Analyzing the 500pp class (tires and car selection)

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DISCLAIMER:This analysis was performed with the 1.06 patch. 1.07 patch removes tire selection from performance points making some of these conclusions (and lap times) null and void.

I wanted to see how I could get the most out of a 500pp class. I selected 3 different cars that I might think about racing from my stable. Car 1 has lots of mods, car 2 has a few mods, and car 3 is bone stock. I also wanted to experiment with tire selection to see whether sacrificing grip over horse power would yield some benefits.

Car 1: '86 Toyota MR2 Supercharger
Setup: modded w/wing, tuned suspension, LSD, no power reduction or ballast
Weight: 910 kg / 910 kg
Power: 269 hp / 205 hp
Torque: 264 ft-lb / 188 ft-lb
P/W: .295 / .225

Car 2: '90 Mazda RX-7 GT-X (FC)
Setup: modded w/o wing, tuned suspension, LSD, no power reduction or ballast
Weight: 1060 kg / 1060 kg
Power: 320 hp / 241 hp
Torque: 314 ft-lb / 225 ft-lb
P/W: .301 / .227

Car 3: '09 Nissan GT-R SpecV (GT Academy Version)
Setup: bone stock, power reduction for SS, power+ballast for RS.
Weight: 1680 kg / 1753 kg
Power: 329 hp / 240 hp
Torque: 436 ft-lb / 425 ft-lb
P/W: .195 / .136

UPDATE:
The cars below were added to try to beat the GT-R trial mtn time. I only ran on racing soft tires since it became apparent that sport soft were slower across the board on this track.

Car 4: '95 RX-7 Type RZ
Setup: modded w/o wing, tuned suspension, LSD, no power reduction or ballast
Weight: xxx / 1250 kg
Power: xxx / 271hp
Torque: xxx / 225 ft-lbs

Car 5: '07 RX-8 Type S
Setup: intake, racing filter, tuned suspension, LSD
Weight: xxx / 1310 kg
Power: xxx / ~260 hp
Weight: xxx / ~230 ft-lbs

Trial Mountain Circuit:
Car 1: 1:36.716 / 1:34.008
Car 2: 1:36.571 / 1:33.810 1:32.646
Car 3: 1:34.798 / 1:32.991 1:31.519
Car 4: xxxxxxxx / 1:31.952
Car 5: xxxxxxxx / 1:30.083

Suzaka (full course):
Car 1: 2:21.047 / 2:19.152
Car 2: 2:19.415 / 2:18.345
Car 3: 2:18.008 / 2:20.505


Analysis:

First off, even with giving these cars the same tires, they handled very differently around the courses. Weight and downforce played a key roll in speeds around corners. The MR2 was at the limit of lateral grip on every turn...entry,mid corner, and exit. The RX-7 required earlier turn-in to induce a little oversteer. The GT-R basically coasted around the track with very little effort.

For Trial Mountain, which has very short straights, it is clear that racing soft tires will produce faster laps and overall corner grip was far more important than hp. The heavier GT-R could run flat out while the MR2 and RX-7 with significantly less downforce needed to use more gas/brake to keep up. But in the end the smooth running GT-R produced the fastest lap time.

For Suzaka, which has longer straights and faster sweeping turns, grip still played a roll but there was a limit. Both the MR2 and RX-7 fared better on racing soft tires with less power. It allowed me to take turns before the straights quicker and the hp advantage of running sports tires never quite overcame the slowness in the twisties. The GT-R however was a lesson in how much detuning is too much. In order to add the racing soft tires I had to run at 50% power AND add some weight. It was so slow through the straights that I produced faster times on the sports tires. In fact it was so slow that I was a second faster in the RX-7 on sports tires and came within .5 seconds in the MR2! However the GT-R simply doesn't need racing tires to be quick. It beat out the RX-7 on racing tires by 3/10ths with only using sport soft.

As far as fun factor goes, I think I'd rather lose a race driving the MR2 or RX-7 than win the race in the GT-R. People say that racing tires make the game to arcade-like. Well the GT-R even on Sport Soft tires is pretty arcade-like at this pp level. I doubt I will be using it in online lobbies despite it being a few seconds quicker. In general though, I think I will stop paying such close attention to picking light weight cars. When running soft tires, the weight is key in keeping the wheels on the ground.
 
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2 things,

I don't understand how the top two cars went faster with the same weight but significantly less power.

