Factory power upgrade for 996?

[Deep]

Hi guys.

I remember reading somewhere about a factory upgrade for 996s that took them from 320 to 340 BHP(or 300 to 320 BHP for earlier models).

Is this true?
If so why is it that when I scan the classifieds I never see one with the 'upgrade' advertised?

Also, if it does exist can it be retrofitted?

Many thanks
Deep

[big.bad.wolfie]

It's the X51 option. You won't see it in the 'Classifieds' as it consists of a number of engine mods performed to the standard 996 C2/4/4S engine. This is typically something done to the car at the factory rather than being a 'user/dealer installable part'

Damian

[roshambo]

As above. The X51 is the Carrera power upgrade & the X50 is the Turbo Power upgrade.
You probably don't see many used Carrera's with the X51 as its an expensive option for gaining about 20bhp so many dont bother when they buy a new car.
The X50/51 are retro-fittablem but its even more expensive to do it this way so again not many do.
You will see a fair few Turbo X50 cars as this is a desirable option giving lots more power/torque.

I am actually debating this at the moment, weather to get the X50 pack fitted by Porsche or go to a specialist tuner.

[Deep]

Thanks guys, I take what you say but out of 100s of classifieds I've scanned I've never seen ONE advertised. Just wondering why...Some rich bankers must have had them fitted!

Do you know what the X51 package consisted of? ie does that prove the claims of after market tuners who claim a 20 BHP + gains from just ECU fiddling or did Porsche change more on the engine?

Many thanks

ps Rosham, does'nt the X50 cost £8k?

[big.bad.wolfie]

Deep,

The X51 raises power output to 331 kW (450 bhp). Includes modified turbochargers, intercoolers, ECU and gearbox. Can be used with Tiptronic S.

The X50 raises power output to 254 kW (345 bhp). Includes modified cylinder heads, camshafts, exhaust manifolds, ECU, and aluminium-intake system. Not available on Tiptronic S.

Hope this helps,

Damian

[big.bad.wolfie]

X51 costs £8709.10
X50 costs £6644.63

[mikial]

I`ve the upgrade fitted to my C4s Cab, gives a more linear torque curve and an extra 20 bhp,also sounds pretty good with the sports exhaust.Not driven any other 996 ( save the GT3 ) for any period to know if the difference is noticable.

[clubsport]

big.bad.wolfie said:

Deep, The X50 raises power output to 331 kW (450 bhp). Includes modified turbochargers, intercoolers, ECU and gearbox. Can be used with Tiptronic S. The X51 raises power output to 254 kW (345 bhp). Includes modified cylinder heads, camshafts, exhaust manifolds, ECU, and aluminium-intake system. Not available on Tiptronic S. Hope this helps, Damian Thats more like it, to avoid any confusion

[roshambo]

Are those prices the right way round....? Does the X51 cost more than an X50 ?

[mikial]

Just checked the invoice £5655.00 plus vat.( C4s )

>> Edited by mikial on Tuesday 19th April 13:02

[BARRISIMO]

I looked into this for my 2002 C4s. Below is a web link for DMS automotive who are much cheaper than the factory fit. They have been featured in one of the Porsche specialist magazines and appear very clued up.

www.dmsautomotive.com/

This is what they told me:

They produce around 25 bhp and 10 lb/ft of torque. The increases are obtained by changes to the control maps for the varioram and variocam sytems together with changes to fuelling and timing. The resultant upgrade is undetectable by Porsche service and diagnostic equipment. The most significant changes are to the variocam settings. The result will produce a car that performs sharper and breathes easier towards the top end. Low throttle response will be improved. We have never tested officially a car with fifth wheel performance figures. In reality I would not expect to see any change in the 0-60 mph time. 0-100 should see around a second. I'm afraid top speed again is not something I can verify from experience. The upgrade effectively produces similar bhp gains as the factory camshaft and exhaust header upgrade.

Cost is £850 plus vat and can be carried out on site at no additional charge.

I questioned Porsche about the warranty implications and if they could detect it. They felt they would be able to detect it, fine to do it after the warranty is over. They did not feel it would do any harm.

Hope this hellps.

[lightweight]

X51 pack is more that a DMS re chip it has a new induction system and an extra oil pump.dont know what BHP DMS could give a power kit car.
it is expensive I have only seen it on 4 cars one a 3.4 996 C4 with a GT3 body kit that was 320bhp the others were 3.6 996 c2's (345bhp)on this car is is a great option but for the price a gt3 starts looks better value. There was also a v high spec blue 4S that was Chris C at AFN readings car but it looked like someone hade thrown up carbon all over the inside driving it made stripes apear over my eyes

[big.bad.wolfie]

BARRISIMO said:

I looked into this for my 2002 C4s. Below is a web link for DMS automotive who are much cheaper than the factory fit. They have been featured in one of the Porsche specialist magazines and appear very clued up. www.dmsautomotive.com/ This is what they told me: They produce around 25 bhp and 10 lb/ft of torque. The increases are obtained by changes to the control maps for the varioram and variocam sytems together with changes to fuelling and timing. The resultant upgrade is undetectable by Porsche service and diagnostic equipment. The most significant changes are to the variocam settings. The result will produce a car that performs sharper and breathes easier towards the top end. Low throttle response will be improved. We have never tested officially a car with fifth wheel performance figures. In reality I would not expect to see any change in the 0-60 mph time. 0-100 should see around a second. I'm afraid top speed again is not something I can verify from experience. The upgrade effectively produces similar bhp gains as the factory camshaft and exhaust header upgrade. Cost is £850 plus vat and can be carried out on site at no additional charge. I questioned Porsche about the warranty implications and if they could detect it. They felt they would be able to detect it, fine to do it after the warranty is over. They did not feel it would do any harm. Hope this hellps.

DMS and their 'undetectable' mods, is this the same 'undetectable' mod they do on the NA BMW M3? I bet an OPC can detect it and in some situations they will overwrite those so called changes.

Damian

[big.bad.wolfie]

roshambo said:

Are those prices the right way round....? Does the X51 cost more than an X50 ?

Whoops!