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Location:
Preston
Registered:
June 2002
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1JZ Injectors
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Thu, 20 June 2002 23:11
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How do you go about removing the injectors from a 1JZ???
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Registered:
May 2002
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Re: 1JZ Injectors
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Fri, 21 June 2002 08:08
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Clearly identify where all the vacuum hoses attach to what part of the inlet plenum,then disconnect them.Undo the three bolts(from memory) that hold the fuel rail in place,and carefully maneuvre it out(consider of course the fuel feedline and fuel return line).Access to the injectors is now solved.You can do them individually,but it is very slow and difficult with normal sized hands!
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Location:
Preston
Registered:
June 2002
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Re: 1JZ Injectors
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Fri, 21 June 2002 08:29
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Meaning they can be removed with the intake plenum in place??
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Registered:
May 2002
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Re: 1JZ Injectors
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Sun, 23 June 2002 01:52
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both methods i mentioned allow for the intake plenum to. stay in place.
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: 1JZ Injectors
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Sun, 23 June 2002 02:24
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Are you replacing them? I heard that the 430cc injectors from the Japanese 2jz (not US model) were a straight fit, and that the computer adjusts the tuning on closed loop.
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Registered:
June 2002
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Re: 1JZ Injectors
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Sun, 23 June 2002 17:46
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I am doing this right now-dropping in the jap spec 2j injectors(440's) They will defintily fit in without issue, will have to see how the car adjusts to them. They are the right impedence(high) as the 1j ones. The us spec 550's from the 2j will also drop right in the rail and plug in, but are low impedence injectors and you will have to wire in a resistor to get these to work. The stock ma70 resistor should work fine here.
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Location:
Preston
Registered:
June 2002
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Re: 1JZ Injectors
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Sun, 23 June 2002 22:18
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Let me know how it goes when you've finished!
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Location:
gold coast
Registered:
May 2002
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Re: 1JZ Injectors
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Mon, 24 June 2002 10:48
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Why??? Tell me you didn't pay good money for them??
They flow 60 Hp more then 1J units.
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Location:
Preston
Registered:
June 2002
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Re: 1JZ Injectors
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Mon, 24 June 2002 12:57
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Yeah but i can get a set of 2jz injectors for free off a friend who imports cars, and it seems my current injectors need to be cleaned which i've been qouted just under $200 for.
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: 1JZ Injectors
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Mon, 24 June 2002 14:22
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Free injectors for the JZ - that sounds good! Does he have a spare boxfull? 
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Location:
Wollongong
Registered:
May 2002
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Re: 1JZ Injectors
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Mon, 24 June 2002 14:44
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Put me down for 6 spares 
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Location:
Preston
Registered:
June 2002
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Re: 1JZ Injectors
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Mon, 24 June 2002 22:39
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LOL if it was only that easy. My friend imported a Supra about a month ago, which came with engine work already done: bigger turbos, intercooler, exhaust, boost controller etc. But the whole fuel system had been returned to stock! We couldnt figure out why. Out of all the things to take from that particular engine, why bother with the fuel system? But similar story about a year ago, the same friend imported an R32 GTR which came with dyno figures of 740ps. Once it got here, if the car ever actually ran, it ran like crap. Checked out everything in the engine. Stroked to 2.8, Single BIG turbo, intercooler, boosted, and anything else you could imagine (the car was apparently an ex demo car for a workshop in Japan) By now he suspected internal damage because everyhing else looked fine. But when checking the computer, it had been replaced with a stock factory item. Not even re written! Again out of all the things to take from this car (like the whole engine itself!!!) why just the computer??? Oh well, anyways that supra is where the injectors are coming from.
By the way after a few months of fixing the skyline and putting a new computer in (and thrashing it!), he sold it to some guy (Cheap! like 35 odd grand) About 2 weeks later the guy returned with some sort of engine problem. Seems like he decided it still wasn't fast enough, fiddled with the boost controller and took it on the track on normal unleaded and melted some pistons.
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Location:
Newcastle, NSW, Australia
Registered:
May 2002
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Re: 1JZ Injectors
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Wed, 26 June 2002 02:51
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Why are you replacing the injectors? If you are using stock turbo’s you will not max out standard injectors. Replacing them with 2J injectors will just make your car run rich right throughout the rev range and give you over fuelling problems at idle and use considerable more petrol on boost. It will not give you any more power.
Closed loop will only adjust the injector pulse at idle and light cruise and even then, only to a certain degree. Our experience has shown that at idle, the computer will not pull enough fuel out to prevent plug fouling.
If you have upgraded to a single turbo then you may have a reason for needing more fuel but my advice is to check the duty cycle before swapping injectors. At the end of the day, any serious turbo mod will also need either an interceptor module, modified ECU (Mines for example) or a full aftermarket system to be effective.
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