Remap box ?

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Grit Valve

Grit Valve

2000 4.6 Vouge
Posts
12,465
Location
Plaistow
This is fitted to ovalandrovers car spliced into the fip pump and also t piced into the map pipe that goes from the fuel map sensor we haven't a clue what this is is it a boost box???
Wammers Dave has plugged his nano Into live data for the mine is constant with the speedometer Davis however is not Consistent with the speedometer could you please explain where the reading come from is it the abs sensors or the gearbox sensors or the engine ecu????
D59F44B6-C209-493B-A385-40419016FEB4-4154-00000399862103AE_zpsc334563d.jpg
 
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Grit Valve said:
This is fitted to ovalandrovers car spliced into the fip pump and also t piced into the map pipe that goes from the fuel map sensor we haven't a clue what this is is it a boost box???
Wammers Dave has plugged his nano Into live data for the mine is constant with the speedometer Davis however is not Consistent with the speedometer could you please explain where the reading come from is it the abs sensors or the gearbox sensors or the engine ecu????
D59F44B6-C209-493B-A385-40419016FEB4-4154-00000399862103AE_zpsc334563d.jpg
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Speedo gets it's readings from ABS sensors. If that was what you were asking. Yes it's an early power box.
 
wammers said:
Speedo gets it's readings from ABS sensors. If that was what you were asking. Yes it's an early power box.
Click to expand...
ok thanks why does the nano speed road differ from the speedo as the doors increases the nano read a higher speed than on his cars speedo the speedo has been checked vai sat nav ect but in mine is perfect also he has checked the abs sensors via nano all seems well no recorded fault also is there a sensor on the gearbox that output shaft that reads the speed as well for gear changes ect ect ???
 
Grit Valve said:
ok thanks why does the nano speed road differ from the speedo as the doors increases the nano read a higher speed than on his cars speedo the speedo has been checked vai sat nav ect but in mine is perfect also he has checked the abs sensors via nano all seems well no recorded fault also is there a sensor on the gearbox that output shaft that reads the speed as well for gear changes ect ect ???
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Gearbox speed sensor has no input to speedo. Does he have different wheels on?
 
but how is the road speed reading on the Nanocom derived as it differs from the speedo reading?
The difference also increases with the speed of the vehicle.
at 30mph it is almost correct but at 40 mph the nanocom reads 44mph at 45 mph it reads 50 mph any thoughts on this?
The reading was checked with the speedo of the car and the speed reading on the sat nav which agreed with the speedometer.
This is the reading taken from the engine part of the Nanocom if the road speed reading done in the gearbox side of the Nanocom it reads correct,
 
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ovalandrover said:
but how is the road speed reading on the Nanocom derived as it differs from the speedo reading?
The difference also increases with the speed of the vehicle.
at 30mph it is almost correct but at 40 mph the nanocom reads 44mph at 45 mph it reads 50 mph any thoughts on this?
The reading was checked with the speedo of the car and the speed reading on the sat nav which agreed with the speedometer.
This is the reading taken from the engine part of the Nanocom if the road speed reading done in the gearbox side of the Nanocom it reads correct,
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Unless things have changed, the law allows speedo's to read +10% -0%, you just have a speedo at the top end of the permissable range. The one on my Xtrail was the same.
You can't always trust a SatNav for instantaneous speed readings.
Speedo reading, as Wammers said, is derived from the ABS sensors.
Just to add, the speedo is an analogue device driven by a digital source so potentially inaccurate, the Nanocom is taking the digital source and just converting it to a number.
 
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Datatek said:
Unless things have changed, the law allows speedo's to read +10% -0%, you just have a speedo at the top end of the permissable range. The one on my Xtrail was the same.
You can't always trust a SatNav for instantaneous speed readings.
Speedo reading, as Wammers said, is derived from the ABS sensors.
Click to expand...

