ok guys,
i have been doing some research on fuel pressure regulators lately. mainly because im gonna need one. anyways, this is what i have came up with.
the way a fuel pressure regulator works is it controlls the amount of fuel allowed to flow back to the tank (from the return line). the less flow back to the tank the more pressure in the rail.
so, in order to increase the pressure in the rail all you have to do is simply decrease the flow back to the tank. so i got to looking at all the fuel pressure regulators offered out ther and came up with this....
the ones that allow you to lower pressure are the way to go. but if you buy the ones that cut off the top of your stock one, or just raise pressure you are getting ripped off bad!!! sure they look nice, but all they are doing is putting more pressure on the stock valve.
to achive the same exact results as one of these all you need is a bleeder style valve. i got mine at diamond hardware. i put on a 1/4 inch barb on each side and spliced into my fuel return line. clamped it all off and went out to test it.
what i found..... at an idle it you close the valve all the way i will idle up about 500 rpms. the reason is pretty obvious. no fuel returning. so i cracked it open just a little so my idle returned to normal. i then took it for a drive. i was able to run more boost and run with lower egt's. 20c degrees lower with 2 more psi. also my a/f read richer in the higher rpms. so i know it worked.
the reason i even considered doing this is because right now im saving up for a few things and dont have the money to spend. also i was getting too much knock at 6000 rpms and above. now i am running alot better, and only for 10 bucks.
of course its not a permanent mod, its just somthing that i will use to get me by untill i can afford the "good" fpr. its a cheap solution that will work safely. i think it may reduce gas mileage though.
anyways, if you have any questions just ask. ill try and post a pic tomorrow.
Brent
i have been doing some research on fuel pressure regulators lately. mainly because im gonna need one. anyways, this is what i have came up with.
the way a fuel pressure regulator works is it controlls the amount of fuel allowed to flow back to the tank (from the return line). the less flow back to the tank the more pressure in the rail.
so, in order to increase the pressure in the rail all you have to do is simply decrease the flow back to the tank. so i got to looking at all the fuel pressure regulators offered out ther and came up with this....
the ones that allow you to lower pressure are the way to go. but if you buy the ones that cut off the top of your stock one, or just raise pressure you are getting ripped off bad!!! sure they look nice, but all they are doing is putting more pressure on the stock valve.
to achive the same exact results as one of these all you need is a bleeder style valve. i got mine at diamond hardware. i put on a 1/4 inch barb on each side and spliced into my fuel return line. clamped it all off and went out to test it.
what i found..... at an idle it you close the valve all the way i will idle up about 500 rpms. the reason is pretty obvious. no fuel returning. so i cracked it open just a little so my idle returned to normal. i then took it for a drive. i was able to run more boost and run with lower egt's. 20c degrees lower with 2 more psi. also my a/f read richer in the higher rpms. so i know it worked.
the reason i even considered doing this is because right now im saving up for a few things and dont have the money to spend. also i was getting too much knock at 6000 rpms and above. now i am running alot better, and only for 10 bucks.
of course its not a permanent mod, its just somthing that i will use to get me by untill i can afford the "good" fpr. its a cheap solution that will work safely. i think it may reduce gas mileage though.
anyways, if you have any questions just ask. ill try and post a pic tomorrow.
Brent
I was running that thing in my old car before I sold it (seriously)! 
