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Disadvantages Of An Rb30?

ynhrgt

By ynhrgt,
in Engines & Forced Induction

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TTT Grand Master

TTT

Posted
Posted

kinda off topic, but what I'd really like to see (well more so HEAR) is an RB31 hi compression in NA form using the 6 throttles with trumpets on them, with a hi flowing exhaust.

sure might not make the power of the turbo ones, but it would sound awesome.

even more off topic, anyone got that video clip of the original race GTR which they pulled out for a few laps of some jap circuit that was being renovated or something..

awesom sound...

Scooby Veteran

Scooby

Posted
Posted
As for talk about RB30s beign truck engines, its kinda funny. You look at M3s, some of the greatest 6 cylinder engiens gettign aroubnd, you read the reviews of its revvy nature etc...yet ppl seem to think dynamically the RB30 cant rev ????

yes but spend m3 engine $ on an rb30 and the rpm outcome might be impressive. not the same of course because bmw are vv smart, but impressive nonetheless.

Roy Grand Master

Roy

Posted
Posted
yes but spend m3 engine $ on an rb30 and the rpm outcome might be impressive. not the same of course because bmw are vv smart, but impressive nonetheless.

Sorry, I wasn’t being very clear with my post. Basically the RB30 has an 86 x 86 bore and stroke. And people say that the long stroke etc amongst other things means it wont rev hard. But you look at the latest M# which is generally considered to be a banshee and revs happily and it has an 87mm bore and 91mm stroke. So it actually has a longer stroke then the RB30 which invariably means higher piston speeds etc etc.

So dynamically there is no reason why an RB30 cant rev hard. Ok, fair enough cams may hurt power up top unless something has been done in this area, but if the rods a re good quality and balanced well,, ditto the pistons, especially with a turbo on the side of the thing it should happily pull good revs.

benl1981 Grand Master

benl1981

Posted
Posted

This talk of balancing etc.. I hear that some guys here are using old 270 000km bottom ends..doesn't sound like they care too much about balancing.

For a street car looking at 240-260rwkw - would you just buy a RB30 bottom end - if the pistons look ok just put new rings on and new big end bearings? Rehone it..

Would you really need to balance? Only plan to rev it to 6500rpm

Just going to be putting a lot of kays up on the car for new job so thinking of building a spare bottom end for if and when it needs a freshen up..

Also what turbo - GCG standard highflow...Would this not choke it up high..?

Sorry to deviate a bit.

paulr33 Grand Master

paulr33

Posted
Posted

yeah i think the hiflow is too small for the rb30det

i think the gt30 is the smallest you can run that wont run out of puff

and even that is still a bit too small, i think the gt30r or gt35r is spot on

Craved Grand Master

Craved

Posted
Posted
This talk of balancing etc.. I hear that some guys here are using old 270 000km bottom ends..doesn't sound like they care too much about balancing.

For a street car looking at 240-260rwkw - would you just buy a RB30 bottom end - if the pistons look ok just put new rings on and new big end bearings? Rehone it..

Would you really need to balance? Only plan to rev it to 6500rpm

Just going to be putting a lot of kays up on the car for new job so thinking of building a spare bottom end for if and when it needs a freshen up..

Also what turbo - GCG standard highflow...Would this not choke it up high..?

Sorry to deviate a bit.

would you just use the RB25 to make that kind of power rather than go to all the hassles of building the rb30 and swapping the engine, blue slip with new engine etc?

easy make 260-270 rwkw with std rb25..

personal choice for sure. then again, you might be in an r32 for all i know lol so then i would do it :whoops:

sky30 Mentor

sky30

Posted
Posted
would you just use the RB25 to make that kind of power rather than go to all the hassles of building the rb30 and swapping the engine, blue slip with new engine etc?

easy make 260-270 rwkw with std rb25..

personal choice for sure. then again, you might be in an r32 for all i know lol so then i would do it :whoops:

An RB30 with 260rwkw makes alot more torque than a RB25 with 260rwkw, some people swap to the RB30 because of the better drivability, and lots of extra torque.

Craved Grand Master

Craved

Posted
Posted
An RB30 with 260rwkw makes alot more torque than a RB25 with 260rwkw, some people swap to the RB30 because of the better drivability, and lots of extra torque.

fair call!

anyone noticed any increase i fuel consumption with the lower powered (220rwkw etc) RB30's V's RB20 or RB25's?

benl1981 Grand Master

benl1981

Posted
Posted

Well I'm also considering the cheaper option...It's only if my motor bombs out..

If I have a 3L bottom end with a freshen up there it is cheaper than an imported RB25 engine.

Anyone have any comments on my questions above? Maybe I should make a new post or something..

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted
fair call!

anyone noticed any increase i fuel consumption with the lower powered (220rwkw etc) RB30's V's RB20 or RB25's?

Im getting around 10L/100Km atm out of an untuned pfc.

I cant run it up on boost, due to the coil packs wont take it (break down and piung like a bitch)

Its makes hella fuel economy as everyday driving is under 3500 rpm.

Craved Grand Master

Craved

Posted
Posted
Im getting around 10L/100Km atm out of an untuned pfc.

I cant run it up on boost, due to the coil packs wont take it (break down and piung like a bitch)

Its makes hella fuel economy as everyday driving is under 3500 rpm.

hmm thats what i used to get out of the std RB25.. will have to see. looks like there isn't much difference between the rb30 vs rb25 etc..

get a nice tune and that should improve i'd be thinking!

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