Rotary Car Club - View Single Post

Monkman33 · 01-23-2010, 01:02 PM

rx4ur7,

I do not wish to attempt to discount your experience, however, perhaps we are talking about two different applications regarding fuel starvation. One is under Naturally aspirated conditions, the other, under boost. Fuel starvation can easily lead to a detonation under boost due to the pump not being able to retain full pressure. As the pressure drops (which is not instantaneous in any way) there are multiple firing cycles in which the air/fuel ratio is at a dangerous lean condition. This is where the detonation happens. After the rail pressure drops below a certain point, the afr becomes too lean to even ignite, in which case you have a definite stumble/misfire scenario. I have watched the fuel pressure drop in a vehicle under fuel starvation conditions and heard definite pinging before it went to a straight missing.

Again, with complete regards to someone with much more actual racing experience than myself, I just feel we are looking at two different situations.

01-23-2010, 01:02 PM	#6
Monkman33 Still Building my FD Join Date: Jun 2009 Location: Pasco, WA Posts: 255 Rep Power: 16	rx4ur7, I do not wish to attempt to discount your experience, however, perhaps we are talking about two different applications regarding fuel starvation. One is under Naturally aspirated conditions, the other, under boost. Fuel starvation can easily lead to a detonation under boost due to the pump not being able to retain full pressure. As the pressure drops (which is not instantaneous in any way) there are multiple firing cycles in which the air/fuel ratio is at a dangerous lean condition. This is where the detonation happens. After the rail pressure drops below a certain point, the afr becomes too lean to even ignite, in which case you have a definite stumble/misfire scenario. I have watched the fuel pressure drop in a vehicle under fuel starvation conditions and heard definite pinging before it went to a straight missing. Again, with complete regards to someone with much more actual racing experience than myself, I just feel we are looking at two different situations. Last edited by Monkman33; 01-23-2010 at 01:08 PM.