Injectors - RB20DET

[TokyoTaxi]

Good God I'm confused now !!!

Every time I talk to someone new I get told something different. I'd pull my hair out but I don't have any

People are talking about different coloured tops of injectors being different flow rates within certain types of injector categories now.

If I could just figure out exactly what to use to try to get around 220 - 230rwkw from my stock RB20DET engine, with chipped ECU, FMIC and a GT2530 running 1.2bar while maintaining a respectable fuel economy, I'd be as happy as a pig in $hit.

[Roy]

RX7 injectors depending on year had different impedences, but were all 550cc.

When talking to the wrecker/shop whatever, tell them you are after high impedence RX7 Series V injectors. Use a multimeter (dont have one borrow one/you can borrow mine) and measure the impedence to be sure.

Then it is probably wise to have them cleaned and lfow tested, at which time if you dont want to put new plugs on them yourslef, then have this done at the same time by the people flow cleaning/flow testing.

[TokyoTaxi]

Thanks Roy,

I think I'll check the resistance of my injectors for peace of mind as you suggested. I'm just wonder about the CC's. Do you ( or anyone else that's replied ) think that 550cc's might be too much for my set-up ( Refer Post #21 ) ?

I'm only interested in good clean, safe power out of the car. Have no interest in blowing flames out the back etc.

[Roy]

Im going to be using 550cc Mazda injectors onmy RB20

i may not need injectors this big, but having some redundancy in the fuel system cant hurt. (Provided the ECU can handle larger injetors there isnt really an issue with 550cc being too much)

People dont seem to have a problem running these size injectors with factory (rechipped) computer. Injectors will only do what the ECU tells them to do.

[TokyoTaxi]

True.

I'm starting to see the picture a bit clearer now that I've just finished putting some basics down on paper.

If the standards are 270cc but can flow ( in my case they must be ) around 330cc then what would be required for another 20-30rwkw should be about 480cc. So, having around 70cc + in reserve is not so bad. ( Do not quote me on these numbers as they are based upon a perfect guestimate ).

I was just told that the Injectors in an SR20 fitted in a GTi-R are 440cc standard so....550cc for a 2ltr can't be that bad !

[SlowGTS-t]

Fat32, for 220-240rwkw, get a set of GTR~444cc ones. Dont forget they are low impedance.

Im aiming for just under 200rwkw so Ca18DET ones will do me fine. I managed to find another set, so Im pretty chuffed.

All up er.. sounds like about $50 for two sets. Now I just have to pay to get them clean and flowed.

[TokyoTaxi]

SlowGTS-t, I've decided that I'll go for whatever plugs straight in without any other mods being required and shoot for something between 450cc and 500cc if I can, as this seems to be the only span that everyone can agree upon ( out of the 16 people I've talked to about this issue ). By this weekend I'll have something to stick in my car one way or another !

Nice score on the bargain basement buy of the CA18 injectors !

I must say, it is very considerate of nissan to allow all these parts to be shared amoungst all the different models

[TokyoTaxi]

Sydneykid,

Do you know how the Series 5 RX7 Turbo injectors hook up to the fuel rail on an RB20 ? I've been told by AFI that the Mazda ones are "O" Ring fitment, but the RB20 ones are a barbed press on hose deal. If this is true I'll need a different fuel rail.

[SlowGTS-t]

Ca18DET ones plug straight in, no mods whatsoever er.. except for the damned resistors. Probably good to around 200rwkw.

Dunno about the plug on RB26DETT ones (~444cc) but these would be the go for ~230rwkw. (also low impedance unfortunately)

Sydneykid, a bigger fuel pump shouldnt really give any more pressure but I guess you mean bigger pump and more fuel pressure?

[TokyoTaxi]

Actually, I'm producing 201rwkw at the moment using stock injectors ( not maxing out ), GT-R Fuel Pump and a NISMO Fuel Pressure Regulator so.........I would have to think that CA18DET Injectors, being 100cc's ( nearly one third ) more flow might accomodate 230rwkw !?!?

So you do need a resistor/s for CA18DET ones ?

I thought they were High Impedance/resistance ones like the RB20DET..........( scratches head ).

So how is the resisitor/s hooked into the system ?

[Sydneykid]

GTR Injectors fit CA18s, not RB20/25s. thats a good thing for old S13's, makes them cheap to get bigger numbers as lot of GTR bits work well on CA18s, and not so much on other cars

S of S

[TokyoTaxi]

OK. Now I'm confused again !

So..... S5 RX7 Turbo injectors are the go ?

I know it appears above but, do you know how the Series 5 RX7 Turbo injectors hook up to the fuel rail on an RB20 ? I've been told by AFI that the Mazda ones are "O" Ring fitment, but the RB20 ones are a barbed press on hose deal. If this is true I'll need a different fuel rail.

[Joe]

you got to remember they only have 4 injectors.

when buying rx7 injectors, you will need 2 check the ohm with a multimeter as roy said.

s5 are 550cc made my denso.

s4 are also 550cc but earlier model s4 are low impedence.

People say there red tops others say there purple tops.

dont worry about injector colour tops.

Just beware as i seen a few people buying the wrong injectors.

[TokyoTaxi]

This is my point exactly.

I've heard too many stories about ECU's having a coniption due to wrong injector fitment.

I just wish there was someone out there who has done this and knows exactly what works and what doesn't. And what to get etc, etc, etc.

[TokyoTaxi]

Well,

I've bitten the bullet. I found out that there are injectors available ( ex Japan ) that will fit into an RB20DET without ANY modifications other than ECU resetting on the dyno so I've ordered a set.

Thanks for everyone's help and I now know a lot more about nissan injectors.

[R31Heaven]

RB20det Silver top injectors are high impedence( 12-14 ohm), GTR injectors are low impedence (2-4 ohm), so work well on Redtop RB20's. If you place bigger injectors into your car the ECU will have to be tweaked to except them or you will have all sorts of fuel problems

[rb20-calais]

for around 230rwkw what is the best option for a rb20 and cost? i have been told GTR injectors wont fit... i will be running a wolf 3d v4 so the impendancew wont matter? can standard injectors be high flowed? They have Sard 550cc and 850cc injectors for $130 each at greenline... would they work?

Evan

[Steve]

Originally posted by FAT32

Good God I'm confused now !!!....

...If I could just figure out exactly what to use to try to get around 220 - 230rwkw from my stock RB20DET engine, with chipped ECU, FMIC and a GT2530 running 1.2bar while maintaining a respectable fuel economy, I'd be as happy as a pig in $hit.

This may be a bit late, but you dont need new injectors for that sort of power. Clint32 has had over 230rwkw with stock injectors, I know a guy who runs a 2530 with stock injectors and makes 230rwkw.

Just fuel pump and adj fuel pressure reg - all you need.

[TokyoTaxi]

Steve,

From what I've heard ( extensive nagging for info ) at around 1.2bar looking for 230ish rwkw's the injectors are restrictive and at their limits which "can" produce a "lean out" in the engine and cause damage so I think I'll lean to the side of caution and go ahead with the injectors.

Thanks anyways for the suggestion

[Bl4cK32]

Fat32, can ya give us some info on them larger injectors that drop straight in? What size are they, brand etc...