Also, would it not have been more reliable to test cars that are roughly the same age/generation etc. The GTR is modelled on a car that is full of on board electronics and a modern design/suspension layout. I think this would mean that with roughly the same power/weight, I would generally expect a car 20-25 years newer would be faster pretty much every time.

I'm liking the idea of the test though mate.
 
2 things,
I don't understand how the top two cars went faster with the same weight but significantly less power.

Also, would it not have been more reliable to test cars that are roughly the same age/generation etc. The GTR is modelled on a car that is full of on board electronics and a modern design/suspension layout. I think this would mean that with roughly the same power/weight, I would generally expect a car 20-25 years newer would be faster pretty much every time.

I'm liking the idea of the test though mate.

For each car, I ran laps with sport soft tires and racing soft tires. When you switch from sport to racing tires your PP goes up. In order to compensate, I had to reduce the HP to keep the car within my 500pp limit. Got it?

You have a point about car age and it might be interesting to run the test again with cars of similar vintage to find out if a super car like GT-R is still faster than a modded sports car like a late model RX-8. Typically I like to run older cars that people don't normally pick so I wanted to see if they could keep up on the track...unfortunately they cannot as they stand now.

However this test as it stands still has some merit in my book. The driver (me) and performance points is the same yet times varied by 4 seconds on solid clean laps. Could I have run faster laps? Absolutely...but I ran roughly the same number of laps in each car so if I were to push one car for a better lap I'd have to push them all. There are probably ways to speed up the two tuned cars via suspension tweaks and proper selection of mods to maximize torque and hp. However it will take hours of work to match what the GT-R does off the assembly line. Plus, it was so much easier to run a clean line in the GT-R than the other two cars.

The only downside I see with running the GT-R is that it won't have much passing power in a 500pp race. As I mentioned above you can floor it around a lot of turns if you hit the apex right. If you're following someone who has to brake it'll be tough to get around them. Once you lose momentum the rest of your lap will suffer.
 
Car 2: '90 Mazda RX-7 GT-X (FC)
Weight: 1060 kg / 1060 kg
Power: 320 hp / 241 hp

Car 3: '09 Nissan GT-R SpecV (GT Academy Version)
Weight: 1680 kg / 1753 kg
Power: 329 hp / 240 hp


Trial Mountain Circuit:
Car 2: 1:36.571 / 1:33.810
Car 3: 1:34.798 / 1:32.991

Suzaka (full course):
Car 2: 2:19.415 / 2:18.345
Car 3: 2:18.008 / 2:20.505


Sorry to burst your bubble.. you either.. can't drive or you.. can't drive.

There is no way in hell a 1600kg GTR with 329hp runs faster than a RX7(FC) with 320hp. I don't care if it's AWD.. that's an extra 1,000lbs.
 
Sorry to burst your bubble.. you either.. can't drive or you.. can't drive.

There is no way in hell a 1600kg GTR with 329hp runs faster than a RX7(FC) with 320hp. I don't care if it's AWD.. that's an extra 1,000lbs.

GTR is faster than a Ferrari 458 around the ring in real life.

GTR having like a 100hp and 350kg disadvantage.

And don't get me wrong, I hate the GTR with passion, It's the noobs car, but facts are facts, and that car is ridicoulously fast.
 
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I don't claim to be an expert driver, but I do run consistent laps. The GTR just sticks to the road like glue. The RX-7 has room for improvement but it simply doesn't have the downforce to make the most out of the tires. I'm sure if I installed a wing the time would improve. In fact, I've already been messing with camber and my times are showing improvement.

I just tried out a 500pp '02 Mazda Protege to see how a FF would fare. Trial Mtn lap time was 1:33.254 on racing soft tires. Then I switched back to the GT-R. I realized Traction Control was set to 5 (default) so I turned that off and ran a 1:31.519 after 4 laps. Next I ran about 10-15 laps in the RX-7. Tuned the suspension some more dropped the tranny top speed to 137 (was at 149, tried 130 but hit the rev limiter). The best I could do was 1:32.646. I love the '90 RX-7 but it just can't keep the pace of the GT-R. Then I pulled out a '95 RX-7 Type RZ tuned up to 500pp. 271hp, 1250kg, 225 ft-lbs. Best time after 10 laps was a 1:31.952. Its closer, but I was working the RX-7 much harder than the GT-R to get that time. Finally I pulled out an '07 RX-8 Type S and broke the GT-R's record with a 1:30.083. The RX-8 was heavy enough to take a few turns WOT just like the GT-R. It had the speed advantage but a slight tap of the brakes was required on a couple turns to eliminate understeer.

