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Location:
goldcoast
Registered:
June 2005
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1j injector upgrade
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Thu, 06 October 2005 04:37
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hey guys,need some advice on injector sizing ond options,im hoping for around 500 flywheel hp or 330kwts.
first dilema is size some people say 550 injectors will be too small,but an injector bloke reckons if i bump up the fuel pressure they'll be fine and ill get better fuel economy through better atomization.
so what 550 squirters will drop straight in without paying sard price!
am i better of financially making up a new fuel rail myself and changing the impedence?
any ideas?
thanks for any advice
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1j injector upgrade
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Thu, 06 October 2005 04:45
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US Spec 2JZGTE Injectors will go straight in and can be had for about $500 
and they are 550cc
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Location:
goldcoast
Registered:
June 2005
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Re: 1j injector upgrade
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Thu, 06 October 2005 04:55
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yeh id read that but is the impedence the same and will they support the hp?
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1j injector upgrade
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Thu, 06 October 2005 04:55
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| 1j180sx wrote on Thu, 06 October 2005 14:25 |
yeh id read that but is the impedence the same and will they support the hp?
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its a sequential setup and the impedance is close enough i think
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Location:
goldcoast
Registered:
June 2005
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Re: 1j injector upgrade
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Thu, 06 October 2005 05:05
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seqential injectors? i dont understand,is there a difference,will they get me power im after or not sure?
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1j injector upgrade
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Thu, 06 October 2005 05:15
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| 1j180sx wrote on Thu, 06 October 2005 14:35 |
seqential injectors? i dont understand,is there a difference,will they get me power im after or not sure?
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I belive they are a more efficient setup and thus they can handle more power?
Im not sure on this tho...wait for a tech head to get in here and comment
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1j injector upgrade
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Thu, 06 October 2005 05:24
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ffs
don't open mouth unless what you're saying is correct.
2jz injectors either need aftermarket management or a resistor pack to make them work with a 1j
sequential injection has nothing to do with what injectors you put in.
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1j injector upgrade
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Thu, 06 October 2005 06:19
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| MR 1JZ wrote on Thu, 06 October 2005 13:33 |
I was told by someone from this forum that they would drop right in without any electrical system modification...i was mis-informed
I know the sequential injection system doesnt affect the injectors but it allows the same size injectors to support more power, compared to non sequential injection (I didnt word it like that, thats my fault)
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One of the 2JZGTE injectors is the right impedance, I don't know if it's Jap or US though, so you're half right.
On the contrary, I would've thought batch would've been able to support more power because it is pulsing multiple injectors at once instead of individual ones.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1j injector upgrade
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Thu, 06 October 2005 06:31
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I doubt batch vs sequential is going to make that much difference in power, unless you are chasing that last 5kW before maxing out the injectors.
But 550cc injectors will be good for well over 500 flywheel hp
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1j injector upgrade
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Thu, 06 October 2005 06:32
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A set of 440's would be struggling around there.
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Location:
Canberra
Registered:
May 2002
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Location:
Melbourne
Registered:
January 2003
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Re: 1j injector upgrade
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Thu, 06 October 2005 06:55
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why not go some 1s {single port injection} 560cc , 1.3 ohms
Maybe go oldschool v8 style , some rochester 17104988's 746cc , 2.0ohm , thats 149hp est per injector , maybe msd2015's 979cc  bosch 0280 150 351's 735cc 0.7ohm ,
ford e43e-9f593-ac , 588cc 1.4ohms or dare i say it some aftermarket nissan units as there loads about second hand .
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1j injector upgrade
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Thu, 06 October 2005 07:26
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I have USDM 2jz 550’s in mine. They are 1.6ohm so low impedance. Cannot be run by stock ecu. Apparently they have used these injectors in upgraded fuel system (rail, lines, pressure, pump) and made 600rwhp on a US dyno. Less on oz dyno but still shitloads.
However, I would probably buy a top feed rail and run some rochesters.
I am going to up the fuel pressure a bit as I have reached 96% duty but I am running pretty rich 10.5:1 up top.
Also SICO1j only uses 440’s with 60psi base fuel pressure to make 540rwhp but I can’t understand how. It is getting pretty lean though, close to 13.7:1 or even 14:1 up top so I wouldn’t recommend it for long term. However 550’s and upped fuel pressure seems like a good idea to me.
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Location:
Melbourne
Registered:
January 2003
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Re: 1j injector upgrade
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Thu, 06 October 2005 07:32
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The rochester spray pattern is far better than most stock injectors due to being a racing/performance injector . So also worth the extra cost , maybe not the $1g or so a set that the model used on the supercars atm are , but any gain costs.
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Location:
goldcoast
Registered:
June 2005
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Re: 1j injector upgrade
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Thu, 06 October 2005 12:54
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ok so sounds like 550 s will be big enough and ill be running after market ecu,so what else would fit in other than 2j jobies,rx7?
ill probly rip em out this weekend so i know what im lookin at
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1j injector upgrade
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Thu, 06 October 2005 12:57
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IIRC rx7 are top feed. 1j uses side feed.
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Registered:
March 2003
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Re: 1j injector upgrade
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Thu, 06 October 2005 16:54
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I have 2JZ 440cc injectors for sale. $350.
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Location:
goldcoast
Registered:
June 2005
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Re: 1j injector upgrade
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Sat, 08 October 2005 02:25
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thanks but i need 550s min
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Location:
perth WA
Registered:
January 2003
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Re: 1j injector upgrade
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Sat, 08 October 2005 09:28
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us spec 2jz 550c are flowing 400rwhp atm in my car , with stock fuel rail , could up the pressure and get more .. my inj where at about 90%
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