill check how much higher it will go on my next trackday.

Youll need to work out the correct setting on your acewell for all this to translate to the right speed. Mine is set at 180mm per pulse.

[Edited on 23/4/09 by smac]

So, instead of 12V+ can you not use the + output from the Acewell or is the sensor not up to the lower voltage?

The Granada sender (type 9) fits into the gear box from the side (and replaces) that the gearbox driven wheel is fitted from. You would then need to seal the normal cable drive hole and tap the housing so that you could clamp the sensor into its fitment hole.

Yes it has 3 wires +ve feed, pulse and earth.

Hope this helps.

[Edited on 23/4/09 by jollygreengiant]

Well perhaps. I tried it and it didnt work but I dont really know why - and the voltage reg was only 90p so I didnt try it again

[Edited on 23/4/09 by smac]

Not that simple I am afraid.

The acewell just switches to ground on the speedo input. One wire goes to reed switch, other side of switch to ground.

David

The supplied sensor is a reed switch but it will also work with a hall sensor - it just sees the pulse.

[Edited on 23/4/09 by smac]

[Edited on 23/4/09 by smac]

quote:

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Originally posted by flak monkey
Not that simple I am afraid.

The acewell just switches to ground on the speedo input. One wire goes to reed switch, other side of switch to ground.

David

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A 7805 will work up to at least 5 MHz so you should be ok

Lost me there...

quote:

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Originally posted by Macbeast
A 7805 will work up to at least 5 MHz so you should be ok

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now this is confusing, so it won't work the way i was hoping.

Any ideas on how to do this, i hate the magnet set-up

Right

A fused 12 v supply to the sender unit, from the sender unit one wire to earth, and one to the voltage reg ( or some other means of getting the voltage from 12 to 6 volts).

If you use the LM7805, this has three terminals, Signal in (from the sender) earth and signal out ( to the acewell)

The acewll has two wires for the speedo pickup. One of these is a 5v out , ignore this and wire the output from the LM7805 to the other.

You can test all this of the car by spinning the sender inut end in a drill

just to check the LM7805 do i take it the signal wire from the sender connects to the input, ground to ground and the output to the acewell

Yes except connect the grounds to earth, not together.

i'll give that a go, any ideas on what year granada the sender comes from, going to try parts finder

Sorry dont know. Mine was out of a sierra but I know they dont all have the electric sender

Got mine off a FWD box, are they the same, and, where can I get a LM7805?

http://www.maplin.co.uk/Module.aspx?moduleno=10529

Now only 63p!

cheers for all the help, off to buy all the bits now

just a quick update, have made the small circuit and fitted all the parts except i get no reading on the acewell display. When the signal cable has a multimeter on it the reading is 5v constant and changes lower when moving, but when connected to the connector on the acewell (0v one not the constant 5v one) it just earths and reads nothing. SHould i be connecting it to the constant 5v?

It might help to programme the acewell to accept a lower figure of pulses per mile to see if its registering anything at all ie set it to the largest wheel circumfrerence possible and see if anything changes.

i tried it down at 50, 555, 1555 and nothing do you mean up at 5000 odd?

just tested at 3000 and nothing

this is how i have it wired

How did you get on?

/

not figured it out yet, i have now blown the 7805 chip thing so have to buy another 1 or 2

i have no idea how to make this work, fitted a new 7805 and put a multimeter on the output wire and it reads 5v down to 0v when spinning the sensor, but if i connect it to the acewell 0v side of the connector nothing at all. changed the circumference settings from low to high and in between but nothing.

This is driving me nuts

I thougth the acewell just works off an looped earth supply with a reed switch making the supply back to the unit when the magnet passes it.

Just checked my and there are deff no voltages on either of the sensor wires.

i have a 3250, i know some differ.

i have now found with my circuit connected to everything apart from the acewell. If i touch the 5v from the acewell on the heatsink on the 7805 (effectively earthing it) i get a reading.

With is in mind i have connected the 5v from acewell to the signal from the 7805 and spin the sender in a drill i find the volts never drop fully to earth.

My problem seems to be an earth related thing. is there a component that has a constant 5v input that can earth when a voltage is applied to it like a relay?

I've finally sorted it with the addition of a transistor. just need to calibrate the set-up to make sure of faultless readings but it works in a drill

final update, had the speedo working up to 80 and it's perfect, cheers for all the help