Rb25 stock and Gt35 max boost - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rpanaque · 05-27-2012, 11:12 AM

Hi everyone,

i already got a nissan silvia s15 with rb25 swap, well this car has some aftermarket stuff such as Intercooler, 3'' IC piping, 3'' lines, .44mm WG, cometic head Gasket, haltech e6X (i assume is ussing batch injection), GT35r, Walbro 225, but stock injectors.
Right now its boosting 15 psi (16 peak), is this a safe boost press for stock inj? how much boost can stock inj support (on GT35)? aprox how much RWHP can i make?, because right now i think is 320 - 340 aprox (i think is a little low for this turbo at 15psi). Hope someone can help me. Regards

rpanaque · 05-28-2012, 09:45 AM

anyone? im new in RB world and i dont want to mess up my engine.

HIGHFIVEBETA · 05-28-2012, 09:51 AM

You should really search for this information and find it yourself.

rpanaque · 05-28-2012, 10:52 AM

Quote:

Originally Posted by HIGHFIVEBETA

You should really search for this information and find it yourself.

Thanks, that was great help.

Does anyone really wanna help?

di-devol · 05-28-2012, 10:58 AM

Do you have a wideband? If so, what are you afs? If not, get one immediately, check your afrs, then think to yourself if they are safe or not. If not, get bigger injectors and go get a tune.

hobbs · 05-28-2012, 10:59 AM

Stock RB25 injectors are 370cc, I know 370cc injectors max out around 250whp on a SR20, my guess would be around 300whp for a RB25. You will run out of fuel very quickly, do you have a wideband?

rpanaque · 05-28-2012, 11:06 AM

Quote:

Originally Posted by hobbs

Stock RB25 injectors are 370cc, I know 370cc injectors max out around 250whp on a SR20, my guess would be around 300whp for a RB25. You will run out of fuel very quickly, do you have a wideband?

My wideband is on the way ,hope to get it this week, hope everything going well because i dont know how many miles (street, track) the last owner drive with this configuration. As soon as i get the numbers i will post it (i think is not going to be good but just wait). Thanks

240sxvaj · 05-28-2012, 11:10 AM

You need to do your own research. We all learn by searching. Look at other RB builds and learn that way. Your never gonna learn if you keep getting answers handed to you.

rpanaque · 05-28-2012, 11:16 AM

Quote:

Originally Posted by 240sxvaj

You need to do your own research. We all learn by searching. Look at other RB builds and learn that way. Your never gonna learn if you keep getting answers handed to you.

First, Why did you think i didnt make any research? i have been checking this for weeks and nothing, everyone has bigger injectors on GT35, and my wideband is on the way (takes 3 weeks to get it here in Peru). That's why i ask ... (hoping someone has the same configuration as mine) to get a early answer, I will check it with i wideband, i will retune my ECU, and of course im going to buy bigger injectors... just wanna get and early answer (for someone which has the same problem or configuration)

Thanks all for your time, as soon as i get the result i will post it (in order to help others).

*fliprayzin240sx* · 05-28-2012, 07:53 PM

370cc injectors...good rule of thumb on RBs is that 1cc injector = 1hp. So stock injectors are hypothetically good enough to support up to 370 hp. Now, how the tune is, is a different story. I'd leave it alone unti you some bigger injectors. You should be able to hit 550-600hp on an RB with that turbo. So go get bigger injectors.

05-28-2012, 07:53 PM	#10
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	370cc injectors...good rule of thumb on RBs is that 1cc injector = 1hp. So stock injectors are hypothetically good enough to support up to 370 hp. Now, how the tune is, is a different story. I'd leave it alone unti you some bigger injectors. You should be able to hit 550-600hp on an RB with that turbo. So go get bigger injectors. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-28-2012, 09:45 AM	#2
rpanaque Join Date: May 2012 Location: peru Age: 41 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	anyone? im new in RB world and i dont want to mess up my engine.

05-28-2012, 09:51 AM	#3
HIGHFIVEBETA Zilvia Junkie Join Date: Jun 2011 Location: Where the wild things are, FL Posts: 327 Trader Rating: (4) Feedback Score: 4 reviews	You should really search for this information and find it yourself.

05-28-2012, 10:58 AM	#5
di-devol Zilvia FREAK! Join Date: Jun 2010 Location: Woodinville Age: 42 Posts: 1,412 Trader Rating: (5) Feedback Score: 5 reviews	Do you have a wideband? If so, what are you afs? If not, get one immediately, check your afrs, then think to yourself if they are safe or not. If not, get bigger injectors and go get a tune.

05-28-2012, 10:59 AM	#6
hobbs Nissanaholic! Join Date: Aug 2010 Location: Under a rock Posts: 2,264 Trader Rating: (43) Feedback Score: 43 reviews	Stock RB25 injectors are 370cc, I know 370cc injectors max out around 250whp on a SR20, my guess would be around 300whp for a RB25. You will run out of fuel very quickly, do you have a wideband?

05-28-2012, 11:10 AM	#8
240sxvaj Nissanaholic! Join Date: Dec 2007 Location: So-Cal! Age: 34 Posts: 2,192 Trader Rating: (38) Feedback Score: 38 reviews	You need to do your own research. We all learn by searching. Look at other RB builds and learn that way. Your never gonna learn if you keep getting answers handed to you.