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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Mon Jan 24, 2011 5:02 pm    Post subject: Porsche Motorsport Division X51 PowerKit (320 PS/235KW) Reply with quote

The 996 X51 has an historical importance and pure engineering at its heart.

For two years this was the most powerful 4 seat or 4WD model (the Turbo had yet to be released).

Significantly, it is not just power output upgrades, having both additional cooling (centre radiator) and lubrication upgrades (high-G sump baffles, additional pump and oil lines).

Those two options are almost worth the entry ticket alone: as the 996 cylinder failures almost always involve the overheating and under lubrication of cylinder number 6, these modifications go someway to mitigating the seizures.

The 996 X51 was the sister model to the GT3 during development.

Porsche Motorsport Division parallel developed the narrow body C2 with C4 strengthened front chassis/body structure, track suspension and roll cage and even the aerodynamic Cup AeroKit (note: its note even officially called the GT3 kit), but with different engines.

The GT3 3.6 (M96/76) and X51 PowerKit 3.4 M96/01S engines were both developed together, in case what became the actual GT3 3.6 (GT1 derived block) failed racing regulations and/or reliability requirements for a successful homologation.

In other markets, such as Germany and Japan, these options (along with M030 sports chassis, bigger wheels and sports seats etc) were sold as one.

In the guise of a 2WD (but C4 chassis) 3.4 X51 with Cup Aerokit it was an additional model in its own right called the "Carrera Cup" in Germany and the oddly named "PowerUp" edition for Japan.

When they were released in the UK, the Cup AeroKit and PowerKit were separated as options (XAA and X51 respectively).

The X51 was almost certainly only given an additional 20 BHP for "political" reasons - the much more expensive GT3 996.1 3.6 M96/76 only developed 360 BHP.

In 2000 the X51PowerKit cost £8,725 from the factory.

Expensive as it was (and with on-paper low absolute power enhancement), at least the 996 PowerKit had extra lubrication efficacy (via a larger alloy racing sump baffle with valved apertures, dual chamber oil pump and additional lubrication plumbing on cylinders 4-6), additional third cooling radiator, high lift valves, revised camshaft and optimised (machined and polished) exhaust ducts.

The X51 was not available in the US in 996.1 guise.




Quote:
IN THE EXPLODED DIAGRAM:
7 Modified oil pan partition box (larger alloy baffles with aperture valving replaces small plastic baffles)
8 Uprated exhaust gasket for larger exhaust ducts
9 Adapted exhaust manifolds with larger cross-section and optimized flow behaviour
10 Alternative suction line on AC compressor (modified for space reasons)
11 Optimized inlet and exhaust ducts (machined and polished)
12 Modified intake system (modified cross-section - sand cast aluminium replacing plastic)

NOT SHOWN:
Revised cylinder heads
New 996 mark 1.1 revised swirl piston set (3.4 only)
Modified valves (including profile and longer shaft)
Larger lift camshaft
Additional dual chamber oil extraction pump
Additional oil extraction pipe (to service cylinders 4-6)
Additional third radiator (excl. C4S)
Alternate Tri-metallic catalytic converter
New shields for new oil suction pipe
New underside panel in transmission area
Modified fuel maps for DME (rev limit raised by 200 rpm)


Attached images:

Sand-cast aluminium cross-section modified intake system
Optimized exhaust ducts (machined and polished)
 



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Red993C4
Magny-Cours


Joined: 09 Dec 2010
Posts: 2723
Location: S. Wales


PostPosted: Mon Jan 24, 2011 6:00 pm    Post subject: Re: Porsche Motorsport Division X51 PowerKit (320 PS/235KW) Reply with quote

GT4 wrote:


The GT3 3.6 (M96/76) and X51 PowerKit 3.4 M96/01S engines were both developed together, in case what became the actual GT3 3.6 (GT1 derived block) failed racing regulations and/or reliability requirements for a successful homologation.


For what it's worth, your source did not get his information absolutely right. Whilst the development of the GT3 engine and the X51 Powerkit may have overlapped chronologically, they were not developed "together", since the X51 kit was developed by the same series-production motor team which developed the M96/01 base engine, not in the Motorsport division.
 
  
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teetooshuggerz
Monza


Joined: 18 Nov 2010
Posts: 198



PostPosted: Mon Jan 24, 2011 6:36 pm    Post subject: Reply with quote

Pop Corn
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Mon Jan 24, 2011 6:54 pm    Post subject: Reply with quote

I will pass your regards on to Adrian Streather.

By early 1998, the Porsche Motorsports division, under contract to develop the Pirelli Supercup and in house to develop the Carrera Cup cars for the 996 program, completed 30 prototype 3.4 M96/01 based development mules for testing.

Although the M96/76 and M96/01 are effectively completely different (one being a GT1 block, the other a Boxster block!), the original M96/01S PowerKit was overseen by the PMD.

Although in the end the "new" GT3 was a success and delivered both on time and within regulations, the PowerKit vehicles were its back-up plan and would have stepped in for at least that season. Not something you leave to the series-production motor team.

Subsequently, although not identical, the specifications and lessons learnt from the Pirrelli Supercup/Carerra Cup PowerKit vehicles formed the blueprint for the productionised retail X51 option.
 
  
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Red993C4
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Joined: 09 Dec 2010
Posts: 2723
Location: S. Wales


PostPosted: Mon Jan 24, 2011 7:18 pm    Post subject: Reply with quote

GT4 wrote:
I will pass your regards on to Adrian Streather.


I don't ever remember Adrian Streather being involved in the project, so he will have got his information second-hand.
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Mon Jan 24, 2011 9:23 pm    Post subject: Reply with quote

Unfortunately when he acknowledged Porsche AG for their assistance in writing the book, he did not specifically name any individuals.

