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View Full Version : Stupid question but I have to ask anyway


the Dragon
January 19th, 2008, 12:30 PM
Commanded fuel when in open loop Normal (Cold Open Loop).

When these values are DECREASED, will the mixture be leaned or richened up?

Thanks!



Christopher
joecar
January 19th, 2008, 01:58 PM
Chris,

If you're displaying that table in AFR units, then decreasing the values will richen the mixture.

If you're displaying in EQ units, then increasing the values will richen the mixture (EQ = STOICH / AFR).

Cheers
Joe
:cheers:

PS: it would be stupid to not ask a question and be forever wondering what the answer is, so please don't feel that it's a stupid question... ;)
dfe1
January 19th, 2008, 07:48 PM
If lost bolts were displayed in EQ units, would a higher value equal more lost bolts, or fewer?
Tordne
January 19th, 2008, 08:47 PM
Given that higher EQ Units makes you richer you could afford to buy more bolts :muahaha:
dfe1
January 20th, 2008, 06:24 AM
Given that higher EQ Units makes you richer you could afford to buy more bolts :muahaha: That being the case, if the EQ ratio for lost bolts were 1.14, the lost bolt count would be richer-- ie more lost bolts-- than if it were 1.00. On the other hand, if you were to measure lost bolts in lambda, 1.14 would represent a leaner count, or fewer lost bolts.

The reason I posted the lost bolt question in the first place was to point out that a number, given without reference, is a source of confusion, not data. I think the different meaning of identical lambda and EQ values is a case in point. Both equate 1.0 with stoichiometry, (nominally 14.7:1 AFR) but values move in opposite directions to indicate richer or leaner air/fuel ratios. Many times, (as with some stand-alone control systems) numbers are stated without clear reference to either lambda or EQ. If you're not familiar with these measurement conventions, it's often difficult to make sense of things. A value of 1.14 can indicate an AFR richer or leaner than 14.7:1 depending on whether you're talking lambda or EQ ratio.
joecar
January 20th, 2008, 09:54 AM
Very good point... any quantity must have some kind of units associated with it. :cheers:

Also note that an increase in lost bolts actually means you're missing bolts... :D
Biggsy
January 20th, 2008, 10:02 AM
Very good point... any quantity must have some kind of units associated with it. :cheers:

Also note that an increase in lost bolts actually means you're missing bolts... :D

But, YOU are in charge of lost bolts, therefor an increase of lost bolts means you gain more!
Does that mean you are the one taking them??