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Board: Porsche - 911 - 997
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Oct 26, 2006 8:46:31 AM
- Alex_997TT
- Rennteam Master
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- Loc: Reading , United Kingdom
- Posts: 3320, Gallery
- Registered on: Nov 20, 2005
- Reply to: 993c4
Re: X51 - 2005 and post 2005 engine differences
I've just been through this myself. See the X51 thread below.
Apparently the only difference between the 3.8L engines of pre-Aug05 and post-Aug05 are a difference in Intermediary shafts. This should not affect the application of X51.
So although unofficially Porsche say that putting the X51 on ANY Carrera S should in theory be fine, they cannot put that into writing as the powerkit was released after Aug05 thus no testing was done on engines before this.
Adding the X51 would therefore invalidate both the X51 2 year warrantee and also your cars warrantee.
Apparently the only difference between the 3.8L engines of pre-Aug05 and post-Aug05 are a difference in Intermediary shafts. This should not affect the application of X51.
So although unofficially Porsche say that putting the X51 on ANY Carrera S should in theory be fine, they cannot put that into writing as the powerkit was released after Aug05 thus no testing was done on engines before this.
Adding the X51 would therefore invalidate both the X51 2 year warrantee and also your cars warrantee.
Oct 26, 2006 9:52:22 PM
- jeffbco
- Pilot
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- Loc: Denver
- Posts: 494, Gallery
- Registered on: Mar 18, 2006
- Reply to: Alex_997TT
Re: X51 - 2005 and post 2005 engine differences
Quote:
Alex (UK) said:
I've just been through this myself. See the X51 thread below.
Apparently the only difference between the 3.8L engines of pre-Aug05 and post-Aug05 are a difference in Intermediary shafts. This should not affect the application of X51.
So although unofficially Porsche say that putting the X51 on ANY Carrera S should in theory be fine, they cannot put that into writing as the powerkit was released after Aug05 thus no testing was done on engines before this.
Adding the X51 would therefore invalidate both the X51 2 year warrantee and also your cars warrantee.
Does anyone know the VIN number cutoff for engines with pre- and post-Aug/05 differences?
Re: X51 - 2005 and post 2005 engine differences
Here's the major blurb on X51 from Excellence a few months ago; verrrrry interesting.
--------------------------
With the fluids properly warmed and a long onramp just ahead, it's time to put the X51 engine through its paces. In second gear and at full throttle, acceleration is strong - but then the same can be said for any Carrera S and even the 3.6-liter Carrera. The latest 3.8-liter 997s are powerful enough leave one wondering if there's much development potential left in the normally-aspirated flat six.
X51 answers that question convincingly, with a 997 Carrera S-like powerband that's as linear as it is strong. It offers good torque from just off idle all the way up to redline, but it can't match the GT3's top-end fervor. It feels slightly more "workhorse" to the high-strung GT3's thoroughbred. But, in a 911 more likely to be used every day than most GT3s will be, that's a good thing. The X51 3.8 offers tractable power everywhere, with plenty of good noises and enough zing to keep things interesting as it reaches for redline.
Does it feel faster than a plain Carrera S? Yes and no. No because it's tough to feel a seven percent power increase in a car that weighs more than 3,000 pounds and claims more than 350 horsepower. But informal roll-on tests in third and fourth gears later in the day saw the Club Coupe pull away from the 2005 997S slowly, but surely. It was exactly the difference you'd expect from a 26 hp/11 lb-ft advantage. Importantly, X51 gives up nothing across its powerband to the regular 3.8. Though its peak power and torque figures come 600 and 900 rpm later, the X51's powerband never dips below the 3.8's. Even from 1500-2000 rpm, it has a useful, 15 lb-ft advantage.
People after the best horsepower-per-dollar equation might be happier spending their $17,000 on the aftermarket, but X51 has two edges that must be considered: (1) it maintains the factory's full warranty and (2) there's a sweetness to this engine that can't be quantified. The throttle response in the X51-equipped 2006 997S was plain superior to the 2005 997S we tried. The revised motor sings through its powerband with an alacrity one wouldn't know the standard engine is missing - unless he or she tried an X51. Gear after gear, pull after pull to its 7300-rpm redline, the X51 engine is considerably more satisfying than the normal 3.8 - which itself is no slouch.
--------------------------
With the fluids properly warmed and a long onramp just ahead, it's time to put the X51 engine through its paces. In second gear and at full throttle, acceleration is strong - but then the same can be said for any Carrera S and even the 3.6-liter Carrera. The latest 3.8-liter 997s are powerful enough leave one wondering if there's much development potential left in the normally-aspirated flat six.
X51 answers that question convincingly, with a 997 Carrera S-like powerband that's as linear as it is strong. It offers good torque from just off idle all the way up to redline, but it can't match the GT3's top-end fervor. It feels slightly more "workhorse" to the high-strung GT3's thoroughbred. But, in a 911 more likely to be used every day than most GT3s will be, that's a good thing. The X51 3.8 offers tractable power everywhere, with plenty of good noises and enough zing to keep things interesting as it reaches for redline.
Does it feel faster than a plain Carrera S? Yes and no. No because it's tough to feel a seven percent power increase in a car that weighs more than 3,000 pounds and claims more than 350 horsepower. But informal roll-on tests in third and fourth gears later in the day saw the Club Coupe pull away from the 2005 997S slowly, but surely. It was exactly the difference you'd expect from a 26 hp/11 lb-ft advantage. Importantly, X51 gives up nothing across its powerband to the regular 3.8. Though its peak power and torque figures come 600 and 900 rpm later, the X51's powerband never dips below the 3.8's. Even from 1500-2000 rpm, it has a useful, 15 lb-ft advantage.
People after the best horsepower-per-dollar equation might be happier spending their $17,000 on the aftermarket, but X51 has two edges that must be considered: (1) it maintains the factory's full warranty and (2) there's a sweetness to this engine that can't be quantified. The throttle response in the X51-equipped 2006 997S was plain superior to the 2005 997S we tried. The revised motor sings through its powerband with an alacrity one wouldn't know the standard engine is missing - unless he or she tried an X51. Gear after gear, pull after pull to its 7300-rpm redline, the X51 engine is considerably more satisfying than the normal 3.8 - which itself is no slouch.
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