Sereis 1 Stagea Engine Variants

[kidafa]

As thread title suggests im wondering on the different engines in the s1 stags.... Mines a a '97 RS4 V (well call this car A) A mates (stagharts) has a '98 RS4V Dayz (car B) Both are series ones. Im aware that his is a later model than mine and would have been produced just before the s2's were starting to get pumped out...

Now today after doing some work on his car I've noticed a few things, His CAS is different to mine and he has a nipple on his plenum that I dont have. Is their such thing as a Series 1 RB25DET and a Series 2 RB25DET? If so what are the differences?

When i upped the boost on mine to 12psi with no computer or piggbacks it didnt rich and retard or miss at all. However stagharts car doesnt want to get much over 10psi and feels to be missing or R & Ring at full throttle and full boost. His coils are in OK condition with some evidence of them leaking spark. Will try my splitfires in their soon to see if it removes the jolting/miss feeling on WOT.

Picks of each part im talking about can be found here : http://www.skylinesaustralia.com/forums/Se...Va-t281219.html

[paulr33]

its likely to follow the same suit as R33 GTST engine models, there are 3 known variants

series 1 = RB25det came in 1993 to 1995 GTST

series 2 = rb25det came in 1997 ish onwards

series 2.1 or series 3 or something else = came in 1998 R33 GTST

series 2.1 or series 3 or something else is RB25DET with ER34 CAS and some slight ER34 parts, but still R33 RB25DET

series 1 will have green or blue label AFM

series 2 will have pink label AFM

[paulr33]

yep as per your pics

car a is series 1 rb25det

car b is series 2.1 or series 3 rb25det

theres 2 tenths of bugger all difference between them

the ECU differences are negligable and not even worth worrying about

the fact your doesnt hit R&R its pure luck, it might be a mangled/remapped/hacked ECU (likely)

[kidafa]

any difference in the management of the engine? Do the series 2.1/3 R & R when boost is upped to 12psi with no piggyback and stock ecu?

so s1 and s2 only diff is afm?

[kidafa]

the ECU differences are negligable and not even worth worrying about

the fact your doesnt hit R&R its pure luck, it might be a mangled/remapped/hacked ECU (likely)

So you think my car (car a) that doesnt hit the r & r has a hacked ecu?

[paulr33]

theres a listed differences thread somewhere

the ECU differeces are bugger all, not even worth finding out what they are

the stock ecu is junk, dont even bother trying, remap, standalone or piggyback it

all stock ecu's r&R when airflow exceed's set levels

its not a fixed setting on boost, its based on airflow

it usually happens when you run around 10-12psi however

[paulr33]

yeah its likely remapped or hacked to have the R&R removed

[kidafa]

thats interesting... Mine never r & r as hard if any when i upped my bost.... And it was a stocker when i got it.....? Would supprise me if the ecu has been hacked to remove the r & r. Im now running a SITC and SAFCII anyway Just trying to sort out why his is r & r ing more... Might throw the timing light on his car and check the base timing for shits....

[paulr33]

whats the point?

we all know the stock ECU has R&R - you are trying to prove nothing?

get a piggyback, remap it, stand alone or change the ECU

[Duncan]

noooo paul....not for stageas. there are at least 3 ECUs in w34 series 1 stagea and they are very different in mapping / sensitivity to extra boost. And they all have different wiring looms. All use the S2 R33 GTST style motor with ignitors on the coil packs. Series 2 W34 is different again and may be the same as r34 gtt (not 100% sure though)

have a look for my thread re this in the stagea section.