Intake, Header, HFC, CBE = Too Lean?

Vegitto-kun · 03-24-2010, 06:09 AM

what is running lean? I probably know it in other terms but does it mean that the engine isn't pumping enough fuel and air in the cilinders?

Modshack · 03-24-2010, 07:49 AM

Quote:

Originally Posted by Vegitto-kun

what is running lean? I probably know it in other terms but does it mean that the engine isn't pumping enough fuel and air in the cilinders?

Ideal Air/Fuel ratios for a N/A car are in the 12.5 to 12.8:1 range. Too lean would be in the mid 13:1 range.

Turbo cars like to run richer in the mid 11's as more fuel is used to cool the combustion and keep detonation under boost controlled.

F.I. Inc. · 03-24-2010, 09:51 AM

Quote:

Originally Posted by Modshack

Ideal Air/Fuel ratios for a N/A car are in the 12.5 to 12.8:1 range. Too lean would be in the mid 13:1 range.

Turbo cars like to run richer in the mid 11's as more fuel is used to cool the combustion and keep detonation under boost controlled.

I totally agree. On my TT mustang @ 25PSI we are at 1000 RWH! My A/F throughout the entire curve is 11:4-11:7. Keep in mind, I am also running unleaded 109 octance VP race fuel in order to achieve this.

Tony

semtex · 03-24-2010, 07:54 AM

Quote:

Originally Posted by Vegitto-kun

what is running lean? I probably know it in other terms but does it mean that the engine isn't pumping enough fuel and air in the cilinders?

In simple terms -- too much air, not enough fuel. Running rich would be the opposite.

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03-24-2010, 06:09 AM	#1 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 264	what is running lean? I probably know it in other terms but does it mean that the engine isn't pumping enough fuel and air in the cilinders?