Corvette understeer understanding

  • Thread starter Crowood
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Crowood

Crowood

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Germany
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Crowood
Hey ppl, i need a little understanding help here.

Much cars i have driven in GT5 push over the front wheels, so i read in the APEX book (Collectors edition book), how to fix understeer:

It says, adjust front springrate down and dampers high.

So i did it, but the corvettes for ex. understeer even more with those settings.

I looked at some of your tunes here and noticed the springrate often is set high and that reduces understeer by all the corvettes......so why?

Has it something to do with 4WD, front and rearwheel drive?
 
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Hey, Crowood. Fwd - Front wheel drive, Rwd - rear, 4x4 - 4x4 :)
Understeering is a big of a problem.
It mostly occour on 4x4 and fwd. If you use a ff, or a 4x4 then there is not much to do beside let off the gas, break off a little, and slow down even more for corners.
If youre having trouble with Rwd, there are two things that makes understeer.
If you put too much throttle in a corner, the weight will go back, wich will give less grip to the front wheels. Breaking will put too much weight and will cause it to slide.
What you wana do is put on a gentel throttle. Ones you find the right throttle ammount to do the corner, keep it at that rate and just go throught the corner. I sugest using a driving line to learn the braking spots.
Try using a RM corette '09. The more downforce on front, the less understeer, and the more speed you can take corners.
I sugest using RKM's tunes for every car as they are insanely amazing.
Pm if you need any more help. Just try to get used to the car a little bit and learn the braking points. Break earlier, keep a steady throttle through out the corner. If you're using a wheel, dont turn it more then half a turn, 180 degrees.
Goodluck!
 
Hey thx for the reply Italiano 👍

Maybe i wrote my text above a bit mixed up ^^ (i am aware of the things you wrote)

I´ll try to type my missunderstanding again in a shorter version:

The corvettes tend to understeer in corners, so what i did was follow the "apex tuning guide" and lowered the spring rate, increase the dampers etc.

What happend was the exact opposite, the corvettes understeer now even more.

So i increased, after watching some of the tunes available here, the springrate and the understeer is nearly eliminated.

example in numbers (front):

spring rate (stock 11.5) lowerd -6 to 5.5
dampers 8/10 = MORE understeer

spring rate (stock 11.5) increased +2 to 13.5
dampers 8/10 = LESS understeer

So why does this happen?
 
A stiffer front than rear should tend to oversteer. It is like it is.......
Almost every AWD, FF tune is done this way.

I don't know what dampers 8/10 is..........front and rear compression? Front extension and compression?
 
dr_slump
A stiffer front than rear should tend to oversteer. It is like it is.......
Almost every AWD, FF tune is done this way.

I don't know what dampers 8/10 is..........front and rear compression? Front extension and compression?
Click to expand...

my corvette C5 setting where like this

Ride height: -18 / -15
Spring rate: 7.6 / 8.5
Dampers (ext): 8/8
Dampers (comp): 3 / 4
Anti-roll bars: 3 / 4
Camber: 2.5 / 2.0
Toe angle: -0.15 / 0.20
Braking balance: 7 / 6

then i changed ONLY the spring rate to 12.5/ 10.00 and the understeer was nearly gone. (numbers not 100% correct)
 
my knowledge on setup isnt exactly what you'd call "knowledgeable" and with GT5's unusual way of representing some of the settings it makes it harder, but I think your problem here COULD lay with the Roll Bars. try Stiffening the front maybe.

when your driving pay attention to the tyres, if both of the fronts are turning red simultaniously then it means both of the fronts are "scrubbing" and your pushing forward that way.

if however one is turning red before the other : IE: turning left and the front right goes red, then the front left, then I believe the problem may lie in the roll bar is too soft, and too much weight is being put onto the right hand side (in this example) and overloading the tyre causing it to slide.

