Quick '06 C4S X51 question
Thread Starter
Racer
Joined: Aug 2004
Posts: 282
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From: Temecula, CA
Quick '06 C4S X51 question
What exactly did the X51 option add to the C4S in '06? Also, is it really a $20k dealer installed option? Am looking at an '06 with this and am not sure exactly what it is - seller claims 381HP w/option. Thanks for the help.
Peter
Peter
Three Wheelin'
Joined: Oct 2004
Posts: 1,696
Likes: 47
From: Stevenson Ranch, CA
I had it in my 2006 as a Factory Option for $16,900. If it was dealer installed that means motor has been out of the car and partially dis-assembled if that matters to you. 381 HP is correct. Heads, airbox,headers, ecu, sport exhaust are the main differences.
Thread Starter
Racer
Joined: Aug 2004
Posts: 282
Likes: 0
From: Temecula, CA
Thanks - it was dealer installed at Pioneer Porsche I think or Hoen in SD. Car is still warrantied till June '10 and is $10k cheaper than a '04 turbo - makes the little lady happy - gets me a wide body cab, a warranty, and an 11 year newer car - plus 100hp. Sounding interesting and I may be able to get it CPO'd - even better.
Poseur
Rennlist Member
Rennlist Member
Joined: Nov 2005
Posts: 17,731
Likes: 289
From: Santa Barbara, CA
It was the best solution and alternative to a GT3 (which they had not introduced yet) but with hte added benefit of a back seat. When introduced, there was no 997T either. Personally, I think it's still the way to go.
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Rennlist Member
Joined: Nov 2001
Posts: 1,286
Likes: 4
From: CA
X-51 on the 997 included a variety of engine modifications including:
- sand cast intake manifold with dual snorkel carbon fiber airbox
- Dual air filter elements (had to be special ordered during service...)
- larger diameter air intake/butterfly
- hand finished cylinder heads with stronger exhaust valve springs
- full exhaust header system
- re-mapped ECU with 200 rpm higher rev limit (7400 vs 7200) when in Sport mode.
- Porsche Sport Exhaust
- Extra radiator in center opening of front bumper cover.
There was much speculation about different camshafts due to ambiguous language in the Porsche factory literature. While never getting a straight answer, I now believe the camshafts are the same as the standard Carrera S.
FWIW, I dynoed my car and obtained 337hp at the wheels. Using standard 15% driveline losses, that translates to about 396 at the crankshaft. In addition, I was unable to obtain a dyno run in Sport mode because the computer went into fault due to the rear wheels turning and the fronts not turning. So we never got a run with the Sport fuel profile or 7400 rpm redline. Engine pulled very strong right up to the fuel cutoff.
If you aren't driving on the track or driving aggressively on the street, you probably would seldom notice. As for re-sale, I don't think it adds more than a few thousand dollars to the resale value.
If you are into track days and/or drive the car very hard, it's a very nice option. The engine has an eagerness, especially at higher rpm's, that is very enjoyable. Plus, the extra cooling is good for engine longetivity. I've put over 1,500 track miles on my car and currently have 73k on the odometer without any problems. I bounce of the rev-limiter frequently at the track. The car burns about a quart of oil every 6k miles.
MC
- sand cast intake manifold with dual snorkel carbon fiber airbox
- Dual air filter elements (had to be special ordered during service...)
- larger diameter air intake/butterfly
- hand finished cylinder heads with stronger exhaust valve springs
- full exhaust header system
- re-mapped ECU with 200 rpm higher rev limit (7400 vs 7200) when in Sport mode.
- Porsche Sport Exhaust
- Extra radiator in center opening of front bumper cover.
There was much speculation about different camshafts due to ambiguous language in the Porsche factory literature. While never getting a straight answer, I now believe the camshafts are the same as the standard Carrera S.
FWIW, I dynoed my car and obtained 337hp at the wheels. Using standard 15% driveline losses, that translates to about 396 at the crankshaft. In addition, I was unable to obtain a dyno run in Sport mode because the computer went into fault due to the rear wheels turning and the fronts not turning. So we never got a run with the Sport fuel profile or 7400 rpm redline. Engine pulled very strong right up to the fuel cutoff.
If you aren't driving on the track or driving aggressively on the street, you probably would seldom notice. As for re-sale, I don't think it adds more than a few thousand dollars to the resale value.
