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Location:
Warrnambool, Victoria
Registered:
July 2002
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Injector question.
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Thu, 03 February 2005 03:36
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Hi, are the 7M-GE and 3S-GE injectors the same?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Location:
Warrnambool, Victoria
Registered:
July 2002
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Re: Injector question.
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Thu, 03 February 2005 14:22
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MMM so they wont be interchangeable? Bugger.
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Location:
Sydney
Registered:
June 2004
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Re: Injector question.
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Thu, 03 February 2005 14:26
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| wumpagrande1992 wrote on Fri, 04 February 2005 01:22 |
MMM so they wont be interchangeable? Bugger.
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why not? from the list there are 2 types and the second ones are exactly the same... the 315cc ones
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Injector question.
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Thu, 03 February 2005 14:29
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But if he has lo-impedance ones, the 3S-GE ones are useless for the factory ecu.
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Location:
Warrnambool, Victoria
Registered:
July 2002
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Location:
Sydney
Registered:
April 2004
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Injector question.
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Fri, 04 February 2005 00:54
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| bathurst-91 wrote on Fri, 04 February 2005 05:21 |
What ranges classify 'low' and 'high' impedence respectively?
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The resistance of the coil in the injector.
Low impedance = 2ohms.
High impedance = 13ohms.
@ 12volts a low impedance injector drain 6A, where as a high impedance injector drain 1A.
Put the wrong one in, and you can fry the ECU
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Injector question.
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Fri, 04 February 2005 01:13
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but if you have aftermarket management, I've been led to believe that it doesn't matter... do you have to tell the ecu whether you're running hi or low impedence injectors, or does it "figure it out"??
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Injector question.
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Fri, 04 February 2005 01:21
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I dunno hey.
Coz changing high impedance injectors for low impendace ones will run 6 times the current through the earth switch on the ecu.
It may well be designed to cope with this.
It may well not!
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Location:
Melbourne
Registered:
June 2004
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Re: Injector question.
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Fri, 04 February 2005 01:25
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You could put a resistor or an induction coil inline with the Low-impedance Injector to get the power-drain right, if the injector would still function with the lower current . . . .
Alternatively, you can use big paired transistors as ultra-high speed relay switches, using low/zero current from the ECU to switch the big current into the injectors, or coils, or anything really. the switching lag would be a few milliseconds at most, so It won't stuff your injection timing if you've got sequential injection.
is that any help?
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Location:
Brisbane
Registered:
February 2003
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Re: Injector question.
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Fri, 04 February 2005 02:37
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your the second suggestion would make things worse rather than better - ECU's with formal time resolution will be working in units of 0.1m/s, some (particularly aftermarket units trying to get large-culume injectors to idle) will work down to a 10th of that.
if your ECU is designed to see high Z and you only have low Z injectors, you could put a resistor pack (from a car that uses those same injectors) inline between injectors and the power source
many ECU's can be configured to run high or low Z injectors - but will not autoconfigure
an induction coil will not help you
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