Sorry, I'm not finding that the easiest of things to explain. :(
 
Crowood
my corvette C5 setting where like this

Ride height: -18 / -15
Spring rate: 7.6 / 8.5
Dampers (ext): 8/8
Dampers (comp): 3 / 4
Anti-roll bars: 3 / 4
Camber: 2.5 / 2.0
Toe angle: -0.15 / 0.20
Braking balance: 7 / 6

then i changed ONLY the spring rate to 12.5/ 10.00 and the understeer was nearly gone. (numbers not 100% correct)
Click to expand...
Yes, like I said.
A stiffer front than rear should tend to oversteer. It is like it is.......
Almost every AWD, FF tune is done this way.
Click to expand...
The stiffness is usually adjusted by spring rate and bars.

This guide is very helpful. https://www.gtplanet.net/forum/showthread.php?t=135268 I know it's for GT4, but the most things are correct. There are just a few exceptions, as example ride height.
 
So my corvette understeer problem came from the too soft spring rate and bars :dopey:

Well, i thought i was supposed to soften it to get less understeer.....:grumpy:

A stiffer front than rear should tend to oversteer. It is like it is....... That helped me a lot, Thx 👍
 
Crowood
So my corvette understeer problem came from the too soft spring rate and bars :dopey:

Well, i thought i should soften it to get less understeer.....:grumpy:

A stiffer front than rear should tend to oversteer. It is like it is....... That helped me a lot, Thx 👍
Click to expand...

Well, your front bar is at 7, the maximum. I usually don't set a bar higher than 6. Of course, it could work with the Corvette, I don't know. But you could try a bar of 6/5.

Another thing is, and it makes it a bit more difficult, that a setup with a slightly stronger rear bar, but stronger front springs could also be less understeering and at the same time less nervous with the rear.
Yes, it sounds strange, but you've to try it.
Example (probably doesn't work with your car) :
- Spring: 12/8
- Bar: 5/6
 
I have a couple of Corvettes tuned in my garage. They don't understeer. See link below.

I own like six or eight Vettes, so it's time to get those tunes refined and posted.
 
This is freaking Me out Too! Cause in the Tuning menu help in gt5 it says softer Front stiffer rear = overstear aswell As Lower Front higher rear Causes oversteer, but everything i tried with Most Cars is just the opposite! I Tried to get my vettes to oversteer As hell i also changed LSD to nearly 5-5-5 but Even in conors if i Slam the Gas nothing happens ( all AIDS off Abs 1) sorry for the Bad writing im on my iPhone and from Germany so the autotext**** is pissing me off!
 
Hi Crowood, you've stumbled upon one of the biggest tuning myths in GT5! IMHO the traditional theory of diagonal weight transfer tuning (where the stiffer end should have less grip) barely ever works in GT5. A stiffer front will usually result in better turn-in, instead of increasing understeer which the traditional theory would suggest (I won't open the can of worms about whether this is realistic!).

The most reliable ways to reduce understeer are
- increase front downforce
- increase front camber to 2.2 for sports tyres or 2.5 for racing tyres
- increase -ve rear toe
- reduce LSD Initial to minimum

Also, if you are able to identify handling problems more specifically (zb instead of "understeer" it's "entry understeer", "high speed mid corner understeer" or "power understeer") then you'll become better at making a car handle just how you want it to.

Hope this helps,
Simon
 
Sorry for reanimating this thread, but yesterday i made a huge step forward with the vettes driveability (discovered this while driving my aston vantage v12):

Works as a good base setup for all vettes, if you suffer understeer:

Spring rate: 11 / 9
Dampers (ext): 6/5
Dampers (comp): 4 / 5
Anti-roll bars: 6 / 4
Camber: 2.6 / 1.8
Toe angle: -0.15 / 0.10

Tested with various vettes (RMs and street ones) on Nordschleife and La Sarthe.
 
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The settings in the game are backwards from the description. Its that simple Stiffer front softer rear oversteer. Softer front stiffer rear understeer forget what the game says they made a mistake in the programming its reversed from what it says...
 

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