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R32 GTS25 RB25de+t using an unchipped RB20det ecu?

zerepdivad

By zerepdivad,
in Engines & Forced Induction

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zerepdivad Apprentice

zerepdivad

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I've got a R32 that came stock with the non VCT RB25DE.  I'm looking to do a mild +t setup with mostly factory components.  I've read some old threads where they mention running the RB20DE+T setups with the stock turbo ECU.  I'm wondering if I will be safe to do the same.  My power goals are pretty mild since I'll be using just a stock RB20 turbo at first and I have an 45v4 RB25det turbo that I will upgrade to if it doesn't blow up on me.  From what I have read, it seems that the RB25DE and RB20DET use the same injectors and MAFS so I'm hoping to see if anyone can confirm that this will work for me.

 

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zerepdivad Apprentice

zerepdivad

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It doesn't seem like it would be too terrible of an idea. It seems that I've read that some people do the r32 rb20de+t with a GTST ecu with no chip and it runs fine as long as mafs and injectors are the same. And with the r32 rb25de being so similar to the rb20 I figured it would at least run fine on low boost. I'll have a wideband to monitor AFR's.

 

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DETP Newbie

DETP

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If Disaster occurs, it will be due to detonation. Start with setting the timing a good few degrees retarded and you will need to listen for detonation, you can build a little knock listening device cheaply and easily, a wideband would be very useful to monitor the afr as well.

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zerepdivad Apprentice

zerepdivad

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Yeah, that is basically what I had planned. All stock components, only like 7 psi and retarded timing a few degrees.

I have known a lot of people who have done s13 ka24 turbo conversions with just retarded timing and an FMU with low boost and have run them a long time. That's basically what I am going for. I understand that a chipped ecu or standalone is the best option but I'm really just looking to wake the car up a bit.

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GTSBoy Grand Master

GTSBoy

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Why spend the money required to add the boost without spending the little extra money to make sure that you don't accidentally grenade it? Seems like a return to the stupid days of the late 80s early 90s where we didn't have the options that we do today.

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DETP Newbie

DETP

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GTSBoy makes a sound argument, however having been is similar situations myself where I couldn't afford or justify purchasing a aftermarket ecu, there is always a way. Projects like this provide an opportunity to learn alot. Here in NZ we have trademe and over the years I have bought a few older standalone ecus for around $100. Your proposed setup would be far from perfect, but it could work. Detonation is your enemy here!, run good fuel and build a listening device.

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trel Mentor

trel

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Just dont do it. I'm with GTSBoy not tearing you down mate, but you'd be better off getting a 25det and all ancillaries that come with that motor including ecu and be done with it. Keep the 32 ecu for nistune and boogie ?

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zerepdivad Apprentice

zerepdivad

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Sounds like nistune is the way I'll be going. I'd be lying if I said that I don't plan on at least trying the GTST ecu and see what happens on a drive down the block.  I'll be on the lookout for a nistune chipped ecu second hand. The problem is that nobody near me tuned it so I'll have to figure that part out.

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trel Mentor

trel

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Look up a guy called Toshi Tune on FB or here. I don't think he's been on this forum for a while but he does remote tunes while you drive. He is good with Nistune. Sounds crazy but might be a good option for you if you don't have anyone there to do it. He is very very good "Japanese style tuning" is his motto.

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robbo_rb180 Grand Master

robbo_rb180

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Poor man pays twice.....
Do it once and do it right. Helped with a few NA+T conversions on a few cars and with what is available these days it is easy & relatively affordable to do.  The performance gain is nothing just adding the turbo without all the supporting fuel & ignition stuff. 

This is the only way I would do a NA+T Nissan these days

Nistune
https://www.trademe.co.nz/motors/car-parts-accessories/nissan/ecus/listing-2598731886.htm?rsqid=544f00f97d7445d8a2bb6cc625d524a1-001

AFM
https://www.trademe.co.nz/motors/car-parts-accessories/nissan/electrics/listing-2582866171.htm?rsqid=bd2234b74bfa46ddafc477cd90d356e0-003

Add a fuel pump like an Aeromotive stealth 300, factory turbo fuel reg, standard turbo or gtr injectors and enjoy a car that is reliable and fun with the option to go further in the furture. 

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zerepdivad Apprentice

zerepdivad

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I will be on the lookout for a nistune ecu. The software and cable seem to bump the price up quite a bit.

I'm in the US so I'm not sure about buying from trademe as far as shipping. 

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zerepdivad Apprentice

zerepdivad

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1 hour ago, KiwiRS4T said:

Hey this is 2020 - we have aeroplanes!  And I know for sure that postage from NZ to the US is a fraction of the shipping charges that ebay sellers seem to want!

That's mainly what I was basing the shipping being expensive from. eBay sellers shipping from Australia are often crazy overpriced for shipping.

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