What kind of damage has your tires when you post your best time(Color)

[Nicktune]

What kind of damage has your tires when you post your best time(Color)


I'm doing my best times when my tires are almost done (light red)
It Must Be Caused by the added slip angle!

And you ....

 

[Dan360]

Well, i do 5'25.XXX in the pd f1 car, but with all tryes either red or orange, i was only about 8 seconds of my pace, the only thing i felt was some wheelspin and constantly breaking early.

 

[Austin343]

The tires are best when they're yellow, perhaps starting to turn slightly orange, but it's hard to separate the changing grip of the tires from the decreasing weight of the car as fuel burns away.

 

[Blitz24]

Like Austin said, the tires aren't the main factor in deciding the best time. I can pull off 67 second laps at Laguna Seca on Green/Yellow Tires with 3/4th fuel. I could probably get lower if I had less fuel.

 

[Nicktune]

I was curious about the weight loss from the burning fuel…so I spend 3 hours testing different things!

These results are from acceleration in straight line only-with stock cars.... and with racecars I’m getting to the same conclusion.

Burned fuel VS weight reduction

Honda S2000 Fuel capacity (Gallons) = 13.2

----------------------weight(Lb/Gal)

Petrol Premium unleaded -- 7.4 = 97.68
Premium leaded ---------- 7.3 = 96.36
Racing leaded ----------- 7.3 = 96.36
Racing unleaded --------- 7.5 = 99=45Kg

Full tank = 45 Kg
Weight reduction from stage 1 to 2 = 1165 to 1128 =37Kg
0-400m
There is no difference in speed from a full tank and an empty tank
With weight reduction of 37kg you get only 1 MPH


Impreza STI Fuel capacity (Gallons) = 16.9

Full tank = 57.6kg
Weight reduction from stage 1 to 2 = 1310 to 1267 =43kg
Same as the S2000 There is no difference in speed from a full tank and an empty tank
With weight reduction of 43kg you get only 1 MPH

Same happen with 0-1000m

Conclusion….I think there is no weight loss from a full tank to an empty tank(in the game). Although I might be wrong….

Thanks.

 

[Blitz24]

I was curious about the weight loss from the burning fuel…so I spend 3 hours testing different things!

These results are from acceleration in straight line only-with stock cars.... and with racecars I’m getting to the same conclusion.

Burned fuel VS weight reduction

Honda S2000 Fuel capacity (Gallons) = 13.2

----------------------weight(Lb/Gal)

Petrol Premium unleaded -- 7.4 = 97.68
Premium leaded ---------- 7.3 = 96.36
Racing leaded ----------- 7.3 = 96.36
Racing unleaded --------- 7.5 = 99=45Kg

Full tank = 45 Kg
Weight reduction from stage 1 to 2 = 1165 to 1128 =37Kg
0-400m
There is no difference in speed from a full tank and an empty tank
With weight reduction of 37kg you get only 1 MPH


Impreza STI Fuel capacity (Gallons) = 16.9

Full tank = 57.6kg
Weight reduction from stage 1 to 2 = 1310 to 1267 =43kg
Same as the S2000 There is no difference in speed from a full tank and an empty tank
With weight reduction of 43kg you get only 1 MPH

Same happen with 0-1000m

Conclusion….I think there is no weight loss from a full tank to an empty tank(in the game). Although I might be wrong….

Thanks.

That's not true for race cars though. An F1 car will run faster if there is less weight.

 

[Austin343]

It's true for road cars, too. It's tricky to document, but it's universally considered to exist among those that like to drive full endurance races in A-Spec. Some of the difference in lap times can be explained by extra practice, but there's definitely an improvement in cornering ability with less fuel, and I think that acceleration improves incrementally, although it's possible that that's a function of exiting the corners with more speed.

 

[Parnelli Bone]

I was gonna say. I've noticed a difference in speed when the car I'm racing has a near-empty tank, especially at tracks with long straights (Grand Valley, Nurburgring, Sarthe). In comparison to a full tank, there's usually a 2-3 mph gain in speed at the end of the straight (before braking) if the fuel tank has 3 or less bars of fuel.

On topic: It seems I usually get my best times when the tires are yellow, just before they start going orange and grip/traction starts to fade. I dunno why this is; must be psychological. I noticed in GT1 and 2 I used to get the best laps with green-going-on-yellow tires, instead of yellow-going-orange.

 

[GTsail]

I post my best times with yellow tires. I'm in agreement with Austin343 and Parnelli Bone that most of this is due to the reduced fuel load.

Its my opinion from driving many miles in GT4, that the cars are definitely faster without a full fuel load. Tire wear is also reduced with less fuel.

I have not thought up a conclusive test for this, but something to try would be to have B-spec Bob drive a car from the start until the fuel gauge was reduced by 40 units (from 80 down to 40). And then have Bob pit for tires only. Then have Bob drive off the rest of the fuel (from 40 down to zero) and see how far he goes (overiding the pit-in signal).

I think that this test should be done at a short track like the Beginner Course, but maybe it wouldn't matter.

The results should show that B-spec Bob drove further and faster with the lighter fuel load.