If you are into track days and/or drive the car very hard, it's a very nice option. The engine has an eagerness, especially at higher rpm's, that is very enjoyable. Plus, the extra cooling is good for engine longetivity. I've put over 1,500 track miles on my car and currently have 73k on the odometer without any problems. I bounce of the rev-limiter frequently at the track. The car burns about a quart of oil every 6k miles.
MC
Last edited by H20NOO; Oct 30, 2009 at 07:53 PM.
Burning Brakes
Joined: Dec 2006
Posts: 781
Likes: 1
X-51 on the 997 included a variety of engine modifications including:
- sand cast intake manifold with dual snorkel carbon fiber airbox
- Dual air filter elements (had to be special ordered during service...)
- larger diameter air intake/butterfly
- hand finished cylinder heads with stronger exhaust valve springs
- full exhaust header system
- re-mapped ECU with 200 rpm higher rev limit (7400 vs 7200) when in Sport mode.
- Porsche Sport Exhaust
- Extra radiator in center opening of front bumper cover.
There was much speculation about different camshafts due to ambiguous language in the Porsche factory literature. While never getting a straight answer, I now believe the camshafts are the same as the standard Carrera S.
FWIW, I dynoed my car and obtained 337hp at the wheels. Using standard 15% driveline losses, that translates to about 396 at the crankshaft. In addition, I was unable to obtain a dyno run in Sport mode because the computer went into fault due to the rear wheels turning and the fronts not turning. So we never got a run with the Sport fuel profile or 7400 rpm redline. Engine pulled very strong right up to the fuel cutoff.
If you aren't driving on the track or driving aggressively on the street, you probably would seldom notice. As for re-sale, I don't think it adds more than a few thousand dollars to the resale value.
If you are into track days and/or drive the car very hard, it's a very nice option. The engine has an eagerness, especially at higher rpm's, that is very enjoyable. Plus, the extra cooling is good for engine longetivity. I've put over 1,500 track miles on my car and currently have 73k on the odometer without any problems. I bounce of the rev-limiter frequently at the track. The car burns about a quart of oil every 6k miles.
MC
- sand cast intake manifold with dual snorkel carbon fiber airbox
- Dual air filter elements (had to be special ordered during service...)
- larger diameter air intake/butterfly
- hand finished cylinder heads with stronger exhaust valve springs
- full exhaust header system
- re-mapped ECU with 200 rpm higher rev limit (7400 vs 7200) when in Sport mode.
- Porsche Sport Exhaust
- Extra radiator in center opening of front bumper cover.
There was much speculation about different camshafts due to ambiguous language in the Porsche factory literature. While never getting a straight answer, I now believe the camshafts are the same as the standard Carrera S.
FWIW, I dynoed my car and obtained 337hp at the wheels. Using standard 15% driveline losses, that translates to about 396 at the crankshaft. In addition, I was unable to obtain a dyno run in Sport mode because the computer went into fault due to the rear wheels turning and the fronts not turning. So we never got a run with the Sport fuel profile or 7400 rpm redline. Engine pulled very strong right up to the fuel cutoff.
If you aren't driving on the track or driving aggressively on the street, you probably would seldom notice. As for re-sale, I don't think it adds more than a few thousand dollars to the resale value.
If you are into track days and/or drive the car very hard, it's a very nice option. The engine has an eagerness, especially at higher rpm's, that is very enjoyable. Plus, the extra cooling is good for engine longetivity. I've put over 1,500 track miles on my car and currently have 73k on the odometer without any problems. I bounce of the rev-limiter frequently at the track. The car burns about a quart of oil every 6k miles.
MC
I am in the process of what I call the X51 light...all the parts but the heads. The heads are $10k to the price tag for what has to be a marginal improvement as the OEM heads have to be good enough to make 93HP/Litre under 7k rpm.
Are you running sport cats to get the 337 number?
Dave
Three Wheelin'
Joined: Jun 2007
Posts: 1,759
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From: The D
It is no doubt a great option to have. It is tough when you think the first 355hp will cost you about $15K (price of replacement engine) and for an additional 26hp it will only set you back another $17K. Somehow it doesn't pass the smell test. It should be a steal to get via resale. My guess is the resale value for this option will be far less than any other option.
