im going GSR turbo
-stock sleeves 81.5mm bore
-9.0:1 CP Pistons
-Eagle Rods
-Stock Ignition
-Stock Fuel Rail and Stock Fuel Pressure Regulator
-Walbro 255lph high pressure fuel pump
-Dyno Tune on Crome Pro
-looking up to 350whp (stock sleeves)

i was gunna get 440cc injectors then had some friends recommend 550cc injectors and now im considering some 750cc injectors. i want to get the biggest injectors in case i decide to upgrade for more power (resleeve and push up to 500). ive heard that the RC 750cc Saturated injectors are good up to 500+ whp.

1.) now, will CromePro control these injectors to produce a perfect idle?
2.) is 750cc too big?? and should i just stick with 550 or even consider 650?
3.) how well will these injectors along with my Walbro fuel pump work with a stock fuel rail and stock fuel pressure regulator?
4.) should i consider peak and hold injectors?

more questions might be added for my decision to purchase these injectors, thanks for the help!

 

they will be fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM turbo DC &raquo;</TD></TR><TR><TD CLASS="quote">4.) should i consider peak and hold injectors?
</TD></TR></TABLE>


I would.

 

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


I would.</TD></TR></TABLE>

x2

There is a reason RC is the only company that makes a 750cc Saturaed injector. If you plan to upgrade the sleeves later on, then go with 750cc Peak & Hold.

 

How comes a big saturated injector is not a good ide?

 

I used to run 550 saturated and now run 750 saturated rc's the idle is a little bit rougher in the extremely cold weather (while warming up for the first 10 to 20 seconds) with the 750's but that is about the only downfall for me.
Been running them @ 350-400whp for 30k miles now daily driven...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by markaria &raquo;</TD></TR><TR><TD CLASS="quote">I used to run 550 saturated and now run 750 saturated rc's the idle is a little bit rougher in the extremely cold weather (while warming up for the first 10 to 20 seconds) with the 750's but that is about the only downfall for me.
Been running them @ 350-400whp for 30k miles now daily driven...
</TD></TR></TABLE>

what kind of motor you running?? stock sleeves?? how cold was the weather when u started ur car?? i live in socal so it doesnt get that cold out here.

 

ive used the 750's often, and never had a single problem with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">ive used the 750's often, and never had a single problem with it.

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

Mase tuned my RC750's, idles and drives like stock.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 11psiTurboSI &raquo;</TD></TR><TR><TD CLASS="quote">

Mase tuned my RC750's, idles and drives like stock.</TD></TR></TABLE>

Saturated or Peak and Hold??

 

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

Saturated or Peak and Hold??</TD></TR></TABLE>

Saturated are the only way they come in 750cc.

 

i'm running the the rc750's...walbro 255hp...aem rail and filter...b&m regulator....idles perfect works great...i'm sitting and 350whp at 16psi...it's a daily

 

I've been running the RC 750's for a while in my daily driver, they work great, idles better than stock, no problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lucidvtec &raquo;</TD></TR><TR><TD CLASS="quote">i'm running the the rc750's...walbro 255hp...aem rail and filter...b&m regulator....idles perfect works great...i'm sitting and 350whp at 16psi...it's a daily</TD></TR></TABLE>

well im thinkin of getting both the injectors and fuel pump. how well will it work with a stock fuel rail and stock fuel pressure regulator?

u running stock sleeves?? what bore??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rmcdaniels &raquo;</TD></TR><TR><TD CLASS="quote">I've been running the RC 750's for a while in my daily driver, they work great, idles better than stock, no problems.</TD></TR></TABLE>

you can have an idle better than stock?? thats interesting haha

 

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

you can have an idle better than stock?? thats interesting haha</TD></TR></TABLE>

That might have something to do with my Tony1 Hall Effect ignition setup. JDogg says it's easier to make it idle right because the ignition trigger signal is much cleaner and more consistent than what comes out of a Honda distributor.

 

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

That might have something to do with my Tony1 Hall Effect ignition setup. JDogg says it's easier to make it idle right because the ignition trigger signal is much cleaner and more consistent than what comes out of a Honda distributor.</TD></TR></TABLE>

very interesting...

 

I've been running RC750's saturated for a while now. My tuner said he had no problem tuning the car with them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The sweed &raquo;</TD></TR><TR><TD CLASS="quote">How comes a big saturated injector is not a good ide?</TD></TR></TABLE>


Peak/Hold &gt; Saturated.

Saturated injectors are cheaper to manufacture, hence their overwhelming OEM presence. Peak/hold are more complicated (and more expensive to manufacture) which is why they are usually only available in aftermarket applications.

It comes down to this: Peak/hold injectors fire faster than saturated injectors. When you need a high flowing injector (such as 750cc) it usually means you're making a lot of power which also means you have a high revving motor. With a high revving motor, the last thing you want is a slow injector.

Peak/hold are just more stable at higher flow. They can also operate under higher fuel pressure. The only "pro" I can think of for saturated injectors is that they run cooler and will ultimately last longer (again, hence the overwhelming OEM presence).

 

peak and hold injectors are better than saturated ONLY if you have a proper peak/hold driver.

nearly every ecu uses saturated drivers, therefore you need to run a saturated injector to have proper control

the 750's work really good, but make sure to keep the pressure low. We recently had a set that was locking up at 60psi fuel pressure, RC then told us that they were only rated for 70psi max, after that they arent strong enough to open against the pressure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">peak and hold injectors are better than saturated ONLY if you have a proper peak/hold driver.

nearly every ecu uses saturated drivers, therefore you need to run a saturated injector to have proper control

the 750's work really good, but make sure to keep the pressure low. We recently had a set that was locking up at 60psi fuel pressure, RC then told us that they were only rated for 70psi max, after that they arent strong enough to open against the pressure.</TD></TR></TABLE>

well im getting the walbro 255lph intank fuel pump, so i shouldnt get the high pressure one then??

 

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


Peak/Hold &gt; Saturated.

Saturated injectors are cheaper to manufacture, hence their overwhelming OEM presence. Peak/hold are more complicated (and more expensive to manufacture) which is why they are usually only available in aftermarket applications.

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

look at pretty much any import that comes with a turbo stock and you tell me that they are saturated...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">

look at pretty much any import that comes with a turbo stock and you tell me that they are saturated...</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM turbo DC &raquo;</TD></TR><TR><TD CLASS="quote">well im getting the walbro 255lph intank fuel pump, so i shouldnt get the high pressure one then??</TD></TR></TABLE>

get the high pressure, but dont run the fuel pressure over 70psi

 

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

get the high pressure, but dont run the fuel pressure over 70psi</TD></TR></TABLE>

thanks for the tip