Reply With QuoteThe 300tdi is insanely efficient for most normal driving. That and the practicalities of the D1 shape and rear door are the only reasons we keep the POS.
We get ~8L/100 for normal driving and recently did 1000km towing a 5m boat at sub 10L/100.
ForumSage
Well this is interesting.
I've got the injection pump data for my 300tdi and it shows two things.
1. The engine VE is better than I thought.
2. The engine efficiency is worse than I thought at full power. Likely because of the original turbo.
Drive pressure at 4000rpm is ~17psi higher than boost. Over double.
3. The engine efficency at max torque is pretty much what I expected. But I don't know if my engine was officially the 265 or 280Nm version.
I'm re-running all my calcs on the new numbers. This will get interesting. Low rpm boost/power numbers won't change much, but high rpm will.
Swaggie
The 300tdi is insanely efficient for most normal driving. That and the practicalities of the D1 shape and rear door are the only reasons we keep the POS.
We get ~8L/100 for normal driving and recently did 1000km towing a 5m boat at sub 10L/100.
Moderator
My T250 is starting to get noisy so I was going to replace it with an MHI TD04-11G.
Unfortunately I've never been able to find a map for the -11G.
ForumSage
Yeah that's what my numbers are showing. Exceptionally efficient around 2000rpm and absolutely terrible around 4000rpm. Sliding scale in between.Originally Posted by isuzurover
LordRover
Subscriber300TDI will almost never see 4000 rpm so i dont see that as an issue, extra torque in the lower range would be good though.
MY08 TDV6 SE D3- permagrin ooh yeah
2004 Jayco Freedom tin tent
1998 Triumph Daytona T595
1974 VW Kombi bus
1958 Holden FC special sedan
ForumSage
That's my goal.
Anyone got a good max boost reading for an unmolested 300tdi at 1800rpm?
ForumSage
How about wheel measurements and turbine housing size?My T250 is starting to get noisy so I was going to replace it with an MHI TD04-11G.
Unfortunately I've never been able to find a map for the -11G.
By my calcs a TD04 turbine 6cm is about 10% bigger flow-wise than a Garrett GT2052 turbine from the TD5. T250 from the 300tdi is about 10% smaller flow-wise than the GT and about 20% smaller than a 6cm TD04.
5cm housing is on par with the GT2052.
Moderator
Yes, if I can average 11.5-11.8l/100km with the pump turned right up, 33" MT's, ladders on the roof, aerodynamics of a shed sitting on 110-115km/h (genuine) speed everywhere and tareing well over 2650kg, it's a stupidly efficient little engine.
Moderator
Unfortunately I don't have one.
That's the turbo MTQ/DTS use in their Tdi upgrade, and it's supposed to be that much more efficient than the T250 it isn't funny.
It appears to come on boost much, much earlier without losing anything up top.
JC has fitted their kits and likes them, says the driveability is vastly improved over the stock Garrett.
I think it was the same model as fitted to some Mitsubishi's.
ForumSage
The Td04 is similar turbine wheel features to the Garrett GT series. In fact damn near identical dimensions too. The T250 turbine looks like a paddle wheel in comparison.
They made big gains in turbine efficiency (almost 20%) which means extracting more power and more boost from less drive pressure. So you can run a dimensionally bigger turbine and still get the same boost down low but with far better performance up high.
There is ~15kw of un-neecessary pumping losses waiting to be released in the 300tdi at 4000rpm. It could be a ~100kw engine just with the same fuel, same boost but better turbo.
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