Rb25 Injector Upgrade

[sriver killer]

hey guys

i've got an r33 rb25et

i am looking at getting a nistune in the near future. with either a rb25 highflow or atr43 (hypergear direct bolt up)

i've already got all supporting mods, bosch 040, z32 afm, , fmic, 3.5 inch turbo back, splitfires

i'm tossing up with either getting a set of s15 injectors (480 cc i think )?

or sr n/a highflows (700cc)

i think that the s15 injectors would have a better spray pattern, and keep my economy down a bit?

i haven;t heard too much about the highflowed injectors, is anyone using them?

just want people's opinions about both of these injectors

do the high flowed injectors have a bad spray pattern? they might be a bit overkill for my application

cheers

[paulr33]

s15 injectors are around 480cc (turbo manual) and you want highflow them to 700cc? are you sure?

i dont see why you would bother and risk it with crap highflows? wouldnt it be easier to get drop in nismo 550cc's ?

[.WILKO.]

If you dont need to go to 700cc dont. if you go to high u end up with idling problems etc.. 550cc would be more than enough.

[sriver killer]

they were just too options that i was tossing up with,

idle problems eh. prob better to go the s15 injectors or nismo 550cc.

has anyone had any problems with economy at cruising speeds with these injectors?

[paulr33]

if tuned correctly, nope

[geraus]

I'm using 740cc highflow's and they run sweet oh and a hypergear highflow

[ryan101]

How much are the nismo 550cc injecters?? or as a cheap upgrade would the rb26dett injecters be better then stock? my next question is should you upgrage injecters just before you go for a tune or can you put them in without a tune!

i am just thinken of the near future!

[ryan101]

How much are the nismo 550cc injecters?? or as a cheap upgrade would the rb26dett injecters be better then stock? my next question is should you upgrage injecters just before you go for a tune or can you put them in without a tune!

i am just thinken of the near future!

[JonnoHR31]

nismo 555s are usually around 800-1000 for a set.

26 are top feed, 25 are side feed, no can do.

change them just before a tune, what ecu do you have?

[ryan101]

nismo 555s are usually around 800-1000 for a set.

26 are top feed, 25 are side feed, no can do.

change them just before a tune, what ecu do you have?

i have a rb25det s2 ecu, is there a cheaper option other then the nismo 550cc?

[sriver killer]

talk about a thread hijack haha

yer the high flows don;t sound too bad. i'm gonna price up some s15 injectors on monday

[bradsm87]

OK so high flows can be dodgy yes.

Why don't you just go with the S15 injectors? They should be good for 300rwkw.

[ryan101]

sorry bout that, didn't want to start a new topic on the same thing

[JonnoHR31]

i have a rb25det s2 ecu, is there a cheaper option other then the nismo 550cc?

you cant run bigger injectors on a standard ecu. if your planning to get it chipped or nistuned then do it all at the same time. if you get something like a power fc you can change them whenever you like and change the injector settings

[geraus]

how are highflows dodgy? im running 740cc with good power on my power fc... i havnt had any problems for over a year now.. explain bro?

[TRB-001]

may be a stoopid question, but what is the cheapest way of buying 6 x s15 injectors seeing as they come in sets of 4.

and usually ppl want seperate.??

or are u planning on buying 6 new oneS?

[mattymagoo22]

I've got 2 s15 injectors sitting at mums in her garage pm if interested, located toongabbie sydney NSW cheers Matt.

[Dose Pipe Sutututu]

just watch out on NS.com buy 2x sets of 4s

I've seen them go for like $200 for all 4

People with idle problems with larger injectors are usually caused by bad tunes & or injector settings, my car idles on stoich, cruises on stoich, and I get around 400km to a tank city driving @1.bar boost the best I've got was like 520km from full to fuel light.

[HEKT1K]

may be a stoopid question, but what is the cheapest way of buying 6 x s15 injectors seeing as they come in sets of 4.

and usually ppl want seperate.??

or are u planning on buying 6 new oneS?

buy 3 sets, and sell the spare 6 to someone else

[Tangles]

I bought 2 sets of 4 S15 injectors off ebay for $450 all up

so Ive got 2 spare; grab a set of 4 for $250 and pm me for these 2 . . .

the 450/480cc s15 injectors work a treat on a midly modified engine (ie same mods)

currently awaiting a set of 550cc siemens rb26dett injectors from ebay, $360 new delivered.

(for my track car)