Rb25 Tekkies Look Here.

[SLO-N-STEDY]

Hey guys,

I'm looking into buying a stagea, but can't decide on series1 or series2. Apart from the cosmetic changes (not important), the only major difference is the Tiptronic shift, and the S2 has the RB25 Neo engine.

Are there any benefits to the Neo engine??? Apart from factory outputs are rated a 206kw. but thats like all japanese cars so.

Can somebody give me any ideas???

[GoldZilla]

I think the Neo uses a little less fuel too. Best thing is to ask in one of the tech sections.

I know there's more, but I just can't think of it at this point in time...

[Tangles]

Neo has upgraded brakes, too

Neo engine is an update model, etc etc, and the turbocharger exhaust housing is slightly larger too.

When I got my series 1, prices for the series 2 were at a minimum 8grand more. I used that 8k for mods to my series 1 Dayz bodykit 1997 Stagea - definately the right choice for me at the time.

good luck with it

Brendan

[kralster]

They have VVT right through the rev range, gtr conrods, use less fuel, have about 60 nm more torque than the older rb25's. Which counts for jack if you mod it but makes it a much nicer car if stock.

My r34 is stock and that extra big dollop of torque down low really helps when just putting around.

[pixel8r]

I've got a s2, basically because I just wanted the best I could get at the time. The price difference was still quite considerable between s1 and s2.

If you're just after performance and value for money then the s1 is your best option. For the same price as a good s2 you could have a s1 plus enough mods to make it look, sound, and go better than a s2.

My reasons for choosing a series 2 were:

- Looks (actually I like both)

- extra ~20kw

- better fuel economy

- infinitely variable valve timing (i think the earlier rb25 is like on-off)

- direct injection (is this true?)

- newer, so likely less km's

- tiptronic auto

- bigger brakes

I think in the end its personal preference - and the reason I say that is because if you want value for money then get a series 1 - but if you really prefer the series 2 then there's your answer.

[qikstagea]

Wasnt there a difference in turbo internals? one had a steel wheel, the other ceramic, bearing differences maybe? think i heard that somewhere...

TIPTRONIC AUTO!!! Bigger brakes would be good too... what car are Stagea brakes off? they look like silvia brakes, to be honest...

[GoldZilla]

The turbo housings might be different, but both series 1 and 2 have ceramic turbines and plastic/nylon compressor wheels (like all s2 R33s and onwards).

[qikstag]

I am doing a Neo6 turbo converion on my RWD stagea. Basically the neo6 engine has a different exhaust cam and exhaust cam sensor. Plus being as it is a later model engine the neo6 has got direct injection (and i am pretty sure it has top mounted injectors not side mounted 1's, it could be the other way around). Although i thought they still had 370cc injectors.

[GoldZilla]

Wouldn't be direct injection, AFAIK... Might be a different fuel rail with the different injectors you mentioned, but that's different to direct injection.

Direct injection is what deisels use, where the fuel is fired directly into the cylinder, not into the manifold ports. Direct injection is only now becoming more common on petrol-powered cars...

[IMPORTD]

have to agree that the brake disks are too small... nearly scored my bros supra ones but alas, his buddy got in first

[Sydneykid]

Quick clarifications;

1. The RB25 Neo turbo has a slightly larger turbine cover, otherwise the same as RB25 (non Neo) S2. That means ceramic turbine and plastic compressor.

2. Neo has solid followers, RB25 has hydraulic

3. Neo passes 1996 emissions, RB25 passes 1993 emissions

4. Neo has SLIGHTLY stronger conrods

5. Neo has larger intercooler (still side mount, but thicker and taller)

6. Neo has plastic top feed injectors (not the same as RB26 top feed though), RB25 has side feed

7. Neo has infinitely variable inlet camshaft timing, RB25 has simple on/off. Neither have variable exhaust camshaft timing.

8. Neo has higher flowing cat standard, but most get changed for compliance, so it doesn’t matter

9. Neo ECU is “smarter”, so harder to trick with piggy blacks (SAFC, DFA or equivalent). Has a much more aggressive R&R mapping, so you need to be a bit more careful with tuning.

10. The NEO CAS has more outputs for increased timing signal accuracy to the ECU (lower emissions and higher power output).

11. The drive peg on the NEO CAS to camshaft interface is different, so you can’t use non NEO CAS or non Neo exhaust camshaft

12. NEO ECU has different ECU plugs and pin outs, so you can’t use an RB25 Power FC, you need the right model PFC.

That’s about all I can think of.

cheers

[SLO-N-STEDY]

Quick clarifications;

1. The RB25 Neo turbo has a slightly larger turbine cover, otherwise the same as RB25 (non Neo) S2. That means ceramic turbine and plastic compressor.

2. Neo has solid followers, RB25 has hydraulic

3. Neo passes 1996 emissions, RB25 passes 1993 emissions

4. Neo has SLIGHTLY stronger conrods

5. Neo has larger intercooler (still side mount, but thicker and taller)

6. Neo has plastic top feed injectors (not the same as RB26 top feed though), RB25 has side feed

7. Neo has infinitely variable inlet camshaft timing, RB25 has simple on/off. Neither have variable exhaust camshaft timing.

8. Neo has higher flowing cat standard, but most get changed for compliance, so it doesn’t matter

9. Neo ECU is “smarter”, so harder to trick with piggy blacks (SAFC, DFA or equivalent). Has a much more aggressive R&R mapping, so you need to be a bit more careful with tuning.

10. The NEO CAS has more outputs for increased timing signal accuracy to the ECU (lower emissions and higher power output).

11. The drive peg on the NEO CAS to camshaft interface is different, so you can’t use non NEO CAS or non Neo exhaust camshaft

12. NEO ECU has different ECU plugs and pin outs, so you can’t use an RB25 Power FC, you need the right model PFC.

That’s about all I can think of.

cheers

Fark thats all. lol. Cheers mate that is heaps helpfull. Much appreciated.

[mcnamg]

and the guru has spoken