Season 18 Trans Am Master Car List

Group 12a

   

Copper	Bronze	Silver	Gold	Platinum
1970 Corvette	1970 Corvette	1970 Corvette	1970 Corvette	1970 Corvette
P.I. S763	P.I. S760	P.I. S747	P.I. S740	P.I. S728
653hp/653tq	653hp/653tq	653hp/653tq	653hp/653tq	653hp/653tq
2465lbs	2517lbs	2465lbs	2510lbs	2465lbs
6.2L V8	same	same	same	same
Twin turbo	same	same	same	same
Race airfilter	same	same	same	same
Sport fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Race valves	same	same	same	same
Race engine block	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	265/55R15 - 335/45R15	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
remove rear bumper	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
1992 Honda NSX-R	1992 Honda NSX-R	1992 Honda NSX-R	1992 Honda NSX-R	1992 Honda NSX-R
P.I. S758	P.I. S755	P.I. S742	P.I. S734	P.I. S724
429hp/321tq	429hp/321tq	429hp/321tq	429hp/321tq	429hp/321tq
2264lbs	2302lbs	2264lbs	2293lbs	2264lbs
Race airfilter	same	same	same	same
Race fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Sport cam	same	same	same	same
Sport valves	same	same	same	same
Sport engine block	same	same	same	same
Race pistons	same	same	same	same
Sport oil cooler	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	245/40R15 - 295/40R16	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
2004 Porsche 911	2004 Porsche 911	2004 Porsche 911	2004 Porsche 911	2004 Porsche 911
P.I. S767	P.I. S763	P.I. S750	P.I. S743	P.I. S733
450hp/335tq	450hp/335tq	450hp/335tq	450hp/335tq	450hp/335tq
2709lbs	2757lbs	2709lbs	2750lbs	2709lbs
Race airfilter	same	same	same	same
Race intake	same	same	same	same
Race fuel system	same	same	same	same
Race ignition	same	same	same	same
Race valves	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	255/35R17 - 305/35R18	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
2013 SRT Viper GTS	2013 SRT Viper GTS	2013 SRT Viper GTS	2013 SRT Viper GTS	2013 SRT Viper GTS
S766	P.I. S762	P.I. S750	P.I. S743	S733
640hp/600tq	640hp/600tq	640hp/600tq	640hp/600tq	640hp/600tq
3205lbs	3263lbs	3205lbs	3256lbs	3205lbs
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Stock tire compound
Widest tires	Widest tires	Widest tires	295/30R18 - 355/30R19	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
2015 Mercedes-AMG	2015 Mercedes-AMG	2015 Mercedes-AMG	2015 Mercedes-AMG	2015 Mercedes-AMG
P.I. S778	P.I. S774	P.I. S762	P.I. S755	P.I. S745
559hp/532tq	559hp/532tq	559hp/532tq	559hp/532tq	559hp/532tq
2936lbs	2992lbs	2936lbs	2985lbs	2936lbs
Race airfilter	same	same	same	same
Race exhaust	same	same	same	same
Race valves	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	275/35R19 - 335/25R20	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same

Group 6

  

