JTM Skunk Works LTM

Era (Year/Decade)
Road Car Class (Compact/Full Size/ Door)
Race Car Class (Race division, Class, Possible Class)
Displacement (Engine CC)
Drive Line (4WD, FR, FF, MR, RR)​

The first test was be to determine if two cars of different era’s different drive train with in the same class are tuned the same way will they be able to compete. You can find the results here as the photo’s states time along with a file containing the GT5 DATA Log file that can be viewed in GT5.


The current cars that are being tested have full weight reduction, full Air, full exhaust, racing tires, racing suspicion, stage one motor mod. No turbo's or superchargers have been added.

(Addition 12:40 pm 2/04/2013)

It has been clearly confirmed that the new pp system classes cars in a era format. Even though some cars will be similar in pp number after full break in their over all performance have differ greatly. A chart is being worked on to explain in detail.

Test Tracks are Fuji Speed Way F, Nurburgring GP/D and Grand Valley Speed Way; these are the same tracks for the exception of that were used to test the cars that drivers were entering in the World GT Challenge. Drivers pushed their cars not knowing they were running against a predetermined time, the time was a result of 15 different times that were set but 15 drivers all with different skills sets. From those times an average was resolved for the performance test. The cars were so close to each other you had .1000 of a second between each car in class. (Driving every car with some error involved) The same tuning method will be used to tune, only the parts necessary for optimal performance.

All street cars will be tune to class will running at 100% power, no de-tuning involved. Testing found de-tuning below 85% the car (s) will start to lose a great deal of performance out of the motor which is the key factor. Even though the current tuning method used compensates for that flaw, that lack of performance. With the 2.10 update the drive train is now another key factor with tuning. As stated before all cars will be build within the limits of class.

Two cars will be matched against each other of any drive train to show the difference in times and performance if any. Cars will be test Thursdays and Fridays, if any wish to be involved in the testing look for lobby title “JTM SKUNK WORKS” on one of the tracks listed above. Test regulations will be listed along with car information. Any person found to be outside regulations will be removed from the lobby.


Chevrolet Corvette Z06 (C6) '06
651hp/7000rpm 547ft-lb/5700rpm
1178kg PW/R 1.78kg/hp
FR Full size 2dr coupe Sport Car PP575
Medium race tires/Test

Audi R8 4.2 FSI R Tronic '07
549hp/8200rpm 384ft-lb/5700rpm
1264kg PW/R 2.26kg/hp
4WD Full size 2dr coupe Sport Car PP 576
Medium race tires/Test

(Log 01-04:30)

The Audi R8 and the Chevrolet Corvette are only one pint apart though the horse power, torque, power to weight ratio numbers are off they are still within one of each other. The factor that comes into play is the drive train. The R8 will be able to put the power down faster than the Corvette though the Corvette will catch the R8 down the straight do to the limitations of the 4WD drive train which slows at higher speeds due to the weight of the drive train. A driver that known’s how to set a 4WD properly will be able to overcome this limitation.

(Log-02/16:03 2/7/2013)

After looking at the Performance Points chart developed from test the 2.09 update. The R8 which sits at 576pp, the Corvette is at 575pp both are in the group number of 568/576 PP. More than likely MR, RR drive trains will be lower numbers of that group. Even though the number seem to far apart there not, if you look at the chart you’ll notice a notation stating the common number is 8. This also factors in aero, surprisingly adding aero lowers the PP number to differ for the common use of the aero.
Adjusting the aero will allow a variation of down force ranging from 1 to 7 points. This adjustment will be tested at a later time to see if any change has accorded in this area.

(Log-03/19:45 2/7/2013)

Nurburgring GP/D times for the R8 1:28.552 race medium tires. 1:28.239 for the Corvette with race medium tires, both car are capable of achieving low 1:27’s with a well balanced setup.

