The Ultimate Rb25det

[FineLine]

That GTST is a 2.8 not a 2.5

REgardless of what it is its living proof that a gtr is actually a handicap if you are going for all out 1/4 mile times.

There is simply no need to hump the extra weight around when a properly set up rear wheel drive can give you the whole 9 yards.

As for the ultimate 25...Ultimate for what ?I think I went damn close to building the ultimate allrounder, Just do a solid lifter conversion then build it the same as any rb.

We ended up with 400rwkw on pump with a 35r and full boost by 3800 rpm.

It was an amazing engine and just never stopped pulling all the way to the redline (8500)

I only did one 1/4 mile pass with it for a net of 11.3@125 mph. I have no doubt it had 10's with very little work.

I do like the current 30 i am running but i miss that 25.

[NYTSKY]

Noel,

What size dump pipe did you have? 3.5inch?

[FineLine]

Noel,

What size dump pipe did you have? 3.5inch?

3.5 from the turbo to the tip, gutless cat etc dave.

[NYTSKY]

Thats what ill be getting made next i think.

3800rpm is impressive for a 35R.

[FineLine]

Thats what ill be getting made next i think.

3800rpm is impressive for a 35R.

Its all in the head mate. The head was a work of art but sadly it went to god when we dropped a valve spring.

In the process of building another solid converted head for the 30 right now actually.

[NYTSKY]

lol me too

[FineLine]

lol me too

SWEEEEET. What solid conversion are you using ?

[NYTSKY]

NEO 34 head.

[FineLine]

NEO 34 head.

LOL. cheatin bastard.

[NYTSKY]

Yourself? Cost of the conversion?

[FineLine]

Yourself? Cost of the conversion?

Using the supertec kit from fabre. o/s valves, solid lifters, dual valve springs, titanium retainers etc. 2500 bucks for the full kit.

[discopotato03]

R32 RB25DE block with RB26 head and internals inc piston oil squirters , basically RWD RB26 with RB25 number on the block .

When you say ultimate , ultimate for what purpose .

A .

[BTM]

REgardless of what it is its living proof that a gtr is actually a handicap if you are going for all out 1/4 mile times.

There is simply no need to hump the extra weight around when a properly set up rear wheel drive can give you the whole 9 yards.

As for the ultimate 25...Ultimate for what ?I think I went damn close to building the ultimate allrounder, Just do a solid lifter conversion then build it the same as any rb.

We ended up with 400rwkw on pump with a 35r and full boost by 3800 rpm.

It was an amazing engine and just never stopped pulling all the way to the redline (8500)

I only did one 1/4 mile pass with it for a net of 11.3@125 mph. I have no doubt it had 10's with very little work.

I do like the current 30 i am running but i miss that 25.

What cams and exhaust housing on the turbo were you using?

I'm trying to plan out the build on my RB25DET NEO in my 34, with 300-320rwkW being the initial plan with more desired come rebuild time (more revs).

[FineLine]

What cams and exhaust housing on the turbo were you using?

I'm trying to plan out the build on my RB25DET NEO in my 34, with 300-320rwkW being the initial plan with more desired come rebuild time (more revs).

>82 rear housing. tomei cams. 10.25 lift. 260 degree inlet duration, 270 degree exhaust.

Your power figure is very doable. If you want to start going beyond that then you must get the planets to align.

Port match everything from the throttle body to the dump pipe, Fat ignition system etc etc.

[BTM]

>82 rear housing. tomei cams. 10.25 lift. 260 degree inlet duration, 270 degree exhaust.

Your power figure is very doable. If you want to start going beyond that then you must get the planets to align.

Port match everything from the throttle body to the dump pipe, Fat ignition system etc etc.

Yeah I'm leaning on 3076R with .6 housing, merge collector manifold, 260 Tomei cams in/ex, NissTune, 18 psi and all the supporting fuel and intake/exhaust mods.

My mates car just pulled 330rwkW on 18psi with basically that set up on a Neo so it definitely works.

If I could get a 35/40 on song by 3800rpm, I'd just throw one of them on the car straight away, but without serious head work I don't think it'd have a chance of flowing like that.

You got a build thread FineLine? Would be greatly interested to have a read of it and look at your development path.

[FineLine]

Yeah I'm leaning on 3076R with .6 housing, merge collector manifold, 260 Tomei cams in/ex, NissTune, 18 psi and all the supporting fuel and intake/exhaust mods.

My mates car just pulled 330rwkW on 18psi with basically that set up on a Neo so it definitely works.

If I could get a 35/40 on song by 3800rpm, I'd just throw one of them on the car straight away, but without serious head work I don't think it'd have a chance of flowing like that.

You got a build thread FineLine? Would be greatly interested to have a read of it and look at your development path.

I dont have a build thread as such mate. it just evolved over a fairly long period of trial and error.

The real key IMO is the head. RB heads have an inherent flow mismatch between between the inlet and the exhaust. The inlet flows almost twice the exhaust side and anything you can do to even it up helps immensely.

Porting by a competent porter, valve size, cam selection all play a part. Get it right and the rb will ooze power.

[rad100]

so if you work the bottom end and leave the head with just cams and cam gears will it be fine?

what are peoples opinions on n1 oil pumps for built engines?

[TiTAN]

if you like using an ignition cut limiter and smashing the thing off it. dont bother. if its a street car that sees the odd fang sure its a good cheaper alternative to the nitto/jap pumps which cost 3x as much.

[rad100]

yeh ill be seeing track more than street.. so ill be changing to a nitto pump and ross balancer!

[2rismo]

I like my 25. Not carried away and tuneable just the way I like it. Stock RB25's making ferocious power all end in pieces. It's poor advice when we're talking about the "ultimate rb25".