My fuel system is it enough?

2011 Nismo#91 · 11-30-2020, 12:01 PM

I've been trying to chase down some problems with my TT setup. I seem to lose power very rarely at low engine loads and often at high sustained loads (track). I have noticed though I'm unsure its related the AFR on bank two is a bit 1.5-3 points lower on bank one when it happens, normal numbers are 12-20ish for bank one.

What should be the minimum fuel pump size for my setup. 1050x ID Fuel injectors, stock fuel system with the standard CJM Road Race pump setup. 93Gas with up to 10% ethanol content.

Spooler · 11-30-2020, 12:41 PM

What size fuel pump are you running and did you upgrade to a return system?

2011 Nismo#91 · 11-30-2020, 01:18 PM

Stock. I believe the Road Race setup has a 255lph walbro, the stock pump feeds the Road Race pump.

https://cj-motorsports.com/products/...race-pump-370z

Hotrodz · 11-30-2020, 01:32 PM

How much whp are you pushing and are confident that all your injectors are good?

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2011 Nismo#91 · 11-30-2020, 01:56 PM

493whp, they are new. I'm still trying to get more data, but my ECUtek Dongle's usb connector broke which was my normal way of connecting, in the process of fixing it.

Hotrodz · 11-30-2020, 02:05 PM

Injectors can go bad as I had one that went out and was giving me all kinds of crazy AFRs. Also it could be a bad pump or debris in the tank or filter of the fuel pump.

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Martijn_b · 11-30-2020, 02:07 PM

490whp on stock pump sounds a bit ambitious. Did you upgrade pump wiring?

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2011 Nismo#91 · 11-30-2020, 02:16 PM

Quote:

Originally Posted by Martijn_b

490whp on stock pump sounds a bit ambitious. Did you upgrade pump wiring?

Sent from my SM-G973F using Tapatalk

Not really, upgraded/larger wires to support the CJM addition but that's about it.

rovert · 12-01-2020, 02:58 AM

You need to get a fuel pressure gauge on it that you can read from in the car or on a dyno.
If fuel pressure drops off when the issue arises you'll know your looking in the right place.
If not, you can start to look elsewhere (injectors etc.)
If the stock pump is only feeding the walbro it should be fine in regard to current draw & fuel flow. Thats not to say its not the problem though, as it may be past its "use by".

EndlessZ · 12-01-2020, 11:01 AM

Quote:

Originally Posted by 2011 Nismo#91

Stock. I believe the Road Race setup has a 255lph walbro, the stock pump feeds the Road Race pump.

https://cj-motorsports.com/products/...race-pump-370z

I would start with a rewire of the pump with with a bigger wire and a relay.

Making that much power on stock wiring is asking a lot. Fuel injectors are more

than enough and I highly doubt they're bad since you're not full E85. ID's are

imo the best in the business.

2011 Nismo#91 · 12-02-2020, 07:03 AM

The power wiring to the pumps has been upgraded/replaced.

Jayhovah · 12-02-2020, 10:55 AM

What's the rating of the OEM pump? I am surprised you got nearly 500whp out of it, so it must flow more than I realized.

I am running a Walbro 255 and make 520whp.

11-30-2020, 12:01 PM	#1 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,402 Drives: slowly Rep Power: 40569	My fuel system is it enough? I've been trying to chase down some problems with my TT setup. I seem to lose power very rarely at low engine loads and often at high sustained loads (track). I have noticed though I'm unsure its related the AFR on bank two is a bit 1.5-3 points lower on bank one when it happens, normal numbers are 12-20ish for bank one. What should be the minimum fuel pump size for my setup. 1050x ID Fuel injectors, stock fuel system with the standard CJM Road Race pump setup. 93Gas with up to 10% ethanol content. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

11-30-2020, 01:18 PM	#3 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,402 Drives: slowly Rep Power: 40569	Stock. I believe the Road Race setup has a 255lph walbro, the stock pump feeds the Road Race pump. https://cj-motorsports.com/products/...race-pump-370z __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs Last edited by 2011 Nismo#91; 11-30-2020 at 01:22 PM.

11-30-2020, 01:32 PM	#4 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	How much whp are you pushing and are confident that all your injectors are good? Sent from my SM-G965U using Tapatalk __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

11-30-2020, 01:56 PM	#5 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,402 Drives: slowly Rep Power: 40569	493whp, they are new. I'm still trying to get more data, but my ECUtek Dongle's usb connector broke which was my normal way of connecting, in the process of fixing it. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

11-30-2020, 02:05 PM	#6 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	Injectors can go bad as I had one that went out and was giving me all kinds of crazy AFRs. Also it could be a bad pump or debris in the tank or filter of the fuel pump. Sent from my SM-G965U using Tapatalk __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

11-30-2020, 12:41 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,834 Drives: 2013 Nismo 370z Rep Power: 2684392	What size fuel pump are you running and did you upgrade to a return system?

11-30-2020, 02:07 PM	#7 (permalink)
Martijn_b Enthusiast Member Join Date: Jan 2018 Location: Netherlands Posts: 280 Drives: 2010 370z MB 6MT Rep Power: 3786	490whp on stock pump sounds a bit ambitious. Did you upgrade pump wiring? Sent from my SM-G973F using Tapatalk Hotrodz likes this. __________________ Instagram: Boosted_Fairlady

12-01-2020, 02:58 AM	#9 (permalink)
rovert Base Member Join Date: Nov 2015 Location: Australia Posts: 64 Drives: 08 Skyline 370GT Rep Power: 10	You need to get a fuel pressure gauge on it that you can read from in the car or on a dyno. If fuel pressure drops off when the issue arises you'll know your looking in the right place. If not, you can start to look elsewhere (injectors etc.) If the stock pump is only feeding the walbro it should be fine in regard to current draw & fuel flow. Thats not to say its not the problem though, as it may be past its "use by". Optimiser likes this. __________________ 08 Skyline 370GT SP Coupe 5AT: Diy TT

12-02-2020, 07:03 AM	#11 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,402 Drives: slowly Rep Power: 40569	The power wiring to the pumps has been upgraded/replaced. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

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