05RollaXRS

Where is the actual documentation? Who was the driver? Was it pre-LSD or post-LSD? Was it bone stock? Please provide proof? Video? I have not seen that lap time recorded anywhere. I can find all kinds of details on all the laps I posted because they were done by European and American magazines. Nothing on FSW lap time. Therefore, you need to provide full details on the source otherwise, it does not count due to lack of information. RCF is quicker than Stingray on some tracks (SOW RCF - 1:24.0 Vette - 1:24.5), but I did not quote or conclude that because it is quicker than RCF on majority of the track and it should be.

Put it another way, LC500, ISF and GSF is slower than RCF on every track except VIR. RCF also has a gap with the M4 of 5 seconds around VIR, which is clearly an anomaly. Focus RS is quicker around VIR than the RCF while RCF is quicker on literally every other track. Even if I were to give RCF slower on this track, it is quicker on every other track. So, by rule of majority, RCF would be considered the much quicker car. Also, RCF shows much better handling, transition and dynamic characteristics due to 3 mph higher slalom speed and higher skidpad. 3 mph on the slalom is a significant difference in car's ability to tightly turn.

RCF is quicker on all, but 1 track. Both pre-LSD and post-LSD models are significantly slower than RCF on every other track. Put it another way, the gap on most tracks between an M4 and RCF is less than that of the RCF and ISF.

I will not go into hypotheticals here. What if RCF had 285/30 PS4S? Tires will not compensate for the power, chassis rigidity (which is higher for the RCF), lower CoG, suspension and dynamic advantages the RCF has.


Though, I agree it is not light years better, but FSW lap time is inconclusive without specifics of what model it was (with LSD or without LSD) and who was driving it? If it was Akira Iida or Kinosh'ita, who are also employed by Toyota then it is a variable that cannot measured. RCF is the significantly quicker car, if you put the same driver, on the same day and the same track. That is a fact. The chief engineer of both of these cars said that as they did many lead/follow laps around Nurburgring of both cars (including E92 M3).

I don't disagree.

Simple reason, turboes. If you review the data, RCF loses out on the straights to the M4 where it gets a 2 - 3 mph advantage. We picked RCF because we wanted an N/A high-revving engine. My two choices were either E90 M3 sedan (2013) or a 2015/2016 RCF. RCF engine is free-revving, revs quite high and sounds glorious at that 7450 rpm cut-off. I could have purchased an M4 for cheaper than RCF because lots to choose from, but I chose the RCF because of the engine (interior/exterior).

redspencer

iTrader: (1)

As requested on the FSW lap times, here is the press release (dated Sept 2009) for the 2010 IS-F which received an upgrade in the form of a Torsen LSD: https://www.pressroom.com.au/press_r...navSectionID=2


Motortrend provides the specific IS-F Fuji Speedway lap times but incorrectly source the two second improvement to the 2011 MY: http://www.motortrend.com/cars/lexus...us-is-f-drive/

Quote:

Originally Posted by MotorTrend

"The new model laps the 2.8-mile Fuji Speedway in 2 minutes, 3.4 seconds — nearly two seconds faster than its predecessor — thanks to Yaguchi’s subtle, yet substantial, modifications."

The only known lap time documentation that I could find for the RC-F was on a thread that you posted years ago which compared the times of a TOM's tuned RC-F (2:02.8) to a stock RC-F (2:03.7): https://www.clublexus.com/forums/rc-...edway-lap.html

05RollaXRS

Thanks for posting. Good information. That is nearly an official lap time with a press release by lexus to show improvements over the non-LSD model of 2 seconds/lap. It is like LFA's 7:14 Nurburgring lap times. TOM's lap time used their own two drivers and it seems like two drivers are testing out TOM's chassis components rather than a before/after. Yaguchi never revealed what their own RCF lap time was. Just said, it was faster around the track than the ISF in their lead/follow laps.

All of the lap times I put above, were by publishers/drivers who were unrelated to Lexus and had limited seat time.

This is a good comparison video of RCF vs LC500 on the same track, same publisher, different day that shows difference in on-limit handling characteristics of two cars where the LC500 consistently pushes nose out while RCF points nose inwards and slides tail out (where C&D VIR shows RCF as slower):

You Tube

Diesel350

Phinatic

What gauge/app is that being displayed on the console display?

05RollaXRS

It is the telemetry equipment called video Racelogic VBOX



That works great for stoplight-to-stoplight racing. If you look at high speed acceleration (best of) for each car, the AWD parasitic loss and power difference becomes apparent. 0 - 200 km/h (124 mph) or 0 - 150 mph where RCF gets to 2 seconds quicker. Also, RS5 lapped consistently slower on every track (in part because of 58/42 weight distribution).

finny76

So what is the most extreme weight reduction anyone has achieved by changing the (Battery, Suspension, Brakes, Exhaust & Tires)?