UrS4 2.2T Avant project

[prj]

Just put some good 5w40 in it...

[Billman]

isnt 5W/40 too thin for our engines? Or does it have to do with the cold temps up north?

[prj]

Well, we get -20C in winter.
And no, not too thin at all. Could use 5w50 if driving it very hard...
But really, I have mapped so many of these now, and I have not seen issues during mapping on good quality 5W40 oil. And that's when you do many pulls in a row.

Usually when oil temps go high, it is because of persistent knock...
Perhaps in hot weather on the track your oil will get hotter, if so, I guess 5w50 could be used.

Oil pressure alone means very little anyway. If the oil is really thick, the pressure can be high, but that does not mean it is getting everywhere and lubricating everything.

[Thuppu]

Yes, I have used 5w-40 now after the rebuild. Just normal Valvoline fully synthetic, no racing oil. Tomorrow I buy new oil and filter and check all easy things. Hope the noice is gone after the change. Luckily I'm just working in the night shift, can't sleep on something like this.

[Billman]

you could then answer the rest of my questions :-)

[Thuppu]

here some questions:

what turbine housing do you use? I did not read the thread through, is it 2.2 or 2.5? What cams? How is your boost profile now before mapping?

It's a divided #16 Holset T3 housing and the engine is a 2.2. 7A exhaust cam and AAN exhaus cam used as intake cam. Full boost at 4500rpm, starts building boost from ~2500rpm.

[Billman]

Do you just dropped the AAN in and to the marks?

Do you have any data regarding boost in 4rth gear at 2500-3000-3500-4000?

[Thuppu]

No, hade to made the timing by hand with a measure clock(or what is it called?). No I don't have exact measured data of the boost profile.

[quattro84]

Good luck on this one Thuppu, this forum needs the Super40 results quite badly...

And i must say i totally agree with PRJ. Oil pressure means **** without having a decent flow around the engine...

[Thuppu]

Small update... No noise with cold engine. I report later what the deal is with new oils and hot engine

[Billman]

i also had a noise on my old engine coming from the front of the engine and it came out it was the AC belt (when I sprayed some WD40 on it it instantly go away). It was very unusual and not the typical belt noise.

[pasbogdan]

Well, we get -20C in winter.
And no, not too thin at all. Could use 5w50 if driving it very hard...
But really, I have mapped so many of these now, and I have not seen issues during mapping on good quality 5W40 oil. And that's when you do many pulls in a row.

Usually when oil temps go high, it is because of persistent knock...
Perhaps in hot weather on the track your oil will get hotter, if so, I guess 5w50 could be used.

Oil pressure alone means very little anyway. If the oil is really thick, the pressure can be high, but that does not mean it is getting everywhere and lubricating everything.

YAP.
2 bar on iddle and almost 4 barafter 2000 rpm(there was loud big end sound) and found all 5 big ends gone.So most of the oil pres means nothing.
I saw an engine with less than 1 bar at iddle and no more than 2 bar at high rews that was making no ping.

[A80Avant]

and you think that making no more than 2bar on high revs is acceptable??

[Bram]

I used to run A brand 5W40 oil all-year-round. 10W60 is too thick if you ask me.

[pasbogdan]

and you think that making no more than 2bar on high revs is acceptable??

We were not talking about acceptable,good or best
The point was that an engine needs also flow not only pressure.
4 bar after 2000 rpm with bigend blowed and engine masiv pinging(i do not if that is the right english word to describe the sound for bearing failure) confirms the rule for me.
And i forgot:the blown engine had 10w60 in it so it had pressure.
And for the only 2 bar at rews i think the oilpump relief valve spring was gone but that was not my engine,not my client,no nothing.