CK: Sq også på tide...har vi set 2 stks bare på Nürburgring ?
Specielt ved Phlanzgaten hvor hjulet var helt clean røget af og ingen skade eller andet på bilen
Og så kom endelig indrømmelsen fra Porsche om, at deres centerlås system på 997 modellener noget lort. ikke kan holde til at blive brugt - og faktisk kan være direkte livsfarligt for ejere når pisset bryder sammen, og bilen taber hjulet.
Og alt det har krævet er en række videoer af biler der taber et baghjul på bane, og nogle forumkrigere der har skrevet ogbeskerevet problemet i 2 år.
Udover, at Porsche jo allerede har indkaldt til en udskiftning for nye centerlåse og en ændring af tilspændingsmomentet på alle modellerne.
Porsche 911 GT3 Wheel Hub Recall
Recall Summary
Porsche 911 GT3 wheel hubs may break.
Recall Issue
Porsche is recalling some of their 911 GT3s because of the possibility of the rear hubs breaking.
Porscheâs full explanation is - Current market observations have shows that the track usage of many vehicles in the 911 model line now comes close to that of pure GT3 racing vehicles. The component stresses associated with racetrack use and competitive driving are much higher than for a sporty driving style on public roads. The revision intervals for race track use = technical information ACO5 revision intervals for racetrack use must be observed, particularly for highly stressed chassis components, in the same way as is required for GT3 racing vehicles. If these revision intervals are not observed, the failure of highly stressed components and breakage of hubs on the rear axle, for example, cannot be ruled out, particularly in the case of components in advanced stages of wear.
Porsche is recalling the affected 911 GT3s and replacing the wheel hubs.
Porsche 911 GT3s Affected By This Recall
There are 79 Porsche 911 GT3s affected by this recall. They have VINs in the range - WP0ZZZ99ZAS780067 to WP0ZZZ99ZAS781223.
What Should Porsche 911 GT3 Owners Do?
If you have, or believe you may have, one of the affected Porsche 911 GT3s then please contact your local dealer.
WhiteDog / Magnussen>
Klippet fra Wikipedia (selv om jeg godt ved at det ikke er en endegyldig facitliste):
1997–2010
Between 1997 and 2010, the regulations mandated that World Rally Cars must have been built upon a production car with a minimum production run of 2500 units. A number of modifications could be made including increasing the engine displacement up to 2.0L, forced induction (including an anti-lag system), addition of four wheel drive, fitment of a sequential gearbox, aerodynamic body modifications, weight reduction to a minimum of 1230 kg and chassis strengthening for greater rigidity.
Unlike the requirements for the preceding Group A cars, manufacturers were no longer required to build "homologation specials" in order to meet approval. The base model did not need to have all the characteristics of the WRC car, as evidenced from cars such the Peugeot 206, 307, Citroën Xsara and Škoda Fabia, which during this period had no road car variant with a turbocharged petrol engine or four wheel drive.
To limit power, all forced induction cars were fitted with a 34 mm diameter air restrictor before the turbocharger inlet, limiting the air flow to about 10 cubic meters per minute. The restriction was intended to limited power output to 300 hp although some WRC engines were believed to produce around 330–340 hp. Engine development did not focus on peak power output but towards producing a very wide powerband (or power curve). Typically, power output in excess of 300 hp was available from 3000 rpm to the 7500 rpm maximum, with a peak of 330–340 hp at around 5500 rpm. At 2000 rpm (the engine idle speed in "stage" mode) power output was slightly above 200 hp.
2011–present
Starting in 2011, rules for WRC cars have changed to be more restrictive. Now the regulations are derived from the ones for S2000 cars, with a different engine and an aerodynamic kit. The cars are smaller models (there is no longer a minimum 4m length), with a 1600 cm3 direct injection turbo engine with a 33 mm diameter air restrictor and a maximum pressure of 2.5 bar absolute (this will limit torque to about 400 N.m or less[3]). Exotic materials (titanium, magnesium, ceramics and composite) are forbidden except when present in the base model. Carbon fibre and aramid fibre are very restricted ("only one layer of fabric is used and is affixed to the visible face of the part"), except for bodyworkâs side protections where multiple layers of aramid fibre are allowed. The gear changes must be made with a mechanical system (so paddle shifters are not allowed). There is no center differential (earlier it used to be 3 differentials, with a center/3rd differential included), but the new regulation allows only front and rear axle differential (eliminating the center differential to run down on the cost and make it more economical), and they must be mechanical, without electronic control or hydraulic or viscous systems (from 2006 to 2010 the center differential and previously all 3 could be active[4]). Minimum weight is 1200 kg empty and 1350 kg with driver and co-driver (in both cases with only one spare wheel).
Så altså hvis det passer at 1997-2010 specs. var 200 HK @ 2.000 RPM og 300 HK @ 3.000 RPM, svarer dette til at der var 702 Nm ved begge disse punkter.
183592 - From:
WhiteDog
16/12/2012 21:58
Well i dag pga. den lille 1.6âer (bruges bl.a. af Citroen og VW - har lige læst op på det) ligger de på omkring 300-350nm. 2.0âerne havde omkring 500-550nm, bare længere nede, grundet max effekt på 300hk.
750nm skal vi vidst mindst 15 år tilbage, hvis ikke mere. Jeg mindes i hvert fald ikke en 2.0 med 300hk begrænsning, som skulle yde 750nm. Men jeg kan tage fejl
Men nok om det. En ting er sikkert. De er imponerende og motorne er unikke.
183591 - From:
Magnussen
16/12/2012 21:44
Hvidhund, ved ik hvad poloen er sat sammen af, men de gamle 2.0l motor lavede omkring 750 nm. Men der findes jo mange klasser i rally, og følger ikke med mere, så ved intet om de nye biler. Men derfor er det stadig ekstreme forhold de arbejder under de små motor.
EDIT: så læste jeg lidt på sagen. I 2011 gik de over til 1.6l motor. Polo har ca. 315 hk, og det forventes at de små 1.6l laver over 600 nm. 37mm indsugnings hul i turboen (begrænsning), og 4-5 bar ladetryk så køre det...
183590 - From:
WhiteDog
16/12/2012 21:43
Jep det ved jeg godt. Men jeg mener stadigvæk at det er en 1.6âer.
