sal

what does the x51 package add in horsepower and other benifits and is it worth it?

Loren

X51 Power Kit
(from the tech bulletin describing installation)

"A parts set -"Carrera Powerkit"- is available to retrofit the standard engine with an increased performance of 254 kW (345 HP). The following parts in the engine are replaced, exchanged or modified to achieve this increased performance:
- new intake manifold with modified cross-section (material: sand cast aluminum );
- new intake pipe supports adapted to the form of the intake manifold;
- new exhaust manifolds with larger cross-section and optimized flow behavior;
- new cylinder heads with optimized, CNC-milled inlet ducts;
- new camshafts with larger valve stroke on the inlet side and modified inlet and outlet timing;
- inlet valve springs adapted to the enlarged valve stroke;
- modified partition box in the oil pan;
- modified maps for the DME control module.

The following steps are also taken on the vehicle:
- new underside panel in the transmission area;
- additional radiator in connection with modified front spoiler, except on the 911 Carrera 4S (996).

The higher-performance engine is also available as an option when ordering a new vehicles - 911 Carrera / 911 Carrera 4 /911 Carrera 4S /911 Targa - under Exclusive Option X51."

Ed Newman

The X51 kit is a engine upgrade to the standard M96 engine. It includes the cast aluminum GT3 intake manifold, larger headers, different cam shafts, modified cylinder heads, the third radiator and a re-programmed DME. The factory specs for the system are +25 hp and the 0-120mph time reduced by 1.0 seconds. I have driven both X51 and non-X51 back to back and find the X51 to have a more responsive throttle, noticably more power and no loss of low end torque. I woudl estimate it closer to +40 hp, but have not dyno'd my car yet.

Check out this link for more details...

<a href="http://www2.uk.porsche.com/english/gbr/accessories/exclusive/enhancement/default.htm" target="_blank">http://www2.uk.porsche.com/english/gbr/accessories/exclusive/enhancement/default.htm</a>

Ed996

Can this be fitted to a 2001 3.4 L

Ed Newman

Yes and no. The new kit does not fit, but there was a less powerful kit for the 3.4l motor.

ThunderC4S

Would you get better value (hp/per dollar) in just upgrading the standard 3.6 engine with aftermarket fabspeed headers and exhaust, DME reprogam and a EVO intake ?

Thunder
2002 Artic Silver C4S

Ed Newman

I honestly don't think you will get as much power. Look at how much Porsche does to get the extra power. Probably the same ratio though.

morganabowen

I notice that the cost issue has not been discussed If you want to improve the throttle response, what methods are there?? I am familiar with the Sprint Booster, but is there anything else to increase throttle response??