MidwestAutoWorks

Just read this quote from Inline Pro.

Just want to see if there is any truth to it.

I really do not want to blow up my fully built motor over faulty injectors..

"RC750's are injectors I would easily stay away from. The 750's if you read the box now, it says do not over pressurize past 42lbs of fuel pressure. If it goes past there, the inejctors will lock up, which I've seen on the injector dyno we have here".

JDogg

i lost 2 motors to those injectors..

sent both sets back to rc and they confirmed intermitten locking up anywhere between 55 and 70psi of pressure.. that was before they had the Warning not to go over 45psi.....

suck it up, wire in a resistor box and use 1000 cc injectors

boosted hybrid

The RC 750cc's that we sell are rated up to 100psi of fuel pressure. I use them all the time, and have never had a single issue. We order in bulk, and specifically request them.

MidwestAutoWorks

+1 for yes
+1 for no

MidwestAutoWorks

RCs site says 30 min, 70 max, wouldnt they change that if there was a problem

JDogg

the peak/hold 750's work fine, the saturated 750's are the ones with the issues.

like i said though.. both times i have had issues they have been confirmed by RC, they were nice enough to give us free shipping back on those injectors.. no replacements or anything

MidwestAutoWorks

I have the saturated ones, so looks like im fubared

Turbo-charged

i have used the saturated 750's on probably 100 cars and never had a problem.

hearing/reading about the problems makes you wonder though

Sprockets

iTrader: (6)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidwestAutoWorks &raquo;</TD></TR><TR><TD CLASS="quote">Just read this quote from Inline Pro.

Just want to see if there is any truth to it.

I really do not want to blow up my fully built motor over faulty injectors..

"RC750's are injectors I would easily stay away from. The 750's if you read the box now, it says do not over pressurize past 42lbs of fuel pressure. If it goes past there, the inejctors will lock up, which I've seen on the injector dyno we have here".</TD></TR></TABLE>

How nice to hear such insight from Inline Pro after they tuned my car with a base pressure of 50 psi with the vacuum line connected! Amazing.

MeanGreenMachine

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

How nice to hear such insight from Inline Pro after they tuned my car with a base pressure of 50 psi with the vacuum line connected! Amazing. </TD></TR></TABLE>

inline pro bad at what they do?

non-VTEC

i dont have any issues with my rc750cc injectors......they see anywhere from 45-65psi depending on how much boost.

Sprockets

iTrader: (6)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MeanGreenMachine &raquo;</TD></TR><TR><TD CLASS="quote">inline pro bad at what they do?</TD></TR></TABLE>

Not all of them.

carrnut21

how about saturated 550's and 650's, any problems there?

TheShodan

iTrader: (14)

I've had over 45 sets of 750cc saturated injectors sent back to me after failure. This was all from a Mustang 5.0 Club as well as several import shops. I stay away from them w/ conviction.

MidwestAutoWorks

Fudge, im definately selling mine, im not spend 5grand on my motor setup just for some injectors to fubar them

MeanGreenMachine

man. the 750's seem like a hit and miss deal.

whats the secret to making them work and not lock up? 2 reputable tuners are saying that theyve used em with good success, others have had failure....

is it just a bad batch of injectors or something? too much fuel pressure? not keep em clean? what is it?

smoovy

WOW, this is not the first time I've heard of the RC 750cc injectors but Joe @ locash told me to not even bother with the resistor box and bigger injectors if I could get the RC 750cc saturated injectors for my build.

I guess he doesn't have a problem with using them???

honestly, if the RC injectors are not a good choice, why do so many people use them?

kuja

havn't had a problem with mine, but now i'm scared

NA_B18C1

crap! i have the 750cc too...how can i tell if it's peak/hold or saturated? HELP?

Tony the Tiger

Wow, what a surprise.. I did notice their sudden warning on their spec sheets more recently, and I was kinda nervous why they would have this warning. I have been using RC's for a long time, and I used to rape that **** to 90+ PSI when I was trying to squeeze out my old 550's, and did the same with my old 440's. Right now I am running the 750cc saturated, but they are running a base pressure of 60 psi + 18 PSI of boost reference since '06.

I guess it is the same for any MSD/Delphi/Precision injectors, which also have a warning stating to stay below 60 PSI. Time to run staged injectors for those 500+ WHP setups that still sees the street regularly.

Legion

One of the main benefits of peak/hold injectors is that the initial "peak" interval kicks the injectors open, allowing them to endure much higher rail pressures. That should be common knowledge by now. But then, most consumers are lazy and stupid, so spending an hour to install an injector driver is far beyond their level of willingness and ability. So they keep clambering for larger and larger saturated injectors until, guess what - your ECU can no longer deliver enough current to open your big clumsy high impedance solenoids.

Turns out you can't have your cake and eat it too. Who would have thought.

MeanGreenMachine

Does This lock up issue pertain to ONLY RC 750 SATURATED INJECTORS, or ANY brand and ANY CC saturated injectors? I know the topic of this thread is rc 750 saturated injectors, but are there any other brand saturated injectors that have had lock up issues besides RC?

Legion

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MeanGreenMachine &raquo;</TD></TR><TR><TD CLASS="quote">Does This lock up issue pertain to ONLY RC 750 SATURATED INJECTORS, or ANY brand and ANY CC saturated injectors?</TD></TR></TABLE>

Did you read my post? It happens with LARGE SATURATED injectors. It doesn't matter what the company is - you can't bypass Ohm's Law.

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MeanGreenMachine &raquo;</TD></TR><TR><TD CLASS="quote">Does This lock up issue pertain to ONLY RC 750 SATURATED INJECTORS, or ANY brand and ANY CC saturated injectors? I know the topic of this thread is rc 750 saturated injectors, but are there any other brand saturated injectors that have had lock up issues besides RC?</TD></TR></TABLE>


It's simply the saturated 750ccs that are having the problem. I have not had an issue w/ any of the low impedence (peak & hold) larger sizes, because the pintles were were not altered unlike the 750cc saturated. After doing an autopsy on the 750ccs that we received with our injector specialist, we found that these were altered from an original 42lbs/min pintle, so the life span of the injector was about a quarter of what it should have been, hence the reason for the warning about not having them over a certain base pressure.

Pompiuses

Read this link:
http://www.srtforums.com/forum...21841/

There're two versions of the rc 750cc saturated injectors ; SL4-0750H and SH4-0750H

SL4 has max 43.5psi fuel pressure, while SH4 has max 70psi. So if you've got SL4s you might be in trouble.

SL4-0750H = bad
SH4-0750H = good