Jump to content
SAU Community

What Is The Difference...?

POWR34

By POWR34,
in Engines & Forced Induction

 Share

Recommended Posts

Simon-S14 Grand Master

Simon-S14

Posted
Posted

a lot of missinformation in that thread.

the compression ratio is the same between the neo and older rb25's.

turbo is different. head has solid lifters and different cams. intake manifold is a better design.

rods are suppose to be GTR rods.. but ive never yet had that confirmed. pistons are the same as is the block.

lachlanw Veteran

lachlanw

Posted
Posted

one has 206 kw . one has 184 . nuff said .

what exactly do you want to know ?

lots of random stuff

neo head has bigger exhaust valves than gtr, combustion chamber is a lot smaller , top feed injectors , new cas . no coil bracket . coils bolt straight to head . takes gay lil oil filter . has bigger exhaust housing on turbo .

bubba Grand Master

bubba

Posted
Posted
RB25DET NEO runs hot burn technology, basically the gases burn at a higher temp which causes less emissions-not sure how that works but it does-closer to EU standards

Which is why the Neos seem to have an 80-82deg thermostat as opposed to the earlier 76.5deg ones.

GTScotT Grand Master

GTScotT

Posted
Posted
one has 206 kw . one has 184 . nuff said .

You do realize that the above information is irrelevant dont you? That 22kw would be like pissing in the wind for the R33 motor to make with the most minor of changes to the ecu.

As per OP, major differences with the neo is the head and intake. The neo head has a smaller dome in the and will not work with such things as RB26 pistons etc. The intake manifold is said to be more efficient and uses top feed injectors which are cheaper to outsource.

End result of similarly modified motors is relatively similar :cool:

aleks Community Regular

aleks

Posted
Posted
a lot of missinformation in that thread.

the compression ratio is the same between the neo and older rb25's.

turbo is different. head has solid lifters and different cams. intake manifold is a better design.

rods are suppose to be GTR rods.. but ive never yet had that confirmed. pistons are the same as is the block.

Pistons are definately N1 so they are not the same. Oil pump is a N1 with a small crank collar.... can't remember rods.

wasnt me Collaborator

wasnt me

Posted
Posted

bit off topic. but i didnt realise the r33 and r34 gear boxes were a bit different. i got this from a nissan review of thr r34

quote.

Shot peening is applied to the first, second, third and fifth gears of the manual transmission for improved strength and durability to accommodate the higher engine torque. A double cone synchronizer is also provided in the first gear position, in addition to those previously used in the second and third gear positions, for smoother, easier shifting. Moreover, a pull-type clutch for easier operation has been adopted in the manual transmission on turbocharged models.

aleks Community Regular

aleks

Posted
Posted (edited)

I don't know the full history of my engine, it has about 120 000kms on it. It had a genuine head gasket, bearings and timming belt in it So it doesn't look like the engine has been pulled apart.

I realise the difference between the pistons, my pistons have the thinker top ringland. (should of said N1 type pistons)

Also is "n" with a single dot above it are the markings for N1?Because my oil pump also has this marking.

I could be wrong.... would be keen to hear from someone who has actually pulled a Neo apart.

I'll be able to throw up a few pictures on here in a week.....

Edited by aleks

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Ok thanks..that was my second question if i can somehow bypass this even with Nistune(that is all i have right now...aparat from stock ECU. So with some aftemarket it can by "bypassed" or make it work?  I know there is Link or Haltech (mainly used). We have ECUmaster here so i will gather some info about it.
    • GTSBoy
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      Yes. You will need to get the original boost sensor and wire it in. That is.... if you plan to use a stock ECU - even a Nistuned ECU. The Nissan ECU will not operate correctly without it connected. And yes, it will do annoying stuff like you are experiencing. You will almost certainly be better off with some aftermarket ECU, than trying to hunt down rare sensors.
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Ok so ABS/TCS is "not" the problem. Yeah i know now about the ABS with Nistune(i told that to the Nistune guy) but iam not 100% why or why i dont have ABS. ABS cube is in the engine (always has been) but i had braked couple of times rly hard and brakes just locked and scream. Does all Skylines have ABS cube? That boost sensor https://www.sau.com.au/forums/topic/367633-wtb-r34-gtt-turbo-pressure-sensor-pics-inside/ Is this it? I need to ask but i have a picture of engine bay and i do not see that (100% is not in that place) If i do not have this the car can do what mine is?(cutting around 4000 rpm) Here is the pic of my engine bay(only one i have) BUT i think i dont have that cuz loom was used from my RB20DE NEO and i know (obviously) that it does not have boost control or any wire to that...) so maybe that is the problem? (i dont know for 100% if that car where the engine is from had that)...but i dont have the loom from that
    • MBS206
      S1 rb25/s14 starting problem

      By MBS206 · Posted

      I'm with you here. It's either loom has an issue, OR, injectors are not functioning properly. It could even be they're just constantly dribbling, hence the wet, but not firing.
    • Duncan
      S1 rb25/s14 starting problem

      By Duncan · Posted

      Depending on how long the car sat it is very possible for injectors to be stuck open or closed, I'd get them cleaned and flow tested. Other than that, obviously when the loom changes and the car doesn't start any more....the loom is suspect so some tracing / comparing may be required
×
×
  • Create New...