NAS spec D90 tune resistor help required - Defender Source
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  #1  
Old May 2nd, 2005, 06:33 AM
UKlandyandy
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Andy
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NAS spec D90 tune resistor help required

Hi,

I've fitted a RaRo 3.9efi in my D90 and mounted the AFM/air filter across the bulkhead as per NAS spec vehicles. I've been told that because the flexible pipe between the AFM & plenum chamber is now alot longer than standard RaRo install I need to use a different ECU tune resistor.

Could someone tell me what is fitted to there NAS spec D90. I just need to know the colour of the wires on the resistor link and it's prob found next to the ECU. the resistor is in a clear heat shrink tube.

BTW, UK spec vehicles have green for non-cat and white for cats fitted.

Cheers,
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  #2  
Old May 2nd, 2005, 05:48 PM
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Black grey and Black white. It runs in and out of the ECU connecting to nothting else right?
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Old May 3rd, 2005, 06:23 AM
UKlandyandy
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Quote:
Originally Posted by Mike Hippert
Black grey and Black white. It runs in and out of the ECU connecting to nothting else right?
Hi Mike,

Will check the ECU plug/socket side colours tonight. The tune resistor will have solid coloured wires.

Cheers,
Andy
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Old May 3rd, 2005, 12:09 PM
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I wonder. Using the different size resistor changes the tuning to the different fuel map of other countries versions.

Power/Mileage gain to be had for cheap?

-Hans
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Old May 3rd, 2005, 12:12 PM
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Well I'll have to measure the resistance then all you need to do is swap it with a potentiometer (variable resistor) and you can tune it very easily.
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Old May 3rd, 2005, 04:05 PM
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Didn't you post the chart somewhere recently that showed the different nation resistances for the different tuning curves? maybe rig up a little box with a rotary switch to pop between them.

-Hans
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  #7  
Old May 4th, 2005, 05:04 AM
UKlandyandy
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Here is the tuning resistor chart :

Red wire, 180 Ohms, Australia, Rest of world.

Green wire, 470 Ohms, UK and Europe - Non Catalyst

Yellow wire, 910 Ohms, Saudi - Non Catalyst
Blue wire, 1800 Ohms - 4.2L setup, Non catalyst (I think & this is what I have been recommended to use)
White wire, 3900 Ohms, USA and Europe - Catalyst

Cheers,
Andy
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Old May 4th, 2005, 11:41 AM
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Thanks, I'll have to give this a further look and see what effect it has.
But don't expect anything too quick, my number of projects is far above the number of me to work on them.

-Hans
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  #9  
Old May 7th, 2005, 07:05 AM
UKlandyandy
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Hi,

Have made up a new tuning connector with a 1.8k ohm resistor. It does seem to have solved the slight hesitation just off idle and the throttle responce is much more crisp now. Still hunts a bit when standing in traffic for a time in drive but thats not to big an issue.

Cheers,

Andy Daws, '86 ex-MOD 90, V8 auto, 'Gon2Far 3Link'
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