Building An Rb26 For Response....

[Wongy]

That does make helping harder, where are you located

What you might have to do is rip off one of the cam covers and get the part number off the end of the cam cause if their not poncams but full aftermarket then poncams may not be "boltin" any more in which case you may as well go the 260 x 10.8 procam or better yet the unigroup cams

Located in Warrick Farm area, between Cabra and Livo, hmm, i'm not very confident in doing that myself xD might need some help.

[Sub Boy32]

Want response.....More cubes!

[Piggaz]

Want response.....More cubes!

Won't rev then, geez.

[Sub Boy32]

Won't rev then, geez.

Bahaha.....oh yeah, forgot about that, my 9000rpm rev limit is soo lame

[XKLABA]

Bahaha.....oh yeah, forgot about that, my 9000rpm rev limit is soo lame

I know right, having 3ltrs AND 9k rev limit sux, how ever will we live with it ?

[Sub Boy32]

I know right, having 3ltrs AND 9k rev limit sux, how ever will we live with it

Haha! I think we'll manage!

[vorse]

6262 bb on a 2.6 vs -9s i cannot decide which

some one want to weigh on which would be better for response

power goal is 400kws on e85

[Hadouken]

-9's won't get you there.

[r32-25t]

You'll have to go the 6262 out of those choices due to the fact -9s won't make 400wkws

[zebra]

I know right, having 3ltrs AND 9k rev limit sux, how ever will we live with it ?

You can't because it wont sounds nice

[Duncan]

I didn't intend to get involved in the usual FIP section pissing contest.....just to make the point that if your tuner says they "tuned for response" without changing anything mechanically you better find a tuner who isn't talking shit.

Jimmy, I was listing mechanical factors that affect response; once the mods have started most people forget how early the standard setup gets on boost. I built the stagea deliberately for response which is why it has standard zorst manifold, standard cams, standard head, small turbo and 3 litre bottom end. And it makes 18psi by 3200 rpm

If I wanted more response I would add cam gear (as I have on the race car), it can bring on boost a few hundred revs sooner at the cost of top end power. But frankly it comes on hard enough early enough to empty the fuel tank quickly.

For a race car I would say it is a very different concern. Full boost at 5 or even 5.5 is adequate especially if you have short gears and a standard or raised rev limit.

[Sub Boy32]

You can't because it wont sounds nice

Not that I'm sure that anyone would be able to hear the difference.....but if all you are worried about is the sound, you must also be the type that buys cars on how many cup holders it has!

[XKLABA]

Not that I'm sure that anyone would be able to hear the difference.....but if all you are worried about is the sound, you must also be the type that buys cars on how many cup holders it has!

Shut up mate, I do that, my new car has 10 cup holders ?

[Sub Boy32]

Shut up mate, I do that, my new car has 10 cup holders

Bahaha! Alcoholic!

[skidmarx]

For me,

Bottom end:

Standard rb26 crank, nitrided, chamfered oil holes, Standard rods resized and shot peened,

Hypertectic pistons, id have to look into brands before deciding, but i do not believe forged slugs are required, pistons to suit 10.5:1 comp with valve relief's, steel comp rings, low tension oil rings, restrictors fitted to oil feeds and head/block returns drilled out

Head: stock valves, heavy springs, cams 260/262 10.5 lift dialed @106/110, a good throat job and trim valve guides, head decked to suit chosen pistons,

Turbo and pipes: small diameter high mount turbo manifold, hks 3037s, 50mm gate with 2inch open screamer, 3 inch dump, no cat or mufflers, strait to the rear

2.5inch stainless cooler pipes to replacement factory sized cooler, water/meth nozzle directly before inlet to plenum,

Id run 18-20psi, i believe a good tuner could really lean on this combo and make a rediculasly responsive weapon that packs a punch

Hmm, first question to get a post out of me in a while lol

[GTRPSI]

Lets not forget the key point to making response as to a revy engine.

Light recipricating weight in the engine.

Lightest pistons and rods, crankshaft and flywheel.

Gearing helps to enhance the free rev nature when on power.

Dont get too carried away though, a clutch dump start can lead to a serious bog down on launch.

Turbos, cams etc work with on power driving response as does a smaller volume intercooler etc.

Edited February 19, 2014 by GTRPSI

[discopotato03]

You can look at this another way by thinking what Nissan would have done if they wanted road car like characteristics in a GTR . I think the logical solution is to start with a Neo 25T Stag engine and build it up to a level rather than trying to convince RB26 to do what it wasn't intended to . Don't hate me people but I consider an RB26 a dumb road engine in some ways because Nissan didn't put any of the smarts into making it a nice road car engine . It was intended to be a bit of a hero drive because the basis was for a road race GT car not an all round street car .

The Neo has a higher CR and the last big bore (86) turbo RB revision of chamber and piston crown shape . The whole inlet exhaust and turbo systems are designed to make good part throttle torque which is what any successful ROAD car formula HAS to be based around .

This is not to say you can't build a pretty healthy RB25T that still retains good road car characteristics . Neo head I reckon better basis than RB26 because of the chamber redesign and the two stage inlet cam phasing . On the other side of the coing the RB26 inlet system is a better performance design and better suits a GTRs air plumbing .

Production 25s always had single turbos and they have developed to the stage that singles can be pretty good nowdays .

Consider this clean sheet approach .

Neo Stag 4WD RB25DET .

Graft RB26 inlet manifold onto Neo head .

Bore to 1 OS to have similar capacity .

Standard exhaust manifold .

GT30 based turbo ie 0.82 AR IW 3076HTA .

Don't think 300-320 RWKW is an unreasonable expectation and non of this stuff has GTR/RB26 "tax" attached . Legally no capacity or rated power issue and Neo is emissions approved engine in Australia . You lose all the TT complexity and service bastardisation you have with the hot side of a factory RB26 .

I reckon this combination would give a stdish GTR in the same shell ie 32/33/34 a bloody quick hurry up and be better to drive in Camry mode .

A .

[log in]

Part numbers they have listed in Ebay are for tybe B cams. which are 260 degree 9.15 lift.

http://www.tomei-p.co.jp/_2003web-catalogue/e070_cam_RB26.html

I sent tomei an email last week about those cams to check out what was the go with them and they replied that they were legit and we're a small special order item to some dealers

[Wongy]

I sent tomei an email last week about those cams to check out what was the go with them and they replied that they were legit and we're a small special order item to some dealers

This is about the ex 270 9.15 lift right? Got told that they don't make them anymore, thats why they're not listed anymore.

Thanks log in.

[log in]

Looking to grab a set for my 26/30, they don't make the rb26 270x9.25 anymore and I think they had a 30mm base circle but not positive