[WEC] Porsche Prototype Discussion

[deltawing]

Originally Posted by Spyderman

It could be my eyesight or just that I have forgotten to take my meds, but that nose looks lower to me. Thoughts?

Good eye!

[templer]

I would say same massive bodywork changes.
What can see are that the rear big honking holes are enlarged ( also a bit of the top side of the rear fender is cut out), the connecting point of the bodywork to the diffusor behind the rear wheels is changed, the sidepod shape is massively changed with a much more scalloped shape and and larger barge-board inside, the front fender has two holes at the rear of the top side, the splitter shape seems to be changed, the bodywork between the nose is pointing more foward and is so lower, the front brake ducts have moved inside the front fender, the radius of the front fenders seems to be sharper at the leading edge with the headlights positioned more outboard and also the roof scoop has a different shape

[gwyllion]

Yes, there are a lot of aero updates.

Sebring version:

Monza version:


The hole at the backside of the front fender, like new R18 and Perrinn LMP1, is new.

Sebring version:

Monza version:


Most notably, the air intake for the front brake cooling moved: it is now almost underneath the headlight. Now the nose looks even more like the Audi's.

[Spyderman]

too late.

[Spyderman]

Looks as if Jose Gallego Segura has been hard at work.

[TF110]

Thats a huge gap for the air to flow through out the bargeboards from the front wing. Much larger than before. I knew the 'launch car' was conservative.

[gwyllion]

It would have been a huge surprise if the car would still look the same as the version that rolled out mid 2013

Porsche spent more than 2000 hours in the wind tunnel at its own brand new facility in Weissach and at the University of Stuttgart.

[Spyderman]

A very interesting chat with Mark Webber at the Geneva Motor show.
http://www.youtube.com/watch?v=NnbPD...ure=youtu.be&a

[Spyderman]

http://www.autosport.com/news/report.php/id/112774

[manthey]

Originally Posted by PascaLM

The V4 2.0 l engine delivers 500 hp and more. Is it possible with a 30 l/100 km consumption ? With 500 hp and 8 MJ, this 919 could lap at the same pace than a R18 or a TS030 2013, even with narrower tyres ; however the ACO would like limit the times under 3'30".
I'd bet for a power around 480 hp.

can really Aco impose a "floor" time or do you mean will change something to slow down the cars is terms of aero/fuel/air restrictor?

[gwyllion]

In the autosport article Alex Hitzinger describes the updated aero package as an "evolution".

"Apart from the monocoque [surfaces], I don't think there is one part that is the same," he explained.

"A lot of the changes are in the detail, so you won't look at the the latest version and say there are two different cars."

[Flo aus N]

Originally Posted by manthey

can really Aco impose a "floor" time or do you mean will change something to slow down the cars is terms of aero/fuel/air restrictor?

lets wait... there are have been done some calculations in this forum, that the actuall peak power of the engine would be with that estimated targets ( set by ACO) at around 550-580 bhp, depending on the hybrid-class you choose.

But there are serious rumors ( and i have been told that twice) that at least Audi and although Porsche and Toyota are able to do better than the target efficiency by the combuston enginge, set by FIA and ACO.

[Richard C]

Between the photos from Sebring and the details in the Autosport article, I see nothing out of the ordinary. Its the type of changes you would expect to see, and I expect we will continue to see more as the season progresses.

Richard

[carbon_titanium]

We don't know the exact power amount of recent past cars like R15 or R15+, do we have the presumption to estimate the power of 2014 cars?
In my opinion the overall combined power of >700hp (or >750hp according to the values revealed by porsche) will be reached only in low speeds soon after a braking zone, when more than combined power, we should talk about combined torque of over 1000Nm released for a range of seconds. But in long straigh like mulsanne, in sixth or seventh speed when the hybrid boost has gone, I don't expect a final power over 520-530hp. The 1900mm width and low drag design will help to reach competitive top speeds despite the lack of a massive power.
Look at F1 bahrein test, in 2013 the top speed was around 315km/h (thermal engine + kers = >800hp). During the recent 2014 test, the average top speed was over 325km/h, with someone hitting also >330km/h (loss of more 100hp from 2013 cars).

[CyberMotor]

Originally Posted by TF110

I knew the 'launch car' was conservative.

Ummm, when speaking of prototypes, I'm not sure that calling one a "launch car" is wise.

[jimclark]

Originally Posted by CyberMotor

Ummm, when speaking of prototypes, I'm not sure that calling one a "launch car" is wise.

Indeed!!! None of this desired (I only post as Peter was okay)...

[PascaLM]

Originally Posted by manthey

can really Aco impose a "floor" time or do you mean will change something to slow down the cars is terms of aero/fuel/air restrictor?

I thought it was already done. Many signs show that the ACO and FIA work towards a compensation of the power decreasing in order to keep the same pace : narrower car to allow a best top speed, a seventh gear to make the most of the engine's torque.

[jimclark]

Originally Posted by PascaLM

a seventh gear to make the most of the engine's torque.

Ummm...or lack thereof...

[TF110]

The efficiency of the hybrids power will be a big deal. How much of that gained energy can they put back out will be key.

[MyNameIsNigel]

Don't know if this has been posted before, but racecar-engineering have published interesting illustrative diagrams of the Porsche 919 Hybrid:




(source: racecar-engineering.com)

[MyNameIsNigel]

Note that Racecar Engineering's current technical analysis still contains an apparently erroneous statement according to which the turbocharger would be linked to a "motor generator unit".

[gwyllion]

Yes, that analysis is completely wrong. The exhaust ERS only acts as a electric generator.

Someone on the Mulsanne's Corner facebook group did a good attempt at drawing the complex exhaust routing.

source: https://www.facebook.com/photo.php?fbid=744844848873236

You can see that the electric generator is in parallel to the turbocharger. However, a valve can be used to bypass the ERS turbine, presumably at low revs, such that the exhaust gasses only pass through the turbocharger (reducing lag).

BTW the technical drawings were already posted by deggis in http://tentenths.com/forum/showthread.php?p=3374782

[deggis]

The 3D drawings are here in huge resolution:

http://www.porsche.com/usa/eventsand...ybrid/gallery/

[MyNameIsNigel]

Interesting videos clips on Porsche's website BTW. These weird markings on the car spotted at Monza where definitely used to carry out CGI mappings on the real pictures:
"The car" video clip

There are two further video clips with interesting CGI effects: "Identity" / "Technology"

As regards the disclosed technical specs, I note that it is mentioned that the MGU on the front axle has a power output of 250 HP.

[gwyllion]

@MyNameIsNigel: You need to catch up the earlier posts in this thread

The direct link to these videos was already provided by deggis in the same post. And so was the 250 hp number for the front MGU.