Rb26 n1 block vs rb30

[jthefreeker]

what is the better pick for my rb26 head and why? :2f2f:

[Leo-kun]

RB30?

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[fliprayzin240sx]

Depends, how hard core is this engine gonna be? Do you want a drag queen or a response monster for auto-x, track/touge? Drag queen, RB26...RB30 for the latter.

[jthefreeker]

i want to get about 700hp and have an awesome project but still daily driveable.

[jthefreeker]

RB30?

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Its an rb that in most cases be found in australia or newzealand

[OBEEWON]

RB30 hands down. Anything the Aussies use makes sense.

[jthefreeker]

RB30 hands down. Anything the Aussies use makes sense.


i like the way you think but can you tell me a bit more about why the rb30 is better than thrb26 n1

[GSXRJJordan]

RB30 is stroked, so it makes more usable torque, lower in the RPM band (as well as being higher displacement, for additional torque all over). That's where I think Ray was going above.

For me, I went RB25, because I don't want to pay for 700hp... but if you were going to go big power, and didn't want to go V8, RB30 would give you the most favorable powerband for auto-x, road course, etc.

[Koopa Troopa]

In what car?

[jthefreeker]

In what car?


Im putting it in a 240z

[jthefreeker]

the thing is how easy is it to find after market parts for the rb30 block? (pistons, con rods, crank shaft, etc.

[genericforumname]

to me it sounds like you are starting your research in the wrong place, you should start with trying to find builds similar to what you want to do with whatever engine your looking at and what each is actually capable of.

also so far as I'm concerned 700hp is never "usable" power, anything in a 240z over 350 to the wheels and you have a car that's just a hassle to drive, especially in the city doable yes, but I don't think 700hp in a car like that is going to be as great as you think.

And as far as parts goes, I would have to assume that getting a part for an engine that is not only not in any car ever shipped to America and very rarely used in America(so far as I have seen, maybe 2 in the U.S.?) would potentially be a nightmare, if no other reason than shipping from overseas is expensive.

[GSXRJJordan]

to me it sounds like you are starting your research in the wrong place, you should start with trying to find builds similar to what you want to do with whatever engine your looking at and what each is actually capable of, so far as I'm concerned 700hp is never "usable" power, anything in a 240z over 350 to the wheels and you have a car thats just a hassle to drive, especially in the citydoable yes, but I dont think 700hp in a car like that is going to be as great as you think.

And as far as parts goes, I would have to assume that getting a part for an engine that is not only not in any car ever shipped to America and very rarely used in America(so far as I have seen, maybe 2 in the U.S.?) would potentially be a nightmare, if no other reason than shipping from overseas is expensive.

Although I completely agree, I'm going to play devil's advocate:
1) My dad's Corvette (C5 Z06) has close to 700 crank hp (560whp) in a 3100lb car, and is completely streetable - it's actually a little tame, for my taste, with a soft twin-plate clutch and the stock Ti 3" exhaust - I like my cars with a little personality lol.

2) Getting most Nissan parts for RB30 isn't any harder than Rb25/26 - WestCo Nissan (among others) can not only get any JDM parts, but Ray @ WestCo (Zilvia username is Swayray) actually has had every RB part I've needed for my rebuild [b]in stock[/i] except for one trans seal. I am continually blown away with how easy it is to find JDM stuff here now.

Aftermarket parts, on the other hand, are a little harder to come by when they're specific to the RB30 (pistons/head gasket/etc), but not too much so.

While I can't help but notice that the OP has been making a lot of "dream-build"/"what-if" posts lately, I can only hope that he's actually going to follow through, so I don't mind throwing in my $.02 :)

[bluevelvet]

hmmm.. interesting... couldnt you be able to use pistons and Rods from other cars just slightly modified... in the Club lexus Forums people would Use Chevy Parts that were slightly modified to fit the 1-UZ V8 engines.. also.. some even used Prius parts for their Builds..

but either way.. it seems like a PAIN IN THE ASS to Build a RB30 here in AMERICA..

what about the RB28? is that even more Rare?? i know it exists in Australia..

