Thread: 2004 D2 V8 Fuel economy

I only run premium as well, to much pinging otherwise, and only 98, not 95 unless i have no choice. I also run 32s though so that could make a fair difference.

Hmmmm 635 out of a tank, now that would be a nice change, maybe mines running a little rich, do you guys get alot of black sooty crap around the exhaust tip? no smoke just black crap building up, i asked Alto newcastle about i several times while it was under warranty and they keep telling me nothing was wrong.

Originally Posted by PhilipA

2004 is 9.35:1CR instead of 8.13:1 in 2002 , so he is using 95-98 octane.

This should be worth about 10% in economy, The car would run max advance and pull back timing via Knock sensors..
The 8.13 would never get to use the knock sensors.

Regards Philip A

I have a 2004 Disco and the motor is a 8.13:1

Originally Posted by cal415

I only run premium as well, to much pinging otherwise, and only 98, not 95 unless i have no choice. I also run 32s though so that could make a fair difference.

Hmmmm 635 out of a tank, now that would be a nice change, maybe mines running a little rich, do you guys get alot of black sooty crap around the exhaust tip? no smoke just black crap building up, i asked Alto newcastle about i several times while it was under warranty and they keep telling me nothing was wrong.

Mine used to ping unless I ran premium fuel. I was told by Range Rov that you should definately be able to run standard unleaded in the Disco and if it pings then there is a fault in th O2 sensor. So I had the O2 sensor replaced under warranty and it now runs fine on standard unleaded.

I have a 2004 Disco and the motor is a 8.13:1

__________________
You are the unlucky one!
Only reason I know is that guy at work got one and was told premium fuel blah blah. I believe it was a running change on the last few.

By the way all Thor run at stoichiometric all the time (ie 14.7:1 on petrol), so its unlikely that anything can be done to significantly improve economy. But that may be why they are more prone to pinking than older engines which run richer.
For example my 3.9 with a Thor manifold, and rudimentary electronic advance via Unichip, and about 8.6-8.8:1 compression never pings on ULP.

If your 8.13:1 car is pinking on ULP then something may be wrong. Although I think we have been through all this at length. That is interesting about the O2 sensors as they are necessary for the Motronic to stay at 14.7:1. Or maybe bad knock sensors. Many (most?) O2 sensors should be changed at 100K, but nobody does!

Regards Philip A

My 87 dunga Rangie was pinging a bit but I had to pull the dizzy out and re-calibrate it (couldn't retard the timing, bloody thermostat housing fouled on the vac advance and it wouldn't turn back any more).

Now that was a ****ed up job to do

Trav

Anyone know what the o2 sensors are worth? is there one on each side?

Only 1 of them and they are worth a lot but dont know exact price.