So on that basis I cannot confirm or deny any further details.
 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Mon Jan 24, 2011 9:52 pm    Post subject: Reply with quote

Woah Paul, you'd better get reading. It would appear you've been trumped mate! Laughing
 
  
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Red993C4
Magny-Cours


Joined: 09 Dec 2010
Posts: 2723
Location: S. Wales


PostPosted: Mon Jan 24, 2011 10:15 pm    Post subject: Reply with quote

The Beast wrote:
Woah Paul, you'd better get reading. It would appear you've been trumped mate! Laughing


Hold on! It wasn't in any way my intention to "trump" someone. Hand

I just suffer from an allergic reaction when I read stuff in the net which I know not to be factual, because it can so quickly become urban myth.
You've surely heard the words: "It's got to be right, I read it in the internet". Very Happy

Where Streather's text is concerned, he'll probably have got his information through the PR department, if usual procedure was followed. An awful lot generally gets lost and "found" in both transmission and translation when an author or journalist has to put a piece together in that manner.
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Mon Jan 24, 2011 11:22 pm    Post subject: Reply with quote

As I say, on that basis I cannot confirm or deny any further details.

Until I hear or read any different, the account I have read still makes more sense to me than you simply disagreeing with a few words or, at worst, a sentence of a 40-line post.

However, X51 being of particular interest to me, I would be very grateful if you could direct me to any source(s) electronic or hard copy that would enhance my knowledge and understanding.

I, or you, could then update this thread to broaden all of our insight of Porsche history and engineering.

Don't keep it to yourself, otherwise only rumour and hearsay with continue to pervade the internet.

You can start with "the project" ...

 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Tue Jan 25, 2011 3:18 pm    Post subject: Reply with quote

Vroom Vroom..! Argey Bargey!

I'm just kidding with you both.. You know more about cars than me that's for sure, I just wash and go! Laughing
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Tue Jan 25, 2011 3:58 pm    Post subject: Reply with quote

Wash and go?

More like wash and gone. Razz
 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Tue Jan 25, 2011 5:05 pm    Post subject: Reply with quote

Floor Bloody excellent..! Thumb Bandit
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Tue Jan 25, 2011 6:10 pm    Post subject: Reply with quote

I'm allowed to say that as I, too, am in the unenviable position of choosing suitable pate attire for the summer season.

Quite pissed off last year, it was the first time I had to actually close the sunroof to prevent sunburn.

I had to bit the bullet and admit defeat by taking a cap with me for the subsequent drives. Sad
 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Tue Jan 25, 2011 6:39 pm    Post subject: Reply with quote

I know what you mean, but your pate isn't as polished as mine yet..! Don't forget The Beast comes from Transylvania and has been alive for hundred of years..!

I tried going faster to escape the sun's rays. That didn't work, so I went one better and bought a coupe. Now although I don't miss the sunburn I miss having the top down...! frustrated

The only solution is to drive along with my head sticking out of the window.. and according to your thread X51 has better cooling, so maybe the eventual solution will be to procure myself an X51 Cabriolet.. Grin
 
  
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Chief
Indianapolis


Joined: 16 Sep 2010
Posts: 2474
Location: The Middle lands


PostPosted: Tue Jan 25, 2011 7:34 pm    Post subject: Reply with quote

Look you are all going off topic here
I'm not sure about others but I for one will not rest easy until this is all shook up and sorted out......now what we know for a fact is it was definately a German fella..........sooooooooo

GT good informative thread & pics (as usual)
 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Tue Jan 25, 2011 7:47 pm    Post subject: Reply with quote

That's a good point!

Who was right then?

Loser will need to push twenty in the stream at the bottom of the garden and say six Hail Marys!
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Tue Jan 25, 2011 8:03 pm    Post subject: Reply with quote

Apparently we'll have to wait for the book and buy the answer.

Certainly I have read as much as I can find in Porsche books, Porsche forums and google in general.

One thing for sure is I wasn't there, so I only have what I read to go on, and until I find another source, that won't change.

There really isn't a great deal written about the original X51.

Even Porsche were tight-lipped about it in the brochures and price lists of the time, I know as I have now collected 1998 to 2005 996 brochures in electronic or hard-back variety.

Perhaps I should approach PCGB (the club and the car importer) and see what info or leverage they have on the factory.

I know I asked for the 996 X51 production numbers and the factory said they didn't even keep a tally of that during the production run. Dont know
 
  
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The Beast
Suzuka


Joined: 28 Jul 2010
Posts: 1159



PostPosted: Tue Jan 25, 2011 8:29 pm    Post subject: Reply with quote

Yeah but no but..

What if you're wrong? You'd have to pay the penalty.

I would leave it if I were you mate, this bloke sounds like he knows what he's talking about... Rolling Eyes
 
  
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Richard H
Magny-Cours


Joined: 29 Jun 2008
Posts: 2537
Location: Maidenhead, Berks.


PostPosted: Tue Jan 25, 2011 8:36 pm    Post subject: Reply with quote

Why not contact the Porsche Archive? (Especially as you say it is of Historical importance! Wink Wink )

http://www.porsche.com/international/aboutporsche/porschemuseum/porschearchive/

Contact details:
http://www.archive-bw.de/sixcms/list.php?page=seite_archivanschrift&sv%5Bid%5D=10346

I got some excellent info from them on production numbers via a Porsche journalist. If you ask, they can only say yes or no.
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Wed Jan 26, 2011 12:53 am    Post subject: Reply with quote

Thanks, my next job then.

In fact, I think I have found where I am spending this August:


puh
 
  
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