Copper	Bronze	Silver	Gold	Platinum
1967 Corvette	1967 Corvette	1967 Corvette	1967 Corvette	1967 Corvette
P.I. S766	P.I. S763	P.I. S750	P.I. S744	P.I. S732
634hp/634tq	634hp/634tq	634hp/634tq	634hp/634tq	634hp/634tq
2303lbs	2347lbs	2303lbs	2340lbs	2303lbs
6.2L V8	same	same	same	same
Twin turbo	same	same	same	same
Race airfilter	same	same	same	same
Street fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Race valves	same	same	same	same
Race engine block	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Street roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	265/55R15 - 335/45R15	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
1969 Mustang	1969 Mustang	1969 Mustang	1969 Mustang	1969 Mustang
P.I. S760	P.I. S756	P.I. S743	P.I. S737	P.I. S726
633hp/530tq	633hp/530tq	633hp/530tq	633hp/530tq	633hp/530tq
2577lbs	2630lbs	2577lbs	2623lbs	2577lbs
6.2L V8	same	same	same	same
Race airfilter	same	same	same	same
Race fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Race cam	same	same	same	same
Race valves	same	same	same	same
Race engine block	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	265/50R15 - 335/40R15	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
1970 Challenger	1970 Challenger	1970 Challenger	1970 Challenger	1970 Challenger
P.I. S762	P.I. S759	P.I. S745	P.I. S739	P.I. S727
705hp/664tq	705hp/664tq	705hp/664tq	705hp/664tq	705hp/664tq
2734lbs	2786lbs	2734lbs	2780lbs	2734lbs
6.2L V8	same	same	same	same
Twin turbo	same	same	same	same
Race airfilter	same	same	same	same
Race fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Street cam	same	same	same	same
Race valves	same	same	same	same
Race engine block	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	265/50R15 - 335/40R15	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
1995 Mustang SVT	1995 Mustang SVT	1995 Mustang SVT	1995 Mustang SVT	1995 Mustang SVT
P.I. S761	P.I. S757	P.I. S745	P.I. S738	P.I. S727
636hp/636tq	636hp/636tq	636hp/636tq	636hp/636tq	636hp/636tq
2606lbs	2660lbs	2606lbs	2653lbs	2606lbs
6.2L V8	same	same	same	same
Supercharger	same	same	same	same
Race airfilter	same	same	same	same
Race fuel system	same	same	same	same
Race ignition	same	same	same	same
Race exhaust	same	same	same	same
Race valves	same	same	same	same
Race engine block	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Sport roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	265/45R17 - 335/35R17	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same
Copper	Bronze	Silver	Gold	Platinum
2002 Camaro	2002 Camaro	2002 Camaro	2002 Camaro	2002 Camaro
P.I. S761	P.I. S757	P.I. S744	P.I. S737	P.I. S727
478hp/478tq	478hp/478tq	478hp/478tq	478hp/478tq	478hp/478tq
2765lbs	2818lbs	2765lbs	2811lbs	2765lbs
6.2L V8
Race airfilter	same	same	same	same
Race intake manifold	same	same	same	same
Race exhaust	same	same	same	same
Race valves	same	same	same	same
Race pistons	same	same	same	same
Race flywheel	same	same	same	same
Race brakes	same	same	same	same
Race suspension	same	same	same	same
Race anti-roll bars	same	same	same	same
Race roll cage	same	same	same	same
Race weight reduction	same	same	same	same
Race clutch	same	same	same	same
Race transmission	same	same	same	same
Race driveline	same	same	same	same
Race differential	same	same	same	same
Race  tire compound	Race  tire compound	Sport tire compound	Sport tire compound	Street tire compound
Widest tires	Widest tires	Widest tires	275/40R17 - 335/35R17	Widest tires
Lightest wheels	Heaviest wheels	Lightest wheels	Heaviest wheels	Lightest wheels
Forza downforce F/R	same	same	same	same

FYIA, double check your NSX and 70 Vette builds in case you didn't see the corrections

GTDon2 wrote:FYIA, double check your NSX and 70 Vette builds in case you didn't see the corrections

Please, again, double check the builds on these two cars.  We've changed them ever so slightly twice now.  This is not to suggest that we did not change the other cars from their Season 17 builds, we have changed all of them.  It's just that recently we have changed the 70 Vette and the NSX twice since we published the Season 18 build sheets.

You may ask why this is?  Why would they need to be changed at this point?  Didn't you guys test them?  

The answer is, yes, we did test them but there are several factors that effect their ultimate BoP in the process.  One is that the testers actually get better with the cars as testing goes on, and not all testers are equally good with each car.  The other is, testing is done at a generic level which is not quite the same as racing due to time constraints.  We can't tune every car as if we were racing them.  

So, after we do hundreds of laps on all the tracks with all the cars and get them balanced, we go back and do a fine tuning spot check for outliers.  Then, once satisfied, we publish the build sheets.  Then, we start doing a racing "surface tune" to see if any of the cars start to "magically" get better while doing direct comparisons of each car at each track.  This usually produces or reveals one or two cars that are still unbalanced.  

So, this is why we have these last minute fine tuning changes.  We are talking on the order of small 1hp and 1lb type changes.  Seemingly insignificant, and this is because the cars are fairly close to begin with, but, they still need to have a slight push away from or toward a more accurate BoP as a result of the surface tuning/comparisons. 

You wouldn't think such small changes would make a difference but on certain cars it does.  Plus, we are trying our best to bring all the cars into a competitive zone that is across all the tracks.  So that a car that we know is somewhat faster at one track is not also dominant at another track. We can't have a car that is naturally great at its "home track" to then allow it to also be really good at the other tracks too.  In other words, if a car is really good at its native track, we pay special attention to how good it can be at its weaker tracks.

We do not anticipate any further changes at this point in time.

100%, dont foresee any

The list is correct as of yesterday.  Sorry I had to delete your copy to keep things clean.

FYI, there are 2 ways to build the Camaro that will give you the correct hp/tq weight and P.I.  This is rare. One is with the stock motor, and the other is with the 6.2L motor without Race engine block.  We feel that the 6.2L is the slightly better build of the two, and is what we have published above for the build sheet on this car.

[quote="GTDon2"]FYIA, double check your NSX and 70 Vette builds in case you didn't see the corrections[/quote]
so the corrections are in this thread

Yes