Do you think that this would work?

Respectfully,
GTsail

 

[Austin343]

I'm in agreement with Austin343 and Parnelli Bone that most of this is due to the reduced fuel load.

I actually didn't mean that I think that most of the speed gains are due to fuel; I'm pretty sure that the tires actually offer more grip when yellow than when green (and obviously more than when blue or orange/red), but I don't know how its contribution compares with that of the fuel. Your idea for testing for the role of the fuel would work well, and there's an analogous test for the tires, but it would be painstaking (involving filling the car to different levels in order to get the same fuel load at each point of the wearing of the tires).

Tire wear is also reduced with less fuel.

Many drivers report this, but it's never been true for me. It certainly aligns with real life, but I think that my increased tire wear also has a good explanation: I continue to push the car to its limits (not always wisely ), which are increased as fuel is consumed, and the friction between the tires and the track, which is the force that drives cornering and braking, increases correspondingly. Since the tires are doing more "work," they wear faster. This can also be seen when adding downforce - even though the car slides around a lot less, tire wear worsens because they're exerting the force that gives the car its improved cornering speed.

 

[Nicktune]

Austin343 ---- It's tricky to document--That's true

GTsail290------something to try would be to have B-spec Bob drive a car...-- Good Idea

That's true that the car feels better in corners with an empty tank...I'll try different things with the B-spec

 

[BobK]

In an endurance race I do my best laps when the tires are a bright orange. In fact, more often than not my fastest lap is the last lap before an inlap. It doesn't matter if I took on fuel; the lap before my next inlap will be among my fastest.

However in a 'normal' (non-enduro) race I get my best times on yellow tires; by the time they're the shade of orange that gives me my best enduro times, the grip is noticeably going and the lap times are increasing.

 

[Parnelli Bone]

I've never noticed reduced tire wear with less fuel but it's hard to judge this because I usually drive to the limit during endurances, unless I'm trying consciously to conserve tire wear. But like I said earlier, I have noticed small gains in speed, especially down long straights, when the tank is at 3 bars or less.

 

[GTsail]

Perhaps its due to the pedestrian speeds that I drive, but I have always noticed reduced tire wear from lower fuel loads.

In the FGT Series races my pit stop sequence would frequently look like the following: 7/8/8/8/8/8/8/8, since my tires would turn orange one lap sooner with the full fuel load. From then on I would get approximately the same tire wear since I was always doing only partial fill-ups. I know I was pushing about equally hard since the AI was right on my tail!

I have been seeing the same phenomenon in my on-line races in the Arcade mode. Often, but not always, my first stint is one lap shorter during the longer races in race cars like the Nissan R390 GT1 that I drove recently. During these races I always try to have the minimum fuel load to get me to the next pit stop.

Respectfully,
GTsail

 

[Car-less]

...something to try would be to have B-spec Bob drive a car from the start until the fuel gauge was reduced by 40 units (from 80 down to 40). And then have Bob pit for tires only. Then have Bob drive off the rest of the fuel (from 40 down to zero) and see how far he goes (overiding the pit-in signal).

I'd be tempted to have Bob run three seperate tests, each one consisting of multiple sessions of just three laps; outlap, hotlap, inlap. Record the hotlap time, then send him back out. Repeat many times.

Test 1; Refuel, but keep old tyres at each pitstop.
Test 2; Refuel and change tyres at each pitstop.
Test 3; No fuel, but change tyres at each pitstop.

You could then compare the three sets of data to see what (if any) effect fuel weight and tyre condition have on laptimes.

I'd do the tests myself, but my PS2 has quit reading dual layer disks completely - I can't even check to see if it is possible to run the car with the effects of tyre wear and fuel use but without opponent cars on the track. This last point is important if you want to be sure of not tainting your data with the possible effects of AI contact and drafting.



On Topic - I used to find my best times were late in the yellow, up to mid orange stage. Dark orange and my times would start to dip slightly before falling off a cliff somewhere in the red.

 

[Nicktune]

Heres few laps with the B-Spec Dummy without damage tire/gas on the Suzuka East course(very small track).Arcade mode.No opponents

Mazda RX8 LM
I've done more than 8 laps but I'm not gonna list them all

Lap 1 - 47.079
2 ----- 47.101
3 ----- 46.758
4 ----- 47.196
5 ----- 47.096
6 ----- 46.870
7 ----- 46.863
8 ----- 47.279

difference 0.521 on a very small track.
I think the B-spec mode can't do enough constant laps .



Whatever Enjoy Racing👍

 

[GTsail]

I'd be tempted to have Bob run three seperate tests, each one consisting of multiple sessions of just three laps; outlap, hotlap, inlap. Record the hotlap time, then send him back out. Repeat many times.

Test 1; Refuel, but keep old tyres at each pitstop.
Test 2; Refuel and change tyres at each pitstop.
Test 3; No fuel, but change tyres at each pitstop.
....

I like your proposed test Car-less

Perhaps it could be tried in the Endurance Race at the Motegi SuperSpeedway in an inferior car so B-spec Bob does not draft anyone.

Respectfully,
GTsail