the NEED for power to weight ratio limit (crazy close lap times)

[Voodoovaj]

What you are looking at is four times, from four different setups, testing PP combined with a power to weight limit. I tuned each of these cars as described below. I just ran three laps to see what would happen. (all cars were on SS tires.)

In this case 550pp limit and 3.00kg/hp

The top time, 1:14:266 is the Subaru VIZIV VGT set to 550pp and 3.34hp/kg (I set the downforce to default, then tuned it)

Time 2 is the VW VGT at 550pp and 3.4hp/kg (fully tuned to my liking)

Time 3 is the Subaru VIZIV VGT set to the 3.00kg/hp limit (I turned the downforce to a minimum for this particular test) This was in the 560pp range though, but it was my first hunch that this could work.

Time 4 is the new Mini VGT set at 520pp 3.00hp/kg

Now, granted, I didn't do a ton of laps but I was just shocked at how close each car was within a three lap test.

Now, if this isn't some kind of indicator that a power/weight limiter would be an great way way to balance out the PP system, I don't know what is.

 

[rams1de]

We've tried this a number of times at our club. It helps get more cars closer to equal times than PP alone but still throws up lots of inequalities.

Currently running a Honda S2000 championship limited to 300bhp, 470pp, 1100kg open to all S2000 variants. Had to allow drivers to swap out of the 06 premium because it was near enough 1 second per lap slower than the standards at exact same spec.

 

[helseth]

Doesn't explain why a Honda Civic with 299 bhp, 1200 kg weight is outpaced by a Honda NSX with 236 HP by more than 2.5 secs and by 1 sec + by a Renault Megane at 260 bhp at midfield. All cars at 450 pp and 1200 kg weight.

Done similar with min weight 1400-1500 kg and max 500-530 pp. One car can have 50-60 bhp more and still be 2 secs slower than another with the same weight and distribution.

Weight to power is just a part of what's going on. Tyre width, aero, weight distribution, base of gravity, wheel base, I bet they all have a say in laptimes.

I do my testing at Midfield on SH tyres.

 

[Le_Manuz]

Doesn't explain why a Honda Civic with 299 bhp, 1200 kg weight is outpaced by a Honda NSX with 236 HP by more than 2.5 secs and by 1 sec + by a Renault Megane at 260 bhp at midfield. All cars at 450 pp and 1200 kg weight.

Done similar with min weight 1400-1500 kg and max 500-530 pp. One car can have 50-60 bhp more and still be 2 secs slower than another with the same weight and distribution.

Weight to power is just a part of what's going on. Tyre width, aero, weight distribution, base of gravity, wheel base, I bet they all have a say in laptimes.

I do my testing at Midfield on SH tyres.

maybe you need to compare what comparable ^-^
FF against MR ..
and what's your megane one ? the regular FF ? the MR Megane Trophy ?
PP values are Dumb
Power/weight is better but depend of the track and the car
you can have two cars with same regulations and all what you want the same but one will be faster
just compare all the NSX if you want to and you'll see

P/W is good when the track is really mixed of curves and straight
but as soon as the ration is in favor of straight speed, then more power with a worse P/W will win

 

[helseth]

The Megane is FF (no Trophy). I have compared about 100 + cars on Midfield and have about 40 cars tuned to 450 pp and 1200 kg. The fastest is NOT the car with the highest hp. My Honda Integra R is 2-3 secs faster than the Civic and still the Civic has way more HP and both are FWD. The Integra is within 0.1 secs to the NSX.

On 530 PP and 1500 kg the story repeats, but with different cars. FWD is useless above 300 BHP because of lacking front wheel traction. Camaro SS is a good 3 secs faster than the AMG C63. Same weight, distribution and the AMG has the most power.

Another example: The Ruf BTR 86 will never be as fast as the other Rufs. All at same weight and PP the 86 has the most BHP, but the slowest speed.

Hence: Theory busted.

Haven't seen any code, but I guess every car has a grip factor besides what we see on screen.

 

[Johnnypenso]

snip...

Hence: Theory busted.

Haven't seen any code, but I guess every car has a grip factor besides what we see on screen.

The grip factor is where PP falls apart IMO. The PP system dramatically undervalues grip and overvalues HP/Torque. It seems to me that all of the fastest cars on any circuit on any tire are always at the upper end of grip and all the slowest cars are at the lower end of grip. When that high grip is combined with peaky power and good rotation, you've got a winner just about every time.

 

[eran0004]

The grip factor is where PP falls apart IMO. The PP system dramatically undervalues grip and overvalues HP/Torque. It seems to me that all of the fastest cars on any circuit on any tire are always at the upper end of grip and all the slowest cars are at the lower end of grip. When that high grip is combined with peaky power and good rotation, you've got a winner just about every time.

To a certain limit. At high PP values you get more points for grip than power. It would be interesting to see the actual PP formula.