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SD1 LT77 transducer DRC 8007A
Posted: Sun Feb 27, 2011 6:33 pm
by martin_t
Hi
I am looking for a speedo transducer for an LT77 box on my Kit Car application (3.5 V8 SD1). Can anyone tell me if the DRC 8007 fitted to the LT77 on the old Jaguar's is the same transducer as the DRC 8007A fitted to the Rovers? Also, I know these units are as rare as "hens teeth", but can anyone advise where I can get one from, at a reasonable price?
Many Thanks
Martin
Posted: Sun Feb 27, 2011 7:12 pm
by ged
Hi Martin,
What's your final drive ratio?
Regards Ged
Posted: Sun Feb 27, 2011 7:15 pm
by martin_t
ged wrote:Hi Martin,
What's your final drive ratio?
Regards Ged
Hi Ged
Its a 3.31 diff
Regards
Martin
Posted: Sun Feb 27, 2011 7:43 pm
by ged
Hi again,
I forgot to ask what size wheels & tyres .
Regards Ged
Posted: Sun Feb 27, 2011 7:44 pm
by martin_t
ged wrote:Hi again,
I forgot to ask what size wheels & tyres .
Regards Ged
245 x 18 on the front
275 x 18 on the back
Cheers
Martin
Posted: Sun Feb 27, 2011 7:50 pm
by ged
Hi Martin,
Do you have the profile % of the rear tyre?
ie 275x30x18
Regards Ged
Posted: Sun Feb 27, 2011 9:52 pm
by martin_t
ged wrote:Hi Martin,
Do you have the profile % of the rear tyre?
ie 275x30x18
Regards Ged
275x40 zr18
Regards
Martin
Posted: Mon Feb 28, 2011 8:45 am
by ged
Hi Martin,
If I've done my calcs right 20 teeth seems correct. I had a look through my spares & only found one 20 tooth transducer & it's been butchered.
If you have no luck how about trying a 22 tooth( red gear) & having your speedo recalibrated.
Sorry not much help I know.
Regards Ged
Re: SD1 LT77 transducer DRC 8007A
Posted: Mon Feb 28, 2011 9:33 am
by DaveEFI
martin_t wrote:Hi
I am looking for a speedo transducer for an LT77 box on my Kit Car application (3.5 V8 SD1). Can anyone tell me if the DRC 8007 fitted to the LT77 on the old Jaguar's is the same transducer as the DRC 8007A fitted to the Rovers? Also, I know these units are as rare as "hens teeth", but can anyone advise where I can get one from, at a reasonable price?
Many Thanks
Martin
That's the 20 teeth one (orange) for the 3.08 rear axle so the most common.
DRC8172 is the same but with a different connector.
Other ratio ones are still available, and you could use an alternative plus a Jaycar speedo corrector. But of course you'd have to change the internal drive gear to the matching one.
If you have the original and it's not working, some say they can be repaired. The usual fault is a lead fractures where it is soldered to the coil. So you need to dig out the epoxy sealant.
Re: SD1 LT77 transducer DRC 8007A
Posted: Mon Feb 28, 2011 11:23 am
by martin_t
DaveEFI wrote:martin_t wrote:Hi
I am looking for a speedo transducer for an LT77 box on my Kit Car application (3.5 V8 SD1). Can anyone tell me if the DRC 8007 fitted to the LT77 on the old Jaguar's is the same transducer as the DRC 8007A fitted to the Rovers? Also, I know these units are as rare as "hens teeth", but can anyone advise where I can get one from, at a reasonable price?
Many Thanks
Martin
That's the 20 teeth one (orange) for the 3.08 rear axle so the most common.
DRC8172 is the same but with a different connector.
Other ratio ones are still available, and you could use an alternative plus a Jaycar speedo corrector. But of course you'd have to change the internal drive gear to the matching one.
If you have the original and it's not working, some say they can be repaired. The usual fault is a lead fractures where it is soldered to the coil. So you need to dig out the epoxy sealant.
Thanks for the info.
Could you tell me a way of testing the transducer to check if its OK or not? (without the engine running or car rolling as I am not in the position at the moment).
Thanks
Martin