rb25 vrs sr drivability.. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240KAT · 11-08-2008, 01:33 PM

ive never driven a rb25, only riden. Ive owned a tuned sr, and im curious about the differance in how the vehicles drive. Basically, RB + swap mods vrs SR + fmic, cams, exhaust, etc.

bardabe · 11-08-2008, 05:08 PM

RB = Potentiometer
SR = On / Off switch

thats the best way i can put it. basically an RB the power is always there and ready for delivery. the SR is kind of like Vtec. u gotta wait for the turbo to spool to feel some power. I had both blacktop S13 SR20, RB20 and RB25.

icemhan_21 · 11-08-2008, 05:40 PM

Quote:

Originally Posted by bardabe

RB = Potentiometer
SR = On / Off switch

lol just learned this yesterday from electrical class!

240KAT · 11-09-2008, 08:57 AM

perfect..is there a huge driving differance between the 20 and the 25 once modding incurs? The $1000-1200 differance in price makes me want to lean toward the rb20...

*fliprayzin240sx* · 11-09-2008, 09:55 AM

No RB20 isnt worth it because finding parts for it is a pain in the ass. No point of having 6 cylinders if it has the same potential as an SR20. Go RB25, it'll better serve you once you starting hitting over 400hp.

Ali 556 · 11-09-2008, 12:32 PM

other option : $$$/Whp

2JZ-GTE 3.0 L LESS Lag...500-700 Rpm less lag

Built 2.0L Sr

Built 2.4L KADE (Cheapest Route)

LSx Swap ( expensive ) But 400Whp N/a Is Worth it...

dunno but if i'm gonna "upgrade" I'll upgrade to somthing worth it...

A

240KAT · 11-09-2008, 03:22 PM

Quote:

Originally Posted by Ali 556

other option : $$$/Whp

2JZ-GTE 3.0 L LESS Lag...500-700 Rpm less lag

Built 2.0L Sr

Built 2.4L KADE (Cheapest Route)

LSx Swap ( expensive ) But 400Whp N/a Is Worth it...

dunno but if i'm gonna "upgrade" I'll upgrade to somthing worth it...

A

2jz's are really damn expensive, and id think theyre a bit bigger (as far as taking up engine bay space wise). is there a 5spd that can attach to a 2jz? can you put on a 2j head onto a 1j block? this is really rabbit trailing, but i like this thread.

Ali 556 · 11-09-2008, 03:35 PM

Quote:

Originally Posted by 240KAT

2jz's are really damn expensive, and id think theyre a bit bigger (as far as taking up engine bay space wise). is there a 5spd that can attach to a 2jz? can you put on a 2j head onto a 1j block? this is really rabbit trailing, but i like this thread.

RB25/26 And 2JZ Are the same size....You can attach R154 From a 1JZ Supra Or R154 From A sorar (2jz Sc300)...

i can provide pix...but i'm tired now....mean while check this out :

Project S14 240sx - Supraforums.com

^^ maybe you need to register(sp?)

Ali

bardabe · 11-10-2008, 05:35 PM

Quote:

Originally Posted by fliprayzin240sx

No RB20 isnt worth it because finding parts for it is a pain in the ass. No point of having 6 cylinders if it has the same potential as an SR20. Go RB25, it'll better serve you once you starting hitting over 400hp.

i had an RB20 it held fuckin great. and the lag wasn't too bad with a big single (holset HX35) you can rev the living shit out of those engines with valve train mods. i say the RB20 is really worth it. if you arent planing to go 500WHP or above (tranny starts giving problems and need to swap out for an RB25 trans) but for a street car, shit RB20 > SR20 all day. sure SR20 parts are more common but the RB20 has allot of parts cross reference to US cars Water pump, Timing belt, oil pump, main and rod bearings are RB specific (20.25.26 are the same) but phase2 carries them as well as enjuku racing. you can even talk to otis about it, he loves RB20's prolly more than I do.

blakeZX · 11-24-2008, 11:26 AM

I have an RB25 Series II in my 97 SE and it is a torque monster, you can shift it way early and it just pulls and pulls. It's pretty much power on tap, still having excellent spool characteristics with the stock BB turbo.

I have also driven a 95 with an S14 SR and ball-bearing T-28 at 15psi. On city streets, the SR felt pretty wimpy until boost hit (which you wouldn't even do much in city driving unless you were trying to). On the freeway though, it was a rocket since boost was so close at hand and it was light as shit.

