Question about injector upgrades

[roplusbee]

Is anyone using 550cc injectors? And is it necessary to upgrade your fuel rail when going with bigger injectors? From what I have seen and read, it looks like the super sized injectors require fuel rail upgrades. I didn't think 550s were considered "large injectors".

Also, they should just drop in right (that is if they are new and I don't like the idea of used injectors). If not, an o-ring change may be the only change necessary, right? Thanks for putting up with me guys/girls. If this is a stupid question/post, feel free to blast away, but know that I am still searching even after I type this up.

Rob.

[teddy]

So long as they're top feed, low impedance injectors, and you use the CA18 o-rings, they should fit. I've heard of some people saying their SARD injectors didn't fit, but I think they were using the o-rings that came with the injectors.

[c-rad]

What kind of power are you looking to make? Anything under 400 and the stock fuel rail should be fine. Anything more than 400, why the CA?

[progman]

I run 550s in my CA. Stock fuel rail. I used the o-rings that came with my injectors (they were CA specific). no leaks.

i don't know if you know this or not, but you have to tune your ECU for the larger injectors. I don't recommend using an SAFC to adjust something this dramatic.

[roplusbee]

Roger that. I didn't think that 550s would be drastic for a CA, bt live and learn Thanx guys.

[themadscientist]

That's what almost a 50% jump in size? I wouldn't trust an SAFC to tune that big of a change. I replaced the 260s in my CA18DE with 370s and I was setting my SAFC to -25% at 8000rpms and still getting downshift fireballs out the muffler.

[progman]

50% ???

32.73% goss

[mazdaman]

That's what almost a 50% jump in size? I wouldn't trust an SAFC to tune that big of a change. I replaced the 260s in my CA18DE with 370s and I was setting my SAFC to -25% at 8000rpms and still getting downshift fireballs out the muffler

[themadscientist]

50% ???

32.73% goss

I am definately math challenged but a 550 is 180cc bigger than a 370 180ccs is 48.65% of 370cc sooo it's almost 50% bigger. Now if I am wrong please put up the equasion and help me out. My math teacher hated me, I blame her

[roplusbee]

Wow. Fireballs, huh? I am having an ECu chipped and tuned for 550cc injectors, 20psi (rebuilt SR turbo) max boost (prolly won't see that for a good while), and Z32 MAFS. I am not prepared to do any tuning myself, because I do not have replacements for all of my internals (yet). I plan to rebuild, but not at this time (as I am away too much, gotta love rapid deployment).

I really don't have a HP/TQ goal at this time. I just want to add some more guts to my car. Maybe I will be able to set a goal after I experience what the car can do with "simple" bolt on upgrades. Then I can get into strengthening the internals and such to go big like some of the folks on the forum and surpass the magic number (for some reason, I have 300HP in my mind as the magic number).

I guess, it is safe to assume that I should be getting a clutch kit soon, huh? I just don't like the fact that I have read so many posts/articles where people are complaining about SPEC clutches. Are they warranted or are these guys trying to apply a "minimum" spec part to kinda cut a corner?

[themadscientist]

When I get my subs loaded in I am shooting for 300 on mine with the stock longblock. I can't say one way or the other about the Spec clutches I have a twin, it WORKS

[ch187]

im using 450cc dsm injectors with ca o-rings. the stock fuel rail will be plenty big for any power goals. its already big...

[roplusbee]

Cool. FR-Sport only has Greddy top feeds listed at the moment, but I am kinda skeptical. I haven't heard anything about them. On the flip side, I haven't heard anything bad about Sard, but I haven't seen too many places to get them new. Guess I will just keep searching.

[c-rad]

Why not just get some Lucas/RC 550cc injectors for a DSM for like $210 brand new?

And as for the guy planning to run 20psi on his rebuilt SR T25, that's not going to happen. 14-15psi tops or you'll be rebuilding that turbo again in about 1k miles.

And for the mathematicians out there (or lake thereof) 1-(370/550)=0.32727272 ~ 33%. Either way, its too much for a SAFC.

SAFC should only be used for minute adjustments IMO regardless of what others say. Their car may run great, but its only because they are getting a lot of timing advance which is a ticking time bomb for a blown motor.

[roplusbee]

Right. I don't plan on running @ 20psi. I plan on running around 12psi by way of boost controller (electronic if I can afford it), I just wanted the max resolution on my ROM tune to be 20psi so that I have room for expansion once I get another turbo that can be handle high boost. Thanks for the concern though.

