Jump to content
SAU Community

Recommended Posts

Hello to all that read this,

Im just wondering what are the differences between the RB25DE and the RB25DET,

And dont say one has a turbo or puts out more power,

I want to know the nitty gritty, cams, pistons, crank, rods, head etc

I know compression ratio is high in the NA, but how is this achieved?

Link to comment
https://www.sau.com.au/forums/topic/214425-rb25de-vs-rb25det-r34-neos/
Share on other sites

Hello to all that read this,

Im just wondering what are the differences between the RB25DE and the RB25DET,

And dont say one has a turbo or puts out more power,

I want to know the nitty gritty, cams, pistons, crank, rods, head etc

I know compression ratio is high in the NA, but how is this achieved?

turbo is 9:1 CR, N/A is ~ 10.2:1 CR, achieved by different pistons.

Cams are the same, i think just on the turbo the exhaust cam gear is shifted a couple degree's.

Thats the internal difference, external theres the Injectors (370cc vs 270cc), ECU (to power injectors + different map & limiter), obviously different exhaust manifold, intake piping, things like clutch is different, different gbox.... thats about it...

The springs on the NA's are softer than the turbo ones.

And one has a turbo and puts out more power :rofl:

Remebering that 34's have a different head than the 33's and 2's because of the VVL

i know the r33 rb25de have softer springs than the det, but i've heard the neo engines are the same for both turbo and na

also if the pistons are the only thing different internally, i wonder if the na shares the same gtr rods as the neo det?

anyone pulled a na neo apart yet?

Edited by R34GTFOUR
  • 7 months later...

All R34 GT4s do not have the tiptronic functionality. From memory the gearboxes are still physically the same (RWD and AWD), just no tiptronic for the GT4 and RB20DE NEO. Tiptronic is only for the RB25DE and RB25DET

i know the r33 rb25de have softer springs than the det, but i've heard the neo engines are the same for both turbo and na

GT-V (which is N/A) has same suspension as GT-T, otherwise standard GT has the softer suspension (and also smaller rims, and probably other differences).

GT-V (which is N/A) has same suspension as GT-T, otherwise standard GT has the softer suspension (and also smaller rims, and probably other differences).

i was talking about valve springs, not suspension coil springs :)

Hi all,

I would like to confirm the different on the R34 GTT and R34 N/A i've check out my mate's car which is a TT on the dash it have HICAS, Slip, TCS display, when on my N/A 34 it dosen't do that mean i dont have these feature?

If anyone have the spec fact sheet for both these cars?

Cheers

:P

How can i get a LSD installed.

Ive seen a nismo one on NENGUN for 1.8k .. how would i install it.

MRXTCZ

You gotta drop it out of the car.

To do that you need drop drift shaft, prop shaft.

Open up the housing.

And change the gears.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • You are selling this? I have never bought something from marketplace...i dont know if i trust that enough. And the price is little bit "too" good...
    • https://www.facebook.com/share/19kSVAc4tc/?mibextid=wwXIfr
    • It would be well worth deciding where you want to go and what you care about. Reliability of everything in a 34 drops MASSIVELY above the 300kw mark. Keeping everything going great at beyond that value will cost ten times the $. Clutches become shit, gearboxes (and engines/bottom ends) become consumable, traction becomes crap. The good news is looking legalish/actually being legal is slighly under the 300kw mark. I would make the assumption you want to ditch the stock plenum too and want to go a front facing unit of some description due to the cross flow. Do the bends on a return flow hurt? Not really. A couple of bends do make a difference but not nearly as much in a forced induction situation. Add 1psi of boost to overcome it. Nobody has ever gone and done a track session monitoring IAT then done a different session on a different intercooler and monitored IAT to see the difference here. All of the benefits here are likely in the "My engine is a forged consumable that I drive once a year because it needs a rebuild every year which takes 9 months of the year to complete" territory. It would be well worth deciding where you want to go and what you care about with this car.
    • By "reverse flow", do you mean "return flow"? Being the IC having a return pipe back behind the bumper reo, or similar? If so... I am currently making ~250 rwkW on a Neo at ~17-18 psi. With a return flow. There's nothing to indicate that it is costing me a lot of power at this level, and I would be surprised if I could not push it harder. True, I have not measured pressure drop across it or IAT changes, but the car does not seem upset about it in any way. I won't be bothering to look into it unless it starts giving trouble or doesn't respond to boost increases when I next put it on the dyno. FWIW, it was tuned with the boost controller off, so achieving ~15-16 psi on the wastegate spring alone, and it is noticeably quicker with the boost controller on and yielding a couple of extra pounds. Hence why I think it is doing OK. So, no, I would not arbitrarily say that return flows are restrictive. Yes, they are certainly restrictive if you're aiming for higher power levels. But I also think that the happy place for a street car is <300 rwkW anyway, so I'm not going to be aiming for power levels that would require me to change the inlet pipework. My car looks very stock, even though everything is different. The turbo and inlet pipes all look stock and run in the stock locations, The airbox looks stock (apart from the inlet being opened up). The turbo looks stock, because it's in the stock location, is the stock housings and can't really be seen anyway. It makes enough power to be good to drive, but won't raise eyebrows if I ever f**k up enough for the cops to lift the bonnet.
    • There is a guy who said he can weld me piping without having to cut chassis, maybe I do that ? Or do I just go reverse flow but isn’t reverse flow very limited once again? 
×
×
  • Create New...