Hey guys, gotta few questions before i upgrade fuel. I do have some links and they are all EBay. First off i have been looking at walbro 255 fuel pumps and it seems there are alot of different ones for different prices. Is walbro the brand or is it a type of pump? Heres a link to the one i was looking at, anygood? http://cgi.ebay.com/ebaymotors/Walbr...QQcmdZViewItem
Wow man, all that info made me feel good except for the fpr part. I found the one you were talking about, it looks really nice and im sure its high quality, but its $225!!? A little steep for my pockets. Just wondering why would i need to turn pressure down?
When you upgrade your fuel pump, you will over-run your fpr, thus increasing pressure. This will cause your base fuel pressure to be eratic and it will cause it not to rise 1:1 with boost. Non-stable base fuel pressure will cause weird idle situations, stumbling and what not. This is why you need to be able to reduce pressure.
O ok, i get it. So when i upgrade fuel pump and injectors, i will need to lower it down to still stock pressure, although it will be higher volume which means more fuel right? Is it the N/A guys who use afpr to add more fuel for more power then?
I recommend FIC injectors and an Aeromotive AFPR on any DSM.
AFPR = Adjustable fuel pressure
There are plenty of reasons why you would want to raise or lower your base fuel pressure. In your case, you have a 2G FWD, which will not have large fuel pressure overrun problems. The 2G AWD cars are the ones who suffer greatly when installing a Walbro 255HP intank fuel pump because of the design of the plastic saddle fuel tank.
1G's and 2G FWD's have very little FPR overrun even with HUGE pump setups. I have 2 fuel pumps Y'd together in parallel with a BONE stock return line, and I can run fuel pressures as low as 26 PSI.
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