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Thread: Td5. Power loss on HOT days?!

  1. 30th January 2014, 02:02 PM #31
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    OffTrack
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    Most of the temp compensation seems to for low rather than high temperatures for coolant, fuel temp, and ambient temps. Most of the performance hit will be due to reduced air density caused by temp increase. A 20degree increase in ambient temp reduces density by about 10% and this will result in a similar drop in fuel injected. If the Nanocom actually showed air box temperatures on EU3 engines you'd see that in hot weather these can be 10+ degrees higher than ambient. It's quite feasible that you'll see a 15-20% drop in power purely as a result of air temperature on 40+ days. You'll have to blame the ideal gas laws for that "problem"....
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  2. 31st January 2014, 09:08 AM #32
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    armandnel
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    Would having a snorkel aid to lower intake air temperature (engine bay heat),
    or is the standard intake configuration far enough away from taking in warm air in the engine bay!? (Wow what a sentence...had to read that again lol)
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  3. 31st January 2014, 09:13 AM #33
    Dougal
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    A bigger intercooler will help the most.
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  4. 31st January 2014, 11:16 PM #34
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    armandnel
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    Quote Originally Posted by Dougal View Post
    A bigger intercooler will help the most.
    The D2a has a larger inter cooler out of the factory than its predecessor by 10-20% (correct me if I'm wrong)

    I'm not so sure what the solution. Might need aftermarket inter cooler.
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  5. 1st February 2014, 06:17 AM #35
    Dougal
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    Quote Originally Posted by armandnel View Post
    The D2a has a larger inter cooler out of the factory than its predecessor by 10-20% (correct me if I'm wrong)

    I'm not so sure what the solution. Might need aftermarket inter cooler.
    The best intercooler is the biggest one you can physically fit. I don't have a D2, but the aftermarket items look like a good compromise between ease of installation and bigger size.
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  6. 2nd February 2014, 02:32 AM #36
    Furka
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    Quote Originally Posted by Dougal View Post
    The best intercooler is the biggest one you can physically fit. I don't have a D2, but the aftermarket items look like a good compromise between ease of installation and bigger size.
    Yes and no. Too big intercoolers with standard Turbos, make lag. That is my experience.
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  7. 2nd February 2014, 05:27 AM #37
    Dougal
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    Quote Originally Posted by Furka View Post
    Yes and no. Too big intercoolers with standard Turbos, make lag. That is my experience.
    On what vehicle turbo combinations?
    Pressure waves in air travel at ~300 m/s and diesel intercoolers are already full of air. My 2.0tdi car has a factory full-width and full height front mount intercooler. Bigger than any TD5 on a smaller engine and lag isn't an issue.
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  8. 3rd February 2014, 01:32 AM #38
    Furka
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    Quote Originally Posted by Dougal View Post
    On what vehicle turbo combinations?
    Pressure waves in air travel at ~300 m/s and diesel intercoolers are already full of air. My 2.0tdi car has a factory full-width and full height front mount intercooler. Bigger than any TD5 on a smaller engine and lag isn't an issue.
    On a TD5, for example, it is an issue. With the standard turbo, on a manual Disco, I feel the lag, not big but its is here, specially from 1.000 to 1.500 rpm when the turbo pressure is low. Note the intercoolers for auto D2 are not as big as the manual UE specs.
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  9. 19th February 2014, 11:04 AM #39
    td5inside
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    Hi,

    Just a quick post to say " dont forget the viscous fan". When working at full speed it puts the power of the car down 20%.

    Regards,
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  10. 19th February 2014, 09:54 PM #40
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    I have noticed as well that the td5 when running in hot temps it's sluggish, I have a VL turbo and the computer system on that regulates power output by the ambient temperature... Maybe that's what the td5 computer is doing as well...

    Also if the waste gate on the turbo isn't sealing the exhaust gases properly this can increase spool up time...

    Sent from my iPhone using Forum Runner
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