Thanks for those John. Using the search function 14 tunes came up of which 12 were for the GT40 or GT40 Anniversary, but not the tunes from the two best tuners on GTPlanet - Praiano and Motor City Hami so you will need to go their tuning section and look for the GT40 if you want to try their tunes.
https://www.gtplanet.net/forum/search/2352000/?q=Ford+GT40&t=resource_update&o=relevance&c[rescat]=2
I looked at all the tunes and tried about half a dozen, but noticed that very few are for the car at its minimum weight of 994 kg and near our power level of 310bhp. Those that were developed for PP limited racing generally have ballast and a wing added. The wing is obviously not allowed in our series as it ruins the look of the car and spoils the photos. I could not get any of the GTPlanet tunes to work satisfactorily for my driving style when using SH / SH tyres. I was able to lap 0.8 seconds quicker using the fastest GTPlanet tune compared with using race soft suspension with CS front and SH rear tyres, but it was difficult to stop the back swinging round and the car spinning off four laps out of five!
There is something wrong with the back of this car as implemented by PD. I remembered an interview with Kenny Brack in which he said that the GT40 had a high centre of gravity (presumably because it was designed for the Fairlane based Indy aluminium engine, but was raced with cast iron engines) so I started raising the rear and found that the higher it got, the more controllable the car became. The car lacks mechanical grip at the rear as standard, due presumably to a lack of body roll so I then played with the rear suspension and found that it got better as the suspension became softer. I now have a setup that works for me at 310bhp which is what Silver drivers will be using in the "1967 Sports Car Cup".
Gold / Platinum Drivers don't use the GT40 in that series as they are in either category GT3 (Ferrari 250GT0, Ferrari Dino, Alfa TZ2) or GT5 (Shelby GT350, Corvette C2, Lotus Europa Special). I will be interested to hear from other Silver Drivers such as John Wells, IfAndOr, Bergele etc whether my tune works for them. I don't know if this tune will work for the Gold / Platinum drivers - they use the Ford GT40 in the "1966 Sports Car Cup" at 485bhp when the silver drivers are mostly using the Jaguar XJ13 also they obviously have a different and much faster driving style. I would be interested to hear from @Eran00 and other Gold / Platinum drivers whether they went down a similar path to me in their quest to get some rear end grip from this car and whether my tune works for them.
Oil change, but no body reinforcement. Tyres SH / SH weight 994kg or 1007kg if you want to add front ballast. 519PP or 518PP with ballast.
Suspension - fully adjustable:
Ride height 75 / 95
Spring rate 7.20 / 6.27
Dampers Compression 5 / 1
Dampers Extension 6 / 1
Anti Roll Bar 3 / 1
Camber 0 / 0
Toe - 0.15 / 0.10
Racing Brakes 8 / 7
Transmission - custom tune to suit track and personal preference
Limited Slip Differential 7 / 12 / 18
Power - the limit is 310bhp - tip go for torque then limit power
Body - maximum lightness
Ballast 0 or to preference. I prefer 13kg
Position -50
Note, the room limits for the series are given at the end of post 5 "1967 Three Ten Cup" and at the end of post 6 "1966 Sports Car Cup". Most of the cars cannot reach all the limits stated, but will be lower than one or more of the limits.
1967 Three Ten Cup limits are 310bhp, 560PP, 649kg
1966 Sports Car Cup limits are 485bhp, 581PP, 900kg - note the Chaparral 2D has its own limit because it has better handling than the other cars, but only @John Wells is using this car. Following further testing Johns limit has been increased to 400bhp, 476PP, 900kg to enable him to be more competitive.
