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Old 19-10-11, 10:27 PM   #1
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Default Interesting!

Just been looking further in to my 407's maps to squeeze a little more out of it now I've got no EGR, I also need to keep a few things in check.

I did notice, for those who are wondering as far as optimal driving goes:-

At any given torque request (pedal position) the absolute LEAST amount of fuel is injected at precisely 2000 RPM. It increases only slightly either side of that from 1500-3000RPM before it does become uneconomical.

I guess that kinda blows the shift @ or before 2000rpm out of the window, it's best to sit at 2000rpm, and change back down to it.

http://philstorage.info/pictures/IQ.png

Phil
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Old 19-10-11, 10:46 PM   #2
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Interesting indeed. Do we have any such info on 2.0 HDI?
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Old 20-10-11, 06:59 AM   #3
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Probably why 'normal' driving in the 2.0HDI is about 2,000rpm (5th for 50-60mph and 6th for 70-80mph)

Good to hear.... been driving as economical as I can
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Old 20-10-11, 03:31 PM   #4
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Where are you at with the EGR now , did you unblank it? what mpg you getting round town?
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Old 20-10-11, 04:30 PM   #5
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Quote:
Originally Posted by bettyswollocks View Post
Where are you at with the EGR now , did you unblank it? what mpg you getting round town?
I'm still blanked off, I can't post decent results at the moment for fuel consumption because 2 of 4 injector seals have been leaking for an undetermined amount of time which will skew them.

My current average is 48.7 over 400 miles, with no motorway driving, just town, I don't drive as efficient as I could.

But, I'm pretty sure I'm consuming more than that though. I also need to determine what influence the increased measured airflow via the MAF has on the Injection Quantity, it may be that the MAF limits fuel injection based on airflow as opposed to increase it beyond what the IQ Map states.

Previously I was worried about overboost due to EGR removal, 2200mbar constitutes an overboost condition on these, I'm currently peaking around 1900mbar so I'm safe, thankfully.

Phil
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Old 20-10-11, 04:43 PM   #6
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Any fault codes?
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Old 20-10-11, 05:37 PM   #7
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Any fault codes?
No codes at all.
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Old 20-10-11, 05:39 PM   #8
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Quote:
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My current average is 48.7 over 400 miles, with no motorway driving, just town, I don't drive as efficient as I could.
What mpg were you getting before the DPF removal, remap and EGR blanking??
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Old 20-10-11, 05:40 PM   #9
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I`m getting 40 to 44 round town , but thats stop start every 5 mins , would like to blank of egr to see if it helps mpg.
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Old 26-10-11, 03:26 PM   #10
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I`m getting 40 to 44 round town , but thats stop start every 5 mins , would like to blank of egr to see if it helps mpg.
It does, and it doesn't.

If you're always on a motorway then it does, anything other than that and it's pretty dire! And without a substantial remap to correct issues with massive airflow and turbo boost I don't recommend it.

In fact, I've just fitted a new EGR Valve back to mine as it just isn't worth the hassle in the long run, fault codes or not!

Phil
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