(Log-04/21:21/2/7/2013)

Audi R8 performed better that the Corvette at Fuji. Achieved time in the R8 1:40.405, Corvette 1:41.175, times taken from race conditions.

(Addition)
Noticed that the Corvette and the R8 gained hours power and 1 pp point after 240 miles of racing. Break in is still proceeding.

(Log-05 20:44-2/7/2013)

During testing it was found that the Z06 was a better handling car than the R8 in though the Audi did very well. The best time around Nurburgring GP/D for the Corvette 1:28.017, R8 1:28.414 with a 0.397 gap between them which is a lot over a race. Though it can be overcome though a well round set.

Data replays included in zip.
View attachment AudiR8-CorvetteZ06 replay.zip

All race cars within a series will be tested with a stock fully broken in motor within their decade to determine how equal the cars are. Single races will be matched up against the current TC and RM cars with motors build to stage 1, excluding the Corvettes which will retain the stock motor with no motor modifications. Even though the down force number will differ the main number along with the max down will be the power to weight ratio number. All cars will be run at 100% power and will go under a 30 lap sprint race to compile data on tire duration, fuel along with times. Hard and medium tire will be used only while testing the race cars.

Hard tires will be tested for 25 lap duration; the remaining laps will be performed on mediums to factor fuel burn off to speed.

This week’s cars for the Race Car Challenge are the Corvette Z06 RM and the Citroën GT race car, both cars were bought new to see if there were any changes if any. While the cars are broken in both will be tested to see the flaws and avenges they will have. Final numbers will be given after break in.

It’s time for the CAKE, the JTM MAG/TOP GEAR Challenge.

We’ll be going through car magazines to find cars within GT5 and attempt to build them to their real world counterpart to see how close the numbers really are. As for the TOP GEAR portion of the challenge, we’ll be going through the TOP GEAR archive to obtain all times set on the TOP GEAR track. As we go through the archives we’ll also be going through the GTP members list to pick two random members to compete in the challenge. Both drives will be required to give their opinion on the cars and handling.

The first MAG challenge is being looked over, the TOP GEAR Challenge cars will be shared at a later time.

7 cars have been found for the MAG Challenge.

As they call it Lucky number “7” though as was looking through my favorite auto magazines I came across total of 20 cars for the FIRST mag challenge, but first let me share with you what I found very interesting. Going through the first few issues of a magazine that I’ll title “MT” I came across the first to car for the MAG challenge. The beast of the bulls in GT5, AVENTADOR LP 700-4 2011/2012 which seats at 690hp/8250rpm 509.19ft-lb/5500rpm. MT has the 700-4 rated at 691hp/509ft-lb. Here are some photo’s to share what I found, surprising. With this I believe the Performance Points system is almost done, even though this is just one car it’s the first of many to be compared.


Note some cars will be broken in with no oil change to see how close the numbers are and other will be tuned to or close to without being detuned. Now to the cars, let continue with MT.
(MT)

Lamborghini Aventador LP 700-4 2011/2012

McLaren 12C Spider

“The best designed Corvette in 60 years”
Chevrolet Corvette Sting Ray 2014

(2014 Proto Type will be used)

(SS)

“The GREAT Lizard from the East”.
Nissan R35 GT-R

Another great from the East for being one of the most sought after cars for drifting.

Nissan 240SX 1991
(DS)

G35

EVOX

Nissan 350Z 2008

(IT)

15 Time Attack car
s
Honda S2000 ’00,’01,’04,’07

(S2000 ’06 will be used)

Toyota Supra Turbo ‘94

(Toyota Supra SZ-R ’97 will be used)

Mazda RX-8 ‘03

Mazda RX-7 ‘87

(Mazda RX-7 ’85 will be used)

Nissan 240SX ’91,’93

(Nissan Silvia K ’93 will be used)

Nissan 350Z ’03,’06,’08

(Nissan 350Z ’07 will be used)

Nissan 370Z ‘10

(Fair Lady Z will be used)

Datsun 280Z ‘75

(Datsun 280Z ’78 will be used)

Scion FR-S ‘13

(Scion FR-S ’12 will be used)

Each car will be broken in before any tuning parts are added to log all numbers. As the cars got through a step tuned hp/ft-lb/weight and pp will be logged for each install to see what are advantages and disadvantages of that part. As testing goes on tunes and information will be posted.