Present law regarding speedo readings as far as i know is at an indicated 30 MPH the speed of the vehicle can be from 27 to 30 MPH. But it cannot be any greater than that. EU directive around 1999. Compliance by 2001 in the UK.For cars made before 2001 in the UK the law was plus or minus 10% at an indicated 30 MPH. That means at an indicated 30 MPH the vehicles speed could be anything between 27 and 33 MPH. That is why speed cameras in the UK are set at 30 MPH plus 10% plus 2 MPH. They should not flash until 35 MPH is exceeded in a 30 zone. Pro-rata for other speed zones. Sat nav speed readings can be way out. Unless you are driving down a long straight flat road.
 
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So why does it keep up with mine but not Daves surly there is an abs fault somewhere
My sat is more or less the same as speedo to so it can't be that far out
All the abs sensors were tested.
 
Grit Valve said:
So why does it keep up with mine but not Daves surly there is an abs fault somewhere
My sat is more or less the same as speedo to so it can't be that far out
All the abs sensors were tested.
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Tyre wear, tyre pressures, weight in vehicle will all alter the rolling radius. Don't really think it's worth getting over excited about.
 
How are you reading speed in Nanocom? Diagnostic mode? If so it has a setting for adjust the speed. A coefficient factor.
 
wammers said:
Present law regarding speedo readings as far as i know is at an indicated 30 MPH the speed of the vehicle can be from 27 to 30 MPH. But it cannot be any greater than that. EU directive around 1999. Compliance by 2001 in the UK.For cars made before 2001 in the UK the law was plus or minus 10% at an indicated 30 MPH. That means at an indicated 30 MPH the vehicles speed could be anything between 27 and 33 MPH. That is why speed cameras in the UK are set at 30 MPH plus 10% plus 2 MPH. They should not flash until 35 MPH is exceeded in a 30 zone. Pro-rata for other speed zones. Sat nav speed readings can be way out. Unless you are driving down a long straight flat road.
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Just been flashed for 1kmh over at 70Kmh:mad:
 
wammers said:
Tyre wear, tyre pressures, weight in vehicle will all alter the rolling radius. Don't really think it's worth getting over excited about.
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I'm not but he's been having trouble with delayed gear changes if the road speed is wrong wont that be a factor also I reckon the ps power box has something to do with it.
 
Grit Valve said:
I'm not but he's been having trouble with delayed gear changes if the road speed is wrong wont that be a factor also I reckon the ps power box has something to do with it.
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Gear shifts and the power box have no connection the the speedo reading, it's an analogue instrument and they are prone to inaccuracies.
 
Datatek said:
Gear shifts and the power box have no connection the the speedo reading, it's an analogue instrument and they are prone to inaccuracies.
Click to expand...
The speedo reading is accurate as its the same as the sat nav.
The road speed reading on the nanacomis the same up to 30 mph then starts to read faster than the speedo and as the speed increases the gap between the two gets greater so where does the nanacom read the road speed?
 
ovalandrover said:
The speedo reading is accurate as its the same as the sat nav.
The road speed reading on the nanacomis the same up to 30 mph then starts to read faster than the speedo and as the speed increases the gap between the two gets greater so where does the nanacom read the road speed?
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The Nanocom will read the road speed from the ABS, same as the speedo. If it reads correctly on one car but not the other, it can't be a Nanocom problem, maybe electrical noise that affects the more sensitive Nanocom but gets lost in conversion to analogue for the speedo.
 
So what Data and wammers are saying is that my speedo and sat nav are incorrect sand the nanacom readings is correct?
when reading the nanacom in gearbox diagnostic it agrees with my speedo but when reading road speed in the EDC is starts to read high. please explain the inconsistancy
 
Datatek said:
The Nanocom will read the road speed from the ABS, same as the speedo. If it reads correctly on one car but not the other, it can't be a Nanocom problem, maybe electrical noise that affects the more sensitive Nanocom but gets lost in conversion to analogue for the speedo.
Click to expand...

Out of intrest the first programmable electronic computer was analog and even to day the digital ones cannot do the job as fast as it can.
If you want more information on this type in colossus computer in google
 
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