fuel injectors

Post by **robyc** » Sun Apr 06, 2003 7:40 pm

for those with a sr, what fuel injectors are you using?

Post by **pampadori** » Sun Apr 06, 2003 7:40 pm

msd 50lbs. going to 72 lbs in my other 240sx. shaun

Post by **BuudWeizErr** » Sun Apr 06, 2003 7:40 pm

370's

Post by **Onizuka** » Sun Apr 06, 2003 7:40 pm

nothin special about stock buud

BTW, does it require fuel management tuning if i want to run 480cc or posibly 550cc injectors besides a fuel pressure reg. and fuel pump???

sorry for the thread jack! :icesangel

Post by **BuudWeizErr** » Sun Apr 06, 2003 7:40 pm

J-Spec Tuner wrote:nothin special about stock buud

Says you. I know a lot of slower cars that would kill for some 370's.. hehehe.

:pface

Post by **ItzGenX** » Sun Apr 06, 2003 7:40 pm

Quote »if i want to run 480cc or posibly 550cc injectors besides a fuel pressure reg. and fuel pump???[/quote]

You would need some sort of piggy back fuel computer or programmable ecu.

Post by **robyc** » Sun Apr 06, 2003 7:40 pm

good one buud.

Post by **pampadori** » Sun Apr 06, 2003 7:40 pm

NISSAN says you can use injectors upto 15% larger without any mods. shaun

Post by **burgy240** » Sun Apr 06, 2003 7:40 pm

15%....thats to much math....hehehe anyway, I'm running stock for now but as soon as I upgrade turbo's I'll be using TTsupra injectors.

Post by **hokiruu** » Sun Apr 06, 2003 7:40 pm

I just bought a Tomei fuel pump, rated to 500hp for my upcoming SR swap. According to Sam at JSpec, its a direct replacement. Do you think this will work on the stock SR ECU program or will I need a retune? Oh, and sorry for the threat jack. To make it a little relevant, would it be healthy to run 550cc injectors on an otherwise stock SR? Obviously using some sort of fuel management.

Post by **pampadori** » Sun Apr 06, 2003 7:40 pm

your fuel pump will be fine without any other mods. i believe its similiar to the walbro (holly) fp. the regulator takes care of returning the extra fuel to the tank. with proper fuel management, any injector is ok to use. 550 injectors usually don't need anything, but larger and they usually need a resistor on each injector or the ecu driver gets hotter and fries in some cases. not to mention it won't run well.shaun

Post by **NeedCAforS13** » Sun Apr 06, 2003 7:40 pm

15% over 370cc is 425.5cc, so i would imagine you could use skyline 444cc injectors w/o any problems..right?

Sean

*whoops i forgot to mention i have a ca18det, not an sr20..just looked at the heading...oh well

Post by **RHDS14** » Sun Apr 06, 2003 7:40 pm

Does anyone know if the SR injectors are high or low impedence. I am swapping to the 444 GTR injectors and need to know this.

Post by **robyc** » Sun Apr 06, 2003 7:40 pm

so what does the stock fuel pump flow? the walbro, and similar replacements, flow around 255 lt/hr.

would it be good to have different fuel rail for 550cc injectors?

what fuel rails are available?

Post by **Onizuka** » Sun Apr 06, 2003 7:40 pm

arnt GTR injectors top feed??

Post by **achilles0t** » Sun Apr 06, 2003 7:40 pm

if you have the proper gauges to moniter your car you wont need a new fuel rail till you hit at least 450. my buddy has 555cc inj with a safc /car runs sweet

Post by **themadscientist** » Sun Apr 06, 2003 7:40 pm

J-Spec Tuner wrote:arnt GTR injectors top feed??

yes

Post by **robyc** » Sun Apr 06, 2003 7:40 pm

achilles0t, are you meaning 450 hp in last post for updating fuel rail?

