Rb26 Engine Choices

[SysLink67]

After reading alot of threads, posts and infomation from PM's I'm left feeling like my mind is scattered in a thousand directions, kinda like the result of a bull in a china shop.

So I guess I'm after abit of direction.... what better place then here:)

MY GOAL :

RB26 DETT Built to be responsive and very punchy.

Very torque’y through the mid range.

It’s paramount for ENGINE to be reliable AND STRONG.

Its main use will be a street weapon

I currently have :

Tomei Poncams Type B 260 / 260 9.15 lift

Garrett 2860-r turbos

700cc sard inj's

040 bosh fuel pump - intank

Nismo Fuel reg

Apexi Power FC D-jettro

Spitfire coil packs

TRUST FMIC

Sard racing radiator

Full Dual racing N1 spec Kakimoto exhaust. Dual 75mm pipes back to each dump.

Apexi intake pipes and pods

ATM I'm favouring a RB26/30 hybrid for torque and powerband it enables the engine to have. Without having to do insane revs...

Although I have heard a 2.8HKS step 1 stroker kit is very good also...

Any advise from people who actually have such configurations in their GTR's or have some exp in dealing with such engine configerations.

Thanks in advance.

Rob

[bloodzkull]

also wouldn't mind finding out what others have done and thier experiences with them. the idea of a 3 ltr with lightned pulleys and flywheel and everything else to help it rev better does really appeal to me.

[EVIL TWIN]

I don't have any personal experience with this since mine is still 2.6L, but if the 3L appeals to you, rather than using an RB30 bottom end (which isn't as strong as the RB26 due to lack of internal bracing), how about an OS Giken 3L kit? It actually uses a big spacer between the head and block, increasing the stroke and retaining the RB26 bottom end.

The HKS 2.8L kit would probably get you what you want if you had smaller turbos (from videos I've seen with 2530 or 2540 turbos) but the OS 3L would get the 28 series or larger turbos spooling much quicker to get your punchy torquey mid-range.

I would personally probably go the OS 3L or HKS 2.8L before a RB26/30 hybrid.

From what I've heard, a HKS V-Cam system (variable valve timing on inlet side) would help in that area also, but I don't know if you can actually get hold of one. On one of my Hot Version DVD's Keichi Tsuchia drives an R34 with it turned off and then turned on, and it made a big difference to the rate of acceleration. It had a TO4Z though.

[Adriano]

Good points, but have you actually priced any of these components, i believe an OS 3 lt is in the vicinity of $30k, and the HKS v cam is about $8k, and i dont think its made anymore. If you have the budget, and dont want to stuff around, the stroker cranks are probably the way to go, as they are far simpler than an rb30 conversion

Edited November 7, 2007 by Adriano

[r32-25t]

if it was me the hks 2.8l kit would be the way to go, every hybrid rb30 ive seen in a gtr has been a disaster

they usualy foul on everything and have oil issues and alot of them leak oil because of the spacer block for the sump

just my 2 cents

thanx brett

[infamous_t]

IMHO... RB26/30 if you put a hole/crack in your block, 2.8L Stroker if you don't.

[EVIL TWIN]

yikes! 30k for OS kit?! I had no idea!

Oh well, the 2.8 sounds like the way to go then

[s13_Skyline_inside]

i dont think the os giken 3ltr kit is anywhere near that price, i know otomoto in syd sells os giken stuff, ok i was wrong these things are farkin expensive not 30k but close enough to it here's the link http://www.otomoto.com.au/osgiken/RB30_race_engine.htm

3ltr is 23.500k and the 3.1 ltr kit is 25.500k

and as r32-25t said 3ltr in a gtr has its issues, add an extra 30mm to the top of the engine for the extra capacity and add another 10mm to the bottom of the engine for the spacer plate (only need the spacer plate if you run an rb30 block) you cant really go to far moving the engine up or down in a gtr cause of the front drive shafts, move them to much and you chew the front wheel bearings

if you went the os giken way you just have to worry bout the 30mm on the top of the engine, mayby just raise the bonnet a bit if you had clearance issue's so you didnt have to mess with the orientation of the drive shafts.

anyway if i had a gtr and was making this decision id go the hks 2.8 kit, good internals, cheaper than the os kit, not as much stuffing around with the hight etc

hope this helps

[s13_Skyline_inside]

just read a bit about the os kit, price would be ok considering you get a new block and it all comes assembled with the good bit, so 3ltr giken kit would be awsome if you dont care about a bit of fab work on bonnet etc

[jonn]

That price is just the bottom end. Got to put head, manifolds, turbos and everything else on top of that. Also have to buy th OS clutch to match it. So yeah I reckon you would be looking at close to 40k to finish it off properly.

[rev210]

I don't have any personal experience with this since mine is still 2.6L, but if the 3L appeals to you, rather than using an RB30 bottom end (which isn't as strong as the RB26 due to lack of internal bracing), how about an OS Giken 3L kit? It actually uses a big spacer between the head and block, increasing the stroke and retaining the RB26 bottom end.

