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Author Topic: Modifying a 2.7T file *FOR* a returnless fuel system  (Read 4083 times)
edgy
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« on: June 06, 2016, 03:46:49 PM »

What do I need to look at adjusting in order to modify a 2.7T file for a returnless fuel system?
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2002 S4 full stg 3
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pablo53
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« Reply #1 on: June 06, 2016, 05:48:27 PM »

What do I need to look at adjusting in order to modify a 2.7T file for a returnless fuel system?

In regards to ECU tuning?   Nothing.... or am I misunderstanding the question?

You'd just need the parts kit (pump, filter/regulator, fuel pressure sensor, manifold pressure sensor, and PCM).

Beware, many of the less expensive kits (like the LS1 kits) don't have the ability to either:

1. Sense and respond to boost pressure and increase fuel pressure on a 1:1 ratio w boost, or
2. Reach an overall operating pressure at least equal to desired fuel system pressure plus your max boost.   Say, 58 psi fuel system pressure (~4 bar) plus 22 psi peak boost requires 80 psi system pressure in order to maintain 58 psi differential.

Some of those kits get pretty costly.... like over a grand. 
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nyet
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« Reply #2 on: June 06, 2016, 05:54:56 PM »

What do I need to look at adjusting in order to modify a 2.7T file for a returnless fuel system?

You need a fuel system that doesn't need the ECU to adjust injector pw depending on fuel pressure.

Good luck.
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matchew
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« Reply #3 on: June 06, 2016, 06:27:10 PM »

FRLFSDP
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edgy
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« Reply #4 on: June 07, 2016, 07:52:25 AM »

FRLFSDP

Ah ha! Thank you matchew - I was having a very hard time remembering what it was.
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2002 S4 full stg 3
2001 S4 stg 2
2001 TT 225 stg 2
1988 80q 4.2
2005 A4 (the wife's)
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