Speedo correction.

Home Guard · Oct 12, 2014

Is there any way in which I can alter the speedo reading if I were to fit larger wheels and tyres?

I have seen the speedo correction kit, but that looks like a pain in the ass to fit.

Thanks

thebiglad · Oct 12, 2014

Home Guard said:
Is there any way in which I can alter the speedo reading if I were to fit larger wheels and tyres?

I have seen the speedo correction kit, but that looks like a pain in the ass to fit.

Thanks

It's not something I've done personally but I'm pretty sure there is a correction facility in the BCU software - you'll need a dedicated LR diagnostic terminal to access it though.

auf_wiedersehen_pet · Oct 12, 2014

Is there anyway to do it on a D1?

thebiglad · Oct 12, 2014

auf_wiedersehen_pet said:
Is there anyway to do it on a D1?

The speedo is controlled by a sensor in the Tbox and I believe you can get different versions of this.

auf_wiedersehen_pet · Oct 12, 2014

thebiglad said:
The speedo is controlled by a sensor in the Tbox and I believe you can get different versions of this.

Ooh - that's good timing with a new TBox sitting on the bench. Anybody know if there are part numbers? I'm fitting a standard Defender 1.410 Box to a Disco auto with 34.5" tyres.

jamesmartin · Oct 12, 2014

auf_wiedersehen_pet said:
Ooh - that's good timing with a new TBox sitting on the bench. Anybody know if there are part numbers? I'm fitting a standard Defender 1.410 Box to a Disco auto with 34.5" tyres.

frc3310 blue speedo drive is lrs choice for largest tyre

auf_wiedersehen_pet · Oct 12, 2014

jamesmartin said:
frc3310 blue speedo drive is lrs choice for largest tyre

.....and in the nicest possible way can you tell me where to stick it?

Does it fit in the TBox as Dave said?

A quick search leads me to FRC3310 | Speedo Drive Gear Def Ds1 - Land Rover Part FRC3310 which says "Speedo drive gear with part number FRC3310. Fits Defenders and Discovery 1. Blue with 20 teeth for vehicles with 750x16 tyres".

750/16 are 31" I think? That must give me a better reading than one designed for 29" standard tyres.

jamesmartin · Oct 12, 2014

just prise out speedo housing from the rear output housing

auf_wiedersehen_pet · Oct 12, 2014

jamesmartin said:
just prise out speedo housing from the rear output housing

Wicked - been out to the garage and dug a red gear out. Blue one being ordered tonight. Although the indicated speed will be 10% low with blue, it's better than the 20% it is currently.

Gregja · Mar 15, 2015

Back on topic what are the options for the discovery II is there an adjuster on the back of the binacle?

discool · Mar 15, 2015

Gregja said:
Back on topic what are the options for the discovery II is there an adjuster on the back of the binacle?

Always a good idea to read the tread first, isn't post #2 any help?

sierrafery · Mar 15, 2015

Gregja said:
Back on topic what are the options for the discovery II is there an adjuster on the back of the binacle?

NO, you can't do that on a D2, there's no built in option for that cos it's a PWM signal from the ABS ECU(unfortunately biglad in post #2 is wrong), only a speedo correction unit will do that but not any, there are some which will not work so you must get one which is confirmed for D2, also if it's automatic you must connect it as to affect the transmission ECU too or there will be a missmatch between the VSS in the engine ECU and EAT ECU and the shifting will suffer... BUT if the vehile is fitted with ACE you must isolate that from the corrected signal cos it will disturb the ACE ECU... doable but not very easy

Gregja · Mar 15, 2015

discool said:
Always a good idea to read the tread first, isn't post #2 any help?

Sort of I understand the whole square wave baseline signal and was hoping rather than over complicating the situation it might be a simple case of adjusting something in the binacle.

As mentioned above Sierrafera pointed out that most box of tricks don't work and it's directly linked to the abs system most info I found online is from up to 10 years ago I thought there might be a new development for 2015

sierrafery · Mar 15, 2015

Gregja said:
.... most info I found online is from up to 10 years ago I thought there might be a new development for 2015

the info is the same like 10 years ago as they didnt make any changes to D2s since then

Gregja · Mar 15, 2015

I meant someone might have come up with a solution since then

thebiglad · Mar 15, 2015

Gregja said:
Back on topic what are the options for the discovery II is there an adjuster on the back of the binacle?

Perhaps if you were a little more specific in your request for information, you would get a better response? What are you trying to do?

Dave

Gregja · Mar 15, 2015

I'm trying to adjust my Speedo because I have 33" tyres after a lot of googling I found myself back here on this thread and seems as its the most recent it was worth resurrection. The op asks how to adjust the Speedo on the discovery 2 and apart from a vague post about software it soon descended into a discovery 1 Speedo thread. Info on that is all over the internet the only info I can find on the disco 2 talks about little boxes of tricks that yield dubious results. I was hoping that maybe someone might be able to shed more light on the subject and there for help other people in the future.

thebiglad · Mar 15, 2015

Gregja said:
I'm trying to adjust my Speedo because I have 33" tyres after a lot of googling I found myself back here on this thread and seems as its the most recent it was worth resurrection. The op asks how to adjust the Speedo on the discovery 2 and apart from a vague post about software it soon descended into a discovery 1 Speedo thread. Info on that is all over the internet the only info I can find on the disco 2 talks about little boxes of tricks that yield dubious results. I was hoping that maybe someone might be able to shed more light on the subject and there for help other people in the future.

OK I see where you are coming from now. It's been a little while since I did this, but I'm pretty sure that if you have a D2 dedicated diagnostic tool such as Nano Evo, Hawkeye or Lynx, you can access a compensation setting within the BCU.

Also bear in mind that the latter D1's had an electronic speedo, so changing the speed sensor in the transfer box would also apply.

sierrafery · Mar 15, 2015

thebiglad said:
... It's been a little while since I did this, but I'm pretty sure that if you have a D2 dedicated diagnostic tool such as Nano Evo, Hawkeye or Lynx, you can access a compensation setting within the BCU.

....

I'm sure you make some confusion Dave cos the BCU is not even involved in the speedo signal, the link is ABS sensors - SLABS ECU - speedometer, no correction with tester

thebiglad · Mar 15, 2015

Well there you go mate, the answer to my question is, obviously it too long

Speedo correction.

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