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Motorhome Facts Forum Index » Tech / Mech Chat » Motorhome Performance » Turbocharger Effective Range
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 Turbocharger Effective Range
843298 Post Posted: Sat May 08, 2010 2:08 pm Thank this member for this postReply with quote Back To Top

Supermint1 Subscriber 15/05/2013 


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TURBOCHARGER EFFECTIVE RANGE: I have a 2.8TDI engine that is lugging along about 5500kg of motorhome. I have a turbocharger boost gauge fitted which indicates 21psi of boost at max output. I also have cruise control fitted and notice that when maximum boost is achieved there is still quite a bit of pedal left but no further power increase seems apparent after the tubo has peaked. The Fuel injection system is of the pre common rail hydromechanical type. My question is, is there any effect on fuel consumption if the accelerater is floored past the point of max boost? [align=left] Idea
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 Re: Turbocharger Effective Range
843357 Post Posted: Sat May 08, 2010 3:58 pm Thank this member for this postReply with quote Back To Top

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Supermint1 wrote:
TURBOCHARGER EFFECTIVE RANGE: I have a 2.8TDI engine that is lugging along about 5500kg of motorhome. I have a turbocharger boost gauge fitted which indicates 21psi of boost at max output. I also have cruise control fitted and notice that when maximum boost is achieved there is still quite a bit of pedal left but no further power increase seems apparent after the tubo has peaked. The Fuel injection system is of the pre common rail hydromechanical type. My question is, is there any effect on fuel consumption if the accelerater is floored past the point of max boost? [align=left] Idea


If you're using cruise control how do you know how much loud pedal it's demanding Question
In answer to your question, if no more power is available, increasing throttle will have no effect on fuel consumption Wink
Some systems produce max boost before max power in which case a variable geometry turbocharger or a blow off valve is required to prevent the cylinder head being blown off as the power increases Shocked Shocked

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 Turbocharger Effective Range
843363 Post Posted: Sat May 08, 2010 4:12 pm Thank this member for this postReply with quote Back To Top

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Thanks for that. As the cruise control is cable operated on the throttle I can feel the continuing downward movement of the pedal after max boost has been reached. Do I understand you to imply that further boost would utilise this remaining power at the top of the power curve?
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 Re: Turbocharger Effective Range
843416 Post Posted: Sat May 08, 2010 5:33 pm Thank this member for this postReply with quote Back To Top

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Supermint1 wrote:
Thanks for that. As the cruise control is cable operated on the throttle I can feel the continuing downward movement of the pedal after max boost has been reached. Do I understand you to imply that further boost would utilise this remaining power at the top of the power curve?

My expertise is with very large diesel engines (>100,000 hp Wink )so I don't pretend to be a great expert on automotive engines but the principles are the same Smile
You can't go increasing the boost pressure above the design value because it is likely to result in unacceptably pressure in the cylinders Evil or Very Mad

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 TURBOCHARGER EFFECTIVE RANGE
843431 Post Posted: Sat May 08, 2010 5:57 pm Thank this member for this postReply with quote Back To Top

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I take your point. I guess the difficulty in judging the merits of any power upgrade is finding out what the design pressure is and what is safe. I read on a Fiat engine forum that the existing Fiat 2.8 JTD engines are tuned to 122 ps in some European countries and up to 135 in others

Many thanks for your input
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