Alibro · May 23, 2024

Hi guys
I'm trying to calibrate the rev counter in my EV converted Freelander 1 so would like to know what rpm you guys see at 50mph, 60mph, and 70mph in 5th gear.
Even better would be if you can confirm the speed from Waze or Google maps as wheel/tyre size effects the speedo. I currently have smaller tyres than standard so my speedo is very optimistic.

I don't need perfection as it is a mile out now but as near as possible would be great.
Any help appreciated

hd3 · May 24, 2024

fl1/td4 :

.. 225/65/17's ..

1750 rpm .. in 5th gear .. 45 mph
1963 rpm .. in 5th gear .. 50 mph
2350 rpm .. in 5th gear .. 60 mph
2700 rpm .. in 5th gear .. 70 mph
2972 rpm .. in 5th gear .. 76 mph

...............................................................
with standard tyres .. am fairly sure 70mph in 5th were 3000 rpm .. as near as ..
i guess you could add 300 rpm to the list ... to get rpm/5th in standard tyre size.
.
btw .. with the 65's .. speedo read spot on with gps readouts ..
.

andyfreelandy · May 24, 2024

Hello, hello, hello. Got some questions about the 76mph m'lad !!!!

Alibro · May 24, 2024

hd3 said:
fl1/td4 :

.. 225/65/17's ..

1750 rpm .. in 5th gear .. 45 mph
1963 rpm .. in 5th gear .. 50 mph
2350 rpm .. in 5th gear .. 60 mph
2700 rpm .. in 5th gear .. 70 mph
2972 rpm .. in 5th gear .. 76 mph

...............................................................
with standard tyres .. am fairly sure 70mph in 5th were 3000 rpm .. as near as ..
i guess you could add 300 rpm to the list ... to get rpm/5th in standard tyre size.
.
btw .. with the 65's .. speedo read spot on with gps readouts ..
.

Thanks mate, much appreciated.
As always with me perfection is not an option but we still try.

pwood999 · May 25, 2024

I thought the later TD4 uses ABS sensors for speed, and sends the CAN messages to the instruments ECU for the display ? If it does, then inaccuracy must be the calibration in the instruments themselves ?

Can you read the CAN messages & compare to a GPS speedo app ?

Alibro · May 25, 2024

pwood999 said:
I thought the later TD4 uses ABS sensors for speed, and sends the CAN messages to the instruments ECU for the display ? If it does, then inaccuracy must be the calibration in the instruments themselves ?

Can you read the CAN messages & compare to a GPS speedo app ?

The speedo work fine and you are right about it getting speed from the ABS sensors, it reads optimistic because I have the Nissan Leaf wheels and tyres on it. They just happened to fit and had good tyres so I figured I would use them for a while until I get new tyres on the Freelander wheels.

It is the rev counter that I am trying to sort as it reads around 3k rpm at 45mph in top gear. The rev counter is being fed CAN by my VCU firmware which is getting it from the inverter but it's going wrong somewhere in the Arduino sketch so I'm trying to figure out where the issue is.

Shabe · 2024-11-25T21:11:59+0000

Alibro said:
The speedo work fine and you are right about it getting speed from the ABS sensors, it reads optimistic because I have the Nissan Leaf wheels and tyres on it. They just happened to fit and had good tyres so I figured I would use them for a while until I get new tyres on the Freelander wheels.

It is the rev counter that I am trying to sort as it reads around 3k rpm at 45mph in top gear. The rev counter is being fed CAN by my VCU firmware which is getting it from the inverter but it's going wrong somewhere in the Arduino sketch so I'm trying to figure out where the issue is.

Did you connect motor to gearbox? And is the car 4wd or 2wd?

Nodge68 · 2024-11-25T21:31:38+0000

Shabe said:
Did you connect motor to gearbox? And is the car 4wd or 2wd?

The build thread is here.

Freelander 1 - Freelander EV

Nodge and I have been musing about the idea of a Freelander EV. We agree it would make a great base for an EV conversion project due it's relatively light weight, the way the boot cubby could be extended to the fuel tank position and it's height allowing loads of space for batteries below the...

www.landyzone.co.uk

Shabe · 2024-11-25T22:25:18+0000

Nodge68 said:
The build thread is here.

Freelander 1 - Freelander EV

Nodge and I have been musing about the idea of a Freelander EV. We agree it would make a great base for an EV conversion project due it's relatively light weight, the way the boot cubby could be extended to the fuel tank position and it's height allowing loads of space for batteries below the...

www.landyzone.co.uk

Thanks

Alibro · 2024-11-25T23:22:29+0000

Nodge68 said:
The build thread is here.

Freelander 1 - Freelander EV

Nodge and I have been musing about the idea of a Freelander EV. We agree it would make a great base for an EV conversion project due it's relatively light weight, the way the boot cubby could be extended to the fuel tank position and it's height allowing loads of space for batteries below the...

www.landyzone.co.uk

That's mean Nodge! It'll take him days to read that lot.

Nodge and me designed and made a connection from the motor to the gearbox so the transmission is completely standard 4WD apart from no clutch. It works great until I try to drive off without putting it in gear which happened today.
I was towing a trailer with a tonne of stones and stupidly forgot to put it in first (which I only use when towing) so when I went to drive away it revved to silly rpm's. I probably took years off the synchro mesh by pushing the gear stick towards first to try and slow the rpm enough to get it into gear.

BTW I have since fitted the proper Freelander wheels and new tyres so the speedo reads perfect now.

Shabe · 2024-11-26T03:34:58+0000

Alibro said:
That's mean Nodge! It'll take him days to read that lot.
Nodge and me designed and made a connection from the motor to the gearbox so the transmission is completely standard 4WD apart from no clutch. It works great until I try to drive off without putting it in gear which happened today.
I was towing a trailer with a tonne of stones and stupidly forgot to put it in first (which I only use when towing) so when I went to drive away it revved to silly rpm's. I probably took years off the synchro mesh by pushing the gear stick towards first to try and slow the rpm enough to get it into gear.

BTW I have since fitted the proper Freelander wheels and new tyres so the speedo reads perfect now.

Thats alright, might check the videos anyways.

dont know much about syncromesh, hope it turned out fine tho

Alibro · 2024-11-26T07:56:03+0000

Shabe said:
Thats alright, might check the videos anyways.

dont know much about syncromesh, hope it turned out fine tho

LOL, It seems to be OK.
TBH I don't know much about syncromesh either except that it helps match the speed of the gears to the speed of the engine (or motor) in a manual gearbox. If it goes wrong it is hard to change gear without a crunch and is probably the reason I can change gears without a clutch.

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Freelander 1 - Freelander EV

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Freelander 1 - Freelander EV

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