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[Paul M]

With regards to speedo accurate, the Senator is just as accurate as my 2000 X plate Omega.

Driving back from picking it up, i had my Sat Nav on. The GPS recorded a speed of 65mph... Digi Dash said 70!

Usual 10% add on ....

Come to think of it those BMW 840's must be rare now, not seen one in years!

My point exactly... 10% isn't much at 30 MPH, but if you're doing 140 MPH your speedo could be reading up to 154! I had a digital diagnostics thing in the Subaru that reads out the values directly from the ECU in real time, now even that isn't calibrated but it doesn't have the deliberate "over-estimate" built into the dash speedo and also doesn't have the analogue component of most speedos. It was quite surprising how out the actual speedo is once you get into three figures.

BTW The 840 was always pretty rare, only around 2000 came to the UK. Of which only 50ish were 6-speeders. 57 RHD 6-speed 840Ci were produced worldwide, I have the only one with this exterior/interior colour combo.

[Paul M]

.......It had a calibrated speedo, so happy to dial out the standard 10% speedo error/boast present in standard cars.....

Paul, I agree with what you have said as regards capabilities but I would, however, debate a little as regards the speedo.

If you re-read my quote above, you will see it was acheived on a car with a calibrated speedo.  

As you say 'Ye canny change the laws o' physics, Captin' but just because the cars are old, does not infer that the means and method to ensure that a speedo is accurately calibrated to less than 1% error across the full working range in 1990 (when it was less than a year old, remember) should be any different now, all other things being equal such as tyre size, rolling radius etc.

IRS of Nottingham have been doing this for a while now - 50 years is quoted on their website - clicky here  

That's all well and good for cop cars that will be run and maintained within strict rules - such as exact tyre size, and tyre pressure. One that's been out of service for years and has god knows what brand, size and pressure tyres is going to be somewhat less accurate. I'm sure the cops have to regularly check their calibration using marked miles or whatever, very much doubt the calibration is done once and assumed good for 50 years, even if they seldom need adjustment.

On a similar note, I assume motorway patrol cars run higher tyre pressures than standard cars to take into account the potential for prolonged high-speed driving? If this is the case (and the speedo is calibrated as such) then it will cause an over-read if normal pressures are run.

[hotel21]

.......It had a calibrated speedo, so happy to dial out the standard 10% speedo error/boast present in standard cars.....

Paul, I agree with what you have said as regards capabilities but I would, however, debate a little as regards the speedo.

If you re-read my quote above, you will see it was acheived on a car with a calibrated speedo.  

As you say 'Ye canny change the laws o' physics, Captin' but just because the cars are old, does not infer that the means and method to ensure that a speedo is accurately calibrated to less than 1% error across the full working range in 1990 (when it was less than a year old, remember) should be any different now, all other things being equal such as tyre size, rolling radius etc.

IRS of Nottingham have been doing this for a while now - 50 years is quoted on their website - clicky here  

That's all well and good for cop cars that will be run and maintained within strict rules - such as exact tyre size, and tyre pressure. One that's been out of service for years and has god knows what brand, size and pressure tyres is going to be somewhat less accurate. I'm sure the cops have to regularly check their calibration using marked miles or whatever, very much doubt the calibration is done once and assumed good for 50 years, even if they seldom need adjustment.

On a similar note, I assume motorway patrol cars run higher tyre pressures than standard cars to take into account the potential for prolonged high-speed driving? If this is the case (and the speedo is calibrated as such) then it will cause an over-read if normal pressures are run.

The point being made as regards speed was that, when less than a year old and with an accurate speedo the car achieved 164 mph with 500 revs to go until redline 5th.  I personally am not talking about doing the same thing in a 16 year old car today.

B

[TheBoy]

With regards to speedo accurate, the Senator is just as accurate as my 2000 X plate Omega.

Driving back from picking it up, i had my Sat Nav on. The GPS recorded a speed of 65mph... Digi Dash said 70!

Usual 10% add on ....

Come to think of it those BMW 840's must be rare now, not seen one in years!

My point exactly... 10% isn't much at 30 MPH, but if you're doing 140 MPH your speedo could be reading up to 154! I had a digital diagnostics thing in the Subaru that reads out the values directly from the ECU in real time, now even that isn't calibrated but it doesn't have the deliberate "over-estimate" built into the dash speedo and also doesn't have the analogue component of most speedos. It was quite surprising how out the actual speedo is once you get into three figures.

BTW The 840 was always pretty rare, only around 2000 came to the UK. Of which only 50ish were 6-speeders. 57 RHD 6-speed 840Ci were produced worldwide, I have the only one with this exterior/interior colour combo.

Tyre sizes/wear apart, the Omega speedos (testable via Tech2) are generally fairly accurate up to 140 (doesn't test above this)

[Auto Addict]

When I had my Sennie (auto of course), it used p**s all over Toyota Supras.

[MaxV6]

I'll attest to seeing IRS calibrated speedo's in manual sennie B's read in excess of 150 regularly...  i've never seen a calibrated one over 160 though...  but I have  on an uncalibrated one....

I also saw Sennie A's over 150 , also with calibrated clocks....

I'm told that the calibration is done to be accurate for the vehicle in question as it is normally, when in use, with tyres etc up to a nominal operating temperature. (as achieved at 70MPH for 90 minutes)

(notice i said SEEN, so I'm not admitting to owt else .....  I cannot obviously condone the breaking for our nations traffic laws for anything other than official emergency purposes. )

[Paul M]

When I had my Sennie (auto of course), it used p**s all over Toyota Supras.

Obviously not the turbo variant then (which I suspect may actually be the more common model in the UK, as with Imprezas)... those will destroy any Senator or Omega even pulling off in 2nd gear

And that's just the stock variant, some mild tuning on those will see big gains, this is where turbo cars really shine over NA cars which are a bugger to tune.

[Del Boy]

When I had my Sennie (auto of course), it used p**s all over Toyota Supras.

My 12V version didn't but the 24V did  

[Del Boy]

With regards to speedo accurate, the Senator is just as accurate as my 2000 X plate Omega.

Driving back from picking it up, i had my Sat Nav on. The GPS recorded a speed of 65mph... Digi Dash said 70!

Usual 10% add on ....

Come to think of it those BMW 840's must be rare now, not seen one in years!

My point exactly... 10% isn't much at 30 MPH, but if you're doing 140 MPH your speedo could be reading up to 154! I had a digital diagnostics thing in the Subaru that reads out the values directly from the ECU in real time, now even that isn't calibrated but it doesn't have the deliberate "over-estimate" built into the dash speedo and also doesn't have the analogue component of most speedos. It was quite surprising how out the actual speedo is once you get into three figures.

BTW The 840 was always pretty rare, only around 2000 came to the UK. Of which only 50ish were 6-speeders. 57 RHD 6-speed 840Ci were produced worldwide, I have the only one with this exterior/interior colour combo.

Sounds a lovely car paul m8 always seen them as lovely cars

[Marks DTM Calib]

The Senator analogue speedo accuracy is not great (digital might be better!)....it was generally reading a good 10mph high......at 155mph on the autobahn the satnav showed a speed of 140mph......but then satnav by the nature of how it calculates speed tends to read slightly low....