I am considering a 2016 CTTS and am looking for technical differences between this 2016 4.8 and its predecessor. Please don't cite the HP and TQ numbers.,,,

I really want the deep-dive tech materal if possible. I am struggling to find a full description of the revised charge-air cooling system, turbo chargers and intercoolers. I know the turbos are upgraded and the intercoolers are larger, but that is the limit to what I can find. For instance, what are the two additional tubes that connect to the front of the intake plenum? Are these part of the revised charge-air system?

If there is a Porsche Tech bulletin or 2016 4.8L CTTS technical dealer service bulletin, I would appeciate a link.

TIA.

Cheers,
Tom

 

Are you asking about the difference between 958 4.8TT and the 957 4.5TT? Or between 958.2 4.8TT and 958.1 4.8TT?

You probably saw this. Not too detailed: https://newsroom.porsche.com/en/comp...ory-12690.html

https://newsroom.porsche.com/dam/jcr...0Turbo%20S.pdf

https://en.wikipedia.org/wiki/Porsche_V8_engine

https://en.wikipedia.org/wiki/List_of_Porsche_engines

 

Thank you. I have seen all those but appreciate the help!

I think I have enough info to put together a short writeup on the improvements/ changes to the Turbo S engines through the generations. there is plenty on the 995 and 957 generations, but very little on the 958.1 and 958.2 and beyond.

Cheers,
Tom

 

For clarity's sake, the original question relates to 958.1 vs 958.2 Turbo S engines, is this correct?

 

This is correct.

I know that the larger, lighter turbos were integrated into the exhaust manifolds in 2014 as well as the addition of a higher HP fuel pump pressure and special pistons. From what I can tell, the intercoolers were basically all the same size from 2012-2016. Another interesting tidbit is that I believe they went to a dry sump in 2014 to handle the g-forces that the Panamera variant produced at the track.

Still looking for more info.

 

None of them are dry sumped

 

Not to get in another debate on whether it is a true "dry sump..." I certainly get the whole tech vs. marketing debate. I'm going on Porsche's own technical data. See "lubrication"

https://pnr-prd2-pub1.newsroom.porsc...l_Data.pdf.PDF

 

Yeah. They are full of ****. The m96 in my boxster has an integrated dry sump and it loses oil pressure if you look at a turn.

Marketing bull****

 

It is interesting though that I read that a 2014 Panamera Turbo S with the same upgraded engine pulled 1.09 Gs on the skidpad and hasn't suffered any loss of oil pressure. There are also the Panamera and Cayenne N-Ring record articles where they reference the oiling system on this engine.

 

From my knowledge and previous research on the topic, the 958.2 CTTS has an identical motor to the regular CTT, with only tune being the major difference.

I am pretty sure that’s also the case with the 958.1 CTTS vs regular CTT as well. The 955/957 CTTS had more of a difference IIRC.

That all said I’d be interested to hear information stating something otherwise. Buy the 958.2 CTTS it’s a great SUV!

EDIT: I now see you’re asking about 958.1 CTTS vs 958.2 CTTS motors…not sure on the differences but it would probably be the same question regarding 958.1 CTT vs 958.2 CTT sans the tune as I indicated above.