Fuel pump & HP
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
damn
what happens if you push more than that power with a stock pump? im planning a mild motor rebuild next year which will put me at close to 400rwhp. im guessing i wont ever see that without changing fuel pumps? ( and injectors as well i assume)
what happens if you push more than that power with a stock pump? im planning a mild motor rebuild next year which will put me at close to 400rwhp. im guessing i wont ever see that without changing fuel pumps? ( and injectors as well i assume)
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Our fuel pump delivers constant volume of fuel to the system.
When the pre-set pressure limit has been reached at the fuel rail, the regulator opens and returns excess flow back to the tank.
As the injectors draw more of this flow, due to increased air flow from mods, eventually all the flow from the puimp is needed for the injectors and the sustem is at maximum capacity.
If the engine trys to draw more fuel pressure must drop and the engine will start to go lean.
As your fuel system approaches this limit a scan tool will show the O2 sensor readings dropping off at WOT. This will first occur when the engine is near the peak VE on the power curve.
So, you should be able to detect if your fuel system is hitting it's limit on fuel delivery capability by keeping track of WOT O2 sensor readings, even with a narrow band O2 sensor.
When the pre-set pressure limit has been reached at the fuel rail, the regulator opens and returns excess flow back to the tank.
As the injectors draw more of this flow, due to increased air flow from mods, eventually all the flow from the puimp is needed for the injectors and the sustem is at maximum capacity.
If the engine trys to draw more fuel pressure must drop and the engine will start to go lean.
As your fuel system approaches this limit a scan tool will show the O2 sensor readings dropping off at WOT. This will first occur when the engine is near the peak VE on the power curve.
So, you should be able to detect if your fuel system is hitting it's limit on fuel delivery capability by keeping track of WOT O2 sensor readings, even with a narrow band O2 sensor.
Advanced
Joined: Dec 2001
Posts: 51
Likes: 0
From: Nashville TN
Originally Posted by 65Z01
If the engine trys to draw more fuel pressure must drop and the engine will start to go lean.
As your fuel system approaches this limit a scan tool will show the O2 sensor readings dropping off at WOT. This will first occur when the engine is near the peak VE on the power curve.
So, you should be able to detect if your fuel system is hitting it's limit on fuel delivery capability by keeping track of WOT O2 sensor readings, even with a narrow band O2 sensor.
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