Anyway, if you can find a RX-7 tuning that will allow you to run faster laps on Trial Mtn than the GT-R please share.

As for me, I think I've learned my lesson with weight reduction...it is useless unless you can add downforce to compensate. Otherwise you can't get the most out of the tires.
 
As for me, I think I've learned my lesson with weight reduction...it is useless unless you can add downforce to compensate. Otherwise you can't get the most out of the tires.

That's an interesting find!
 
The GTR is fast, but also understeers a fair bit, different driving styles will come into play here as it did in Prologue. Some people were way faster than me on the same PP in harder to drive cars

How you balance the PP will depend on the track and your personal preference, but once you have live opponents the game changes.
Time trials are not the same as racing. It's much easier to keep someone behind you on the turns than on the straights
 
I think your biggest problem is you didn't tune your older cars at all. The PP system doesn't take into account if you have advanced suspension. It assumes you have already got that plus set it right for you. Neither does getting an adjustable LSD effect the your PP number. And lastly some stock cars really need some rear downforce at high speed, or it will handle like a much worse car. They don't need much but like a 10 downforce in the back and boom they are racing to their full potential.

Because of this, I don't believe the PP system will ever work for people that like to keep their cars stock.
 
I think your biggest problem is you didn't tune your older cars at all. The PP system doesn't take into account if you have advanced suspension. It assumes you have already got that plus set it right for you. Neither does getting an adjustable LSD effect the your PP number. And lastly some stock cars really need some rear downforce at high speed, or it will handle like a much worse car. They don't need much but like a 10 downforce in the back and boom they are racing to their full potential.

Because of this, I don't believe the PP system will ever work for people that like to keep their cars stock.
I didn't specify in the first post (thought it was assumed) but they are all tuned. All have fully adjustable suspension and LSD except the GT-R which is bone stock aside from tires. I used the GT5 quick tuning spreadsheet (see the tuning forum) and then fine tuned things from there to get the right feel. For the '90 RX-7 I also tried a setup from gt5-tuning.com but it wasn't any quicker. The MR2 had a wing, the RX-7s and RX-8 did not. I don't like the look of the wing so i only put it on when absolutely necessary. They all ran stiff enough suspensions to accommodate racing tires and had about 0.5 camber on average. The heavier RX-8 might have faired better with more camber because it has more weight to throw around but I didn't bother to run additional laps once i beat the GT-R time.

I raced online last night in a few 500pp pub rooms with the '90 RX-7. In room 1 I was quick enough to secure the poll position on autumn ring, trial mtn, and trial mtn reverse. There were a few GT-Rs in the room that were not racing clean but when the race started i was able to avoid any turn 1 carnage and pulled away to a safe 2-3 second lead. By lap 2 the only car keeping up with me in this room was a Focus RS (non-WRC).

Then I found another room that had boost-low, sport-soft tires, and 500pp. The tracks were laguna seca, cape ring (full), and suzaka east. It was me and an S2000 with a wing. On Laguna the car was loose. I could easily lose the back end on the elbo before the uphill and I couldn't use any throttle on the cork screw. The sweeping left hander after the cork screw turned into a controlled drift. I won the race with some safe driving and blocking but it was clear the S2000 had more grip on the turns. For Laguna on sport soft tires, i will definitely need a wing. Cape ring was a little better but the rear outside tire cooked on the ring and I couldn't catch it. On the last lap, the S2000 did the same thing and I won the race. For Suzaka East, a Lotus joined us. Both the S2000 and Lotus were quicker through the sweeping esses. I just couldn't run the same speed without understeering. I'm not sure if the wing would help here since it appeared that I needed more front grip to turn in. I'll have to practice that course and see if I can make some suspension tweaks.
 
So with the latest update 1.07, it appears that tire selection is separate from performance points. That basically means you'll have to run racing soft tires in online races unless the lobby restricts tire selection. This doesn't affect my conclusions at Trial Mountain and other tight courses since I already proved that you were better off with racing soft tires. However my conclusions at Suzaka are pretty much null and void since I can now run the GT-R with more power AND racing soft tires.
 
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