Aftermarket fuel rail install - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

saurus · 2nd June 2008, 08:12 PM

How easy or hard is it to change to an aftermarket fuel rail such as the likes of HKS, SARD, etc ?

Is it a straight forward procedure or is there a lot of mucking around needed to accomplish this task ?

Your feedback will help me out, So do voice out. Thanks.

christino · 8th June 2008, 07:21 PM

same question..

aki · 9th June 2008, 04:47 PM

I't not hard but it is really fidly. Try not to drop any of the insulators or metal clips for the injector plug into the engine bay as you'll never get them back out again. I've got a sard rail and have set it up so that fuel enters into either side of the rail and exits at the centre. If you're planning on doing the same set up then you'll need to insert a 'T' piece into the fuel inlet pipe to split it.

Light-R · 9th June 2008, 06:32 PM

aki, i have 600cc injectors and stock fuel rail.
do you know which fuel rail i should go for when upgrading to 1000cc injectors?
i have heard about 10.5mm and 11mm, but i dont know which ones are 1000cc.

thanks mate

aki · 10th June 2008, 01:56 PM

Quote:

Originally Posted by Light-R

aki, i have 600cc injectors and stock fuel rail.
do you know which fuel rail i should go for when upgrading to 1000cc injectors?
i have heard about 10.5mm and 11mm, but i dont know which ones are 1000cc.

thanks mate

Which injectors do you have? Most of the Japanese brands (HKS, Blitz and Sard etc) are actually re-branded Nippon Denso injectors. If its one these then you will need the fuel rail with 11mm holes. The best way to find out which ones you need would be to compare the injectors. Measure the diameter of the section that fits into the rail. The 1000cc injectors should be slightly bigger than the current 600cc injectors you have installed (assuming their nismo injetcors).

mifn21 · 10th June 2008, 03:22 PM

What colour are your injectors? JECS make the ones Tomei and Nismo sell (they make the original GTR ones too) and these are 10.5mm

The Densos will still fit a stock rail just make sure you lube the seals well before you insert them!

Light-R · 10th June 2008, 08:09 PM

thanks mifn

my injectors are 600cc nismo's.

they are running a bit overkill up in the rev range. i have my limiter at 7200rpm now, to avoid killing anything.

im running 645bhp on high boost altough i rarely use it. will be doing a track day soon on low boost. but i will probably have to buy a fuel rail and a set of 1000cc injectors just to be sure.

thanks mate

Piggaz · 11th June 2008, 11:48 AM

^^^^
What fuel pump(s) are you running..... I know my nismo pump will outflow my 800 CC injectors.

Light-R · 11th June 2008, 11:55 AM

i only have 1 fuel pump, and i was told it is nismo 280 l/h?

Piggaz · 12th June 2008, 07:51 AM

Quote:

Originally Posted by Piggaz

^^^^
What fuel pump(s) are you running..... I know my nismo pump will outflow my 800 CC injectors.

Oops. The other way around.... my injectors will outflow my pump.

Light-R · 12th June 2008, 07:46 PM

yeah, i got it mate.
=)

Light-R · 31st July 2008, 12:46 AM

piggaz, as you said, how much power are you running?
whats the maximum duty that your injectors see?
and, how do you know that they outflow your pump? does the fuel pressure decrease?

Piggaz · 31st July 2008, 07:38 AM

Roughly 650 HP at the fly

Fuel pressure doesnt drop at all (Fuel pressure gauge in cabin)

Nismo pump will flow 4.6 litres per minute
I am running 800 Sards. So .8 X 6 = 4.8 litres per minute

The most i see is 90 - 91% on the PFC hand controller which is roughly 4.36 Litres per minute. Still a little bit of headroom... but not as much as I would like.

Thats on a 2.8 litre with twin GT - RS's @ 1.65 bar

Light-R · 31st July 2008, 08:29 AM

yes piggaz
i did the math the other way around.
started by the injectors, and roughly came to the same result.

800cc on 85% duty will give me 680cc x6=4080cc/min=4.08l/min=244l/h

bearing in mind that the fuel pump is capable of 276, we agree on the safe side.

lets just see how much duty i get when i get the chance to raise the rev to 8000.

i am revving to 7250 so that the injectors dont pass 90% duty

Light-R · 7th August 2008, 09:18 AM

just ordered 1000cc ones.

is there any way to fit another fuel pump without fitting a surge tank?

