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  #1  
Old March 13th, 2016, 11:56 AM
Roverlab
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TDi fuel consumption

Not complaining about 20 mpg as its better than my gasoline powered Rovers, but had a random thought: I have seen posts suggesting fuel economy in the mid 20's was easy to attain. I'm running 32" tires and a 1.2 tcase. I find 5th gear isnt very useful on a even slight grades. So, could that combo of tire and hi ratio actually have an effect on mileage? Thoughts?
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  #2  
Old March 13th, 2016, 12:01 PM
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IME, the change from 1.4 to 1.2 had no real effect on mileage. It is mostly to do with how your engine is setup and how you drive. That is really bad mileage so something is not right with the engine, IMO.

What gearbox ratios are you using?

Timing, boost and spray pattern would be where I would look.
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Old March 13th, 2016, 12:54 PM
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The best I have ever gotten with a 300tdi is 19mpg. I have had 4 (3 of them where in d90s and one in a 110), so I guess they where all set up wrong? I often challenge the idea that they actually get the mpg numbers that I have read about. I suppose in a bone stock truck with road tires they may get that, but I have never actually observed it. None of my trucks where bone stock. All had lift kits and bigger tires. Now I did have a td5 (in a Defender 110 crew cab) and it did get 28mpg all the time. It had a lift and bigger tires.
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Old March 13th, 2016, 01:07 PM
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Quote:
Originally Posted by lrnasd90 View Post
The best I have ever gotten with a 300tdi is 19mpg. I have had 4 (3 of them where in d90s and one in a 110), so I guess they where all set up wrong? I often challenge the idea that they actually get the mpg numbers that I have read about. I suppose in a bone stock truck with road tires they may get that, but I have never actually observed it. None of my trucks where bone stock. All had lift kits and bigger tires. Now I did have a td5 (in a Defender 110 crew cab) and it did get 28mpg all the time. It had a lift and bigger tires.
what altitude are you at?
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Old March 13th, 2016, 01:16 PM
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Beaumont TX, sea level +or- a couple of feet
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  #6  
Old March 13th, 2016, 01:30 PM
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I get 18-19 mpg in my 110 200Tdi, 1.4 LT230, 33x12.5-15 mud grips on steelies. Tith cage, 2 spares, winch and ARB bumper = a heavy pig.
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Old March 13th, 2016, 01:43 PM
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After having driven a Tdi for almost 2 years and documenting a couple of highway trips, I have found that the truth varies.

One trip I would get 22-24mpg.
Another I would get 19-20.
Similar style driving and loads.

Then I found out that most Tdi fuel mileage turns out to be like mythical fishing stories....

Nobody really ever got 28mpg...if they did I want to see it proven.


.
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Old March 13th, 2016, 01:54 PM
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John, my thinking was that with the taller tire and 1.2, I was on the throttle more to maintain momentum/speed, therefore potentially affecting economy.
She doesn't smoke other than a puff on start up cold.
It's making 13 psi; hoping to get to the EGT probe this week.
Also, very flat throttle response on start-up. I'll run in low range until I get to an intersection 1/4 mile away, then it's down hill and usually good enough after that.
The gear box is 56A0205685 and the last digit maybe B?
I will admit to turning the clockspring 4 clicks CCW. Improved the low end considerably, but boost was lower and power was flat at the top end. Without the EGT, I didn't leave it there, only because I'm still learning!
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Old March 13th, 2016, 01:56 PM
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I think we are at about 32 ft above sea level. I double my height with an over pass!

------ Follow up post added March 13th, 2016 01:04 PM ------

I only ever got 28 mpg with my td5, never with the 300 tdis. It was bone stock except a 1" lift and 32" tires. And it was usually empty of pretty much everything except myself. I never left gear in it. The bed of the truck stayed empty most of the time. I didn't even have a spare tire with me most of the time. No ac, no roof rack, stock front bumper, no rear bumper. I could drive up and down all the over passes around here in 5th gear with no problems, always had to down shift to 4th in my 300's on the same over passes. Easily cruise at 70 mph. In retrospect it was a really nice setup.
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  #10  
Old March 13th, 2016, 02:35 PM
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With a 56a gearbox you will be better off with a 1.4 in overall drive ability. Not sure it will help mileage though.

