Lowest beneficial IAT for maximum timing advance ?

tscdennab · 04-06-2011, 06:40 PM

Hi,

We all want low IATs on the N54 engine, but is there a "lowest IAT" under which there is no benefit as far as ignition timing is concerned ? I mean, if at let's say 20 Celsius the ECU provides max timing, is there a point of further lowering that IAT via methanol/water injection ? (I am not talking about the octane increasing properties of the methanol, but just the cooling properties).

mithiral67 · 04-06-2011, 07:08 PM

at absolute zero?

Forcefed3 · 04-06-2011, 07:19 PM

Quote:

Originally Posted by mithiral67

at absolute zero?

+1 there is no way you could the incoming charge too cold.

mithiral67 · 04-06-2011, 07:23 PM

Honestly, the colder the better is true up until the temp changes from combustion to intake temps could cause metal fatigue.

The more o2 in the chamber the better.

04-06-2011, 06:40 PM	#1
tscdennab Banned 151 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	Lowest beneficial IAT for maximum timing advance ? Hi, We all want low IATs on the N54 engine, but is there a "lowest IAT" under which there is no benefit as far as ignition timing is concerned ? I mean, if at let's say 20 Celsius the ECU provides max timing, is there a point of further lowering that IAT via methanol/water injection ? (I am not talking about the octane increasing properties of the methanol, but just the cooling properties).
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04-06-2011, 07:08 PM	#2
mithiral67 That guy 117 Rep 5,740 Posts Drives: 2015 Cayman GTS Join Date: Jun 2008 Location: Chicago Burbs iTrader: (4) Garage List 2015 Porsche Cayman ... [0.00]	at absolute zero?
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04-06-2011, 07:23 PM	#4
mithiral67 That guy 117 Rep 5,740 Posts Drives: 2015 Cayman GTS Join Date: Jun 2008 Location: Chicago Burbs iTrader: (4) Garage List 2015 Porsche Cayman ... [0.00]	Honestly, the colder the better is true up until the temp changes from combustion to intake temps could cause metal fatigue. The more o2 in the chamber the better.
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