CSx8213x

I would like to ask this 2 questions ....

R33 GTS with RB25DET engine .... this engine got boost cut or not ?

and .... what is the original stock injector size for this engine ?

     

Innocente

Boost cut is set by the ECU, not the engine. However in the stock setup, the R33 GTS has a standard "2 stage" boost. 5psi then 7psi max controlled by the stock actuator.

     

CSx8213x

ohh ... i mean if i using a boost controller ..... is there any boost cut from the stock ECU ?

     

Innocente

Yes. 1.0bar.

     

CSx8213x

thanks ..... bro Innocente ...

then how about the injector size ?

ermm... can i take away the boost cut without get any aftermarket boost cut defender like that ?

my friend told me RB20DET no boost cut ... is that information correct ?

     

opp61

Bud

The std ceramic turbine will be spitting out metal parts above 1 bar. Sure u wanna disable the boost cut? Unless u are going for a bigger turbine, leave the boost cut there. It is there for a reason.

     

CSx8213x

ohhh .... just want to know more of the car ...... collect more information before start the modification mah ...

     

Innocente

not sure about the injector size though

     

a31gtst

Side Feed 270cc

     

CSx8213x

a31gtst

the injector size so small only ?

     

kaminari

All std ECU mostly comes wth boost cut feature at 0.9bar....u can change to S15 stock injector 380cc for upgrading support arnd 400hp....

     

CSx8213x

thanks bro kaminari ....

just curious ... VR4 2000cc turbo using 450cc injector ... how come S15 2000cc turbo also ... just using 380cc ?

     

kaminari

myb tht`s the reason why SR20 is more fuel efficiency,hee.....Nissan n Mitsubishi...sure different.Fuel pump,fuel press....Ecu...all related

     

a31gtst

Its hard to compare like that, like kaminari said different manufacturer will have different specs.

If you want to try a cheap an easy upgrade for boost, go and get a RB20det actuator and replace your RB25 one. The standard 25 one is too soft, you should be running at abt 0.7-0.8 by just doing that if the rb20 actuator is still in good cond'tn. FYI I have run up to 1.2 bar of boost with a stock ecu before(vacuum hose tercabut!)...never faced any cut.

You can also source for S15 sr20 injectors and put them in, they are pnp.
Although you will need an engine management to actually support changes to the injector settings such as size and duty cycle else it wont work. Power FC is the way to go but hard to find for late model RB25det, there are other engine managements out there, just hv to see how deep your pockets are.

You can get other brands of injectors such as Sard or Nismo but very expensive especially side feed, its much easier and cheaper to find top feed injectors so if there is no need to upgrade the injectors jst yet then have fun first. Dont forget you must change your fuel pump and at least have a simple fuel regulator to check your fuel pressure.

     

khoyos

isnt it 370cc for RB25 and 480cc for S15?