Fueling Upgrade needed again?

Chuck-S4 · 11-29-2005, 08:39 AM

I was discussing this with Mike Moore over email..

I currently have 42# Greentops @ 4BAR with a 88mm ID MAF Housing, Walbro fuelpump... So a total of 510cc/min for each injector. I'm at 120%+ Duty Cycle, 02 around 0.88.. The car is fast (Sub 3sec FATS at this temperature) already but it seems it could do even better.

The suggested route would be using 60# Siemens @ 2.7BAR... so if my calculations are ok, it would translate into 597cc/min : ((3 bar/2.7 bar)^(0.5)) * 60# * 10.5 ; is that right?

I'm far from being a fueling expert but is this setup sufficient? Anybody is running on this? what about idle?

2000s4biturbo::Uli · 11-29-2005, 08:42 AM

thats what i run.

you might need more fuel if you are going for crazy numbers though.

BUFFALONOGAROpebFATS · 11-29-2005, 08:55 AM

about whether or not the duty cycle is truly accurate, but for my money i would run on the safe side and swap out the green tops for the siemens. 120% is just too much for my paranoid brain

Captain Matt, I be · 11-29-2005, 09:15 AM

quite to 60lbs

not sure how optimal the spray patterns on those are though.

Chuck-S4 · 11-29-2005, 09:16 AM

The car is producing crazy numbers for sure, the port/polish job helping... And I can boost more with the K24 that's the worst of it. I can't imagine the car when it will be 0F outside. 2.5 sec FATS are possible.

Chuck-S4 · 11-29-2005, 09:17 AM

mbox · 11-29-2005, 09:21 AM

Not quite as nice as the RS4's but better than the greentops. No clue about the siemans.

DAP@EPL · 11-29-2005, 09:22 AM

See if the car is actually running lean and don't just rely on what the ECU is trying to do.

-Dave Pramanik

Captain Matt, I be · 11-29-2005, 09:24 AM

mbox · 11-29-2005, 09:31 AM

11-29-2005, 08:39 AM	#1
Chuck-S4 AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 1,690	Fueling Upgrade needed again? I was discussing this with Mike Moore over email.. I currently have 42# Greentops @ 4BAR with a 88mm ID MAF Housing, Walbro fuelpump... So a total of 510cc/min for each injector. I'm at 120%+ Duty Cycle, 02 around 0.88.. The car is fast (Sub 3sec FATS at this temperature) already but it seems it could do even better. The suggested route would be using 60# Siemens @ 2.7BAR... so if my calculations are ok, it would translate into 597cc/min : ((3 bar/2.7 bar)^(0.5)) * 60# * 10.5 ; is that right? I'm far from being a fueling expert but is this setup sufficient? Anybody is running on this? what about idle? __________________

11-29-2005, 08:42 AM	#2
2000s4biturbo::Uli Elder Member Garage is empty, add now Join Date: Nov 2003 Posts: 14,238	why not 42# + 5 bar? thats what i run. you might need more fuel if you are going for crazy numbers though. __________________ MY BABIES a.k.a. CARS you want the best for your car? tell him i sent you. FATS database NOT stock ;^P nogaro 6mt my00, casa 6mt my01.5

11-29-2005, 08:55 AM	#3
BUFFALONOGAROpebFATS Member Garage is empty, add now Join Date: Feb 2002 Posts: 3,304	well you will need more than you have now i would say. i know it has been discussed here about whether or not the duty cycle is truly accurate, but for my money i would run on the safe side and swap out the green tops for the siemens. 120% is just too much for my paranoid brain __________________ CNPE founding member

11-29-2005, 09:15 AM	#4
Captain Matt, I be AudiWorld Expert Garage is empty, add now Join Date: Oct 2001 Posts: 32,081	thats what i'd go with as well - delphi makes a 44lb and a 50lb injector if you dont want to go quite to 60lbs not sure how optimal the spray patterns on those are though. __________________ Support Innovation for the B5 Platform - www.autospeedperformance.com www.vastperformance.com B5 S4 Forum Cliff's Notes B5 S4 RNS-E Nav+ Installation

11-29-2005, 09:16 AM	#5
Chuck-S4 AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 1,690	120% for me also is just plain silly... The car is producing crazy numbers for sure, the port/polish job helping... And I can boost more with the K24 that's the worst of it. I can't imagine the car when it will be 0F outside. 2.5 sec FATS are possible. __________________

11-29-2005, 09:17 AM	#6
Chuck-S4 AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 1,690	Yep... Nobody talks about spray patterns... :( This is an important factor as well. __________________

11-29-2005, 09:21 AM	#7
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	Delphi has a decent spray pattern... Not quite as nice as the RS4's but better than the greentops. No clue about the siemans.

11-29-2005, 09:22 AM	#8
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	Wideband is your friend. See if the car is actually running lean and don't just rely on what the ECU is trying to do. -Dave Pramanik __________________

11-29-2005, 09:24 AM	#9
Captain Matt, I be AudiWorld Expert Garage is empty, add now Join Date: Oct 2001 Posts: 32,081	IIRC the spray patterns on the 44# and 50# delphis are different than the pattern on the 42# ones __________________ Support Innovation for the B5 Platform - www.autospeedperformance.com www.vastperformance.com B5 S4 Forum Cliff's Notes B5 S4 RNS-E Nav+ Installation

11-29-2005, 09:31 AM	#10
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	so you installing your K04's er what??

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