2nd June 2008, 08:12 PM	#1 (permalink)
saurus GTR Register Member Join Date: Jan 2007 Posts: 20	Aftermarket fuel rail install How easy or hard is it to change to an aftermarket fuel rail such as the likes of HKS, SARD, etc ? Is it a straight forward procedure or is there a lot of mucking around needed to accomplish this task ? Your feedback will help me out, So do voice out. Thanks.

9th June 2008, 04:47 PM	#3 (permalink)
aki GTR Register Member Join Date: May 2003 Location: NE Posts: 230	sard fuel rail I't not hard but it is really fidly. Try not to drop any of the insulators or metal clips for the injector plug into the engine bay as you'll never get them back out again. I've got a sard rail and have set it up so that fuel enters into either side of the rail and exits at the centre. If you're planning on doing the same set up then you'll need to insert a 'T' piece into the fuel inlet pipe to split it.

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8th June 2008, 07:21 PM	#2 (permalink)
christino GTR Register Member Join Date: Jan 2007 Posts: 82	same question..

9th June 2008, 06:32 PM	#4 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	aki, i have 600cc injectors and stock fuel rail. do you know which fuel rail i should go for when upgrading to 1000cc injectors? i have heard about 10.5mm and 11mm, but i dont know which ones are 1000cc. thanks mate

10th June 2008, 03:22 PM	#6 (permalink)
mifn21 GTROC Member Join Date: Mar 2007 Location: London Posts: 2,074	What colour are your injectors? JECS make the ones Tomei and Nismo sell (they make the original GTR ones too) and these are 10.5mm The Densos will still fit a stock rail just make sure you lube the seals well before you insert them!

10th June 2008, 08:09 PM	#7 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	thanks mifn my injectors are 600cc nismo's. they are running a bit overkill up in the rev range. i have my limiter at 7200rpm now, to avoid killing anything. im running 645bhp on high boost altough i rarely use it. will be doing a track day soon on low boost. but i will probably have to buy a fuel rail and a set of 1000cc injectors just to be sure. thanks mate

11th June 2008, 11:48 AM	#8 (permalink)
Piggaz GTR Register Member Join Date: Sep 2002 Location: Sydney, Australia Posts: 758	^^^^ What fuel pump(s) are you running..... I know my nismo pump will outflow my 800 CC injectors.

11th June 2008, 11:55 AM	#9 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	i only have 1 fuel pump, and i was told it is nismo 280 l/h?

12th June 2008, 07:46 PM	#11 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	yeah, i got it mate. =)

31st July 2008, 12:46 AM	#12 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	piggaz, as you said, how much power are you running? whats the maximum duty that your injectors see? and, how do you know that they outflow your pump? does the fuel pressure decrease?

31st July 2008, 07:38 AM	#13 (permalink)
Piggaz GTR Register Member Join Date: Sep 2002 Location: Sydney, Australia Posts: 758	Roughly 650 HP at the fly Fuel pressure doesnt drop at all (Fuel pressure gauge in cabin) Nismo pump will flow 4.6 litres per minute I am running 800 Sards. So .8 X 6 = 4.8 litres per minute The most i see is 90 - 91% on the PFC hand controller which is roughly 4.36 Litres per minute. Still a little bit of headroom... but not as much as I would like. Thats on a 2.8 litre with twin GT - RS's @ 1.65 bar

31st July 2008, 08:29 AM	#14 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	yes piggaz i did the math the other way around. started by the injectors, and roughly came to the same result. 800cc on 85% duty will give me 680cc x6=4080cc/min=4.08l/min=244l/h bearing in mind that the fuel pump is capable of 276, we agree on the safe side. lets just see how much duty i get when i get the chance to raise the rev to 8000. i am revving to 7250 so that the injectors dont pass 90% duty

7th August 2008, 09:18 AM	#15 (permalink)
Light-R GTR Register Member Join Date: Apr 2007 Location: lisbon Posts: 652	just ordered 1000cc ones. is there any way to fit another fuel pump without fitting a surge tank?