rb20 v rb25 v rb26

[JILTED]

Other then the obvious capacity difference, what other differences exist between these engines?

Is the RB26 really that much better then the RB25? With the money saved on buying rb25 over the rb26 could you purchase supporting mods that would push out more power?

Are there any dramas bolting up RB25/RB26 to RB20 gearbox (other then the box not might not be strong enough)?

Cheers,
Ryan

[rowlzey]

im pretty sure u need an newer gearbox then a rb20 one ay. Im there is a bit of difference between rb20 and rb25 but yer between r26 and shit im not really sure ay, but yer i guess it depends on ur goal with single of twin turbo and shit,and then comes price, for money i guess the rb25 is probally one of the better ones. But yer i know fuc all really, just heard by mouth and shit. But yer go the rb's dude

[JILTED]

Cheers, that was pretty informative

[zeroyon]

there two things to compare

rb20 to rb25

The rb25 has higher compresion over 20, means less boost but more low down responce. Thats the main thing i can think of thats relavent.

The Rb26 vs the other two.

The rb26 has angrier cams and solid lifters. It has six throttle bodies and plenum that feeds on the cool side of the engine. I think you will find the oil pump is larger too.

There are a lot more differences I am sure. These are the main ones I know about.
I am sure someone esle on here can give more info.

The bell housing patterns are the same for all three rb's if you can bolt a box to one you can to another.

26's really do seem to make power very easily compared to a rb25. Std turbo's/injectors/ecu etc but cooler / exhaust / boost has seen around the 330 rwhp on a rb26. Give or take.

To make that on a rb25 you will need ecu and a large turbo as well (offsets the cost)and I am confident reliabilty will not be the same.

[1JZNOSHIT]

im pretty sure u need an newer gearbox then a rb20 one ay. Im there is a bit of difference between rb20 and rb25 but yer between r26 and shit im not really sure ay, but yer i guess it depends on ur goal with single of twin turbo and shit,and then comes price, for money i guess the rb25 is probally one of the better ones. But yer i know fuc all really, just heard by mouth and shit. But yer go the rb's dude

What The???

[pnblight]

if you were chasing real rwhp the rb26 is the best choice dollar for rwhp as it runs a head which can 600hp std and the rods that are stronger then both rb20/25 and mine are handling 529rwhp with std pistons etc just a set of cams are the only upgrade of the internals and you WILL NOT get that out of a rb25 std internals. They responce to light bolt upgrades very well.

[B0BB0]

keep in mind it hard to find a rb26 that doesnt need a rebuild, and if it does budget 15k+ of a rebuild with some fruit.

if you dont plan on going crazy, ie 400hp + i would go a rb25, and besided if its for rwd application, buying a rb25 will save you 1500$ on a gearbox, provided you buy an engine/box package.

[magic1]

rb25 injectors are side feed, 20 and 26 top feed. 25 head flows a higher average air flow, 26 flows more topend.

[Shaolin242]

im pretty sure u need an newer gearbox then a rb20 one ay. Im there is a bit of difference between rb20 and rb25 but yer between r26 and shit im not really sure ay, but yer i guess it depends on ur goal with single of twin turbo and shit,and then comes price, for money i guess the rb25 is probally one of the better ones. But yer i know fuc all really, just heard by mouth and shit. But yer go the rb's dude

I would take Rowlzeys advice and "Go the Rb's dude ayyyy'

[ju|ez]

im pretty sure u need an newer gearbox then a rb20 one ay. Im there is a bit of difference between rb20 and rb25 but yer between r26 and shit im not really sure ay, but yer i guess it depends on ur goal with single of twin turbo and shit,and then comes price, for money i guess the rb25 is probally one of the better ones. But yer i know fuc all really, just heard by mouth and shit. But yer go the rb's dude

HAHAHAHAHA!!!
Best put that bong down mate!

[upgarage]

depends on budget really

[rowlzey]

jezz man, its the alcohol thats the problem here

[CeFiRoHH!]

how boost does a stock rb20det have?

and wots the compression ratio?

