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  #121  
Old August 4th, 2010, 02:35 PM
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I average around 24-25 mpg (US) with my 300tdi non-heavy but hardtop D90. Not sure which t-case gearing I have mostly due to not checking yet... Since its been really warm I've been running approx 20% SVO with 80% regular Diesel, in the winter I'll switch back to 100% diesel (proper biodiesel is few and far between in DC)
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  #122  
Old August 4th, 2010, 04:58 PM
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we were getting arround 25 mpg at 80mph in the puma tdci on long runs in the USA
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  #123  
Old August 4th, 2010, 05:19 PM
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I would leave the 1.4 in there. And why haven't we seen this vehicle at the NoVA happy hour???

Quote:
Originally Posted by Arjun View Post
Bumping an old thread for info:

Vehicle: 110 300Tdi on the heavy side (cage + winch + roof rack) with 33" tires and a 1" lift. Engine is bone stock.

Question: Is switching to a 1.22 transfer case from the stock 1.4 transfer case a wise idea for a vehicle that's used for local commuting as well as for long high way trips (usually >1000 mile round trips)?

Trying to improve mileage but not at the cost of running out of puff on inclines. Thanks in advance for any info.
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  #124  
Old August 5th, 2010, 09:23 AM
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Quote:
Originally Posted by Ren Ching View Post
I would leave the 1.4 in there. And why haven't we seen this vehicle at the NoVA happy hour???
The rig is getting a galvanized chassis swap and the seats are getting retrimmed - should get it back by October depending on the shop schedule. Will come out to the NoVA happy hour then.
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  #125  
Old August 8th, 2010, 11:46 AM
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Quote:
Originally Posted by Arjun View Post
Bumping an old thread for info:

Vehicle: 110 300Tdi on the heavy side (cage + winch + roof rack) with 33" tires and a 1" lift. Engine is bone stock.

Question: Is switching to a 1.22 transfer case from the stock 1.4 transfer case a wise idea for a vehicle that's used for local commuting as well as for long high way trips (usually >1000 mile round trips)?

Trying to improve mileage but not at the cost of running out of puff on inclines. Thanks in advance for any info.
As a 110 with 1.22 transfer box and 235/85's owner I'd say you'll run out of puff on big hills, you'll need to drop an extra gear.
I don't find 1st a problem to pull away and often use 2nd on the flat. The engine is standard.
Overall I think it was an improvement, It's even better on a 90.
I had endless trouble with a GKN overdrive though
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  #126  
Old August 8th, 2010, 03:29 PM
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As long as 1st is OK for pulling away and you can use 5th on the flats then you are not overgeared. Needed to shift down for a hill is not a reason. That is why you have all of the gears...
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  #127  
Old August 8th, 2010, 03:54 PM
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With my 2.8 and my R380, I find myself on hills in 5th gear losing steam down to 60mph, but I top out in 4th at 55 mph, so getting the 1.2 gear kit for my LT230 so I can top 4th at 65 sounds pretty right on target.
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  #128  
Old August 9th, 2010, 02:19 PM
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I just got 23.8mpg (refilled @ 418 miles because I was headed into an area with no stations @ night and the low fuel light hadn't come on yet). This in a 300 130 with rockware winch bumper loaded with people and gear where the pump fueling has been turned up. Economy in these trucks has a lot to do with driving style and rpms. If you are gentle and "lug" the engine and let the turbo do its thing you get max economy. If you rev the engine out @ every shift, and down shift on every grade rather than let the truck loose 5 mph you can blow through fuel. When I tow a heavy (8000 lbs+) load economy drops down into the mid to low teens depending on the terrain.

------ Follow up post added August 9th, 2010 02:22 PM ------

Quote:
Originally Posted by Overlander View Post
With my 2.8 and my R380, I find myself on hills in 5th gear losing steam down to 60mph, but I top out in 4th at 55 mph, so getting the 1.2 gear kit for my LT230 so I can top 4th at 65 sounds pretty right on target.
Mark just get a 1.2 tcase- they are everywhere cheap.
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  #129  
Old October 31st, 2010, 05:56 PM
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I think my fueling needs adjustment based on what I read here... The newly-planted 300TDI (R380, t/c from a Disco) gets about 17mpg after a few tanks of testing. It's a used motor with a rebuilt head + new timing belt and I have no idea how the fueling was/is set.

The driving is mixed freeway/local driving. I also find I'm unable to hold 65mph up hills in 4th or 5th, only on flats. Power doesn't feel good above 2200-2400rpm.. it's best from about 1600-2200. On hills I'm down to about 50mph with a good amount of throttle in 4th to keep it there.

I played with the pre-boost fuel adjustment to see about getting more power - I don't see any smoke in the daytime (side view mirror checking) but at night I can see in the car behind's headlights I am putting out a cloud when accelerating under load (eg starting off on a hill). Currently I am 1/2 turn clockwise from the position it was in (a factory-looking anti-tamper cap was on the adjustment screw so I suspect it was not altered from stock).

I also moved the wastegate control point from the turbo to the intake manifold fitting - this helped with power definitely. The fueling control is still at the turbo.

I can see the intercooler hoses expand when the turbo boosts so I should probably replace those, but that has nothing to do with my mileage.

