Tune: Chevy Corvette Z06 RM (G27 Wheel)
620PP had me considering virtually every supercar I own, but with sports soft tires traction out in lower gears is a precious commodity. I opted for the Z06 as it's a feather weight with a very smooth power delivery (I was afraid the ZR1 RM might blow apart the rear tires with its supercharger) and looking over the track list I I figured if I could smack the throttle WFO in those 2nd gear corner exits even a half-baked quick tune could win these races. Running low weight means less workload on the chassis which allows the car to run softer for diving into those low-speed corners, coupled with less ponies coming in a powerband that was smooth-as-butter and as predictable as death and taxes I was banking on being able to consistently leave the corners on the gas like Burt Reynolds in a Trans Am. Without the need for precise throttle control in 2nd or 3rd I could concentrate on consistent lap times (not to mention minor handling tweaks) as opposed to avoiding a sideways soap opera (I run no aids/ABS normally but I used ABS 1 here to gain serious time with later braking).
The bottom line? This thing laid a smackdown and has a LOT of room to use the power limiter to drop the PP (I'm scared to think what the aliens might pull off here). I had never driven the Z06 RM in this game (don't do many RM races and with over 1600 cars it kind of got lost in the mix), the tune was 100% untested, I was barely awake and driving like I got my license yesterday, and my brilliant idea was take it straight to Eifel which of course I'd never even seen before. Halfway through lap 2 I was in 2nd place and less than 3 seconds behind 1st place (once again I've never seen this track so clearly this car can blow the doors off this field). The Audi R8 behind me decided to pull an epic pit maneuver and I landed in 5th over 15 seconds behind. After spinning off the track 3 times I was on lap 5 back in 2nd place and once again 2.6 seconds behind the 1st place Cerbera Speed 12 (I think the XJ220 was involved in a New York City traffic jam on the 1st lap). BAM! Audi plays Sheriff Buford T. Justice again in the same 2nd gear uphill left-hander, and now I'm back in 5th facing the wrong way! I get it whipped back around and still manage to take 3rd in the last few corners. Second time around? With a slightly tail-happy rear (corrected issue before posting tune) I was able to just cruise the car around to easily take 1st place on lap 4 (had "minor technical difficulties with the steering" causing me to suddenly swerve and push an R8 into a wall during lap 2 but it only seemed to happen that one time, darn those gremlins). I ran it soft on lap 5 for a 1:31 and a mind-numbingly easy 1st place.
Upgrades
Oil change
Race modification
ECU tuning
Catalytic converter
LSD
Power ~580hp
NOTE: I don't advise the stage 3 engine. While I did not test it on an RM (I do run a full mod minus blower street Z06 in online races) this information is true of GT5 street/RM cars in general. Pole position in one race will finance a new Z06 RM if necessary but I'd do that before limiting a stage 3 car. This upgrade pushes the engine's power into the high range more than any other, this creates more of a burst of power at higher revs and low-end torque suffers; this creates a bog then power-on effect as engine speed increases, similar to turbo lag. This can upset the balance of the car when applying throttle after the apex in lower gears: without it the incredibly linear powerband hooks and takes off like a missile even in 2nd gear, since the car can hit 620PP without it you see no benefit and merely run the risk of breaking traction more easily. The ECU, catalytic converter, and exhaust also produce this effect to a degree but the car had no issues, I stuck with the cat and ECU since they give me a hair more room in each gear.
Downforce
27/50
I played with this a bit to dial in the steering response, you might find yourself moving the front a couple clicks but this worked well for me so I left well enough alone.
Ballast
None
NOOOOO!!!!!! Don't do it! You've lost so much weight little Z06, don't get off your diet plan just because it's the Christmas season!
Transmission
1st 2.660
2nd 1.780
3rd 1.300
4th 1.000
5th 0.820
6th 0.680
Final 4.230
Should work for all tracks but I didn't test it on Indy, if it tops out I'm pretty sure a 4.110 final would suffice without needing to make any other tweaks.
LSD
Initial 5
Accel 12
Decel 10
I left the initial unlocked to keep low-speed maneuverability, the decel worked well with the amount of driveline lock during downshifts so I never touched it. With accel at 12 the outside tire can have a hair of push in 2nd gear corner exits with the gas on the floor, probably never notice it with less power but it was so minimal even at 620PP I didn't feel the need to dial it in 100% perfectly.
Suspension
Ride height 0/0
Spring rates 10.0/6.0
Extension 4/4
Compression 4/4
Sway bars 4/4
Camber 1.5/1.8
Toe +0.10 (yes POSITIVE front toe)/0.00
With the weight low I could run softer suspension for slower corners without sacrificing much in the sweepers. I could just floor it and zoom past the competition in most anything 3rd gear or faster. With very little weight acting against the suspension the downforce squats the car down enough to keep it as flat as people used to think the earth was, even on relatively soft settings, and in those 2nd gear corners you won't be going fast enough for much of any aerodynamic effect so the car retains enough suspension travel to keep up with the other cars in the technical stuff. The trick is to not get too greedy focusing on those slower bends by dialing up static camber and such, if you let the front end corner faster than the back your tires you may soon be qualifying for the next D1 event. Running front toe at 0.00 will corner a bit sharper but on Eifel I liked 0.10 for making the rear a bit less likely to kick around on those sloped corners.
Don't expect this car to gain much ground through the tight corners themselves, the goal was merely to make it not lose time there, where you'll gain time is when you jam the loud pedal down to slingshot out while the other cars must go easy to maintain traction. This makes slipping by a car or two between corners a simple task then in the high-speed twisties you can go balls-out and gain time as if you had an afterburner.
Brakes
6/6
This car will be reaching significantly higher speeds than anything else on the track even over very short distances, once again this is where the very low weight is an advantage. I'm a religious anti-ABS activist but I ran ABS 1 simply because the brakes are huge with very little car to slow down, use this for all it's worth and racing with this car is like cracking an egg with a sledgehammer. It was tuned to be very controllable, predictable, and forgiving so less-experienced racers can enjoy it and running consistent drama-free lap times is a breeze!
Special Stage Route 5
This one honestly comes down more to the driver than some others and the car can't win it for you. I just went a totally new sheet and started from scratch. While I'm willing to provide a good baseline that others can use and tweak a bit, such as the one above, I have good money invested in my knowledge of high-performance cars and being that my driving is not up to the caliber of some I like to compete against I rely more on my tuning to level the playing field. Unfortunately, due to this one being a completely different project as a precise setup with a few tricks I use for competitive online racing, I will not be sharing details of the tune I used for winning this event.