I'm looking at doing ~750cc primary injectors. Should I run high or low impedence injectors?

Originally I was planning on running a set of 800cc low impedence but thought I could save some money on the injector driver box by running a set of these high impedence injectors. Anyone have any experience with these?

http://www.racetronix.com/01D129xFM.html


Regards,
Justin

 

Why wouldn't you use these?

http://www.rceng.com/Saturated....aspx

 

Why not just run a resistor box for 880's?

 

I'd rather not run a resistor box if I don't have to. How is the low pulse width response on the high impedence 750cc RC's? Can you tune a lean A/F ratio at idle and cruising?

Justin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Justin Olson &raquo;</TD></TR><TR><TD CLASS="quote">I'd rather not run a resistor box if I don't have to. How is the low pulse width response on the high impedence 750cc RC's? Can you tune a lean A/F ratio at idle and cruising?

Justin</TD></TR></TABLE>

running AEM EMS you should have no problem with the 750 sat injectors at idle and cruising.

my 750's idle and cruise quite well with 1-3% duty cycle.......hehe

 

Just buy RC injectors & call it a day. They fit correctly, they offer a high impedance 750cc injector that has a good spray pattern. We sell them all the time & keep plenty in stock due to the popularity of them

 

Just curious here, why the preference for RCs? I *think* I've seen that Precision has 680s in high impedance for a lot less money that the RCs, so is that size just not big enough for what you want to do, or do people prefer RCs for a quality reason? Or both maybe?

Thanks, looking to be enlightened on this topic!

 

Anyone use the Racetronix 79lb/hr injectors? They are a better value then the RC's if they perform.

 

AEM EMS and 750cc Saturated injectors right here, no problems Idles a bit on the rough side but idle was never really tuned...

 

Rc or precision..

 

Precision's can be found for cheaper than RC's and they work just as well.

 

This is exactly what I was wondering about. How does RC continue to have business with their higher prices? Must be some people think they're better. Why is that?

 

AEM EMS and sat 750s here too. zero problems idling them lean. If you have to theres tricks to getting finer control over large injectors with the EMS too such as increasing the microsec/bit value.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tjabo &raquo;</TD></TR><TR><TD CLASS="quote">Just curious here, why the preference for RCs? I *think* I've seen that Precision has 680s in high impedance for a lot less money that the RCs, so is that size just not big enough for what you want to do, or do people prefer RCs for a quality reason? Or both maybe?

Thanks, looking to be enlightened on this topic! </TD></TR></TABLE>

pretty much all siemen/deka style injectors work the same just differnt housing and company labels

rochester
RC
delphi
and some others are siemen/ deka

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony413 &raquo;</TD></TR><TR><TD CLASS="quote">

pretty much all siemen/deka style injectors work the same just differnt housing and company labels

rochester
RC
delphi
and some others are siemen/ deka</TD></TR></TABLE>

Thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tjabo &raquo;</TD></TR><TR><TD CLASS="quote">This is exactly what I was wondering about. How does RC continue to have business with their higher prices? Must be some people think they're better. Why is that?</TD></TR></TABLE>

cause they've been around for longer there was a time when precision injectors did not exist, i remember those days, and RC was ****! some things just work that way.

like when in comes to filters, KN is the name of the game, RC has the injectors on lock down, you think turbo's you think Garrett, etc, etc, etc...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Justin Olson &raquo;</TD></TR><TR><TD CLASS="quote">I'm looking at doing ~750cc primary injectors. Should I run high or low impedence injectors?

Originally I was planning on running a set of 800cc low impedence but thought I could save some money on the injector driver box by running a set of these high impedence injectors. Anyone have any experience with these?

http://www.racetronix.com/01D129xFM.html


Regards,
Justin</TD></TR></TABLE>

it says $75 each
u can buy rc s for that price.............

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blinx9900 &raquo;</TD></TR><TR><TD CLASS="quote">cause they've been around for longer there was a time when precision injectors did not exist, i remember those days, and RC was ****! some things just work that way.</TD></TR></TABLE>
This is exactly what I wanted to know, thanks! ! !

So when my boost level starts to outgrow my current injectors, I'll look to some Precisions. They seem to be the best value in quality injectors, unless I've overlooked something else.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tjabo &raquo;</TD></TR><TR><TD CLASS="quote">This is exactly what I wanted to know, thanks! ! !

So when my boost level starts to outgrow my current injectors, I'll look to some Precisions. They seem to be the best value in quality injectors, unless I've overlooked something else.</TD></TR></TABLE>

usually you can get a set of 96lbs/hour aka ( 1000cc ) siemen deka's for under $300 with shipping. PM me

or you can get a set of bosch 1600cc for around $260 BUT they are a different seat style and require drilling the 12mm fuel rail holes to 14mm.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony413 &raquo;</TD></TR><TR><TD CLASS="quote">

pretty much all siemen/deka style injectors work the same just differnt housing and company labels

rochester
RC
delphi
and some others are siemen/ deka</TD></TR></TABLE>

Delphi's are identical to MSD's and Precision's, but so far, I haven't found any injectors that are the same as RC 750's. Show me some pics or test data of RC's and the rest of the injector brands listed above if you have any. I've looked at RC's spray tip and they were always different. The response times were also different whenever you throw RC's in a car that was tuned for Delphi's or Siemens at the same flow rate.

That's just me, but RC's have always idled better, held AFR's nicer, and finer control when you need it most (huge cam/AEM EMS/etc).

 

I 100% agree. I switched over to using RC exclusively at the shop a few years ago when i went from a set of Precision 1000cc's to RC 1000cc's. There was a night and day difference in idle quality and response time. It cleared up the lean misfire at idle (despite having to run the injector at 12:1 range to get it to stop), and any weird light throttle/light load driving lean misfiring (due to driving the injector at low millisecond times). I can run a car leaner partial throttle without lean misfires with RC compared to anything else. I was sold on them after that point, and wont run anything in our personal cars or sell any other brand.

 

the precision 1000's (really a 950cc) have a pretty harsh spray pattern



i have a set of 1050cc (a true 1050cc) injectors on the way to test out that are modified with a much nicer spray pattern, i'll be curious to see the difference.




the next 2 sets of injectors i am testing for them are a saturated 750cc injector and then a saturated 900cc injector. looking forward to trying out the saturated 900cc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">the precision 1000's (really a 950cc) have a pretty harsh spray pattern



i have a set of 1050cc (a true 1050cc) injectors on the way to test out that are modified with a much nicer spray pattern, i'll be curious to see the difference.




the next 2 sets of injectors i am testing for them are a saturated 750cc injector and then a saturated 900cc injector. looking forward to trying out the saturated 900cc</TD></TR></TABLE>

that top pic is not the spray pattern of a presicison injectors. that pic is from a set of older 950cc RC's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tony the Tiger &raquo;</TD></TR><TR><TD CLASS="quote">

Delphi's are identical to MSD's and Precision's, but so far, I haven't found any injectors that are the same as RC 750's. Show me some pics or test data of RC's and the rest of the injector brands listed above if you have any. I've looked at RC's spray tip and they were always different. The response times were also different whenever you throw RC's in a car that was tuned for Delphi's or Siemens at the same flow rate.

That's just me, but RC's have always idled better, held AFR's nicer, and finer control when you need it most (huge cam/AEM EMS/etc).</TD></TR></TABLE>

yes the bottoms are different from RC to delphi. they are change depending on CC/min

DELPHI


DELPHI


RC