I'd say go for the 25, it will definitely put a smile on your face everytime you drive it. It's hilarious how the sound of the motor makes every head on the street turn when you roll by too. But yes, it will cost more and sourcing parts will take some effort on your part.

GL

!Zar! · 11-24-2008, 11:32 AM

lol you live in california.

naka.

blakeZX · 11-24-2008, 12:03 PM

Quote:

Originally Posted by !Zar!

lol you live in california.

naka.

Who, me? Yes, I do. What's yer point? The ref? There's ways around the ref if you know your reg. stuff

SHIFT_*grind* · 11-24-2008, 12:34 PM

RB20's sound beauuuuuuuuuuuuuutiful.

That's all I got.

11-08-2008, 01:33 PM	#1
240KAT Zilvia Addict Join Date: Jul 2003 Location: Columbia, MD Age: 37 Posts: 797 Trader Rating: (0) Feedback Score: 0 reviews	rb25 vrs sr drivability.. ive never driven a rb25, only riden. Ive owned a tuned sr, and im curious about the differance in how the vehicles drive. Basically, RB + swap mods vrs SR + fmic, cams, exhaust, etc. __________________ Drew

11-08-2008, 05:08 PM	#2
bardabe Post Whore! Join Date: Aug 2005 Location: SoCal Age: 34 Posts: 4,719 Trader Rating: (10) Rides Gallery: bardabe Feedback Score: 10 reviews	RB = Potentiometer SR = On / Off switch thats the best way i can put it. basically an RB the power is always there and ready for delivery. the SR is kind of like Vtec. u gotta wait for the turbo to spool to feel some power. I had both blacktop S13 SR20, RB20 and RB25. __________________ Review Thread

11-09-2008, 08:57 AM	#4
240KAT Zilvia Addict Join Date: Jul 2003 Location: Columbia, MD Age: 37 Posts: 797 Trader Rating: (0) Feedback Score: 0 reviews	perfect..is there a huge driving differance between the 20 and the 25 once modding incurs? The $1000-1200 differance in price makes me want to lean toward the rb20... __________________ Drew

11-09-2008, 09:55 AM	#5
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	No RB20 isnt worth it because finding parts for it is a pain in the ass. No point of having 6 cylinders if it has the same potential as an SR20. Go RB25, it'll better serve you once you starting hitting over 400hp. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

11-09-2008, 12:32 PM	#6
Ali 556 Zilvia Junkie Join Date: Sep 2006 Location: Far Far Away...... Posts: 359 Trader Rating: (0) Feedback Score: 0 reviews	other option : $$$/Whp 2JZ-GTE 3.0 L LESS Lag...500-700 Rpm less lag Built 2.0L Sr Built 2.4L KADE (Cheapest Route) LSx Swap ( expensive ) But 400Whp N/a Is Worth it... dunno but if i'm gonna "upgrade" I'll upgrade to somthing worth it... A __________________ '95 S14 Se With HKS's - BREMBO's - ES/SPL.

11-24-2008, 11:26 AM	#10
blakeZX Zilvia Junkie Join Date: Jun 2008 Location: Seattle, WA Age: 38 Posts: 412 Trader Rating: (16) Feedback Score: 16 reviews	I have an RB25 Series II in my 97 SE and it is a torque monster, you can shift it way early and it just pulls and pulls. It's pretty much power on tap, still having excellent spool characteristics with the stock BB turbo. I have also driven a 95 with an S14 SR and ball-bearing T-28 at 15psi. On city streets, the SR felt pretty wimpy until boost hit (which you wouldn't even do much in city driving unless you were trying to). On the freeway though, it was a rocket since boost was so close at hand and it was light as shit. I'd say go for the 25, it will definitely put a smile on your face everytime you drive it. It's hilarious how the sound of the motor makes every head on the street turn when you roll by too. But yes, it will cost more and sourcing parts will take some effort on your part. GL __________________ -blakeZX \| 1997 240SX SE (RB25DET), 2008 350Z Nismo Edition (VQ35HR)

11-24-2008, 11:32 AM	#11
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	lol you live in california. naka. __________________

11-24-2008, 12:34 PM	#13
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 41 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	RB20's sound beauuuuuuuuuuuuuutiful. That's all I got. __________________ My seller review thread