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Modified Rb20 Vs Stock Rb25

R32FOURDOOR

By R32FOURDOOR,
in Engines & Forced Induction

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R32FOURDOOR Collaborator

R32FOURDOOR

Posted
Posted

Hey guys,

Is it worth rebuilding my own RB20DET in my R32 or would i just be better off going and getting a semi-stock RB25DET and putting in in my car.

In terms of the power output which engine is the better one to work?

Can RB20DET after market performance parts be picked up easlily in Australia?

Cheers

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https://www.sau.com.au/forums/topic/100446-modified-rb20-vs-stock-rb25/
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Col-GTSX Grand Master

Col-GTSX

Posted
Posted

I keep breaking rb20's so i went to an rb25 and have not had any issues at all...

Remember for power vs dollars spent it goes like this

1. RB30det/t

2. RB26det/t

3. RB25det

4. RB20det

I mean if you have a 20 then go to the 25 if you have a 25 and want more go to the 26 and if you have a 26 and want more then go a built 30....

Know what i mean....

Roy Grand Master

Roy

Posted
Posted

Its such a matter of personal preference and what you want. If i had $5,000 to spend on a mostly stock GTST i wouldnt bother with an RB25. At best you will end up with 200rwkws and probably have less average power then if you put a 2530 on your RB20.

If money really isnt a problem, or killing an RB25 not that scary a proposition then you really cant argue against going for the biiger displacement Nissan engine, as its not as though they are scary engines liek the 5.4L Ford V8 which dynamincally arent good engine.

...as for strength, give me a std RB20 over any other RB engine. If your killing RB20s then i would be so bold as to say its not the negines fault but the drivers, as they take an absolute hammering, provided you keep an eye on temps, fluids etc

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
I keep breaking rb20's so i went to an rb25 and have not had any issues at all...

Remember for power vs dollars spent it goes like this

1. RB30det/t

2. RB26det/t

3. RB25det

4. RB20det

I mean if you have a 20 then go to the 25 if you have a 25 and want more go to the 26 and if you have a 26 and want more then go a built 30....

Know what i mean....

i woulnt put the 26 cheaper than a 25, my 26 im building now is costing a LOT more than my RB25 did <_<

TTT Grand Master

TTT

Posted
Posted

your question is wether it's worth REBUILDING an Rb20 or buying an RB25?

out of those 2 options only, I'd buy a 25.

however, I say that if you have enough money to BUY and fit and tune an RB25, you have enough money to build, fit and tune an RB30det.

which ofcourse is my pick of the RB engines.

Roy Grand Master

Roy

Posted
Posted

LOL, i read that, and i took it as

"I have the choice of rebuilding my RB20 in order to aquire enough power to put my car into outer orbit...or buy a std RB25 and have to wait for my neighbours dog to take a piss on a wild daisy, then another two days for it to die so that the power of a std RB25 would allow me to remove this weed from my lawn"

So i didnt think there was anything broken about the std engione?!?!?! But i am struggling with English since Xmas NYE celebrations

carl h Proficient

carl h

Posted
Posted

rb20 rebuilt with a larger turbo should provide some significant fun, not to mention with the money saved on a rebuild rather than buying a rb25 you will KNOW the exact condition of the motor and can go from there.

when you buy a used motor you are taking a gamble, it might last it might not its hard to say.

i swapped a rb20det into my s14 as here in the us we got shafted and got a 2.4l which makes 155bhp, and even tho i blew the rb20 i have no regrets and am in the process of building it back up.

predator Grand Master

predator

Posted
Posted

i'm with ash..rb20's are crappy.. ok up to a certain point, but after that not worth spending too much money on them.

modded rb20 good highway cruiser from 100-200km/hr.. but amongst town I'd almost prefer an rb30E :)

_8OO5TED_ Mentor

_8OO5TED_

Posted
Posted (edited)

your considering rebuilding your RB20 because it popped? Isnt that enough to steer clear and UPGRADE to RB25?

400rwhp is easily achievable and streetable on a RB25 as opposed to a RB20, I guess it depends how far you wanna take it...

Edited by _8OO5TED_
RANDY Veteran

RANDY

Posted
Posted

Getting a stock Rb25 is called "headroom" ;op

Even if it is as quick as a modded RB20, you can easily mod the RB25 and get much more out of it.

I recken you could chuck RB25DET NEO in the list there... stock 206kw for a few more dollars. =-]

RB30-POWER Mentor

RB30-POWER

Posted
Posted

The only people that will tell you an RB20 is any good are the owners that are either in denial or haven't seen the light of the larger displacement RB motors. :)

I don't care if you have an RB20 with a T78, give me a stock RB25 anyday, way more fun!

The again, there is only two real RB motors,

1. RB30DET (do it with cubes)

2. RB26DETT (do it with revs)

:)

See the light of the above motors and don't look back :)

RB20 was probally good for the jap taxi's though ;)

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