infulleffect

First off thanks for taking the time to look here. I recently installed some RC-750 injectors and after words my car started and then choked out. I pulled the plugs and they were dripping with fuel. I checked fuel pressure, the IAT, ecu map, etc. and found that when I restricted the fuel pressure by using a visegrip on the fuel feed line the car would run fine with the 750's. Upon removing the visegrips the car would drown itself out again .
I then took some SAAB 900 16V injectors I had floating around and put them in. First turn the car started and kept a clean idle...that would be the SAAB injectors, the Walbro 255 pump, and the P28 set to run 750 injectors.
I am left with the thought that my injectors may have a problem. They are new, and RC has offered to take a peek at them free of charge...I guess I am more curious to know if anyone has heard of or had any problems with the RC injectors flooding their car?
Thanks again and any info is appreciated.

notoriousB

I'm running RC 750s and don't have any problems with flooding or idle. At first I figured your fuel pressure just needs to be turned down but then I read this:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by infulleffect &raquo;</TD></TR><TR><TD CLASS="quote">First turn the car started and kept a clean idle...that would be the SAAB injectors, the albro 255 pump, and the P28 set to run 750 injectors.</TD></TR></TABLE>

So you installed Saab injectors and the car runs correctly with the ECU set up for 750cc injectors?? I'm sure saab injectors are not 750cc, you should be running lean as hell right now. Are you sure the ECU is set up correctly?

infulleffect

Thanks for the response...the car may be lean, I should clarify...I have not driven the car. When I say "fine" I was meaning that it starts instantly and idles. I have tried two different basemaps that have been successful in other cars and the same result with the RC injectors...the fact that the SAAB injectors actually start the car is puzzling due to the fact that they are far from 750cc. I slowly did rev the car up to about 4K and the SAAB injectors are tapped and begin to break apart something firece.

crucian

What compute engine management are you running? Did you try taking out fuel out of your map. Take out as much fuel needed to make it run right. I think it's a tuning issue.

infulleffect

Its a Neptune ecu...we have tried that twice now....I guess we can remove some more. It just seems odd that we used two base maps that have started other cars already...I am sure we can try again.

crucian

don't worry about what another car does. Give your car what it needs. My friend's car have different needs from mines and we basically have the same setup. So when I tune both cars, I start from scratch on each. Good luck!

Turbo-charged

i have used tons and tons of rc injectors, and especially the 750's. the only problems ive ever had (on 3 injectors) is that they would leak from the body of the injector, which obviously meant i needed to send them back and have them replaced. other than that, ive used tons of 750's with no problems, and actually have a set in my daily driver right now.

the hondata basemap i made idled the car at 14.0 air fuel right off the bat

infulleffect

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">i have used tons and tons of rc injectors, and especially the 750's. the only problems ive ever had (on 3 injectors) is that they would leak from the body of the injector, which obviously meant i needed to send them back and have them replaced. other than that, ive used tons of 750's with no problems, and actually have a set in my daily driver right now.</TD></TR></TABLE>

That is comforting...mine are not leaking and I know RC is a reputable company...I have used some of their other injectors without any problems previously, this would be a first. I guess we will have to take more fuel out and see what we come up with.
Thanks for all the input...I am feeling less puzzled

Turbo-charged

i did a car a few weeks ago...i cant remember if it had 750's or 1000's in it....but it was wayyyy off on the basemap. i thought something was wrong too. after some tinkering around with the program i was able to get it back in check.

infulleffect

fair enough...I guess we will try again and see what happens. Many thanks...I actually was going to a FI place local here and have the RC's flowed to make sure they are OK...

slooogsr

if your plugs were soaked with fuel i would definitely look into changing you oil just in case you washed the cylinder walls with fuel........

you guys that are running 750cc sat. injectors, what are your power goals? why do people opt for the peak and hold instead?

im debating which ones to go with because im only looking for 350-375 max hp with my build........ and if i dont have to wire in a resistor box i wont........

infulleffect

I didn't try long enough to wash the cylinders...thanks for the tip though, my oil is still smelling oily
I went with the 750's since my goal was 300+ and they give me room to grow and no resistor box required.

slooogsr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by infulleffect &raquo;</TD></TR><TR><TD CLASS="quote">I didn't try long enough to wash the cylinders...thanks for the tip though, my oil is still smelling oily
I went with the 750's since my goal was 300+ and they give me room to grow and no resistor box required.</TD></TR></TABLE>

excellent, i may have to just go with those.........

crucian

I would say 650cc will be good enough. I was running them forever in my car on 40psi fuel pressure. and car still wanted to run rich. I don't know how much power the car has, but I beat all kinds of cars claiming to have 300 and 400+ horsepower. Well here in Germany you get a chance to really push your car. Porsches and M3s are jokes. I just show them tail lights everytime. Remember the higher you go in size, the harder it might be to idle. Good luck!

FactionR

im running 750's and it a few miutes to get it idle with my basemap on my s300. it actually needed quite a bit more fuel, or really pulse as it takes more time for such a large injector to open and shut.
anyways im only gunning for 400whp max and i still went with 750's. they are the largest you can go on saturated injector sizing and you will never run out of fuel. they will suport up to 475+whp im sure, but a lower duty cycle injector is going to be happier than one that is close to maxing out. my .02 cents

infulleffect

Well I got my injectors back from RC yesterday and there was one that was sticking, and another that was intermittently sticking...my luck I guess...well put them in, the car started on the first turn and then...choked out .

The Saab injectors run the car, its lean...but the car will start. Is there any sensors that could be bad and I wouldn't have noticed it with the stock injectors?

I checked the IAT sensor and the volts reading turned out to be correct reading for the temperature.

I am wondering if I am having a cold start issue with having these larger injectors installed.

Any thoughts, I'm at a loss.

infulleffect

no ideas???

Mase

the car needs to be tuned. thats the problem.


basemaps dont always work.

tony1

Is the map sensor wired right?

Mase

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Is the map sensor wired right?</TD></TR></TABLE>

exactly, is the basemap even setup for the right map sensor?

infulleffect

Trust me I am planning on a tune...the basemap I got from my tuner so I can get there to be tuned. I am using the stock map sensor, so there was no change there. This particular basemap has worked on many other cars that is the confusing part ...I guess we need to try again.
Thanks

Blackack26

I'm also using RC750 saturated injectors and the basemap I made for 750's was wayy off, it was running really lean at idle. Basemaps suck, but anyway, i've never had a problem with the injectors. I'm using s200 if that matters

Tchleung

lol I had the same problem as a few of the guys here.. ran RC 750's and on first startup on the basemap I made. it was SO lean it couldn't idle. we're talknig 18:1 to 19:1 I had to add a shitload of fuel in compared to the basemap. I think I ended up upping the pulsewidth by 200%. I just watched my A/F guage and kept adding(or taking away in your case) fuel util it finally started to do something Adjusting by 15% increments

infulleffect

Thanks for the input, I will look into those options.

infulleffect

UPDATE

I sourced some older integra LS injectors and put my stock ecu in and the car started instantly, and idles perfectly with my timing at 16 degrees. It won't handle boost, but runs like it should This way I can atleast get it to my tuner when the time comes to see what is going on with my whole set up.