Since I had new suspensions on both cars, I thought Id take them onto my favorite roads on a back-back comparison. Here are the set-ups for each car.
M5: Ground Control coil-overs, corner balanced at 50/50 OEM sway bars, Kumho tires with 25k miles. RUF: Bilstein PSS9 coil-overs, corner balances at 48/52, TRG sway bars, Bridgestone S03 tires with 5k miles. Advantage RUF.
The route, my favorite: Page Mill Road to Arastradero Road, to Alpine Road, to Portola Road, to Woodside Road, to Highway 1, to Highway 92, to Highway 280, to home. Now the write-up:
Woodside Road offers up a series on S curves where you can throttle steer through. The M5 on OEM suspensions would toss like a boat, with body leans about the axis of the car clearly detectable. The occupants would also lean with each turn. With the GC, the leans are virtually gone, the turn-in and recoveries are both sharper than before. While I can still feel my innerds shifting with each turn, its not like a boat any more. The confident level in the car is much higher now. Where there are posted speeds on the curves, I can typically do 175% of the posted speed previously, now I can do about 200%.
The RUF takes these curves at 5-7 MPH higher than the M5. The steering is much sharper. Slight movements of the steering wheel allow me to toe the lines of the curves with surgical precision. There is NO lean at all. The Recaro seat is wonderful on these roads, I get road feel feedback from all over, my feet, my butt, and even my torso and shoulders. Gosh, I love these seats. The body chassis seems much stiffer in the RUF. The transitions between turns felt totally flat. The forward vision is also more dramatic. The sensation of seeing the road rush up against me with each turn is much more urgent in the RUF. The M5 is too civilized.
Five miles before Woodside Road hits Highway 1, it transitions form mountain twisties to rural flats with some fun curves thrown in as well. Both cars handle these high speed sweeps with aplomb. Again the RUF holds its 5-7 MPH advantage.
Highway 92 east-bound has a two lane up-hill section, where youd be going at 65+ MPH and it hits you with a 35 MPH left turn, on the Freeway!! The M5 took it at about 65+ and felt skittish. The RUF ate it up at 80+ and was bagging for more.
Exiting 280 I have a VERY tight 90 degree corner posted at 15 MPH. I love to double-clutch down-shift through this corner without braking. Previously, my M5 can take this corner at 30. With the GC, I took it at 35, the RUF went around the same turn at 42 MPH. One word on recovery, twice in the M5, the steering wheel did not straighten itself out fast enough after FAST turns. The RUF has quicker steering to begin with, and the recoveries were perfect at all times.
Coming out of tight turns in second gear, the RUF is infinitely more rewarding. The M5 hits me with the DSC many times as I throttled out of the turns. (Roads were damp so I left the DSC on to be safe) The RUF, being rear engine, I throttled out of turns and it just grips like a vice. In addition, the roar of the engine and the K29 kicking in added to the fury of the moment. It is truly what a world-class sports car should deliver to all the senses. Totally awesome and amazing. What a machine. Some of you may remember that the tech on my RUF is 90 degrees. Now I totally appreciate why. Doing the runs in second gear, I was flirting with red-line 80% of the time. This set-up keeps my eyes on the road and the rev. with minimum distraction. It is still tough to read the speedometer though. I had it set on the digital read-out right under the tech.
I was not out to test acceleration, but two instances stood out. Woodside Road has a stop sign where Id turn right onto north Highway 1. Highway 1 is a steep up-hill from there. About .2 miles up the grade, theres a road sign of 45 MPH. I drove both cars, standing start, WOT runs, red line shifts, the M5 hit the sign-spot at 62 MPH, and the RUF hit at 83 MPH. Another Spot, Highway 92 south-bound to 280, up-hill ramp, the M5 hit the top of the ramp merge point at 86 MPH, the RUF: 102 MPH. Needless to say, I braked at that point. The RUF is devastatingly fast. On the straights on Woodside Road, it is easy to be 100+ with the RUF. I really had to watch it.
Bottom line, both cars are phenomenal machines, much better than 99% of the offerings out there. As much as I love my M5 and as good as it is, I have to say that the RUF is much more fun, hands down.
Enjoy.
CP