My mileage is carefully measured. 22 is my worst. 25 is more normal. No real differ we've from 32 to 34" tires.

If you have a lift or a roof rack it will be worse. More height equals more drag.
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Old March 13th, 2016, 02:42 PM
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With a 56a gearbox you will be better off with a 1.4 in overall drive ability. Not sure it will help mileage though.

My mileage is carefully measured. 22 is my worst. 25 is more normal. No real differ we've from 32 to 34" tires.

If you have a lift or a roof rack it will be worse. More height equals more drag.
I wonder if there's a cetane difference between Canadian and US diesel causing the variation.
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Old March 13th, 2016, 02:42 PM
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Quote:
Originally Posted by Nomar View Post

Then I found out that most Tdi fuel mileage turns out to be like mythical fishing stories....

Nobody really ever got 28mpg...if they did I want to see it proven.


.
I got 28+ with a SL35TI. 3.5 liter mazda turbo diesel in a 110 with a 1.0 tcase on flatland at 65 mph with regular luggage for a wedding and one other person. Best I got in a 200tdi 90 was 26 regularly.

200 and 300tdi are both overrated. They are standard Land Rover, so compatible and easy to install into any Rover product; however, they suck. For reference, I had no problem holding 65 on a 6% grade with the 1.0 tcase and 255/85r16 tires in my 110 from sea level to about 3k'. A Rover tdi would have been a lot worse than how my setup did.

I think 28mpg figures come from a guy going on the highway then filling up to the extremely vague point where the tank is "full". On the older 90s/110s a pump will cutoff at different points each time. If you have an inaccurate fill up you'll never know how much fuel you're actually using. Mid twenties is accurate for them. High teens is probably closer if you hit hills and are one of those guys who revs high and stays in low gears longer.
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Old March 13th, 2016, 02:52 PM
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I wonder if there's a cetane difference between Canadian and US diesel causing the variation.
Quite possible. In Canada, I was getting 26-28 mpg. In the states I got about 24. This with the HS2.8 in a Disco 1 with OME lift, winch, and rack. Oh and close to stock tires. 245/70-16. I've since gone back to 235/70-16.
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Old March 13th, 2016, 03:01 PM
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In both my d90 and classic, i have never gotten better than 17-21mpg. Could improve if you shift sooner, just past lugging her out, and basically drive sensibly, which i never do. In charlotte traffic its always a race...
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Old March 13th, 2016, 03:21 PM
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I wonder if there's a cetane difference between Canadian and US diesel causing the variation.
No. It is the same. I use a vet and booster though. I don't think it affects mileage.
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Old March 13th, 2016, 03:33 PM
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Did anyone catch what he said about his tweak to his fuel pump?

John, are you running with any kind of mods to your fuel pump?
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  #17  
Old March 13th, 2016, 03:42 PM
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Did anyone catch what he said about his tweak to his fuel pump? John, are you running with any kind of mods to your fuel pump?
Yes. Fueling is turned up to highest safe level. I don't think that affect mileage either as it give more power. The power needed to move does not change it just lets you go faster if you want.

Optimal timing. More boost. Good spray patterns are the biggest impacts on efficiency.

I suspect what hurts most people is increasing wind drag with lifts, racks, tents and so on.
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Old March 13th, 2016, 03:58 PM
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In in the tech videos and articles I've read, tuning the fuel for better power includes turning the star wheel gear clockwise, up to 90 degrees. He said he turned it CCW.

People report that they get better MPG by tuning up. The logic behind this would be that they drive the same, but with more power, therefore the engine is not working as hard for as long to get to cruise speed. I've experienced this in the Disco with a gauge set up to show live fuel econ.

If he truly turned it CCW, he may actually have lowered the power output of the engine, resulting in his report of weak performance, and higher fuel usage as a way of trying to compensate for the weaker performance.
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  #19  
Old March 13th, 2016, 04:03 PM
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You are mixing up turning the fueling pin with the starwheel. The starwheel does not affect maximum fueling.
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Old March 13th, 2016, 04:12 PM
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I thought the star wheel gear is what he meant when he said he turned the "clockspring".
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