the_mork
15+ Year Contributor
- 2,619
- 26
- Mar 10, 2008
-
Eau Claire,
Wisconsin
I've been trying to handle some overrun from an evo9 fuel pump for a while now and I'm throwing ideas around to see if I can manage to get away with not buying an AFPR because I just can't spend that money right now and a more elegant solution using stock parts would be really nifty.
My first big idea was to use the provision on my evo8 ecu to handle a second circuit for the fuel pump which had a resistor in it for low load situations and a rewired large diameter circuit for high load situations. I have not abandoned this at all and what has happened so far (not a whole lot) can be found here.
http://www.dsmtuners.com/forums/tun...el-pump-wiring-then-help-me-build-my-car.html
Unfortunately I'm moving right now so I wont have time to experiment with this sort of setup for a fair amount of time or even until winter so for the moment I would like to focus on the FPR itself. I can do a lot more work on a small spare part than the DD that I need to get me to school and back.
The main question that I have is what is the greatest impedance to the stock FPR doing its job with a greater fuel volume? I have read conflicting opinions on this with some people saying that the fuel return fitting is too small and other saying that the fuel relief orifice inside of the FPR is too small. It is certainly possible that both are correct. If it is only the internal orifice I should be able to do something like this The Old One - Energy Dynamics : Articles which has been suggested in a couple of places but most recently by tkelly27. If it is the return fitting then I may be able to cut off the return fitting and weld on a new larger fitting.
The second question is can anyone provide me with as much information about the stock FPR as possible? I understand the basic workings of it but I've never been inside one to play with it, pictures of a cut open regulator would be great.
The final question (for now) is would putting a relief hole in the FPR like the one in the article negatively effect fuel pressure? I'm certain if I do some modifying I will have to buy a gauge to verify safety but I'd hate to put a bunch of work into this just to find out that I've made a FPR that cuts the size of my injectors in half.
My first big idea was to use the provision on my evo8 ecu to handle a second circuit for the fuel pump which had a resistor in it for low load situations and a rewired large diameter circuit for high load situations. I have not abandoned this at all and what has happened so far (not a whole lot) can be found here.
http://www.dsmtuners.com/forums/tun...el-pump-wiring-then-help-me-build-my-car.html
Unfortunately I'm moving right now so I wont have time to experiment with this sort of setup for a fair amount of time or even until winter so for the moment I would like to focus on the FPR itself. I can do a lot more work on a small spare part than the DD that I need to get me to school and back.
The main question that I have is what is the greatest impedance to the stock FPR doing its job with a greater fuel volume? I have read conflicting opinions on this with some people saying that the fuel return fitting is too small and other saying that the fuel relief orifice inside of the FPR is too small. It is certainly possible that both are correct. If it is only the internal orifice I should be able to do something like this The Old One - Energy Dynamics : Articles which has been suggested in a couple of places but most recently by tkelly27. If it is the return fitting then I may be able to cut off the return fitting and weld on a new larger fitting.
The second question is can anyone provide me with as much information about the stock FPR as possible? I understand the basic workings of it but I've never been inside one to play with it, pictures of a cut open regulator would be great.
The final question (for now) is would putting a relief hole in the FPR like the one in the article negatively effect fuel pressure? I'm certain if I do some modifying I will have to buy a gauge to verify safety but I'd hate to put a bunch of work into this just to find out that I've made a FPR that cuts the size of my injectors in half.
