will a b&m fpr affect boost?
01-07-2003, 08:10 PM
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will a b&m fpr affect boost?
i remember reading something that the fpr keeps the static pressure very high and will not let me boost right. i believe its a fuel pressure riser and not regulator. i have 1 of these right now on my b18b motor(soon be have a drag 3 on). does anyone have experience with this? or how knowledge they can provide me with? thanks in advance.
ps. its the 1 were you cut your stock fpr in half and plug in the new 1 on top.
ps. its the 1 were you cut your stock fpr in half and plug in the new 1 on top.
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01-13-2003, 06:18 AM
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Re: will a b&m fpr affect boost? (ninesecrx)
Yeah it's good and all, but he wants to know why. So do I. I've never tried the B7M is it better than the AEM or are they equal?
01-13-2003, 07:36 AM
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Re: will a b&m fpr affect boost? (wickedxboi)
If I'm understanding your question correctly, you are concerning about high pressure associates with fpr. What happens is when you install a high pressure pump to your setup, the stock or non-modified fpr can not return the excessive fuel quickly enough back to the fuel tank from the fpr return port due to the small orifice. Therefore, the idle and static fuel pressure would increase as a result. Since your WOT fuel pressure is based on the static pressure, the higher static pressure would also yield a higher WOT. If the static fuel pressure is now increased to 55 psi due to the high pressure fuel pump, then boost pressure x FMU rise rate + static = potentially high fuel pressure.
The B&M is basically a device clamps on top the "stock" fpr which allows certain amount of fuel pressure adjustment. It still doesn't change the size of the orifice in the return line to reduce pressure. You might be able to loosen the adjustment screw enough to reduce the tension applies to the diaphragm to reduce fuel pressure, but it's usually not enough. Some people would opted to drill a small hole to the stock FPR in effort to reduce the fuel pressure. This method does work. However, since the hole actually allows fuel to bypass the orifice directly to the fuel return port, it also creates starting problem due to pressure not holding during cranking. Most people would have to turn the key a few times to build up pressure prior to starting the engine.
The AEM for example has the ability to change the size of the orifice. Therefore, the high idle/static fuel pressure problem with high pressure pump does not exist or very minimum. The fuel pressure also holds very well during crank for easier starting of the engine.
The FPR is needed for the fuel ramp up transistion from high vacuum (20+) to about 10 inches, becasue the FMU can only manage the fuel increase from approx. 9-10 inches of vacuum and up. If you are driving without the FPR and cruising in high vacuum, the part throttle might be a little flat due to lean condition momentary until about 9-10 inches, where the FMU would take over and supply fuel to the engine. If you actually watching the fuel pressure and vacuum gauge, you can see it happen. HTH...
[Modified by JT, 8:38 AM 1/13/2003]
The B&M is basically a device clamps on top the "stock" fpr which allows certain amount of fuel pressure adjustment. It still doesn't change the size of the orifice in the return line to reduce pressure. You might be able to loosen the adjustment screw enough to reduce the tension applies to the diaphragm to reduce fuel pressure, but it's usually not enough. Some people would opted to drill a small hole to the stock FPR in effort to reduce the fuel pressure. This method does work. However, since the hole actually allows fuel to bypass the orifice directly to the fuel return port, it also creates starting problem due to pressure not holding during cranking. Most people would have to turn the key a few times to build up pressure prior to starting the engine.
The AEM for example has the ability to change the size of the orifice. Therefore, the high idle/static fuel pressure problem with high pressure pump does not exist or very minimum. The fuel pressure also holds very well during crank for easier starting of the engine.
The FPR is needed for the fuel ramp up transistion from high vacuum (20+) to about 10 inches, becasue the FMU can only manage the fuel increase from approx. 9-10 inches of vacuum and up. If you are driving without the FPR and cruising in high vacuum, the part throttle might be a little flat due to lean condition momentary until about 9-10 inches, where the FMU would take over and supply fuel to the engine. If you actually watching the fuel pressure and vacuum gauge, you can see it happen. HTH...
