Here's the wrap up on my all day test session which kind of lead to me missing Fugi tonight, but I took one for the team!
Ford Falcon @ 324hp|1360kg - This car is the fastest car on track by 1 mph. If you reduce 10kg it falls short to the 3rd fastest car pp restricted @ 525 to make sure no downforce over 20/50
Nissan Silvia @ 324hp|1160kg - 2nd fastest all around car both this car and Falcon launch harder than awd Mazda, and is the bench mark for all chassis racing.
Lexus Altezza @ 324hp|1160kg - Equal to Silvia perfect match
Lexus IS200 @ 324hp|1160kg - Equal to Silvia perfect match
Bmw 330i @ 354hp|1140kg - 2nd fastest car by mph, but very slow out of the gate and build up of mph, but It will run you down. I would of added extra 10hp but this car is pretty much maxed out @ 355hp and lowest weight of 1140kg made the whole packs weight be based of this mark.
Mazda/Atenza @ 334hp|1140kg - 3rd fastest car by mph but equal out of the gate to a FR car even-tho its awd. This car will run you down, but is very equal to Silvia, Altezza, and IS200.
Odd balls:
HKS Evo @ 344hp|1140kg - This car is a beast out of the gate because of its 481ft/lbs of torque It will make you feel like it can't be caught, until you catch it because it falls short to lack of mph. At least 4 to 6 mph. Any chassis can chase this car down, and if your using this car you will need to draft to stay with the pack.
Subaru TC @ 344hp|1140kg - Equal to HKS Evo, but launches a bumper ahead, and falls back about a bumper to the HKS Evo on the top end. It comes up short a mph or two to the HKS Evo's mph, but is pretty much equal to the Evo.
AEM S2000 @ 334hp|1160kg - Faster of the two S2000, but handles like s*#%. This FR car accelerates harder than the top four FR chassis almost like an awd drive, but once again comes up short on the mph. It can be ran down!
Amuse S2000 GT1 @ 324hp|1140kg - accelerates slightly better than the AEM S2000 and handles way better, but falls short to the AEM S2000 top speed which is already around the awd's mph rate. Low to mid 160mph'
Honda Touring Car @ 364hp|1080kg - Has trouble getting speed to the wheels so makes it slow off the line, but once it whines up it can catch the Silvia if not the Mazda's. I ran 10kg lower to compensate for front wheel drive.
All other cars need to be broken in so no test data for them. I take it that the Civic Rm & Golf Rm will have really low kg, with maybe slightly more hp like 374hp since the downforce rating is 15/35. People who run these chassis watch out for getting rammed off the track due to the fact that your corner speed will be slow, but you'll have enough compensated hp to keep blocking into the next turn.
I setup all cars so that any one car regardless of their advantages/disadvantages can draft and sling shot all other chassis if in drafting position. Top mph in full draft pull would be around 180-185mph to be safe. Monza, Indy, Le Mans, Fuji, Hi Speed Ring, Grand Valley, Spa, Daytona Road (especially), and maybe SSR5 could see such mph's.
Overall heavy hitter of the night goes to the V8 Supercar Ford Falcon with only 324hp and 1360kg's of weight was still the fastest car on grid and launch with pull like an awd car. Room stewards beware that even at the pp restriction for this car a person could still add to clicks of downforce to the front or back before it violates it pp limit.
Btw big thumbs up for switching Tsukuba for Mazda all day!