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What Is Better Rb30et Or Rb25det

AAA34T

By AAA34T,
in Classic & Vintage (1950's-1980's)

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Adam_RSX Proficient

Adam_RSX

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I say go with an RB30E + T, it would be far more driveable in everyday driving, I think it would probably be better in the hills with extra torque compared to a bit of extra breathing ability and I'd have to think it would be far cheaper and just as reliable as an RB25 at the power levels you're after

AAA34T Community Regular

AAA34T

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I am sick of the power that the car has got now i want easy 13 sec quatermile. I am happy with that so what ever it takes i wont say no if it goes quicker but it must be very reliable. i hate cars that have had all this money spent and they live in a work shop.

george.bryant Rising Star

george.bryant

Posted
Posted

rb30det seems logical. Is there such a thing as a RB30et anyway?

RB30e Block rebuilt with a RB25DET VVT head on it would be the way to go i reckon. It is a very debateable topic...

I've attached a RB30DET build guide.

RB30_DOHC.pdf

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
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 :angry: hehe

dunno who was using c16 and semi's... but it certainly wasnt me :)

And there are plenty making 250rwkw these days on stock RB25 (more actually)

Beats having to spend $$$$ on lots on SOHC head work :blink:

And what does the r31 club time have to do with it again?

Ifwe wanna get technical we can

slow_r31 Collaborator

slow_r31

Posted
Posted (edited)
dunno who was using c16 and semi's... but it certainly wasnt me    :D

And there are plenty making 250rwkw these days on stock RB25 (more actually)

Beats having to spend $$$$ on lots on SOHC head work :D

And what does the r31 club time have to do with it again?

Ifwe wanna get technical we can

was just some tongue in cheek stirring, nothing meant by it, i acutlaly thought u used c16 for that time, my bad.

the point with the r31 times was just an example that rb30E bottom end is just as strong and can take just as much power. im sure there are examples both ways however.

i have a RB30E+T, its done 200,000k's, gives me 10L/100k's fuel economy, has shit loads of torque and makes ~160rwkw everyday.

both motors are reliable, and ull make your 180rwkw on stock turbo/injectors, the only real difference is slight cost difference, and the feel of the motor

go for a drive in both and see which u like, the torque of the 30, or the revabilitly of the 25.

Edited by slow_r31
spx25t Community Regular

spx25t

Posted
Posted

I would recommmend the RB25DET I have one fitted in my R31 using a turbo of a VG30DETT which I believe is the same size as standard just Ball Bearing running 14psi it makes 183 kw's at the wheels and I have run a best of 13.3 over the 1/4 @103MPH using cheap street tyres(TRX Rims for racing 17's for the street) my car weighs about 1400 kgs. For reliability I have been running that boost level for the last 18 months(54,000kms) since I purchased the car and it has not missed a beat once.

I have been to 2 Powercruise events each one consisted of 4 days(ECR). Drag Combat twice (WSID) and about 5 or 6 Street meets (WSID). all that plus I drive the car everyday to and from work which is about 400+ kms a week and I get just over 400kms to a tank of fuel.

: ) hope this helps somewhat with your decision

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