[Modified by JT, 8:38 AM 1/13/2003]
01-13-2003, 08:17 AM
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Re: will a b&m fpr affect boost? (JT)
If I'm understanding your question correctly, you are concerning about high pressure associates with fpr. What happens is when you install a high pressure pump to your setup, the stock or non-modified fpr can not return the excessive fuel quickly enough back to the fuel tank from the fpr return port due to the small orifice. Therefore, the idle and static fuel pressure would increase as a result. Since your WOT fuel pressure is based on the static pressure, the higher static pressure would also yield a higher WOT. If the static fuel pressure is now increased to 55 psi due to the high pressure fuel pump, then boost pressure x FMU rise rate + static = potentially high fuel pressure.
The B&M is basically a device clamps on top the "stock" fpr which allows certain amount of fuel pressure adjustment. It still doesn't change the size of the orifice in the return line to reduce pressure. You might be able to loosen the adjustment screw enough to reduce the tension applies to the diaphragm to reduce fuel pressure, but it's usually not enough. Some people would opted to drill a small hole to the stock FPR in effort to reduce the fuel pressure. This method does work. However, since the hole actually allows fuel to bypass the orifice directly to the fuel return port, it also creates starting problem due to pressure not holding during cranking. Most people would have to turn the key a few times to build up pressure prior to starting the engine.
The AEM for example has the ability to change the size of the orifice. Therefore, the high idle/static fuel pressure problem with high pressure pump does not exist or very minimum. The fuel pressure also holds very well during crank for easier starting of the engine.
The FPR is needed for the fuel ramp up transistion from high vacuum (20+) to about 10 inches, becasue the FMU can only manage the fuel increase from approx. 9-10 inches of vacuum and up. If you are driving without the FPR and cruising in high vacuum, the part throttle might be a little flat due to lean condition momentary until about 9-10 inches, where the FMU would take over and supply fuel to the engine. If you actually watching the fuel pressure and vacuum gauge, you can see it happen. HTH...
[Modified by JT, 8:38 AM 1/13/2003]
The B&M is basically a device clamps on top the "stock" fpr which allows certain amount of fuel pressure adjustment. It still doesn't change the size of the orifice in the return line to reduce pressure. You might be able to loosen the adjustment screw enough to reduce the tension applies to the diaphragm to reduce fuel pressure, but it's usually not enough. Some people would opted to drill a small hole to the stock FPR in effort to reduce the fuel pressure. This method does work. However, since the hole actually allows fuel to bypass the orifice directly to the fuel return port, it also creates starting problem due to pressure not holding during cranking. Most people would have to turn the key a few times to build up pressure prior to starting the engine.
The AEM for example has the ability to change the size of the orifice. Therefore, the high idle/static fuel pressure problem with high pressure pump does not exist or very minimum. The fuel pressure also holds very well during crank for easier starting of the engine.
The FPR is needed for the fuel ramp up transistion from high vacuum (20+) to about 10 inches, becasue the FMU can only manage the fuel increase from approx. 9-10 inches of vacuum and up. If you are driving without the FPR and cruising in high vacuum, the part throttle might be a little flat due to lean condition momentary until about 9-10 inches, where the FMU would take over and supply fuel to the engine. If you actually watching the fuel pressure and vacuum gauge, you can see it happen. HTH...
[Modified by JT, 8:38 AM 1/13/2003]
01-13-2003, 08:59 AM
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Re: will a b&m fpr affect boost? (wickedxboi)
i had problems with the B&M regulator when boosted
the fuel pressure just drops, it doesn't go up
at idle it's fine, 43 psi, but when u give it gas, the pressure drops
i think it was just due to my being boosted
the fuel pressure just drops, it doesn't go up
at idle it's fine, 43 psi, but when u give it gas, the pressure drops
i think it was just due to my being boosted
01-13-2003, 09:01 AM
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Re: will a b&m fpr affect boost? (wickedxboi)
have any had any experience with the SX FPR? I was going to turn to B&M, but now after this topic I think i'm turning to the SX FPR instead
01-13-2003, 05:54 PM
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Re: will a b&m fpr affect boost? (JdmRiceMonster)
should i switch to the stock regulator? i am going to run the 12:1 fmu and a high pressure walbro intank pump.
01-13-2003, 06:30 PM
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Re: will a b&m fpr affect boost? (TurbothisLS)
thanks...TurbothisLS
i cant adjust the regulator to the stock setting? wouldnt that allow me to boost right?
i cant adjust the regulator to the stock setting? wouldnt that allow me to boost right?
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