The HKS 2.8L kit would probably get you what you want if you had smaller turbos (from videos I've seen with 2530 or 2540 turbos) but the OS 3L would get the 28 series or larger turbos spooling much quicker to get your punchy torquey mid-range.

I would personally probably go the OS 3L or HKS 2.8L before a RB26/30 hybrid.

From what I've heard, a HKS V-Cam system (variable valve timing on inlet side) would help in that area also, but I don't know if you can actually get hold of one. On one of my Hot Version DVD's Keichi Tsuchia drives an R34 with it turned off and then turned on, and it made a big difference to the rate of acceleration. It had a TO4Z though.

For the record the Rb30 block is every bit as strong as the RB26, it doesn't lack internal bracing.

Take some time to read up on this forum about this combination and how good it is, you will be plesantly suprised.

[Beer Baron]

there is one crucial part missing here. budget? how much do you want to spend (this will become the min) and how much can you spend (this is your max!).

I mean if money is no object then for me the choice would be:

new N1 or GT block

HKS S3 2.8

enlarged sump

tomei oil pump

HKS 2530s or T04Z

manifolds

dumps

fully ported head, with new springs etc

V-cam

bobs you're uncle but you are now $50K or so poorer.

[rev210]

After reading alot of threads, posts and infomation from PM's I'm left feeling like my mind is scattered in a thousand directions, kinda like the result of a bull in a china shop.

So I guess I'm after abit of direction.... what better place then here:)

MY GOAL :

RB26 DETT Built to be responsive and very punchy.

Very torque’y through the mid range.

It’s paramount for ENGINE to be reliable AND STRONG.

Its main use will be a street weapon

ATM I'm favouring a RB26/30 hybrid for torque and powerband it enables the engine to have. Without having to do insane revs...

Although I have heard a 2.8HKS step 1 stroker kit is very good also...

Any advise from people who actually have such configurations in their GTR's or have some exp in dealing with such engine configerations.

Thanks in advance.

Rob

Hi Rob,

I'm in the process of building an Rb30 bottom end for my bunky gtr. I started going down this path some years ago for pretty much the same reasons you are now looking at it.

Really the Rb30 setup gives you a fantastic rod ratio as well as more capacity, so if you build it right you can have a fair whack of an rpm range as well as capacity.

I'm dobbing Sydneykid in for some very good guidance on doing a decent 26/30 build ( PM box will fill shortly --- sorry mate).

Cheers

Dave

[STATUS]

Dont forget the NISMO 2.8l kit, every bit as good as anything else.

[sewid]

HKS no longer sell a Step 1 2.8l kit. Step 3 or nothing anyway. You might find a Step 1 second hand or old stock but people snap them up from what i've seen. Also you can have a brand new HKS V-Cam system landed for well under $4k forget that $8k price tag. Still mega dollars though.

I personally wouldn't touch a 26/30 hybrid with ten 10 foot poles joined together. A lot of other guys will say the exact opposite though and love them to bits. Each to their own.

[EVIL TWIN]

For the record the Rb30 block is every bit as strong as the RB26, it doesn't lack internal bracing.

Take some time to read up on this forum about this combination and how good it is, you will be plesantly suprised.

I wasn't saying it wasn't any good, just not AS good.

Just going off info I have read on these forums and magazines, I was lead to believe that the RB26 block had extra internal bracing to handle second (or third? can't remember) order harmonics present in the high end of the rev range (not entirely sure what revs, but somewhere around 8000). The RB30 was never meant to rev past about 7000, so as long as you don't go that far, the extra bracing probably isn't be needed. The RB26 however is designed to rev to over 8000 where second order harmonics are present, so the extra bracing was added to handle it, even as far as 10,000. The same can not be expected with an RB30 block.

Now I don't pretend to know much about engine harmonics, I'm just regurgitating what I've read, so if any of that is off, I'm qhite happy to have it staightened for me

Edited November 8, 2007 by EVIL TWIN

[stolen_s15]

there is one crucial part missing here. budget? how much do you want to spend (this will become the min) and how much can you spend (this is your max!).

I mean if money is no object then for me the choice would be:

new N1 or GT block

HKS S3 2.8

enlarged sump

tomei oil pump

HKS 2530s or T04Z

manifolds

dumps

fully ported head, with new springs etc

V-cam

bobs you're uncle but you are now $50K or so poorer.

If funds were unlimited this is waht I would do. The HKS ultimate street car ran this setup with a T04Z and looked amazingly powerful and very driveable.

[TTT]

I personally wouldn't touch a 26/30 hybrid with ten 10 foot poles joined together. A lot of other guys will say the exact opposite though and love them to bits. Each to their own.

what are "your" reasons?

[GTS4WD]

I think, bang for buck, 26/30..

It meets the requirments and is relativly cheap comparied to the other options..

Parts are quite readily available..

Just seems like the right choice..

[sewid]

what are "your" reasons?

No real tangible reasons. It's just not for me and I can't see myself ever putting in the effort to have a 26/30.

To those who done it, good work. I'm quite happy with a standard displacement engine.