I would be happy with low-mid 20's and jumping for joy if I could hit 26-27.
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  #130  
Old October 31st, 2010, 06:14 PM
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okay well sounds like your smoke is the normal amount, is it a power issue or a gearing issue, what tcase? what gears, and tire size? likely that is the problem. are you building boost?
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  #131  
Old October 31st, 2010, 08:14 PM
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Boost gauge says 14psi or so, looks good. I need to order an EGT.

It's a Disco TC case, not sure of gearing in it, but is there more than one type in a Discovery? A service shop put the wrong fluid in my stock D90 case and fried it & the only replacement I could find was a Disco case. They also denied wrongdoing (it took a while to fail) so hard to prove :-(

I have OME HD springs in front, MD in rear, so it sits a bit higher than factory but not a 'lift' kit. Tires are LT265-75R16. I have the factory roof rack as well. Everything is pretty stock-ish running gear-wise.

Power feels weak, and I know to expect less than the V8 but then at the same time I don't know how weak it's supposed to feel. I'd like to go up hills around LA w/o going down to 45mph. Highly doubt I could do 85mph but haven't tried yet.
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  #132  
Old October 31st, 2010, 10:29 PM
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Have you checked timing?

What is the exhaust and the intake comprised of?

Sounds like it does not what to rev up. It should pull hard to above 3000 rpm.
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  #133  
Old November 1st, 2010, 02:16 AM
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I have not checked timing - that's on the list.. probably take it to a shop for that as I've never messed with injection pumps/diesel fueling before.

Exhaust is 2.5" (pretty much the size of manifold outlet) to a magnaflow muffler and out. It's a free-flow muffler.

Intake is a 3" aftermarket setup, a generic cone-shaped reusable performance filter on the passenger side, around the back, and down to a 3" to 2.5" adapter onto the turbo. PCV is connected to the intake.

It never pulls hard... it pulls 'ok' up to about 2K then just feels 'flat' - like I'm revving up but no increase in thrust. And my mileage sucks @17mpg. Could this all be timing?
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  #134  
Old November 1st, 2010, 10:46 AM
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Somethings definately wrong if it goes flat @ 2k.

On my brothers truck he has the stock formed intake pipe that goes around behind the head and he has a simple k&n cone filter on that and the truck runs well-too well for my taste.

It could be timing-was your engine out of a truck that had an egr valve and cat ?
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  #135  
Old November 1st, 2010, 10:46 AM
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Timing is simple to check. See the manual. You need no special tools. 10 minute job. Do that first. If no luck, then check injector spray patterns and compression.

It should START to pull hard at 2000 rpm. Is there anyone else in the area with a TDI to compare to?
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  #136  
Old November 1st, 2010, 02:05 PM
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Check the diaphram under the top of the injection pump accessable after removing the 4 set screws that hold the cover on. If it's holed then there is a distinct lack of power at higher revs because the fueling isn't increased along with the boost. This happened to mine a long while ago
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  #137  
Old November 1st, 2010, 08:33 PM
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Quote:
On my brothers truck he has the stock formed intake pipe that goes around behind the head and he has a simple k&n cone filter on that and the truck runs well-too well for my taste.

It could be timing-was your engine out of a truck that had an egr valve and cat ?
The EGR was blocked off with a plate... not sure about originally. It had a TPS on it (which I removed) and had unused sensors in the intake manifold & head (the rear end of the intake, and another on the top driver's side center of the head) which are not connected to anything (not sure what they are... I removed the one on the intake to mount my boost gauge and relocate the wastegate control).

Quote:
Originally Posted by Red90 View Post
Timing is simple to check. See the manual. You need no special tools. 10 minute job. Do that first. If no luck, then check injector spray patterns and compression.

It should START to pull hard at 2000 rpm. Is there anyone else in the area with a TDI to compare to?
If that's the case then something is definitely amiss. I really need to coax it up to speed above 2100-2200... it just feels 'flat' and unresponsive as RPMs rise above that rpm.

Quote:
Check the diaphram under the top of the injection pump accessable after removing the 4 set screws that hold the cover on. If it's holed then there is a distinct lack of power at higher revs because the fueling isn't increased along with the boost
That would make sense... I'll check both the timing and this diaphram this weekend. Thanks for the suggestions - I'll post back what I find out.
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  #138  
Old April 25th, 2013, 07:13 PM
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According to my stats app (GasCubby):

Average 22.21 mpg (US) driving ~23k miles on my 300TDI 1998 Discovery (auto).
Average 24.26 mpg (US) driving ~22k miles on my 200TDI 1967 Series-IIA (R380).

NOTE: I actually have about 32k miles on the 200TDI but switched fuel apps (PalmOS -> iOS) and couldn't import the first 10k miles of data.
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  #139  
Old April 25th, 2013, 07:21 PM
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I get 17-18 MPG for mostly highway. 2.5 NA in a 110 SW, LT77, 1.6 xc, 235/85r16 tires
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  #140  
Old April 25th, 2013, 08:45 PM
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Quote:
Originally Posted by jaherring View Post
That would make sense... I'll check both the timing and this diaphram this weekend. Thanks for the suggestions - I'll post back what I find out.
Also make sure to check your throttle cable adjustments from your pedal to the injection pump. It could be as simple as your pedal hitting the floor before your IP throttle lever is maxed out.

To check, advance the throttle lever on the pump to max and hold it, then have someone floor the pedal from the driver seat and see if the cable pull the lever back down.
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