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Vq25Dd Tune Tips

jimnz

By jimnz,
in General Maintenance

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jimnz Rookie

jimnz

Posted
Posted

hi all,

ive reciently brought a 2002 stagea.

im looking to firstly get the fuel consumption down and secondly get the power up.

i thought there would be more grunt available from the 2.5 V6 and 16.3 liters per 100 in town seems too heavy.

(im getting 9.5 on the open rd) ;-)

ive just done the plugs and fuel filter and service - no change.

the mech put it on the dianogstic and says the o2 senson is due.

research shows the main reason will be the o2 sensor.

also possible fixes:

new temp sensor

high tyre pressures

98 octane (ive been thinking 91 would be cheaper)

id like you views on the above and any other tips

does it have 1,2 or 4 o2 sensors?

where to buy?

http://o2sensors.com.au/search/application?makeID=29&modelID=2575&engineID=3037 $200 each

http://www.amayama.com/search/?q=22690AL600 varyies on oem or copys..

are non nissan parts ok?

thanks for your input.

jim

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scotty nm35 Grand Master

scotty nm35

Posted
Posted

You won't get much of a response in this section, head into the Stagea forum and ask your questions there Jim.

Amayama would be the place for parts, genuine Nissan and cheap. I doubt replacing the o2 sensors will help much, these are big thirsty 2T wagons and you have the smallest engine available. Perhaps you can do a test on them before swapping to see if they are slow to react?

The first thing I would be doing is removing as much of the intake as possible and cleaning all the carbon out of it from the egr valve.(I hate these valves) You will see the swirl valves in the lower intake then, and you can decide if you want to remove them, or simply hold them open? They are there to help improve chamber swirl and lean running on the open road though. You rarely get power without losing economy on the factory ecu especially.

91 octane would cause detonation (pinking), the factory ecu would detect this and drop out timing causing a soggy feeling on acceleration. You have a very lean burning high compression engine so it needs all the help it can get, especially now it is building up inside with carbon deposits. I would be using 95 as a minimum.

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