[ZenkiCam]

Although I completely agree, I'm going to play devil's advocate:
1) My dad's Corvette (C5 Z06) has close to 700 crank hp (560whp) in a 3100lb car, and is completely streetable - it's actually a little tame, for my taste, with a soft twin-plate clutch and the stock Ti 3" exhaust - I like my cars with a little personality lol.

2) Getting most Nissan parts for RB30 isn't any harder than Rb25/26 - WestCo Nissan (among others) can not only get any JDM parts, but Ray @ WestCo (Zilvia username is Swayray) actually has had every RB part I've needed for my rebuild [b]in stock[/i] except for one trans seal. I am continually blown away with how easy it is to find JDM stuff here now.

Aftermarket parts, on the other hand, are a little harder to come by when they're specific to the RB30 (pistons/head gasket/etc), but not too much so.

While I can't help but notice that the OP has been making a lot of "dream-build"/"what-if" posts lately, I can only hope that he's actually going to follow through, so I don't mind throwing in my $.02 :)

are you forgetting something here? :eek: hes wanting 700whp in a car that weighs near 1000 pounds less.... and this dude will probably do some weight reduction.. thats a big difference.

oh and as far as building the motor, parts are relatively easy to find.. heres where you can get all your forged items, http://www.spoolimports.com/content/RB30ET&RB30DET.asp

and as far as building the head, well you would be using an RB26 head anyways so you could definitely find parts for that.

[genericforumname]

yes but what I really didn't want to touch is the basics of the chassis design itself, the modern corvette's are fucking great, if I could get one I would, its a solid frame design with, lets face it, the only really great V8 series left, but that car is designed with that in mind, I've seen videos of replica Devil Z's and ls7 Z's and the only thing all high hp Z's(the old 240z not modern Z's) seem to have in common is severe problems delivering that power, one damn near goes sideways just stepping on the throttle, and having to correct his steering to make sure hes still going straight, plus I would imagine you would get axle wrap as well, sure you could redesign and rebuild it to handle it but if you have that kind of money or know-how, you probably would just pay someone to do it or just jump headlong into the project anyway.

on a side note, I can honestly say that I hate GM, and I am biased against a lot of their cars, I feel they've made nothing but dog-shit for the last 30 years, but god-damn can they make a great V8 (also I can honestly say the new CTS-V makes my pants tight)

FUCK, now I want a Cadillac, I feel like I have to kill myself for saying that.

edit: I wasn't even thinking of weight I was thinking of the example given of auto-x, you just can't use that kind of power on a tight auto-x style track, unless you guys in California have much different ones than we have over here.

edit#2: FUCK, now I want to see someone build a crazy rb30...someone get on that shit, now. also we on the east coast don't have any awesome dealerships like that so I guess it depends on where you're at in the world.(no, I don't consider parts that have to be ordered on-line orders "accessible")

[GSXRJJordan]

FUCK, now I want a Cadillac, I feel like I have to kill myself for saying that.

Lol, I had a couple of those moments - one when the first CTS-V came out, and again when the new one trounced the V10 M5 in every test.

edit: I wasn't even thinking of weight I was thinking of the example given of auto-x, you just can't use that kind of power on a tight auto-x style track, unless you guys in California have much different ones than we have over here.

I've autocrossed that car and taken it through some technical canyons with stock (lowered) suspension, upgraded Baer brakes, and stock-tire-size'd Michelin PS2's - the power's so linear and the chassis is so balanced that you move into and out of traction without any perceived loss of speed... but that's just my seat-of-the-pants feel. The numbers confirm that it's fucking fast lol. A Z-chassis, with turbo spool to worry about, would not be as easy to work with, but I still don't see it being "not fun".

