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.

Car A:

Car B:

[paulr33]

car b has series 2.1 or series 3 RB25DET which is RB25DET with some neo parts, ie ER34 CAS is visible

[gotRICE?]

I always wondered why my R33 RB25DEt had that little black nipple on the manifold. Seems like none of my mates ones do.

[KiwiRS4T]

Also check ecu. Most common ecu for S1 is OV300 with less common 301 or 310 but I have heard suggestions that some S1 non neo have had the S2 type computer.

BTW n/a cars (rare in Aus I know) got the neo engine in the later S1 cars ... I used to have a 1997 n/a neo engined S1.

[stageaharts]

Checked the ECU and build date out of interest (My car is "Car B"), ECU is a OV310 model, build date 02/98... It seems that there are implications in having the rarer OV310 when thinking about an aftermarket ecu, Duncan had to get a custom loom made up to fit a PFC to his late model S1 Stag.

Edited September 6, 2009 by stageaharts

[KiwiRS4T]

Yep I got a chipped R32 ecu piggybacked on to my OV300 - what a mission! Easier would be the GReddy E-manage or a wire-in version of the Vipec (Link G4 extreme).

[25stagea]

Ive got a 97 S1 rs4 but i have same motor as car B , i don't know about the ecu.

So dose this make my engine a neo or dose it just use some of the parts , if so What?

[kidafa]

No mate its not a neo engine. The neos were not around in '97 and have a little engine cover