Series 3 Rb25det?

[jarrod83]

Hey guys well i picked up my car today from another tuner in the battle to try and solve my afr problem and he explained to me that i had a series 3 rb25det engine similar to the neo?! based on the crank angle sensor the car has claimin it was from a r34 gt-t and saying they run different cam forks that fit into the sensor.. does that mean it would have variable cams on the exhaust side aswell?? he also said he had to run alot less timing on it due to it being a series 3 engine..

Can anyone shed some light on the subject... oh its a november 97 car aswell

Cheers Jarrod

[tridentt150v]

There are 'series 3' RB25's [it really only applies to RB26's], they are the last of the 25's and they are basically the same but with a few small differences, they are still called a series 2. They are not as distinctive as the RB26 3's. There are rumours about Neo cross overs, and bigger valves etc etc etc, but I haven't actually seen one like it yet. So I'd say they are just rumours, although the CAS and cam ends are definitely different. Don't think they are Neo though.

RB25's only have variable timing on the inlet side, exhaust side is fixed [live pulley centres notwithstanding].

I wouldn't think you'd have to run 'less' timing because its a '97 25.

Do a search, there is likely a FAQ around here telling you the differences from a series 2 proper.

[33drifter]

http://www.skylinesaustralia.com/forums/Di...25-t222494.html

read this thread. it makes referance to what you are talking about

[jarrod83]

sorry to bring this thread up again guys but i have read all the forums i can i was still after abit more information on the subject, this engine has got me stumped.. compared to the other rb25det engine maps i have seen it is alot different.. the timing map is very retarded the highest timing it has on the map is 35.. n on full bost it runs a timing of 10

and this engine still managed to make 285rwhp on 12 psi with stock turbo n stock engine

so if anyone knows any definate differences, i'd really appreciate it or if that amount of timing is normal

Cheers

Jarrod

[tridentt150v]

285rwhp/210rwkw is averageish on 12 psi

[nizmonut]

...suspect the engine maybe from stagea?

[tridentt150v]

Well spotted nizmonut, ML suffix............

[jarrod83]

nah.. m for m-spec.. n l is for active lsd.. arent stageas the same as r33 rb25dets with more restrictive exhausts and air intakes?

i suspect i wont get this question answered until i open her up..

what sort of timing do most r33s use on around 12psi of boost