[genericforumname]

but that's kind of my point, the corvette is just such a different car, if you just took that engine out and stuck it into 240z, I would consider that for deathtrap status, and I think everyone knows that regardless of what the car is used for skill with the car can overcome any shortcomings, but I just don't see the poster as one to have said skill (not trying to be an ass) I'm not saying if someone tossed me the keys I'd tell them they built a lame-ass car, I'd drive that shit into the ground but I would never want to daily it, I enjoy having some skill with throttle control and holding myself back on streets (I actually go the speed limit on University, people from central Florida) but I don't want to HAVE to be super light on the throttle when driving in stop and go city traffic.

p.s. the m5 was my dream car for years, sexy and capable, then the CTS-V does it better and cheaper and I felt like I had wasted years of my life, also, for the first time in history you can legitimately call an M5 a piece of shit(comparatively) and that it was done by Cadillac just blows my mind, like if I was on acid and someone told me that I'd trip into mental psychosis

edit: also I never said it wouldn't be fun, I'd wreck that cars asshole frequently (possibly lose my license), I just wouldn't want to daily it, and lets face it, most peoples "projects" end up being daily's (at least as far as I can tell)

[jthefreeker]

are you forgetting something here? :eek: hes wanting 700whp in a car that weighs near 1000 pounds less.... and this dude will probably do some weight reduction.. thats a big difference.

oh and as far as building the motor, parts are relatively easy to find.. heres where you can get all your forged items, RB30ET & RB30DET - Spool Imports - Japanese Performance Parts (http://www.spoolimports.com/content/RB30ET&RB30DET.asp)

and as far as building the head, well you would be using an RB26 head anyways so you could definitely find parts for that.


Your right im doing weight reduction and im also building up the suspension real nice

[Koopa Troopa]

2) Getting most Nissan parts for RB30 isn't any harder than Rb25/26 - WestCo Nissan (among others) can not only get any JDM parts, but Ray @ WestCo (Zilvia username is Swayray) actually has had every RB part I've needed for my rebuild [b]in stock[/i] except for one trans seal. I am continually blown away with how easy it is to find JDM stuff here now.


That'd be awesome if the RB30E was actually offered in Japan....:mepoke:

[GSXRJJordan]

That'd be awesome if the RB30E was actually offered in Japan....:mepoke:

ZING! Got me. Nissan somewhere has part numbers for stuff, and Ray has multiple computer systems to look 'em all up.

To the OP, check out Luke's (Blu808) build thread with the RB26 280Z. It's pretty epic, seems to be right up your alley - all Arizona Z Car products, custom mounts, nice paint/body, and of course the Rb26.

[mugendork]

do it. I promise that car will be the most suicidal scary car you will ever drive. Yes it is retarded, and yes you will get in trouble with it. But if you have the funds, know-how and everything that goes along with a headache like that, it will be fun in the end...but honestly? 700hp in a S30 is just retarded. I had 400hp in my old Porsche 914 that weighed 1900lbs...and that was stupid... I could not imagine 700hp in a street car that small. I guarantee after the first drive you will not be able to open the doors. Think about that one.

my $02

[kalypso123]

nico has a nice rb30 build...

right here (http://forums.nicoclub.com/zerothread?id=368405)

[jspecusa]

just put in a stock rb26 and boost up with boost controller to 1bar normally and 1.2bar in race gas.
you'll see that your s30 don't need anything more then that.
sometime when you see a number for a hp you don't know what's involved getting to that high of number and cost.
good luck,

sam

[Ali 556]

dunno,

2JZ-GTE is 3.0 and the TOTAL cost will be less than the RB26\30....and you can strok it to 3.4L

and LS1's are made cheap...the T-56 is the killing point tho

consider EITHER for better $$$/Whp then the RBxx

[genericforumname]

nico has a nice rb30 build...

right here (http://forums.nicoclub.com/zerothread?id=368405)

nice, I love seeing people just make shit work, if it doesn't fit 10$ says you can grind something down to make it fit.

