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The Ultimate Rb25det

trent26

By trent26,
in Engines & Forced Induction

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FineLine Grand Master

FineLine

Posted
Posted
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.

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FineLine Grand Master

FineLine

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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.

BTM Community Regular

BTM

Posted
Posted
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 Grand Master

FineLine

Posted
Posted
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 Community Regular

BTM

Posted
Posted
>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 Grand Master

FineLine

Posted
Posted
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.

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