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Old 06-24-2004, 03:37   #1 (permalink)
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air temp compensation on fuel maps question

As the air temp increases do I richen or lean off the fuel maps. I think as air gets less dense as the air temp increases then less air molecules in the air then less fuel is required to be injected. Am I right???
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Old 06-24-2004, 06:18   #2 (permalink)
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Re: air temp compensation on fuel maps question

Quote:
Originally Posted by turbotrana
As the air temp increases do I richen or lean off the fuel maps. I think as air gets less dense as the air temp increases then less air molecules in the air then less fuel is required to be injected. Am I right???
Leaning out the Fuel could cause possible detonation condtion. Rather, it may need to have timing retarded to scale. or add fuel.
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Old 06-24-2004, 09:09   #3 (permalink)
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Re: air temp compensation on fuel maps question

The timing/temp relationship is generally to retard as air temp goes up on hot summer days, but what I am trying to clarify is how temp extremes from 10deg to 40deg+ air intake affect the fuel ratio.
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Old 06-28-2004, 03:47   #4 (permalink)
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Re: air temp compensation on fuel maps question

Isnt the hotter the intake temp the more likely it is to pre-ignite? On a 40C day the intake temp could be atleast double that.
So you add more fuel to prevent that?
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Old 06-28-2004, 06:27   #5 (permalink)
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Re: air temp compensation on fuel maps question

Hi Martin,
Rang EMS today. I was right, for fuel map air temp compensation you need to increase fuel slightly as temp goes down (martin this is assuming that the A/F ratio is correct at 40 deg. In that instance you quote you would retard timing to prevent detonation and you would do this in the air temp compensation of the ignition map i.e decrease ign timing as air temp goes up. This is a good feature to use) cause the air is more dense with more oxygen, hence more fuel can go in. This temp comp thing is not really that important as it is really for very very fine tuning.
By the way Martin, the turbo setup that I'm doing is nearly ready, just waiting on the wastegates from turbonetics as they are completely out of stock of racegates. When finished will send pic.
Your EMS8860 will have a Autotune function soon. I'm actually getting the software to test but it should be available in the next few months. This is a huge step for a EMS in this price range. Stay tuned (pardon the pun)
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