will rb25 injectors work in the rb20?

[sil820]

what other cars injectors will fit in the rb20det?

[Yellow4g63]

Stock DSM injectors will fit that rail and are 450cc. You can get them cheap if you look around on DSM trader or go to a DSM shop. I have seen 4 for $50 so 6 should cost much more. The RB25 injectors are like the SR and won't fit the RB20 rail. maybe you can use the 25's fuel rail? with the injectors.

[93RPS13]

the rb20 and RB25 have different impedance

[goofynick6]

and different rails/injectors styles..

[kevie88]

DSM injectors can work on a RB20 intake/fuel rail? neato! I was looking around for 550cc's from an RX7, but maybe I'll just get a set of the 450's as I have pretty modest power goals..

[Yellow4g63]

DSM injectors can work on a RB20 intake/fuel rail? neato! I was looking around for 550cc's from an RX7, but maybe I'll just get a set of the 450's as I have pretty modest power goals..

Yes sir I tested my Denso 660's I had left over from my DSM and it went right into the rail just need 2 more

[sil820]

sweet im gonna look for sum dsm injectors now

[PROJECTRB240SX]

YOU CAN USE RB25DET INJECTORS IF YOU SWAP FUEL RAILS WITH IT. WHY YOU WOULD CHANGE FROM TOP-FEED TO THE GOD-AWFUL SIDE-FEED IS BEYOND ME BUT ANYWAY ITS POSSIBLE.

[goofynick6]

I wonder if the dsm 450's are enough for 350whp, or if I'd need 550's to be safe..

Nick

[Yellow4g63]

sweet im gonna look for sum dsm injectors now

They are also different impedance than the RB20 injectors. They are low vs High. You will need some inline resitors so the computer won't freak out.

Dosen't the GTR come with 450cc injectors stock?

[PROJECTRB240SX]

SOME DSMS ARE HIGH IMPEDANCE (AT LEAST THE VR-4S).... GTR'S HAVE LOW IMPEDANCE INJECTORS.

[Wulfgang]

Reading the GTR engine manual, I see a set of six resistors in series with the 6 injectors.

iirc stock RB20 injectors are 270cc/min, so 450/270 x 210 hp = 350 hp at the crank with a bit of headroom to spare.

[DSMs_Suck]

all dsms are low impedance unless maybe its a non turbo.

[PROJECTRB240SX]

MY FRIENDS VR-4 HAS HIGH IMPEDANCE INJECTORS.

[candela]

Quote »all dsms are low impedance unless maybe its a non turbo.[/quote]

Then your friend has probably done some re-wiring with some larger injectors or something, as ALL (usdm and JDM) VR4-s and DSM's are Low Impendence...

That is really cool though that these fit in there. Makes is all that much cheaper. :ylsuper

[PROJECTRB240SX]

OHH OK THEN.... YEAH I'M NOT A DSM FAN I JUST KNOW HE HAS HIGH IMPEDANCE INJECTORS. ANYWAY TOP-FEEDS ARE EASY TO FIND AND IF THE GTR HAS A REMOVABLE RESISTOR SET IT MAY BE EVEN EASIER TO UPGRADE.

[goofynick6]

Galant VR4 or 3000GT VR4?

[Yellow4g63]

Galant VR4 or 4G63 Turbo cept the Auto's they have smaller injectors. I think those are 370's

[PROJECTRB240SX]

it was a 3000gt vr-4

[sil820]

so which injectors am i looking for .. dsm turbo? manual?

[Yellow4g63]

Yeah 5speed Turbo injectors. Check DSMtrader.com or some of the DSM message boards. Watch out for some guy named manny who lives in Sandiego that pos has ripped of alot people.

Hit me up I'll see if I can find some local DSM guys that have them.

[dareo]

So a fuel upgrade could be as simple as DSM injectors and a SAFC? granted you arent trying for a ton of power. I'd like to get 300-350hp out of my RB20 (if i finally decide on going RB20)

[Yellow4g63]

Maf is also going to limit power too. Whats the HP rating on the rb20/25 maf? 350? 400?

[dareo]

Ah yes the MAF. I think the RB20 Maf is good till 300hp if im not mistaken.

[DSMs_Suck]

440s could easily support 350 to the tire on a 6 probably closer to over 400... check rc's site for the exact calculations if you wish. In general tho for supras and all 6s.. 550s will basically max the same time a walbro255 does which is around 500-550 whp.

Murray

[dareo]

The general rule of thumb on a 6 cylinder for injectors is if its 270 then the max is pretty close to 270hp. I would want to give myself 5-10% extra headroom on this rule/estimate.

370cc injectors should be plenty for my needs, the DSM automatics have 370cc injectors that fit the RB20 then? Would get the 450s but i wanna keep the difference minimal cause i dont really trust a SAFC to modify huge differences in injectors.

[Yellow4g63]

It should be able to handle the 450's if you run a bigger maf. The low RPM 1k-3k prob goin to suck. I would also map hack the afc too works like a charm.

[Project240]

So what all would be involved in putting some 450cc DSM injectors in an RB20?? Does using these low-impedance injectors on the high-impedance motor require a lot of work, or would I be able to buy a resistor pack and plug it in???

[Yellow4g63]

So what all would be involved in putting some 450cc DSM injectors in an RB20?? Does using these low-impedance injectors on the high-impedance motor require a lot of work, or would I be able to buy a resistor pack and plug it in???

GTR resistor box or inline resistors near the ecu for each injector.

[GTR Shop]

444cc in the GTR.. easy upgarde.. jst wore in a resistor inline on the - side of the injector.