With so much going on within JTM SKUNK WORKS it may take some time to release information pertaining to the projects, though it will not slow down the work. The last two, most important projects is the classifications of the World GT Challenge series and the development of the CUP cars, CUP cars are road based cars that have been tuned for a performance class. Now this can be one make or classes or sires that follow some of the major sport car racing divisions. The CUP cars will be classed in two with four groups in those classes for testing. All the cars in each class will have stage one engine modifications, full air and exhaust parts installed for optimal performance. The first class will be classified C03, this class will not have any rear aero parts added to the cars. The second class will be classified F74, this cars will have rear aero parts installed, the cars will be build with weight reduction in stages to see what will be the possibilities will be.

This will be the only time the power limiter will be used to reduce the power if needed to get the CUP cars close, weight will be added as well in need. The current CUP car in development is a Ferrari 430 Scuderia ’07 (F74), current numbers 615hp/9200rpm 392ft-lb/Power to Weight Ratio 1.96kg/hp, current pp with now changes 592pp.

The Aventador weights at 1575kg 3472lbs in GT5, its real world counter weights 4100lb which is 1859kg. A difference 284kg and 628lb which is way too much at this point, though power and torque numbers are very close.

Ferrari F430 Scuderia Cup Car; Nurburgring GP/D​

Currently able to achieve consistent 1:28’s with this set. As the power increases the set may be changed.

The car has good turn in and it able to put the power down coming out of the corners, though if you come on throttle to hard in the power band the car will come around more so come on to the straight; other areas of the track car very stable in transitions, very predictable under heavy breaking.

This set for the GT-R is well balanced and will get you consistent 1:38’s on mediums tires as long your nice to them. You must set the individual gears, once set move final gear to 211, this gear set is still under testing. Final gear set will be available at a later time.

I was asked to explain the Performance Points chart that I developed when trying to break down the Performance Points System.

The Performance Points chart is basically a mathematical grouping chart similar to a mathematical hundredths chart though with limitations unlike the mathematical chart. The math chart can always start over the Performance Points Chart stops once it stops. The reason why it stops is due to the limitations of the Performance Points System. The Performance Points System was developed to judge/ predict the performance of any given automobile on a mathematical equation. This equation will also have limitations factored in so it can properly judge/predict the performance of any given automobile at even given state in development or at its final thresh hold in performance. It’s also too able to determine where each automobile performance will be once it has been modified. As in removing weight and adding power which will alter the performance of the vehicle which in turn increasing the performance of the car raising the performance points number within a group.

Every car has a starting pp number or group number before you put it on the track, once you put miles on that car the pp number will raise again along with the group number. Here is a build sheet of a 430 CUP car in development. It will show you the dealer’s car pp number, power, torque and group number, followed by garage numbers. Final build will be the CUP build, this area will show the being number pp and group number followed by the step build, showing parts effects and increased pp number. At the end of each group build meaning power and weight it will show lose of weight, power increase, new pp and group numbers, final part of the build will be the aero. Which will show being pp number before break and after break in along with the pp range that can be changed with the movement of the wing, if you take the being pp number and the ending pp number of the wing movement subtract them you’ll get the number 7, which gives you seven point’s to play with. If you look at the 2.09 PP chart is shows that the common is 8.


You'll notice that the car moved up two groups during the build.

Now that pp has changed a few new equations have been added. Equations that factor in decade, class of car, displacement and drive train and drive train weakness. That changing how the cars will reacts to tuning/ modifications.

FR-S set removed being reworked.

Updated chart available.