300tdi MPH/ Revs question - Defender Source
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  #1  
Old January 5th, 2011, 09:09 AM
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300tdi MPH/ Revs question

What are you guys pushing, revs wise, at 65 mph? My math says it should be somewhere around 2600 rpm (stock 235/85's, 1.4 TCase, and 3.56 gears). Is that too much for the motor, in your opinion? Should it be lower to make the motor happier?
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  #2  
Old January 5th, 2011, 09:46 AM
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I run 75 all the time at over 3K, it's fine. The 300 is a revvy little Diesel.
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Old January 5th, 2011, 09:51 AM
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So, where is peak power/ torque on a stock 300tdi?
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Old January 5th, 2011, 10:03 AM
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I don't recall exactly but Max HP is at around 4000 RPM and the Torque comes on about 1800. Redline is like 4500?
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Old January 5th, 2011, 10:08 AM
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Are the 200 numbers at all similar?
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Old January 5th, 2011, 10:11 AM
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Awesome. Thanks for the information. I havent seen one with a tach and finding a dyno graph has been tough. Trying to play with gearing combinations on paper but dont want to move it out of peak efficiency.
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Old January 5th, 2011, 10:16 AM
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This numbers are about right for the 2.8 as well with a 1.4 tcase. The 2.8 factory power graph puts peak above where I ever want to go (over 4k). I'm way under fueled right now, so my limiters are egt's, fueling and noise
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Old January 5th, 2011, 10:20 AM
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Just use the calculator on the Ashcroft website.
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Old January 5th, 2011, 10:21 AM
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I used the one on grimmjeeper. Its really good but peak power numbers are what I am interested in. Trying to see what the increase in tire size and gearing would do to the motor.
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Old January 5th, 2011, 10:37 AM
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From playing with the Ashcroft calculator, as long as you are punching in tire sizes under 33in, the numbers are probably pretty close to actual, save for rolling resistance, wind resistance etc. But there are other variables, EGT, tuning, cooling system, etc. that also should be considered.
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Old January 5th, 2011, 10:52 AM
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Don't have a tach in the current truck but have been driving tdi defenders for 3+ years daily.
With 33's you can run 75-80 mph but I have found that pushing past 65 kills my fuel economy-ie it drops into the teens. This was true on both the 110 and 130. Working the torque curve instead of hp is where the engine is happiest- but egt has to be watched.
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Old January 5th, 2011, 11:19 AM
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Quote:
Originally Posted by crown14 View Post
From playing with the Ashcroft calculator, as long as you are punching in tire sizes under 33in, the numbers are probably pretty close to actual, save for rolling resistance, wind resistance etc. But there are other variables, EGT, tuning, cooling system, etc. that also should be considered.
Doing the math using a stock, 300tdi Defender with 1.4 TCase, 235/85 R16 tires and 3.56 gears, 65 mph makes for about 2641 rpm in top. That was the benchmark for me. I know that this is a turbo dependent motor for power so I wanted to make sure that the gearing and tire combo (255/85) wasnt going to combine to make the motor unhappy. Looking at a 65 or 70 mph cruiser at around the stock rpm number of about 2700 rpm. Just wanted to make sure that I wasnt going to be pushing it too hard but if the redline is up there at 4500 rpm, I would be pretty safe it looks. As for tune, I would be keeping it relatively stock. Maybe slight altering of the fueling for some extra power but not going to go too nuts. Im looking for economy out of it and want to keep the mileage out of the teens.
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Old January 5th, 2011, 11:37 AM
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Quote:
Originally Posted by 130Tdi View Post
Don't have a tach in the current truck but have been driving tdi defenders for 3+ years daily.
With 33's you can run 75-80 mph but I have found that pushing past 65 kills my fuel economy-ie it drops into the teens. This was true on both the 110 and 130. Working the torque curve instead of hp is where the engine is happiest- but egt has to be watched.

On the way back from MAR I got the best mileage ever (I was caravanning at 65 the whole way behing Jarek and otheres) I got 24mpg (1 tank from VA to North Jersey...) When I run 72 mph on long runs I am getting about 20..
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  #14  
Old January 5th, 2011, 05:37 PM
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Hi Jarrod on my 300 tdi auto running a ZF HP22 1.4 trans & stock diffs I am making 2500 rpm off my vdo tacho
fuel economy is 25mpg day to day commuting and 28mpg on a 600 mile run to france and back averaging 60 - 65 mpg

regards all
Gren
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