Astra/ corsa b speedo

Help and advice section for technical questions on your Corsa.
Please check that your query hasn't already been answered in FAQ and Technical Info section.

Moderator: Octane2097

Post Reply
User avatar
ukhozi
CB-Uk User
Posts: 115
Joined: Thu May 26, 2011 5:30 pm
Location: Estepona, Spain
Contact:

Astra/ corsa b speedo

Post by ukhozi »

I have a Astra GTE speedo and tried using an aftermarket sender for speedo but can't get anything near the correct speed.
Does the sensor output have to go via a ECU?
I was hoping it was analog like the MG Maestro one I had before which was 8 pulses per rev. Is there an aftermarket transponder that works at wheel speed as I need to take it from the front wheel, no gearbox take off point. 740 revs per mile.


Sent from my Vodafone Smart 4 turbo using Tapatalk
1995 Corsa B Sport, c14se
2001 Mercedes A170 CDi LWB Elegance
1999 Suzuki AN400 (425)
User avatar
ukhozi
CB-Uk User
Posts: 115
Joined: Thu May 26, 2011 5:30 pm
Location: Estepona, Spain
Contact:

Re: Astra/ corsa b speedo

Post by ukhozi »

Also, anyone know what the little red slide switch on top of the speedo is for?

Sent from my Vodafone Smart 4 turbo using Tapatalk
1995 Corsa B Sport, c14se
2001 Mercedes A170 CDi LWB Elegance
1999 Suzuki AN400 (425)
User avatar
coupe77
CB-Uk User
Posts: 597
Joined: Tue Mar 11, 2014 3:52 pm
Location: manchester

Re: Astra/ corsa b speedo

Post by coupe77 »

You need the gte transponder as the dash takes the pulse from that
It has 3 wires
You might have to fit the early cable box
Or find out what the wires on the corsa transponder do then work out the pulse wire to the speedo
Other hub speed sensors take the pulse from the abs ecu


Sent from my iPhone using Tapatalk
https://www.facebook.com/pages/Jeacotts-motors/611022572351820
User avatar
ukhozi
CB-Uk User
Posts: 115
Joined: Thu May 26, 2011 5:30 pm
Location: Estepona, Spain
Contact:

Re: Astra/ corsa b speedo

Post by ukhozi »

No GM gearbox to fit transponder to. It will have to be front wheel driven.
Apparently the switch gives a change of 2.56:1 ratio difference for the same pulses.

Sent from my Vodafone Smart 4 turbo using Tapatalk
1995 Corsa B Sport, c14se
2001 Mercedes A170 CDi LWB Elegance
1999 Suzuki AN400 (425)
User avatar
ukhozi
CB-Uk User
Posts: 115
Joined: Thu May 26, 2011 5:30 pm
Location: Estepona, Spain
Contact:

Re: Astra/ corsa b speedo

Post by ukhozi »

Still slogging on, I now know the transponder for the speedo takes its pulses from a gear in the gearbox, as it counts the number of teeth. so what gear is it or is it a sensor ring and how many teeth so I can then fit the corrected number of teeth to my front hub LIKE an ABS ring.
1995 Corsa B Sport, c14se
2001 Mercedes A170 CDi LWB Elegance
1999 Suzuki AN400 (425)
User avatar
ukhozi
CB-Uk User
Posts: 115
Joined: Thu May 26, 2011 5:30 pm
Location: Estepona, Spain
Contact:

Re: Astra/ corsa b speedo

Post by ukhozi »

Still no answer.

How many pulses are needed to get the GTe speedo to read 60mph?

How I get those pulses will be down to me but I still need an answer.

I have been told that I should be looking at 15,000 ppm
÷ by 750 wheel revs pm that gives 20 pulses per wheel rev.

Help!
1995 Corsa B Sport, c14se
2001 Mercedes A170 CDi LWB Elegance
1999 Suzuki AN400 (425)
Post Reply