[mikesim]

Why not just get some Lucas/RC 550cc injectors for a DSM for like $210 brand new?

And as for the guy planning to run 20psi on his rebuilt SR T25, that's not going to happen. 14-15psi tops or you'll be rebuilding that turbo again in about 1k miles.

And for the mathematicians out there (or lake thereof) 1-(370/550)=0.32727272 ~ 33%. Either way, its too much for a SAFC.

SAFC should only be used for minute adjustments IMO regardless of what others say. Their car may run great, but its only because they are getting a lot of timing advance which is a ticking time bomb for a blown motor.

X2 about the S-AFC. you can't trust it to take out the timing, and with increased boost and fuel, you're looking at something that will never run as smooth as a ROM re-tune.

[DALAZ_68]

sorry for reviving this from the dead...but question

i found some 550cc from deatchwerks...but they only have RB topfeeds...

now ive crossreference numbers with Tomei inj for CA and Rb and show the same part # for 550's...

when i asked Detchwerks, they said they only had high Impedance for KAe and RB...

but i thought RB and CA were interchangable...

can anyone shine some light on this?

[beans33]

I have a freind who is running my stock injectors in his rb20 +2. I run evo 560's and they fit just fine.

[DALAZ_68]

ill take that as a yes...its doable...ill take my chances since im down to the wire...

[mbmbmb23]

sorry for reviving this from the dead...but question

i found some 550cc from deatchwerks...but they only have RB topfeeds...

now ive crossreference numbers with Tomei inj for CA and Rb and show the same part # for 550's...

when i asked Detchwerks, they said they only had high Impedance for KAe and RB...

but i thought RB and CA were interchangable...

can anyone shine some light on this?

RB20, RB26, GTi-R, Eclipse/Evo/Talon, Rx-7 FC purple tops, are top feed low impedence, same as the CA. RB25/VG30/KA/SR/etc. are side feed.

[float_6969]

This is correct.

[D_Stirls]

RB20 injectors well the ECCS ones (Not sure about the NICS versions) are high impedance, to use GTR injectors in them the have to wire in the GTR's dropping resistor as well.

EDIT!!
CA18de's are high impedance as well.

[DALAZ_68]

RB20 injectors well the ECCS ones (Not sure about the NICS versions) are high impedance, to use GTR injectors in them the have to wire in the GTR's dropping resistor as well.

EDIT!!
CA18de's are high impedance as well.

ok this just blew my plans out of the water...i need some 550cc Topfeeds for my engine dammit

[D_Stirls]

RB20 injectors well the ECCS ones (Not sure about the NICS versions) are high impedance, to use GTR injectors in them the have to wire in the GTR's dropping resistor as well.

EDIT!!
CA18de's are high impedance as well.

ok this just blew my plans out of the water...i need some 550cc Topfeeds for my engine dammit

What were you planning to do, if you want to use high impedance injectors you just need to bypass the dropping resistor.

[DALAZ_68]

What were you planning to do, if you want to use high impedance injectors you just need to bypass the dropping resistor.

S15 T28
N60 Maf
KAe TB
FMIC
nismo FPR
Nistune

and from what im told 550cc would be what i need to not stress anything out,looking for only 230 , stay within safe limits, to keep the turbo and motor runnin as long as possible

how would you go by bypassing the resistor?

[mbmbmb23]

Just get some Evo 560cc top feed low impedence and call it a day.

http://cgi.ebay.com/ebaymotors/Mitsubis ... ccessories

[DALAZ_68]

i would, but wouldnt i need plugs? are Evo inj consistent?

[DALAZ_68]

i would, but wouldnt i need plugs? are Evo inj consistent?

i actually found these...
http://zilvia.net/f/sale-items/324525-f ... ctors.html

but i only need 4...lol

[ser20det]

i would, but wouldnt i need plugs? are Evo inj consistent?

i actually found these...
http://zilvia.net/f/sale-items/324525-f ... ctors.html

but i only need 4...lol

I just Got my set of evo 560cc... Just get them cleaned and checked before u install them... I thing they need the proper ca18 o'ring

Those are suppose to be bolt on for the plug ... look the same as my 370cc

[DALAZ_68]

I just Got my set of evo 560cc... Just get them cleaned and checked before u install them... I thing they need the proper ca18 o'ring

Those are suppose to be bolt on for the plug ... look the same as my 370cc

sweet...im waiting on word from my mech, he might have a lead on some...

so pretty much i dont need to worry about plugs, thats saves me some time and money...