High ohm injectors
21-05-2005, 09:26 PM
#44
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Weber ecu's (L1,L2,L6,L8,P8) cannot detect injector faults 
Most aftermarket ecu's do have fault diagnosis on output drivers.
For example, on my S8 ecu, in 8 injector mode, if one injector fails, the coresponding paired injector
is switched off to prevent unbalanced fuel delivery.
A fault code is also stored and a RPM/BOOST limit is set to protect the engine.
Most aftermarket ecu's do have fault diagnosis on output drivers.
For example, on my S8 ecu, in 8 injector mode, if one injector fails, the coresponding paired injector
is switched off to prevent unbalanced fuel delivery.
A fault code is also stored and a RPM/BOOST limit is set to protect the engine.
21-05-2005, 10:18 PM
#48
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turbodisplay,
You are right to an extent, the weber ecu does not know at a software level what is happening with the injector driver stage.
However, from my experience of factory weber ecu's...
When using high impedance injectors on them without any form of matching,
the driver stages usually does 1 of 4 things...
1) work fine - no problems
2) fine control at small pulse widths is impossible.
3) give random pulse widths as the current foldback function gets confused.
4) the output stage latches up. I.E switches on and does NOT switch off !!
Any of the above can happen and sometimes it varys day to day.
I am sure you know this already but the golden rule at the end of the day is to
use the right injectors on the right ecu to be safe !
You are right to an extent, the weber ecu does not know at a software level what is happening with the injector driver stage.
However, from my experience of factory weber ecu's...
When using high impedance injectors on them without any form of matching,
the driver stages usually does 1 of 4 things...
1) work fine - no problems
2) fine control at small pulse widths is impossible.
3) give random pulse widths as the current foldback function gets confused.
4) the output stage latches up. I.E switches on and does NOT switch off !!
Any of the above can happen and sometimes it varys day to day.
I am sure you know this already but the golden rule at the end of the day is to
use the right injectors on the right ecu to be safe !
23-08-2005, 09:40 PM
#54
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Not my car actually, but tried on a fairly standard engine.
Ported head, standard cams, 480 hp Turbonetics turbo, slightly lower comp.
630cc injectors and no resistors...
It goes really well actually.
Ported head, standard cams, 480 hp Turbonetics turbo, slightly lower comp.
630cc injectors and no resistors...
It goes really well actually.
23-08-2005, 10:23 PM
#56
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It's a lvl 6 ecu, the injectors are 12 ohm and has been in from this spring.
The cars is used as an (almost) everyday ride, and does many hard trackdays during the season. It used to run greys.
The cars is used as an (almost) everyday ride, and does many hard trackdays during the season. It used to run greys.
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