I need a couple of basic tips

[WheelerDealer]

Hi, there is so much good info here I can't sort through it all!!

I tune a bit but usually not very effectively. I search here for most tunes I use but many times they aren't exactly what I'm looking for so I bumble about trying to tweak them for what I need. Could you give me some tips or point me to existing threads that would help.

Where do you start if you have a good tune but you want to adjust it for:

1) tires with more grip

2) tires with less grip

3) add a wing

4) detune to lower PP

5) lower the height

6) add chassis stiffness

Thanks

 

[killerjimbag]

Wheeler I sent you a message.

 

[Johnnypenso]

Where do you start if you have a good tune but you want to adjust it for:

1) tires with more grip

2) tires with less grip

3) add a wing

4) detune to lower PP

5) lower the height

6) add chassis stiffness

Thanks

Start here. This will give you all the basics you need from tuning.
[post=4641242]Motor City Hami's LSD Tuning Guide[/post]

I'll give you a very, very brief series of answers...very very brief.

1) tires with more grip << In my experience cars tend to get tighter or move towards understeer more as in go up in tire grades so keep that in mind. General rule of thumb is the softer the tire the firmer the suspension.

2) tires with less grip << opposite of above

3) add a wing << don't unless you have to and have used all other tuning options to fix oversteer. For a fixed PP, adding a wing costs you HP or weight, usually not necessary on most street cars.

4) detune to lower PP << in a pinch just lower the engine limiter. Better to take parts off though. If possible keep the racing exhaust, cat conv. and ECU as they have the best bang for the buck in terms of add ons. Try not to use more than 10-15% engine limiter.

5) lower the height << sharpens the handling. Going too low might make it too lively and hard to control.

6) add chassis stiffness << Don't. Tends to make cars understeery and has demonstrated no real advantage.

My advice would be to take a car you like, find a couple of tunes from the top Garages in the Tuning Forum and put them on the car. Take whichever one you prefer and then make adjustments to it. Change one thing on the car dramatically then run some laps. Take the Accel LSD for example and change it from 14 to 25 and see what happens. If the springs are 9.0/8.0 change it to 9.0/10.0. These larger changes will give you the most dramatic results giving you and indication of just how much influence each setting has on a particular aspect of performance.

Of particular importance, avoid racing tires at all cost or overpowering any car with tires. It will mask the tuning adjustments you make because the tires have so much grip. You may end up racing on RS tires, but you'll have a hard time learning how to tune for them without learning the lower grip tires first. Try to follow the general rule of thumb found on the Nurb PP Board when it comes to tire compounds: https://www.gtplanet.net/forum/showthread.php?t=260349

I found it's the best combination of grip to performance for most cars.

 

[MrGrado]

Very good question WheelerDealer.

1) tires with more grip
Sometimes softer bound and harder rebound, softer springs and higher ride height will help and lower ARB.

2) tires with less grip
Higher ARB, higher bound.

Strangely, sometimes when you start with high camber, high spring rate and grippy tires, lowering camber or spring rate with less grippy tires will not give improvements. It would seem logical that a lower grip tire wouldn't be able to generate the same high cornering forces to make high camber necessary.

3) add a wing
softer front bound, softer front spring rate. Get front camber more optimized if possible.

4) detune to lower PP
Nothing. Adjust gears if necessary. No need to adjust brakes, suspension, LSD. Good opportunity to tweak weight distribution if necessary.

5) lower the height
Potentially no other adjustment necessary. Possibly lower ARB, possibly increase spring rate.

6) add chassis stiffness
You can sometimes neutralize chassis stiffness by increasing ride height, lowering springs, lowering ARB. You may get a car that drives similar to how it used to, but more control/speed when driving aggressively over curbs. Or if you like, chassis stiffness gives a similar result (in handling) as lowering a car, increasing springs and increasing ARB all with one modification.

Sometimes though, if you set a car up very very nice with no chassis re enforcement, it can be difficult to get the car to drive nicely again once you add chassis re enforcement.