Fuel gauge help

Adam37tr · Joined: 05 Oct 2008 Posts: 101

Hi Guys

Still trying to get my fuel level on my Dash2 from my DL1
Ive found a wiring diagram for my car (mitsi evo) but the diagram seems to show 2 senders??

Any help would be very appreciated

Not sure how to post pics Sad

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Adam37tr · Joined: 05 Oct 2008 Posts: 101

http://www.lancerregister.com/reg_cardetails.php?carid=460&action=edit#/

theres a pic in here

Adam37tr · Joined: 05 Oct 2008 Posts: 101

Anyone??

you can see the wiring diagram in the link above , left hand pic

Cheers Adam

osborni · Joined: 07 Dec 2007 Posts: 473 Location: USA, Michigan

If you are replacing your stock gauges with the Dash2....

You can wire them both in series or in parallel, you just need to make sure that your pull up network will not pull too much current.

It probably uses two senders to average out fuel level variation.

Regardless, you will probably need a really long refresh rate and a slow rate of change.
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BMW 2000 M Coupe

Adam37tr · Joined: 05 Oct 2008 Posts: 101

So would you connect across them as a 2wire with a 10k resistor
then log and see how it goes?

cheers Adam

Support · Joined: 31 Oct 2005 Posts: 1369

For reference at the bottom of this page is a table listing which resistors to use.
http://www.race-technology.com/wiki/index.php/HowDoI/ConnectA1Or2WireSensor
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Posted by the Race Technology support team

Adam37tr · Joined: 05 Oct 2008 Posts: 101

Support

Does the above sound right with the drawing from my link

Thanks Adam

Support · Joined: 31 Oct 2005 Posts: 1369

Can you measure the resistance across the sensors with them disconnected? treat the two sensors as one when doing this. That way we can calculate the pull up resistor needed.
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Posted by the Race Technology support team

Adam37tr · Joined: 05 Oct 2008 Posts: 101

Seem to have 6.1 ohms across the 2 senders

Thats with around about 3/4 to full tank

So would pressume a 10k resistor to get amps down to 120mAmp is that correct

Cheers Adam

Support · Joined: 31 Oct 2005 Posts: 1369

6.1 ohms seems very low for 3/4 full tank. Would you possibly measure the resistance with an empty tank?

Using a 10,000 ohm resistor would result in hardly any voltage swing.
A 10,000 ohm pull up resistor would be suitable for a resistance between a few thousand ohms up to tens of thousands of ohms.
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Posted by the Race Technology support team

Support · Joined: 31 Oct 2005 Posts: 1369

6.1 ohms seems very low for 3/4 full tank. Would you possibly measure the resistance with an empty tank?

Using a 10,000 ohm resistor would result in hardly any voltage swing.
A 10,000 ohm pull up resistor would be suitable for a resistance between a few thousand ohms up to tens of thousands of ohms.
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Posted by the Race Technology support team

osborni · Joined: 07 Dec 2007 Posts: 473 Location: USA, Michigan

Adam37tr · Joined: 05 Oct 2008 Posts: 101

osborni · Joined: 07 Dec 2007 Posts: 473 Location: USA, Michigan

I dunno, but most fuel senders are in the 0-240 Ohm or so range. Full to empty or empty to full......
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BMW 2000 M Coupe

Adam37tr · Joined: 05 Oct 2008 Posts: 101

Think I will give the 1k resistor a try gets some logs and see from there

Any more tips Question

Cheers Adam