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The FAL is a decent option to consider in the UK, but the main issue is the underbody aero. In the UK we have speed bumps which you can straddle in a GT4, but you can't in the 4RS. FAL helps in this situation
Do you have a link to those numbers? I knew the Mags saved 10kgs, but haven’t seen a figure on the PCCB’s. Doesn’t this mass quadruple when on the go, and that’s why it’s so important to reduce it coming malted to the sprung mass? So I reckon my FAL’s extra wheight is countered just fine by the Mags & PCCB’s😎
Also I wonder if these options reduce the wheight of the car from its stated 1415kgs, or if that’s the lightest GT4RS build possible?
1415kg is the lightest possible GT4 RS theoretically however in reality difficult to replicate. Same for all Porsches and Ferraris
Interesting. I haven’t had a problem with the rear at all. Just the underbody aero. When looking at my car front on level with the chin spoiler the underbody aero seems to be the low point of the car. Would you mind checking your gt4RS? There may be differences between countries.
My car is due in 5 weeks but the rear is identical to the 718 gt4 and had one of those....my front lip had a couple of small scratches but the rear diffuser had considerable more damage. Luckily it can be replaced, same as the front lip.
Do you have a link to those numbers? I knew the Mags saved 10kgs, but haven’t seen a figure on the PCCB’s. Doesn’t this mass quadruple when on the go, and that’s why it’s so important to reduce it coming malted to the sprung mass? So I reckon my FAL’s extra wheight is countered just fine by the Mags & PCCB’s😎
Also I wonder if these options reduce the wheight of the car from its stated 1415kgs, or if that’s the lightest GT4RS build possible?
The Savage Geese video on the GT4RS had a Porsche prepared Power point presentation,It said with Mg wheels and PCCB 59.5 pounds were saved. I will provide more details and link or photos later today and try to find our if FAL is sprung or unsprung to answer your one question.
Since we are all dreaming here I wish magnesium wheels were a stand alone option just as PCCBs are. But Porsche puts the packages together as they do for added profit. Its a business and I don't blame them.
I am also glad they make all the 4 door vehicles, and they sell so well, because that allows all of us the have the 2 door models which provide so much fun.
Do you have a link to those numbers? I knew the Mags saved 10kgs, but haven’t seen a figure on the PCCB’s. Doesn’t this mass quadruple when on the go, and that’s why it’s so important to reduce it coming malted to the sprung mass? So I reckon my FAL’s extra wheight is countered just fine by the Mags & PCCB’s😎
Also I wonder if these options reduce the wheight of the car from its stated 1415kgs, or if that’s the lightest GT4RS build possible?
This is the best technical video on the GT4RS that I have found. I enjoy watching the entire video, packed with information:
So with the math the PCCB save 17Kg ( all 17 is unsprung, but not all of the 17 is rotating since the calipers are fixed)
Regarding the mass at 4X idea, I believe I have read in Herb Adams book entitled something to the effect of How to Make your Car Handle, that rotating unsprung mass is approximately 3X more important than sprung mass in terms of the performance of the vehicle. Mass is constant but force changes based upon speed.of rotation and forward speed of the vehicle.
Yes the mass of your FAL is divided as unsprung mass as shown in the blue arrow in the photo below, and is not rotating, so good, along with the compressor portion which would be sprung mass and even less important. So by getting Mg wheels and PCCB you have countered the mass of the FAL very well in terms of performance of the vehicle, and you should not have to hear scrapping of the vehicle as much or hopefully not at all.
Regarding your question if 1415 Kg is the lighest weight, I can't say, But yes the Mg wheels and PCCB reduce the weight further below the official reported weight. The weights reported may be based on standards in one country and are probably not the same in other countries (with or without fluids, etc).
AP said in Henry Catchpoles video at the introduction time of the 718 GT4 and Spyder that the regulation for reporting weight changed. Prior to the 718 manufacturers were allowed to select all the options that would make the car the lightest and report that to the public as the cars base weight. In the case of my Cayman R the weight reported was 1295 Kg, but that was with 6MT, no AC, no stereo, PCCB, Li-ion battery for $1800 US, and standard LWBS. But now with the 718 the rules are the weight is reported as the way the car comes standard with no option boxes ticked.
I think with the Weissach package, PCCB and Mg wheels you have one of the lightest GT4RS.If some of the carbon fiber options for the interior are ordered it may be a little lighter. A cheap way to loose weight is with the battery. For the 987 the standard battery was 24.5 Kg, the R standard battery was 20Kg, but a Honda Gold Wing motorcycle battery AGV, cost $130, and is still working fine for me for 11 years and only weighs 11 Kg.
FAL at blue arrow
Last edited by very green R; 12-04-2022 at 09:32 PM.
Reason: corrected math
Just to pick up a detail…. Are you showing the blue arrow as where the forces act? Or the position of the FAL unit on the damper?
FAL unit on each damper is higher up… above the carrier/knuckle and under the spring perch…. Red arrow.
AP has clearly stated on numerous U Tube interviews on the 992GT3 R/S that the official 1450Kg weight is with Weissach pack and in the lightest possible configuration. However he also said it was with a full tank of fuel. It’ll be the same with the GT4 R/S I suspect.
Gt4rs observation: the wing is seen in the rear view but doesn’t block too much view to make it dangerous but it does block all the blinding aftermarket lights in these lifted trucks in texas. It was a god send to keep me from being blinded while I drove my car home for 9 hours last night.
I have had my gt4rs for 3 weeks with FAL. Haven’t had any issues going over anything. I still treat the car like it’s my old gt4 with no FAL and angle all difficult terrain. Nothing hits front or rear of the the undercarriage doing this thus far.
The shape of the rear diffuser on the 4 RS may be less problematic with the nose lifted than the 3
12-04-2022, 06:08 AM
