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Neo De+T Build

Pure_Sincerity
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Pure_Sincerity Enthusiast

Pure_Sincerity

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So I've gathered items for a rb25de +T build.

Before I get the whole "why not just do a straight conversion ?" I'll just tell you now you can't do it this cheap!!

So far I've acquired a full rb25de neo with 165-170 psi across all 6 and only 120xxx kms on it for $100.

A full rb25det neo intake manifold with injectors and rail etc for $200.

Already got braided turbo lines and a neo factory turbo manifold also.

Will be running a factory op6 turbo and cosmetic 1.3mm head gasket. Oil cooler and relocation kit. Premium pulp and either 25det ecu, IMPUL, nistune or megasquirt and FMIC

Since I don't want to re loom, I've decided to eliminate cold start which I'm not fussed as I've never owned a car where cold start even worked before I got my current r34 lol. So I'm going to buy and bolt up an aftermarket 76-80mm throttle body on the standard intake and re wire the DET TPS to the DE loom. Shouldn't be difficult as both have 6 wires. I'll just need a Pinout diagrams.

Also will need to rewire the IAC valve or delete it though nistune is an optional thought. And re routing water lines may be a bitch.

As for the head, the na neo has smaller intake ports then DET, so decided to get them tapered out and polished to DET neo size to run the gasket and manifold smoothly. Also at the same time, I'm getting the exhaust valve ports die grinded to remove castings to run the bigger DET neo cam or buy tomei drop ins as shimming is the same between both engines.

Anyone done this before that can shed some insight ? Thoughts ? Criticism ?

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GTSBoy Grand Master

GTSBoy

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  On 17/03/2014 at 8:44 AM, Pure_Sincerity said:

As for the head, the na neo has smaller intake ports then DET, so decided to get them tapered out and polished to DET neo size to run the gasket and manifold smoothly. Also at the same time, I'm getting the exhaust valve ports die grinded to remove castings to run the bigger DET neo cam or buy tomei drop ins as shimming is the same between both engines.

And......there goes the difference in the money.

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Sarumatix Veteran

Sarumatix

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If you already had the head off, might as well just get a neo det head instead. You do want to swap out the exhaust side cam as that thing is rubbish (also fixed by getting det head). I very much doubt you want to touch a stock ECU with that setup,I would suggest considering (if within budget) something more programmable (haltech etc). last I checked running RB25 with nistune was not straight forward (most used z32?).

Otherwise i'm interested to see the cost benefit of grinding the DE head, make sure you write every cost down and see what you come out with. keep on with this project!

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scotty nm35 Grand Master

scotty nm35

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Should have left the head stock for improved gas speed imo. Aftermarket 80mm throttle? lol.

Anyway, isn't this in the big boys section? The NA+T's are usually relegated to the NA section... Like the 10,000 other threads just like this.

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Pure_Sincerity Enthusiast

Pure_Sincerity

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Yes, neo ecus can be nistuned straight up and will do everything I need it to do.

Also, the idea of the 80mm throttle was not for the size as I'll only be running 76mm piping but just to remove the cold start and butterfly etc that's associated with it.

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GTSBoy Grand Master

GTSBoy

Posted
Posted
  On 18/03/2014 at 2:12 AM, Pure_Sincerity said:

Also, the idea of the 80mm throttle was not for the size as I'll only be running 76mm piping but just to remove the cold start and butterfly etc that's associated with it.

What are you talking about? There is no "cold start and butterfly associated with it". The cold start stuff is on the back of the plenum. The butterfly on the Neo DET TB is the traction control. If you want to not use it, fair enough, but at least know what it is that you are doing.

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