I own a 2017 GSF now but I just rented a 2018 M4 (Competition)

This modified RCF is slower than Type R on this small track...

Of course, that's because that RCF was much more heavy than Type R but was equipped with smaller and also less sticky tires...

In my opinion, the weight is not a problem if the car is equipped with stiffer suspension and decent tires!!!

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Of course, on open roads the RCF is MUCH faster than Type R!!!

100-200
RCF : 9.xx
Type R : 13.xx

練習我的英語! Use Goolge Translate if needed.
The new 2021 M4(8AT AWD) is even more heavy than RCF...

The additional weight is introduced for more stiff body which provides better and consistent steering/handling on high G cornering!!!

In addition, heavy cars provide more stable and comfortable rides on highways...
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This ultimate AMG is very fast on this track...

However, that AMG is much lighter than RCF but it is equipped with HUGE TRACK tires(275/325 vs 255/275)... So, of course, it will be very fast on the track...

Actually this AMG is not light at all. Its weight is 1640kg!!! (Huge track tires can fix that heavy weight!!!)

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Of course, big tires will slow down the speed somewhat. (Not good for street uses)

However, if you really want some fun on mountain roads or tracks, you definitely need some decent tires...
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I think the steering from my GSF is slower than G35S and M4(competition)...

You may think the quicker steering the better. In the past I agreed but now I think it's not always true...

G35S, M4 = quicker steering + less accurate and less feedback
GSF = slower steering + more accurate and more feedback

For G35S, M4, like I ride a bicycle FAST on a NARROW road.
For GSF, like I ride a bicycle SLOW on a WIDE road.

For high G or high speed cornering... GSF provides more confidence(or peace of mind), less nervousness and is easier to drive(or modulate)!!!
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This Panamera turbo is about the same fast as GSF/RCF in100-200...

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I wonder why GT-R is so much faster than RCF although both are about the same weight... (17xxkg)

Besides GT-R is about 2 seconds faster(7.xx vs 9.xx) in 100-200 and AWD, actually GT-R also has much better tires...

RCF : 255/35R19(F), 275/35R19(R) PSS
GT-R : 255/40/R20(F), 285/35R20(R) SP SPORT MAXX GT 600 DSST CTT

GT-R's tires are only slightly wider than RCF in rear but they are installed with 20 inch rims. So they are bigger.

In addition, SP SPORT MAXX GT 600 DSST CTT is just like RE-71R which is much more sticky tire... (no wonder GT-R is much faster on tracks)
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These track/street tires like SP SPORT MAXX GT 600 DSST CTT and RE-71R are very good on tracks but they suck on street as they are stiff, noisy, expensive, average on wet and short life...

I would rather increase the tire width. The shortcoming for increasing tire width is tire weight will be also increased and the additional weight will slow down the car's speed...

I think my GSF is already very fast... It's totally OK to slow down the car a little bit and increase performance, fun and safety on corners!!!
練習我的英語! Use Goolge Translate if needed.
This morning I drove my GSF on mountain roads for some fun...

I found a Fit was quite fast DOWNHILL!!!

I think that Fit's tires and suspension should be upgraded... This cheap car can also be very fun even though you just just modify it slightly... In addition, these light-weight cars don't need HUGE tires like my GSF to be very fast on mountain roads!!!
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