after market fuel rail and fuel regulater?????
#4
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Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
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The stock 5/16" fuel line is good for about 300hp before it starts to strain your fuel pump. You can put -6 AN fittings and lines on the stock S4 fuel rail, which are good for about 500hp in series (nearly 1000hp in parallel) before starting to strain the fuel pump.
http://fc3spro.com/TECH/MODS/FUEL/fpr.htm
Aeromotive and SX make excellent fuel components. See the Aeromotive catalog for EFI fuel system component recommendations for a given hp level.
http://aeromotiveinc.com/
http://www.sx-performance.com/
You can get drop-in high-flow injectors from Injector Dynamics:
https://www.rx7club.com/forum/showthread.php?t=920086
Here is the link to aftermarket rails if you still want them for some reason. They are usually made for 3/8" NPT fittings, which are basically the same as the -6 AN fittings that you can put on the stock S4 rails. Most people only use aftermarket rails like this if their stock rails don't allow for fitting a FPR, fitting, or certain types of fuel injectors. For example, FD RX-7 owners may want an aftermarket rail in order to use top-feed injectors rather than the stock side-feed injectors.
http://kgparts.com/index.php?page=kgfuel
http://fc3spro.com/TECH/MODS/FUEL/fpr.htm
Aeromotive and SX make excellent fuel components. See the Aeromotive catalog for EFI fuel system component recommendations for a given hp level.
http://aeromotiveinc.com/
http://www.sx-performance.com/
You can get drop-in high-flow injectors from Injector Dynamics:
https://www.rx7club.com/forum/showthread.php?t=920086
Here is the link to aftermarket rails if you still want them for some reason. They are usually made for 3/8" NPT fittings, which are basically the same as the -6 AN fittings that you can put on the stock S4 rails. Most people only use aftermarket rails like this if their stock rails don't allow for fitting a FPR, fitting, or certain types of fuel injectors. For example, FD RX-7 owners may want an aftermarket rail in order to use top-feed injectors rather than the stock side-feed injectors.
http://kgparts.com/index.php?page=kgfuel
#6
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Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
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If you are questioning the numbers that I am posting, I am using the simplified guidance from "Four-stroke Performance Tuning" by A. Graham Bell. The Aeromotive catalog has a nice guide that is product-oriented rather than number-oriented. The actual equation is rather complicated, as it depends on the fuel flow volume rate (will vary with the BSFC of each engine), fuel density (specific gravity and temperature), fuel line length, ambient pressure, and the Darcy-Weisbach friction coefficient and Reynolds number of the fuel line. Once you figure all that then you would decide on what is an acceptable pressure restriction for your given application. Even though I normally like crunching the numbers on my own for other factors, in this case I find the simplified guides much easier to deal with.
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