Also didn't know so many parts are interchangeable between different sized RB's

back on topic, as long as you strengthen the frame and know how to drive the car I think it could be done well, but I would suggest taking the advice of jspec and install a stock rb26 and see how that goes, you'll get a much better idea of whether you want 700+, you may find that 4 or 5 or 6 hundred is more what you want, plus it'll (potentially) save you a shitload of money.

edit:wasn't the rb30 used in some crazy ass Chrysler or something? (does Wikipedia search) damn, Holden has had some crazy cars, they got the rb30 and made the new GTO? I kind of wish I lived in Australia. too bad their laws blow so hard

[rbs14kouki]

for a rb26 head i would go for the rb26 block !!! with a rb25 head it's mutch more easier to do the rb30 conversion

[jthefreeker]

do it. I promise that car will be the most suicidal scary car you will ever drive. Yes it is retarded, and yes you will get in trouble with it. But if you have the funds, know-how and everything that goes along with a headache like that, it will be fun in the end...but honestly? 700hp in a S30 is just retarded. I had 400hp in my old Porsche 914 that weighed 1900lbs...and that was stupid... I could not imagine 700hp in a street car that small. I guarantee after the first drive you will not be able to open the doors. Think about that one.

my $02


but i am going to gradually build it up to what i want so I might just finish it around 550 who knows.

[jthefreeker]

so far no one has told me what engine block is better. what ive heard are personal suggestions. could we get some pros and cons?

[fliprayzin240sx]

Theyre basically the same fucking block, RB30 block is bored out a bit iirc, it makes up the displacement more on the stroke more than anything else. There's no pros or cons if your just talking about the block. RB30, you're more than likely gonna start from scractch. I would personally find a stock RB26 bottom end and just run with it.

Which one is a better block is up to you, your application and what the fuck ever your planning on doing to it.

[rbs14kouki]

rb30 dont have oil squirters
rb30 have smaller Head bolt compare to the rb26 head (but same size as rb25 head)
rb30 need a custom x2 idler set-up for the timing belt(with special timing belt)
to fit the 4wd on the rb30 you need a custom adapter plate
rb30 is taller = hood clearence problem
crankcollar need to be upgarded

ect

[Koopa Troopa]

I hear Rb30 has a lot of harmonic vibrations at high RPM due to the taller deck height. However I like the bore and stroke.... 86x85. Almost a box. Rb26 would be easier and the extra 300cc's isn't going to make a fucking difference anyways.

[rbs14kouki]

I hear Rb30 has a lot of harmonic vibrations at high RPM due to the taller deck height. However I like the bore and stroke.... 86x85. Almost a box. Rb26 would be easier and the extra 300cc's isn't going to make a fucking difference anyways.

to correct that you could balance your internal and buy a harmonic balancer(ATI/ROSS) !!! but it's $$$$$

[GSXRJJordan]

I hear Rb30 has a lot of harmonic vibrations at high RPM due to the taller deck height. However I like the bore and stroke.... 86x85. Almost a box. Rb26 would be easier and the extra 300cc's isn't going to make a fucking difference anyways.

How can you say that a 12% displacement increase doesn't make a difference?? That's 60 free ft-lbs if you're at 500, and when coupled with the spool advantages, could net you even more than 12% more area under the curve.

Don't ever forget, there is no replacement for displacement, it's king!

to correct that you could balance your internal and buy a harmonic balancer(ATI/ROSS) !!! but it's $$$$$

Exactly, the ATI balancer isn't thaaaaaaaaaat expensive - you have to live in Baller Nation to even think about a RB30 build, so an extra $500 for a nice drivability increase is not a big deal.

[jthefreeker]

my theory now is the rb30 block is 5x cheaper why not get one because its not that much different from rb26 block strength and will allow alot more torque. Am I getting it down straight?

[jthefreeker]

to correct that you could balance your internal and buy a harmonic balancer(ATI/ROSS) !!! but it's $$$$$


:sadwavey:It says that the balancer is for rb26 will it fit the rb30?

[C-unit]

yes it will. If you want to see some local RB30 build. Go to GTRcanada and theres a GTR project GTR section. Check out the Project Horny thread. Felix has a crazy RB30 GTR built from ground up.