Not sure if my rb25 is a det or de

[Sheldon]

Hi, I bought an r32 gtst almost a year back and ive been fixing all the little bits and pieces to get it to the stage of a road worthy. The guy i bought it off said its got an rb25det, The motor is N/A at the moment but im not sure if its de or det. The head is stamped 75T and so is the block. Any way of telling if it was originally turbo'd. New to the skylines and tryna learn. Thanks

sorry if this is in the wrong place.

 

[Duncan]

Well, what it originally left the factory with is stamped on the chassis plate on the firewall. R32 GTST came with rb20det not rb25det, although some late r32 gts came with rb25de no t.

But I guess you are asking if you have an rb25det motor with a turbo removed, or an rb25de. One way to tell should be a compression test as the rb25det will have lower compression, not sure other certain ways because it seems some rb25de blocks had plugged ports for the oil feed and oil return instead of nothing at all (although, no oil ports would confirm rb25de)

Quick search on here suggests 75T was the casting number for both rb25de and rb25det from R33 gtst, so that doesn't help.

[Dil-Dog]

Yeah i am trying to understand... So you wanna know if its a 

1. De+t

2. DET turned de 

3. A true Factory DE/Na

once you tell us exactly what you wanna know, we can tell you what to look for.

[Sheldon]

Sorry the engine was swapped to an rb25 by one of the previous owners and I’m trying to figure out if it’s a det Turned de or if it’s a factory de

[GTSBoy]

Take off sump. look for oil squirters.

Other, less thorough option is to see if the injectors are DE or DET. Or you could look at the ECU's part number.

[Sheldon]

How would I find out if injectors are DE or DET?

[KiwiRS4T]

By colour. Don't ask me which...Google and ye shall find.

Although on second thought they will probably be DE injectors regardless.

[Dil-Dog]

Okay i know exactly how u can tell... but is the engine in or out of the car?

[jmknights93]

Take some photos?

[Sheldon]

The engine is still in the car and I’ll take some photos but of what? The injectors or the engine 

[Rusty Nuts]

Get yourself an el cheapo borescope from ebay and take a look down the spark plug holes at the piston tops.

[Dil-Dog]

This is your best bet i can think of...That red circle is your turbo oil drain.  if in that area on your block is a blank/does not exists then it is 100% a de block. If this spot on your block has any kind plug of bolt or block off that goes into a hole, then its a turbo block that plugged up. 

[Rusty Nuts]

On 3/22/2020 at 1:38 PM, Dil-Dog said:

If this spot on your block has any kind plug of bolt or block off that goes into a hole, then its a turbo block that plugged up. 

Na sorry mate, have a de block here drilled and tapped for turbo oil return with a plug in it, so thats not necessarily true.

[Dil-Dog]

Damn bro..... i only have experience with neo’s. That must be a series 1/2 specific thing then. My 25de neo and my friends 25de neo is a blank in that location. good looking out though. @Rusty Nuts

[Rusty Nuts]

8 hours ago, Dil-Dog said:

That must be a series 1/2 specific thing then.

Yep, its a series 1 de block.

[Ben C34]

15 hours ago, Dil-Dog said:

Damn bro..... i only have experience with neo’s. That must be a series 1/2 specific thing then. My 25de neo and my friends 25de neo is a blank in that location. good looking out though. @Rusty Nuts

It is weird they bothered drilling and tapping then plugging it, but that's what they did.

What's even stranger is they did the same on rb30 blocks. Good on them for helping us out though !

[Dil-Dog]

Oh wow... thanks. never knew and thats good to know though. I guess nissan only hates us neo’s boyz ? 

[Rusty Nuts]

On 3/21/2020 at 2:55 PM, Sheldon said:

How would I find out if injectors are DE or DET?

DE injectors are brick red colour, DET are blue

[Rusty Nuts]

On 3/25/2020 at 3:14 PM, Ben C34 said:

It is weird they bothered drilling and tapping then plugging it, but that's what they did.

The blocks would have been all turbo spec on the production line, then some bean counter said "hey we can save some yen" and got a bonus.