What size injectors have i got?

[Steg33]

G'day guys. Just wondering if anyone can tell me what sized injectors i've got on my 95' R33. I've had the car for a few months and am still finding new things under the bonnet.

The injectors are Denso, part number 1995500-2240 and have a pink head on them. Any idea how many cc's are these??

I've also got a mate that wants to know what colour stock R33 injectors are (his are purple) and even a part number if possible?

Any help's appreciated.

Thanks

[Steg33]

Sorry, small mistake.

The part number's 195500-2240

Only one 9

[L 33]

I've also got purple injectors. What's the go with these? Are they stock or not for an R33?

[boli]

Steg 33,

Try this site below for injector info

http://www.ap-engineering.co.jp/el/inj_side.htm

195500-2240 = ND/SARD 550cc SR20DET 14.0ohm injectors (Injector number 5 on the list).

boli

[Steve]

handy link boli, cheers

[Steg33]

Thanks for the reply boli, i ended up finding that site just after i posted this.

I'm guessing the ND stands for Nippon Denso and they must be the same make as the sard ones.

The only thing is, i've got an RB25DET and they're stated for the SR20DET. I'm assuming my fuel rail takes the same injectors as the SR20DET?

Has anyone else heard of these Denso 550cc injectors or can confirm that they are 550cc? I've got my motor going in for a rebuild and was hoping i wouldn't have to upgrade when i put a bigger turbo on (GT2835 or GT3040).

[Zombie]

If you motor is going in for a rebuild maybe take out the injectors and have them cleaned and flow tested? That way you will know for sure.

Adam

[Steve]

Yes, they are same for SR20 and RB25 - I had to pay for mine though, $1K including collars, so you got a bit of a bonus there.

I could probably send you a photo of mine (fitted), but I cant work out how to post up pics here:)

[R31Nismoid]

Have you still got the stock ECU?

Can a stock RB25 ECU run bigger injectors without going mental?

[benm]

good question.... ?

[Steve]

bigger injectors would result in overfueling without changing the maps.

[Zombie]

Another question is would injectors from an s15 jdm or aus 200sx fit in an rb25? They are both side feed high impendance. Apparently they are 440cc or 480cc but I havent found out for sure.

[Steve]

SR20DET and RB25DET use the same fit and impedance injector. If you check the link above, it will tell you what size injectors they are.

[Zombie]

Interesting, so a s15 sr20 injector would go straight in?

What sort of power would a 440 or a 480cc injector make?

I remember some sort of formula around, but cant find it.

Adam

[Steve]

For 6 cyl, roughly cc of the injector equates to bhp, so 440cc roughly 440bhp.

[Steg33]

Nismoid and Ben, i've still got the factory ECU but it's been reburnt so the fuel settings shouldn't be too bad. Can't usually run bigger injectors without some sort of remapping. Current is reduced so they don't pulse so hard. My car does run a little rich but not to the extent that oversized injectors on a stock ECU would be. The car was from Japan with a heap of mods. The motor's just s**t itself because there must have been a huge turbo on it before they sold it (was a smaller than stock turbo when i got it, R31 i think). Going in for the rebuild at the moment.

[Steg33]

Steve, it should be possible to get more power out of those 440cc injectors with a fuel pressure regulator or larger pump shouldn't it?

[Steve]

absolutely, it is a rough guide only, not taking into account changing the rail fuel pressure.

[whatsisname]

When upgrading my injectors I did a little research into the JDM/OZ spec S15 injector issue. Unley Nissan here in Adelaide (known to be 'import friendly' dealers) couldn't give me an answer as to whether the JDM & OZ S15 injectors were the same (I'm sure someone on SAU knows) APS in Melbourne would know as they highflow the stock OZ S15 injectors as part of their JR (?) kits. 6 new S15 injectors from Nissan Aust are more than 1k!

Boli,

As Steve said, excellent link mate!

Steg33,

If you look at the site Boli posted you can see in the 3rd & 4th columns in from the right it gives you cc rating at higher fuel pressures, i.e take the top injector (stock RB25DET/SR20DET) at 3.55kgcm2 of fuel pressure the 370cc injector will flow 440cc. This is how stock RB25DET injectors can support quite large gains in hp. Pushing injectors beyond their rated capacity (via a reg) is not wise unless the fuel pump is able to cope with the increase load placed on it.

EDIT: It's also interesting they list what appears to be the minimum duty cycle (milliseconds 0.69 etc...) achieveable depending on the fuel pressure used.

[Steg33]

Not a problem Whatsisname, i was having some trouble reading the Japanese.

Thanks