Rx7 Injectors In Rb25? Or Similar

[Evasion]

Hi

I'm putting this up for a mate he has a r33 rb25det. now at the moment hes running out fo fuel due to stock injectors, has power fc supporting mods blah blah blah.

Now I know that s15 injectors fit into the rb25, some people on here prob use them think there 440cc.

But one thing from memory is that people with s13/14/15 can use rx7 injectors as they fit the sr and provide an extra gain going to 550cc, so my question is.

Can the rx7 injectors (550cc) work on a rb25det, do they have the same impedence, or is there another cheapish upgrade out there

Any help muchly appreciated,

Thanks all

[paulr33]

yeah ive read you can use rx7 injectors which are 550cc (ish)

but youll need to find 6 of them of course. its probably easier and cheaper to just buy a set of 6 injectors instead of 4 and then 2. also s15 manual jdm injectors are in the similiar boat, but are 480cc.

[Mr. Oizo]

1984 - 1992 wont fit a rb25

1993 they changed to side feed, so maybe..?

[BHDave]

series 6 and later will fit, but you need to swap the plug to suit the denso plug.

They aren't as cheap or as easy to come by as the earlier s4/5 injectors though

[darrinspencer]

You need the series 6 "primary" injectors from memory

The secondary injectors are higher flow again

Since there is only 2 primary injectors in a 13B, you need to find 3 sets, which is not easy

I think the WRX boys want them too

I went thru this a while ago, and ended up getting S15 injectors

There has been much debate whether they are 440/448 or 480cc

On NS.com, the majority say they are the lower 440cc, not the 480cc

[The Dan]

Do half a job and you will get half as good a result.

RX7 injectors are very unreliable. Especially the S4/5 ones. They only operate effectively to a duty cycle of 60%.

A set of sard 550cc injectors you can get for $750 delivered to your door. Why would you mess around with anything less?