Fuel: 4 Bar FPR vs 5 Bar FPR. How does it work?
#11
![Default](https://www.audiworld.com/forums/images/icons/icon1.gif)
I asked and was told that their testing was specifically with a 5 bar and that at different conditions, it does not flow exactly he same as a crushed 4 bar. I just decided to use a proper BOSCH 5 bar FPR to avoid any issues.
#12
![Default](https://www.audiworld.com/forums/images/icons/icon1.gif)
to his car. If the crushed 4 bar doesn't flow quite as much as a true 5 bar, he won't be able to run quite as much boost up top, but the car will still run perfectly fine.
#14
![Default](https://www.audiworld.com/forums/images/icons/icon1.gif)
The lambda loop - O2 & MAF sensors - will adjust for proper flow at cruise for stoichiometric A/F regardless of fuel pressure. Now at WOT I do not know what happens. I believe A/F is mapped to a particular injector size and MAF (injector size & FPR). But it is theoretically possible to calculate WOT A/F using the stoic MAF number but I don't know if the ECU does that. I think it reads the MAF at WOT.
Thread
Thread Starter
Forum
Replies
Last Post
JoeS4
S4 / RS4 (B5 Platform) Discussion
12
11-20-2007 03:08 PM
Pat
A4 (B5 Platform) Discussion
8
05-28-2007 06:39 AM
Dr. Back Crackin S4
S4 / RS4 (B5 Platform) Discussion
4
04-19-2005 07:16 AM
mmart6545
A4 (B5 Platform) Discussion
6
11-23-2003 07:32 AM
Raceinstructor
A4 (B5 Platform) Discussion
3
08-04-2003 02:05 PM