Post by **Onizuka** » Sun Apr 06, 2003 7:40 pm

themadscientist wrote:yes

Well then how in the hell are you supposed to use skyline 444cc injectors on the SR20 without modification?

Post by **60dash1** » Sun Apr 06, 2003 7:40 pm

sr injectors are high impediance saturated type.

Post by **Silviagirl79** » Sun Apr 06, 2003 7:40 pm

J-Spec Tuner wrote:Well then how in the hell are you supposed to use skyline 444cc injectors on the SR20 without modification?

you're right you cant use top feed injectors, since the RWD Sr20det uses only side feed.

Post by **I H8 UR DSM** » Sun Apr 06, 2003 7:40 pm

just get a different fuel rail

Post by **60dash1** » Sun Apr 06, 2003 7:40 pm

I H8 UR DSM wrote:just get a different fuel rail

exactly.

Post by **Onizuka** » Sun Apr 06, 2003 7:40 pm

you make it sound so easy....

Post by **hokiruu** » Sun Apr 06, 2003 7:40 pm

I'm reviving an old thread here, sorry of that bothers anyone. In order to run 550cc injectors, what do you actully have to do with an S-AFC or S AFR? I mean how do you use it to make larger injectors run? just add the fuel increase percentage as much as possible? I have an s14 SR, the turbo is good to about 14psi, but the injectors are only good to 10 on this turbo (so I'm told) so naturally I want bigger injectors, but $500 is a big chunk of change for a retuned ECU. Is trial and error with 550's and one of the aforemetioned piggyback fuel controllers really dangerous? I'd be a little worried about damging the engine while trying to get the 550's to work. Or is it really not that hard?

Post by **I H8 UR DSM** » Sun Apr 06, 2003 7:40 pm

It would be more of the opposite...the larger injectors flow more, therefor you would lean out the afc, not increase the fuel flow, ya know what i mean?

Dont do a retune, either buy a tuned ecu from japan, but i would stick w/ the SAFC. affordable and good

Post by **I H8 UR DSM** » Sun Apr 06, 2003 7:40 pm

oh, and we dont mind!!! u searched!

Post by **hokiruu** » Sun Apr 06, 2003 7:40 pm

Thanks Jesse. Do you have any connections for used reprogrammed ECU's? Sam at Jspec and Japandy on ebay used to have them pretty often, but seems they harder to come by lately. So you favor the SAFC over SAFR in this case? Why? I would love to have a Power FC Dejetro, but I don't know how to use one and neiter does anyone else around me, plus i really can't afford one. I'm just looking for a poor boy's way to safely squeeze a few more psi out of my turbo, as 10psi is def. NOT the top of its efficiency.

Post by **vangj** » Sun Apr 06, 2003 7:40 pm

I have question for you guys... I currently have stock turbo, FMIC, Profec B, stock injectors, stock fuel pump, and other general exhaust stuff. I wanted to upgrade to 555cc's, a Walbro fuel pump, and an SAFC. I've been reading this posting and people have different opinions, but will the 555cc's work fine with my setup. I have a Mine's tuned ECU that I bought from J-Spec. They told me that it was made for the stock setup, but I don't know exactly. Will these items work fine together??

Another question, My car has idle problems. If I unplugg the o2 sensor, it idles a little better. It idles really bad when it's plugged in. Will those items help me out also with my idling problem?

Post by **MojoMan** » Sun Apr 06, 2003 7:40 pm

You need to verify the program on the daughter board of the ecu and make sure it is compatible with your set up such as maf. What maf is it programmed for? Have you checked your maf to make sure its good. Are your injectors good? Maybe bad o-rings??? There are too many things it could be. You need to take it to someone thats familiar with the motor. I believe in another post you said the o2 sensor was new and from an 87 300zx. Are your plugs fowling out? What do they look like? Are they gaped right? Apearently its running rich. I know how it is to drive without the o2 plugged up. It runs off of the base map on the ecu by running in open loop. How is your fuel pressure and how much?

fuel injectors

fuel injectors

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