[Iandawsonwa]

stock boost is 7psi dont now what the compression ratio is

[TJ]

tristan made 400 with ease, pretty decent engine build, now will probobly make 500 with ease

nothing wrong with a modded 25

stock for stock, i prefer a 20 i think - its not a 3k loss if you pop one and they love to rev, 25's dont.

[Sneaker]

The RB26 is so different from the others. It has:

A 6 throttle body setup,
Shorter plenum runners,
Large font mount intercooler,
Different cams,
Stronger internals,
Higher flowing head,
Higher rev limit (8000rpm)

Because it was designed as a race engine it was setup to rev high and get all it's power from the mid to top end. Hence the short inlet runners, 6 throttle bodies, twin turbos and cam designs.

You can get just as much power from the others, it just costs you more to get there.

[Iandawsonwa]

also there is four different builds of the rb20's, three different for the rb25's and three different rb26's.

[TJ]

rb20 - more then 4 i reck

hr31 nics
hr31 non nics
cefiro
laurel
r32 series 1
r32 series 2

all slightly different i think

rb25

series 1 33

series 2 33

whats the other one?

rb26

32 gtr
33 gtr
34 gtr

plus the n1 versions of each... more then 3

[Iandawsonwa]

there other is the r32 rb25 non veriable cam timing. so there is a series two r32 whats the differents i think mine mite be how do you tell

[Sneaker]

There was actually a N/A RB26DE as well. I forget which car it came out of.

[Shaolin242]

is this engine going in the cefiro ryan? go the 25, as somone said before u get the gearbox and front brakes too if you get the halfcut...u said before you werent after something too hipowered..for what you are after id go the 25..its safer in the long run...

[R31 POWER]

Some Autech thing with 4wd http://www.r31house.co.jp/r31/ZZ005.htm
i like what R31House did with it http://www.r31house.co.jp/r31/Z0005.htm


so there is a series two r32 whats the differents i think mine mite be how do you tell
No RB20 on the timing cover,to fuel regs and slighty larger turbs.There may be more thou.

[1JZNOSHIT]

rb20 - more then 4 i reck

hr31 nics
hr31 non nics
cefiro
laurel
r32 series 1
r32 series 2

all slightly different i think

rb25

series 1 33

series 2 33

whats the other one?

rb26

32 gtr
33 gtr
34 gtr

plus the n1 versions of each... more then 3

Neo RB25DET and RB25DE also

[JILTED]

There was actually a N/A RB26DE as well. I forget which car it came out of.


old school GTR's

[SYK STI]

rb20 - more then 4 i reck

hr31 nics
hr31 non nics
cefiro
laurel
r32 series 1
r32 series 2

all slightly different i think

rb25

series 1 33

series 2 33

whats the other one? s1 s2 neo

rb26

32 gtr
33 gtr
34 gtr

plus the n1 versions of each... more then 3

neo neo neo neo

[MrSparkle]

ok im new to all this business so forgive me if i make stupid mistakes
ive put a rb26 in my r33 instead of modding the rb25 becuase for the extra cost you get piece of mind - its not gonna break
- with standard shit it makes 300 and its not a shit 300 either its got top end midrange and its even got off boost performance not that it matters cause your not off boost for very long i know the initial expenditure might seem a bit severe but its probably worth it in the long run with basic mods ive got 320 (cooler + exhaust) the car fries tyres ,goes fast ,isnt laggy got stacks of mid and if you compare my car to a rb25 spitting out 350 say with a high flo im probably faster becuase of the lack of lag mid range punch and just general driveability but you have to decide what you want your car for so my advice is to work out what you want to do its not overall power that makes the car fast anyway people will say woah rb20's can make as much as rb25's but drive the two and decide which is better rb20 got nothing till 5 or rb25 starts to move at 3500 that 1500 makes a hell of a difference in real life and on the track anyway thats my 2 cents