LT77 speedo sensor takeoff ?

[hfbradley01]

Looking at my ETB speedometer instructions it looks like I can either :-

a) use the magnets and sensor I bought

b) use the speedo takeoff on the LT77 gearbox.

Firstly....have I understood the instructions correctly ?

If I have....which would be the best solution ?

My instincts tell me that the LT77 takeoff would be better because it's a tried and tested mechanism, whereas the magnets and sensor would add additional risk i.e. magnets flying off the prop shaft.

If anyone has used the LT77 gearbox takeoff I would be interested to hear about your experiences.

Cheers

[stevey]

Hi I have used the sensor on my LT77 with no problem if you have a problem with magnets flying off(which they are unlikely to if stuck on properly) why not upgrade your etb sensor to use the four propshaft nuts I did this and it is fine mount your sender from the side of the tunnel not underneath though (doh!)and it will be ok
Steve

[tonym]

Hi I'm using the LT77 take-off and it works just fine although the sensor itself failed a few years ago but was easily replaced. Make sure you follow ETB's instructions re the resistor

[hfbradley01]

Originally Posted by tonym

Hi I'm using the LT77 take-off and it works just fine although the sensor itself failed a few years ago but was easily replaced. Make sure you follow ETB's instructions re the resistor

Thanks Tony, why re-invent the wheel if you don't have to. I'll check out the ETB website regarding the resistor.

Looking forward to meeting up with you at LeMans, or on the way even.

Cheers

[Marty V6]

Hi,

I have ETB instruments in my Cobra, and use a wheel with holes in it (daisy wheel type) which is bolted to the prop flange and the sensor counts the holes rather than sensing the magnet. Car came like this when I bought it, so I can only presume that this kit was sourced from ETB. No chance of anything coming flying off with this set up, and have never had a problem with it in the four years I have had the car.

Cheers

Marty

[hfbradley01]

Originally Posted by Marty V6

Hi,

I have ETB instruments in my Cobra, and use a wheel with holes in it (daisy wheel type) which is bolted to the prop flange and the sensor counts the holes rather than sensing the magnet. Car came like this when I bought it, so I can only presume that this kit was sourced from ETB. No chance of anything coming flying off with this set up, and have never had a problem with it in the four years I have had the car.

Cheers

Marty

Hi Marty,thanks for the reply.

Tony has confirmed that the LT77 gearbox (standard R/3 gearbox) has a built in unit for an electronic speedo, it would make sense to utilise this,and eliminate the work and risk of adding an additional sensor.

I've seen the setup you mention and I'm sure it works just fine.

Cheers

[russell_ram]

And just as info for others, the standard R380/LT77 elec sensor works perfectly with 'Smiths' electronic speedos also.

Russ

[realyweely]

Ive just fitted a speedo and sensor from Europa and it doesnt even use magnets.
Made up a small bracket to attach to the end of the gearbox and the sensor is fixed close to the propshaft bolts and picks up off them.
The end of the sensor actually flashes when its connected up to 12V which allows you to fit it just right.

[steve_h]

I was thinking of using the gearbox sensor too

would the ETB speedo work with a tremec electronic take off?

steve

[hfbradley01]

Originally Posted by steve_h

I was thinking of using the gearbox sensor too

would the ETB speedo work with a tremec electronic take off?

steve

Hi Steve

Your best bet is to ring the guy at ETB and ask him, he's pretty good.

Cheers