What Is Better Rb30et Or Rb25det

[AAA34T]

which motor is more reliable and stronger rb30et or rb25det i am planning an engine swap in my c210 skyline all i want is arround 180kw at the wheels or an easy 13 sec quater but i want reliability more than anything the car weights 1200kilos and is a weekend car to have fun with

[TommO]

RB25DET for sure Stronger pistons, better head, etc etc

However, getting a 3L and putting a RB25 head on it... now that's a different story But not really required for 180rwkw. A standard RB25 will make 250rwkw reliabiliy if all support mods are setup correctly.

[AAA34T]

can i put a stock rb25det head on a stock rb30et bottom end and keep the rest as standard or do i need to upgrade other things to cope with the bigger bottom end what power would the rb30et with the twin cam head put out just a guess

[gun32gtr]

25 would be btter all round id say,lot newer and stuff,but as u would have read there is plenty of unreal rb30 going round just that most need severe attention,as the one i had did,so be careful if u plan to buy 1

[discopotato03]

Actually RB30 bottom end is cheaper to build than RB25 and makes torque without reving the piss bags out of it . At first glance the extra 500 od cc's don't look like much but the longer stroke and much better rod stroke ratio do pay off .

The only drama is the front water passage and VCT oil supply , not that difficult to get around . The larger engine will make the same power as the 25 with less revs and boost or more from the same . Good rods and pistons for RB30's don't cost any more than 25's and make the 30 a proven 8000 rpm engine that can do 900 hp in 26/30 form . In more sedate tune 300Kw that pulls like a locomotive (and I should know) everywhere is pretty good .

[R31Nismoid]

25, simple

[AAA34T]

do the rb25det have vvt system and which ones have it and is the vvt realy worth it has anyone ever done an rb motor into a c210 and was it easy hard how was it

Edited October 16, 2005 by datzla

[Bluprint]

All the RB25DET's have VVT except for the R32 versions.

I like the VVT, it gives you a nice little extra kick above 4700rpm or so when it kicks in.

By the way, full stops and sentence structures are a good thing.

[AAA34T]

oooh come on man give me a break i am half asleep and trying to type hahaha

Does the r32 GTRs have the vvt in the rb26dett.

Edited October 17, 2005 by datzla

[discopotato03]

No VVT RB26 in factory trim . The only RB25 without it is the NA one from the R32 RWD version . The head/block water passages are the same as the RB30 and fit without mods though need extra tensioner on the block and a different cam belt .

See the Forced Induction section of this site .

[V8skylineMAN]

I am currently fitting an Rb30 to my C210 coupe, so I'll let you all know how it goes. rb25det head when i get it and hopefully a T51R-SPL....should be fun

[Alfadog]

Sorry, but what R32 had the RB25??

[AAA34T]

How far have u got so far with the engine swap so far. Just wondering did you do a brake upgrade and what did u use.I am just doing all the research before i start so it does not take as long.any help is good help. v8skylineman [jason]

Edited October 17, 2005 by datzla

[0HR-30T]

  Alfadog said:

Sorry, but what R32 had the RB25??

<{POST_SNAPBACK}>

Some of th elater model ones...but was a RB25DE only

[342Four]

go the rb30et

far stronger engine

saw in a street commonwhores mag a Vl commonwhore with a rb30et running 306.6rwkw with stock LSD diff and tailshaft

if u got the dough buy a rb30e, plug a big turbo on it, chunky cam, forged rods, new pistons, new ecu, new plenum (possibly custom), bigger throttle body and u will have one mean ass c210

the rb25 engine will cost a lot more and therefore less money for mods!!

simple solution - buy decent rb30 engine = more money for mods = mean ass car!!

[R31Nismoid]

wow... someone makes 300rwkw on stock internals.

whoppee do.

It doesnt meant shit, anyone can crank a stock motor well beyond its limit for the sake of one dyno run.

[342Four]

it wasnt for just one dyno run

its his daily driver

all be it that he detuned it after posting 300 rwkw

[R31Nismoid]

  usherly said:

it wasnt for just one dyno run

its his daily driver

all be it that he detuned it after posting 300 rwkw

one line you say it wasnt for one dyno run

2 lines later you say that it was detuned.

i think that proves exactly what my post was getting at

[slow_r31]

How many rb25's blow up their ringlands at 250rwkw, vs rb30's that still have stock internals that survive at that power?

why is it that the top few spots of the r31 club have 100% STOCK rb30E bottom ends, except for a rb25 with forgies and gtr rods that can't even make top spot on c16 and semi's hehe

[Fly_With_Sky]

guys we are getting off topic here. The guy only wants around 180rwkw not 250 plus.

Personally i would think you should go with the rb25 as its a newer, more technologically advanced engine.