What Size Injectors for Boost Reference Fuel System

pokeyl · 05-20-2015, 11:35 AM

Quote:

Originally Posted by KratikosG37

Using 750cc because of your NX system?

Yes, I need a 20% fuel increase over 650cc to make 600 rwhp.

KratikosG37 · 05-20-2015, 12:47 PM

Quote:

Originally Posted by pokeyl

Yes, I need a 20% fuel increase over 650cc to make 600 rwhp.

Not go off topic, but you like that over a turbo system?

must be running a 150shot for that kind of power.

pokeyl · 05-20-2015, 02:47 PM

Quote:

Originally Posted by KratikosG37

Not go off topic, but you like that over a turbo system?

must be running a 150shot for that kind of power.

GTM SC 1.5 with 13 psi boost with NOS is my goal

pokeyl · 05-21-2015, 08:34 PM

One more question, why not put the FPR at the pump with a short return line. Is there a reason to have it at the fuel rail? I would then run a boost reference line back to the regulator.

phunk · 05-21-2015, 08:46 PM

You can if you want, the old APS turbo kit for 350z came with a mini return that did that. You dont get all the benefits of a return system, but you get some.

You get the most out of your fuel system by regulating pressure after restrictions (sources of pressure drop), rather than before. Especially when running dinky stock fuel pipe/lines.

pokeyl · 05-21-2015, 08:56 PM

So a set of your fuel rails new supply and return lines with FPR. Copy all thanks.

phunk · 05-21-2015, 09:06 PM

The rails will allow you to improve flow into the rail bores where the stock rails have a little inlet tube attached to them. But you can also do a return up front with the stock rails like our S0 kit does, we sell the billet fitting and fuel pump module modifications separate if you wanted to build your own engine bay return off the stock rails. I have tested this type of setup to about 600rwhp with E85, and I suggest new rails for better plumbing beyond that. But if using gasoline rather than E85, 700 *might* be a reality on the stock rails.

pokeyl · 05-21-2015, 09:27 PM

I currently run a 255 pump @ 12 psi of boost. I have 750cc injectors and have adjusted my K factor to run the base 1.5 SC tune from GTM. I am adding a 50 shot of NOS just after the compressor. I will make a trip to Z1 for my tune. The last thing I want is to run out of fuel pressure during the tune.

So I plan on a 340 pump and a return line with boost ref regulator and a new base pressure of 60 psi. 93 pump gas only

KratikosG37 · 05-22-2015, 08:58 AM

S/C plus 50 shot seems like a fun setup. Don't forget to post a few vids, and dyno pulls.

Good luck.

05-21-2015, 08:34 PM	#19 (permalink)
pokeyl Track Member Join Date: Nov 2010 Location: DFS Posts: 891 Drives: ??? Rep Power: 54	One more question, why not put the FPR at the pump with a short return line. Is there a reason to have it at the fuel rail? I would then run a boost reference line back to the regulator. __________________ It's not my fault I'm old, I was born a very long time ago!

05-21-2015, 08:46 PM	#20 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,654 Drives: 370 Rep Power: 944523	You can if you want, the old APS turbo kit for 350z came with a mini return that did that. You dont get all the benefits of a return system, but you get some. You get the most out of your fuel system by regulating pressure after restrictions (sources of pressure drop), rather than before. Especially when running dinky stock fuel pipe/lines. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

05-21-2015, 08:56 PM	#21 (permalink)
pokeyl Track Member Join Date: Nov 2010 Location: DFS Posts: 891 Drives: ??? Rep Power: 54	So a set of your fuel rails new supply and return lines with FPR. Copy all thanks. __________________ It's not my fault I'm old, I was born a very long time ago!

05-21-2015, 09:06 PM	#22 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,654 Drives: 370 Rep Power: 944523	The rails will allow you to improve flow into the rail bores where the stock rails have a little inlet tube attached to them. But you can also do a return up front with the stock rails like our S0 kit does, we sell the billet fitting and fuel pump module modifications separate if you wanted to build your own engine bay return off the stock rails. I have tested this type of setup to about 600rwhp with E85, and I suggest new rails for better plumbing beyond that. But if using gasoline rather than E85, 700 might be a reality on the stock rails. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

05-21-2015, 09:27 PM	#23 (permalink)
pokeyl Track Member Join Date: Nov 2010 Location: DFS Posts: 891 Drives: ??? Rep Power: 54	I currently run a 255 pump @ 12 psi of boost. I have 750cc injectors and have adjusted my K factor to run the base 1.5 SC tune from GTM. I am adding a 50 shot of NOS just after the compressor. I will make a trip to Z1 for my tune. The last thing I want is to run out of fuel pressure during the tune. So I plan on a 340 pump and a return line with boost ref regulator and a new base pressure of 60 psi. 93 pump gas only __________________ It's not my fault I'm old, I was born a very long time ago!

05-22-2015, 08:58 AM	#24 (permalink)
KratikosG37 Enthusiast Member Join Date: Jun 2014 Location: New Orleans, LA Posts: 273 Drives: 09 TT Wrapped G37 Rep Power: 10	S/C plus 50 shot seems like a fun setup. Don't forget to post a few vids, and dyno pulls. Good luck. __________________ KratikosG37 Build Log http://www.myg37.com/forums/build-th...ml#post3888739 Last edited by KratikosG37; 05-26-2015 at 09:09 PM.

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