Fuel pressure?

GambitX · 10-24-2011, 12:15 PM

did they drill out the fuel pressure regulator in your fuel pump assembly?

page 15 or 16

http://www.gtmotorsports.com/Manuals..._G37_Coupe.pdf

Neo187H · 10-24-2011, 12:31 PM

Quote:

Originally Posted by GambitX

did they drill out the fuel pressure regulator in your fuel pump assembly?

page 15 or 16

http://www.gtmotorsports.com/Manuals..._G37_Coupe.pdf

Yes, I did as per Stillen's instructions. My main question really is, is this a normal thing? Are people maxing out the 600cc injectors like this?

phunk · 10-24-2011, 02:21 PM

Quote:

Originally Posted by GambitX

did they drill out the fuel pressure regulator in your fuel pump assembly?

page 15 or 16

http://www.gtmotorsports.com/Manuals..._G37_Coupe.pdf

Enlarging the fuel pressure regulator and swirl jet orifaces in the fuel pump assembly are to increase return side flow to eliminate the fuel pressure spike at idle with a larger fuel pump. When you increase the fuel pump output, the regulator is unable to do its job when the engine is at very low load and idle, causing fuel pressure to spike up until you increase load or RPM.

This modification is only for low engine load/RPM fuel pressure control and will have absolutely no effect on overall output capacity of the pump/assembly. It is unrelated to any pressure drop at the top end... it is only related to maintaining pressure control at idle.

GambitX · 10-24-2011, 04:33 PM

Quote:

Originally Posted by phunk

Enlarging the fuel pressure regulator and swirl jet orifaces in the fuel pump assembly are to increase return side flow to eliminate the fuel pressure spike at idle with a larger fuel pump. When you increase the fuel pump output, the regulator is unable to do its job when the engine is at very low load and idle, causing fuel pressure to spike up until you increase load or RPM.

This modification is only for low engine load/RPM fuel pressure control and will have absolutely no effect on overall output capacity of the pump/assembly. It is unrelated to any pressure drop at the top end... it is only related to maintaining pressure control at idle.

ahh that i did not know! thank you for the information

Quote:

Originally Posted by phunk

almost 3 years ago I put together this page for people to understand the 370z fuel pump assembly, but it might make a lot more sense to people who are already familiar with how the 350z version works. BTW some of the G37 have the 350z fuel pump assembly and not the 370z fuel pump assembly.

Perhaps today I will go into this page and update it to explain a lot more and with what findings we have had since actually using these fuel pumps after modifications. I can also add details into specifics with the rest of the 370z fuel system so people know exactly what they are doing and why to do it.

cj-motorsports.com

also so my G37 has the 350z version im assuming because its a early 08 model. Which of the fuel pump assembly is better? 350z/g37 or the newer 370z for FI applications with upgraded pumps or is there really none

10-24-2011, 12:15 PM	#1 (permalink)
GambitX Base Member Join Date: Jul 2011 Location: Tampa FL Posts: 48 Drives: G37 TT Rep Power: 15	did they drill out the fuel pressure regulator in your fuel pump assembly? page 15 or 16 http://www.gtmotorsports.com/Manuals..._G37_Coupe.pdf Last edited by GambitX; 10-24-2011 at 12:25 PM.

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