League BoP Thread

[Daunt]

Thread for talking about our battle for balancing new cars into the GT3. Will be a fun challenge bringing in the two beasts to GT3, something that will make racing very exciting, I'm sure of.

From the looks of it, we're able to add up to 551 lbs of weight to the cars. I am not sure but I doubt it can be a negative number. Would have to ask iRacing if it is possible to reduce weights as well.

I've been seaching on the forums or whatever to see if this has been attempted and it seems it has (I imagined it had). They said weight is not enough to balance the Corvette (haven't found anything on the Caddy). Here's a quote from a very relevant thread, including someone saying it has been tried:

Iracing corvette(GT1) : 590 hp for 2275 lbs

Fia Balance of performance rules : Corvette Z06 Gt3 : 2800 lbs and 540 hp (close to mclaren specs)

Here's the thread: http://members.iracing.com/jforum/posts/list/125/3208362.page#7819475

Here's another very interesting overview of the topic. This is a bit of an older post but it is still obviously relevant. Basically goes to show that we'll need to more than slap weight on.

For some of the posts above, I can try to give an educated answer on why it couldn't work in a race, to balance a Corvette GT1 HP + weight to match a GT3/GT2 pace

The Corvette would still have much more effective downforce, braking and grip
so, to balance it and result in the same laptime than the McLaren for example,
it would have to be slower in the straights, and then you finish with the mess that we had at the end of S4/12 in the GT Challenge where the old Ford was faster on straights, slower on brake/cornering than the 12C for the same lap time

For a quali it's allright, for a race it's terrible.

To make it works not only HP and weight on such different regs cars have to be changed but also aero and key parts like braking material and assistance (braking, as they're all suppose to have TC already), and tires size.

I'm one of those that is really missing a proper "GTR2 grid" with all those different cars (Le Mans syndrom)
but if it's not made properly, it will be 2 or 3 days before only one of the car be populated. I4m really willing to lobby a bit when the Z4 is about to come so it's not messed. So much potential on multicar in official series, they better get it right before it's released.

Thread: http://members.iracing.com/jforum/posts/list/100/3208768.page#7334815

Not saying it cannot be done. Nothing more I'd like to try and do. But we'll definitely need all the help we can get, especially from iRacing. I think, as we talked about last night, that means fixed series is a must.

 

[Daunt]

Also this:

Yeah caddy is an extra heavy car......

Iracing GT cars Power/ Weight (P/W)ratio:

Ford GT : 500 bhp / 2775 lb = 0.180
Mc Laren: 493 bhp / 2723 lb = 0.181
Corvette: 590 bhp / 2425 lb = 0.243
Caddy: 460 bhp / 3200 lb = 0.143
and

RuF : 500 bhp / 2645.5 lb = 0.189 (if 911 gt3 spec)

So actually the fastest cars should be in order:

Corvette (0.243)
Mc Laren (0.181)
Ford GT (0.243)
Caddy (0.123)

Verification with best laptime in race on the same track (in 2013):



Zolder:

Corvette: 1:25.199
Mc Laren 1:28.733
FordGT: 1:30.115
Caddy: 1:30.860


Okayama:

Corvette :1:24.381
McLaren: 1:27.822
Caddy : 1:28.797
Ford GT : 1:29.209

Autodromo José Carlos:

Corvette :1:28.063
McLaren: 1:32.117
Ford GT : 1:33.097
Caddy : 1:34.169


Brands Hatch:

Corvette :1:20.285
McLaren: 1:23.560
Ford GT : 1:24.815
Caddy : 1:25.723

Mid Ohio:

Corvette :1:17.212
McLaren: 1:20.675
Ford GT : 1:21.727
Caddy : 1:21.679

Laguna Seca:

Corvette :1:18.051
McLaren: 1:21.706
Caddy : 1:22.495
Ford GT : 1:22.772

We can see the corvette is far away from the others as expected but the caddi is very close to Ford GT despite his Weight and Power. These 2 cars are almost balanced

.

Thread: http://members.iracing.com/jforum/posts/list/125/3208768.page#7414783

 

[Daunt]

Also to add more info to attempts:
The (very popular) ESRA GT Masters have attempted many BoP to Cadillac, non-GT3 Ruf (at the time), Corvette, etc. Here's a thread from 2014 regarding their season, testing, etc:

http://members.iracing.com/jforum/posts/list/3215241.page

The OP has many testing / results from sessions and races.