FI Duratec fuel requirements - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Forced Induction

General Forced Induction The place to chat about turbochargers, superchargers nitrous systems and custom engine fabrications.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 05-31-2012, 01:23 PM   #1
sporadic
Focus Addict
 
sporadic's Avatar
 
Join Date: Sep 2004
Fan#: 12724
Location: Fairmont, WV
What I Drive: 06 Sonic Blue ZX5 SES turbo

Posts: 1,290
Points 12,646, Level 73
Points: 12,646, Level: 73 Points: 12,646, Level: 73 Points: 12,646, Level: 73
Level Up 49% Completed
Level up: 49% Level up: 49% Level up: 49%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 61 sporadic Excellent Standing Member
Buy-Sell-Trade Rating: (12)
Question FI Duratec fuel requirements

I've asked around, used some calculators, but I can't get a straight answer.
I currently have 55# injectors, stock returnless fuel system and it works perfectly at 220whp (approximate).

At what point should a BAP be added? When should I make the jump to 80# injectors? How about ripping that out for a return style system?
The (max) goal of my next build is 25psi on a D20 with a GT2871R. That should be right around 400whp judging by dynos I have seen.
I've been told the 55# injectors and a BAP will be sufficient for 400whp. I've also seen where CFM is trying to sell a 300whp kit that includes 60# injectors and a BAP. Seems overkill if the previous statement is accurate.

Pardon my rambles. Lots on my mind planning the build.


__________________
2006 sonic blue zx5 GT2871r turbo.
sporadic is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-31-2012, 03:14 PM   #2
1turbofocus
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 22,202
Points 51,306, Level 100
Points: 51,306, Level: 100 Points: 51,306, Level: 100 Points: 51,306, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 31%
Activity: 31% Activity: 31% Activity: 31%
FF Reputation: 154 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (28)
I would add the 60lb and watch the fuel psi , if you see it dropping then add the BAP , My opinion is to add the return system about 350HP for safety

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email: hpdyno@aol.com
Phone: 704-249-3745
Site: focus-power.com

Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Old 05-31-2012, 03:31 PM   #3
sporadic
Focus Addict
 
sporadic's Avatar
 
Join Date: Sep 2004
Fan#: 12724
Location: Fairmont, WV
What I Drive: 06 Sonic Blue ZX5 SES turbo

Posts: 1,290
Points 12,646, Level 73
Points: 12,646, Level: 73 Points: 12,646, Level: 73 Points: 12,646, Level: 73
Level Up 49% Completed
Level up: 49% Level up: 49% Level up: 49%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 61 sporadic Excellent Standing Member
Buy-Sell-Trade Rating: (12)
Quote:
Originally Posted by 1turbofocus View Post
I would add the 60lb and watch the fuel psi , if you see it dropping then add the BAP , My opinion is to add the return system about 350HP for safety

Tom
What is the main benefits of going return style vs. just bigger injectors like 80lb?
Edit: OK so I have learned that general fuel control is simplified with a return style with less ramp-up in fueling.

At the moment I'm assuming the maximum output of the stock fuel pump is what is the limiting factor when we're talking about moving to a return-style system.
At some point the stock fuel pump just can't flow anymore, regardless of injector size. THAT is when I figure a return style fuel system is required.
__________________
2006 sonic blue zx5 GT2871r turbo.
sporadic is offline  
    Reply With Quote Quick reply to this message
Old 05-31-2012, 07:13 PM   #4
1turbofocus
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 22,202
Points 51,306, Level 100
Points: 51,306, Level: 100 Points: 51,306, Level: 100 Points: 51,306, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 31%
Activity: 31% Activity: 31% Activity: 31%
FF Reputation: 154 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (28)
You are correct , its the fuel pump not the Injectors

Idealy you want 1psi fuel psi fro each psi of boost with base fuel at 41psi , so 10psi boost you would want 51psi fuel , this is hard to do with the tuning software we have to use and the returnless fuel system , so what happens is as you go up in boost the injectors do x amount of dutycycle as the fuel psi falls off the dutycycle goes up to make up for the loss/lack of fuel psi to maintain A/F this is why it is best to always run larger injectors then needed because you burn up a lot of injector dutycycle just from not having enough fuel psi

With a return system you put a Vac line on the fuel psi regulator so every psi of boost adds 1 psi of fuel psi , makes life easier

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email: hpdyno@aol.com
Phone: 704-249-3745
Site: focus-power.com

Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Old 05-31-2012, 09:30 PM   #5
sporadic
Focus Addict
 
sporadic's Avatar
 
Join Date: Sep 2004
Fan#: 12724
Location: Fairmont, WV
What I Drive: 06 Sonic Blue ZX5 SES turbo

Posts: 1,290
Points 12,646, Level 73
Points: 12,646, Level: 73 Points: 12,646, Level: 73 Points: 12,646, Level: 73
Level Up 49% Completed
Level up: 49% Level up: 49% Level up: 49%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 61 sporadic Excellent Standing Member
Buy-Sell-Trade Rating: (12)
Quote:
Originally Posted by 1turbofocus View Post
You are correct , its the fuel pump not the Injectors

Idealy you want 1psi fuel psi fro each psi of boost with base fuel at 41psi , so 10psi boost you would want 51psi fuel , this is hard to do with the tuning software we have to use and the returnless fuel system , so what happens is as you go up in boost the injectors do x amount of dutycycle as the fuel psi falls off the dutycycle goes up to make up for the loss/lack of fuel psi to maintain A/F this is why it is best to always run larger injectors then needed because you burn up a lot of injector dutycycle just from not having enough fuel psi

With a return system you put a Vac line on the fuel psi regulator so every psi of boost adds 1 psi of fuel psi , makes life easier

Tom
That does sound simpler to tune for. Know where I could find a list of parts necessary to convert to a return system?
__________________
2006 sonic blue zx5 GT2871r turbo.
sporadic is offline  
    Reply With Quote Quick reply to this message
Old 05-31-2012, 09:52 PM   #6
1turbofocus
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 22,202
Points 51,306, Level 100
Points: 51,306, Level: 100 Points: 51,306, Level: 100 Points: 51,306, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 31%
Activity: 31% Activity: 31% Activity: 31%
FF Reputation: 154 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (28)
Fuel cell , lines , fuel psi regulator , fuel rail

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email: hpdyno@aol.com
Phone: 704-249-3745
Site: focus-power.com

Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:09 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat