No tranny cooler. Contact Steve Weiner about this topic, he was one of the people who built my car and recommended leaving the engine and tranny trays off.

 

Interesting, the plot thickens!!

Jack

 

The 996RSR of Konrad-Lechner and Alzen had underbody CF panels during last week end's 24hours in Dubai. They were second and third behind the Red Bull Z3GTR. I guess the aerodynamic benefits and lift avoidance do have more benefit than fresh air.

 

Yeah, but don't those cars get rebuilt after the race?

 

I have decided to let the 993 engine under panel posts go, those can be answered in the archives section but this one was so far off that I felt compelled to rely. You are comparing apples to oranges here. The 996 GT3 RSR has an antifreeze/water cooled engine and gearbox and relies primarily on it's 3 radiators in the front bumper for cooling. The 993 has an air/oil cooled motor and relies on two main sources for it's cooling. The first being the air over the engine case, cylinder heads and cylinder fins (the engine) via a large fan on the rear of the engine. The second being the oil cooler in the right front fender which is cooled mainly by an electric fan. The RSR's rear down force is not only gained by it's large rear wing but also the rear underbody panel you speak of called a rear diffuser.

 

I used to take my tranny cover off for track and keep it on for street but now I just leave it off.

 

I thought the 993 non turbos were watercooled, my bad. It makes sense now, the watercooled engines need the undertray to reduce drag but the aircooled ones don't, since there is only one radiator in the front, so less drag? Humm. makes sense now.

So the undertray and diffuser are good for watercooled cars but not aircooled cars, I will post that on the 996 forum. I love this place. Thanks

 

Ah, yes, so Porsche designed, fitted and spent money on an item to make sure we'd overheated the engine and bought spares ?

I was under the distinct impression they went out of their way to improve the ground effect of the 993.

But, honestly, what do I know

Peter R.

 

OK that being said, then no politics, government laws or environmental issues ever affect automobile manufacturing and design?

 

Government certainly do! Porsche engineers were visionaries, they anticipated fuel prices would skyrocket, so they added the tray. In hot countries like where I live, fuel is very cheap, so you can remove the tray, 1st, you don't damage your valve guides, second, your fuel consumption as a result of worse aerodynamics does not really matter, fuel is cheap here. Also , hot air is less dense, so aerodynamics are less affected.

 

Erm, if it was fitted just to satisfy the swiss noise *****, then why did they fit it to all cars, in all markets, that just doesnt make commercial sense.

If you look at a full options list decoder then you'l see that they make cars differently for different markets.

I just can't see them saying "you know, we have to fit these engine undertrays for the Swiss market, oh we might as well make fit them for all markets, it will save checking each car before we ship it, lets ignore how much extra it costs"

I'm not looking to join the for/against argument and i 'm sorry if this question has been raised before, but it just doesnt make sense.

 

Tony, give it up. I have asked the same question several times in the past, and those who want to believe that the Porsche Engineers were/are Gods, working completely independently of any outside influences (government regs or corporate edicts, etc.), will simply choose to ignore this because it doesn't fit their "reality".

 

Just when you think a thread is dead...someone digs it back up.

I am making some more popcorn...

 

It's alive?

 

Sorry I did not mean to open old wounds Can't let an undertray thread die can we!

All in good fun Tony