GT3RS vs 911R weight discrepancy

[robgt3]

So according to Evo the 911R is claimed to be 50 Kilos lighter than an RS. I am a little intrigued. The manual gearbox is reckoned to be 20Kilos lighter so where is the other 30 coming from? I must assume that the R they tested had no sound system, sat nav and air con though how many people would order one devoid of those two features? Reinstate them and the weight difference is getting closer. The RS body must be a little heavier though I cannot believe by that much. The 911R rear spoiler is driven by a motor so that must add a few Kilos, the RS has of course a carbon fibre fixed wing . I accept the RS wheels and tyres are bigger and heavier, but not 30 Kilos. The magnesium roof and carbon fibre body panels are fitted to both models.
Question is what is the true difference in weight between the two cars? For comparison purposes let's take an R with Air Con, sat nav and sound system and pop it on the scales next to an RS kitted out the same with the addition of ceramic brakes and carbon full bucket seats. I'm sure that the true weight difference other than the manual gear box will be very little.
It's all down to very clever marketing by Porsche who are brilliant at finding market niches.

[Glenncakeman]

Roll cage and fire extinguisher ?

Wider wheels and rubber Deffo add up too.

[MDL111]

as said above/ideas

wheels/rims (a few kg)
cage (gotta be a few kg)
PCCB (prbably 10kg vs a steel RS)
manual tranny (20kg)
sound deadening material (from memory 4.5kg)
flywheel (is it lighter than the RS one?)
does it have a lighweight battery?

ultimately 50kg is not that much on a still relatively heavy car

[lsb]

The exhaust system is fully Titanium. That must save a few kilos as well.

[isaldiri]

MDL111 said:

as said above/ideas

wheels/rims (a few kg)
cage (gotta be a few kg)
PCCB (prbably 10kg vs a steel RS)
manual tranny (20kg)
sound deadening material (from memory 4.5kg)
flywheel (is it lighter than the RS one?)
does it have a lighweight battery?

ultimately 50kg is not that much on a still relatively heavy car

The RS factory weight is quoted with all possible lightweight options and option delete where possible. 1420kg RS factory weight means no radio, no cage, no aircon, with lithium battery and ceramics. Customer R likely will weigh a good bit lighter than 50kg over a customer RS. Would say the wider body and wheels plus gearbox with less sound proofing and lighter flywheel would easily account for ~50kg.