Change to low imp injectors?
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
Change to low imp injectors? Any reason to change my 80lb Siemens to 80lb low imped if the change wouldn't cost any cash (even swap)? Maybe a better idle and sharper response from the low imped units is what I was thinking.
it will respond better at short pulse widths....
I have never found a downside to going Low impedance as long as the controller can handle it.
its usually pretty noticeable at idle once you get to the point where the previous injectors cant open fast enough....
I couldnt tell you if you are there or not... but I know 80's is usually at that point where it makes a difference for most people
I couldnt tell you if you are there or not... but I know 80's is usually at that point where it makes a difference for most people
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
Right now the 5.3 with the LS6 cam is idling pretty good (I think anyway) at about 750 with a PW of 1.4-1.5, DC = .5%, 31 kpa. This is w/o a trans hooked-up. My guess is that idle speed will have to go up when theres a trans/converter hooked-up.
It idles smooth with the "rough" tune. But hey, if it would be better with the low imp injectors why not!!!
It idles smooth with the "rough" tune. But hey, if it would be better with the low imp injectors why not!!!
9 Second Club
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From: Norn Iron
Modern highZ's are better than old and generally most lowZ's in pretty much all respects
You should have no difficulty with a good set of 80lb highZ injectors.
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
Having said that my engine seems to have a smooth idle and is real responsive when winging the throttle. Don't think I can get it to idle lower than 750 - it gets rough under that.
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Verdad Gallardo Thread Starter
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From: THORNTON, PA (NEAR PHILLY)
9 Second Club
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From: Norn Iron
Now Steve you realize this is the opposite of what I've been reading? Everything I've read states the low Z's out perform the highs everywhere. Unless what I'm reading is old info. I have Siemens 80lbs (actually Ford Racing) so I would imagine these are newer.
Having said that my engine seems to have a smooth idle and is real responsive when winging the throttle. Don't think I can get it to idle lower than 750 - it gets rough under that.
Having said that my engine seems to have a smooth idle and is real responsive when winging the throttle. Don't think I can get it to idle lower than 750 - it gets rough under that.
Back then it would have been almost unthinkable to have 2000cc injectors running an engine sweetly high or low. But today it is quite common and easy....only with highZ injectors.
HighZ has come on leaps and bounds. LowZ hasn't really moved at all.
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I run low z 160's with the Holley HP EFI. It has taken a while but mine idles excellent. I idle mine around 950. I can run it lower I just prefer it at the rpm. You can hear the cam a little better with the higher idle. The Holley can run the low z's so that worked out perfect for me.
I have always heard that high z would be better if you can afford them. I couldn't.
I have always heard that high z would be better if you can afford them. I couldn't.