Oversteer on corner exit

[sanmusa]

Whatever you may say Poppins, but my wunes work for me, and as you know tunes are highly personal. I have tried other RUF tunes from some of the more well known tuners (Mad Finn, Deep Forest Tunery, etc) but thy didn't work for me. In the end my tune worked for me and I am comfortable with it. I reckon that PD did not accurately model cars with a large difference in tire size between front and rear. Many cars that in the real world are known to handle great but require skill to drive fast are almost undriveable out of the box in GT5: CTR, BTR, Cobra, Renault 5 Turbo, etc. I observed that all of them have staggered tire sizes. I don't claim to be the best Gran Turismo driver, but I have been with the series since 1997, so I know ho to handle the cars with a standard PS controller and know how to tune them to my liking.

Just like in the real world they were given more traction in the rear by widening rear tires, in GT5 I would like to make the front tires smaller. Alas, I can't do that. I can do the next best thing, which is to give a less grippy tire in the front. So I have been doing that, and it works for me. My CTR is a car can drive and enjoy now, my Renault 5 is a lot more predictable straight out of the box. That approach suits me. If it doesn't suit you, good for you. If there had been a be-all, end-all approach to tuning GT cars then we wouldn't have discussions on tuning nor numerous tuning shops. And if I didn't know how to tune I'd be another guy on GTP asking for a tune instead of using the search function.

 

[Poppins]

those rufs oversteer alot but harder tires is just a bandaid

 

[oopssorryy]

I don't know if I would call using less grippy tires in the front a band aid. Although I don't do it, I find it an interesting tuning option that hasn't really been explored yet.

@Sanmusa so your saying using a lesser grade tire on the front can help curb over steer, right? And do the opposite will cause over steer. If this is right I think I'm going to slap some Sports Mediums on my Celica GT-FOUR and see how it goes.

 

[sanmusa]

I have tuned some AWD cars in GT3 and GT4 using the same principles, putting less grippy tires in the rear.

 

[oopssorryy]

I have tuned some AWD cars in GT3 and GT4 using the same principles, putting less grippy tires in the rear.

Thanks for the info, the Celica I'm speaking of is AWD so I'll give this a try on Tuesday and I'll tell you how it goes!

 

[sanmusa]

I have that Celica but haven't driven it yet on GT5, one of the cars I picked from the UCD...

 

[Will27]

its best to have no toe on front or rear for cornering, because no matter what if you have it set in or out one tire is going to drag more then the other during cornering

Not correct, Neutral isn't the best toe settings specifically for cornering. You want a little bit of Toe out on the front tires for cornering (your inside tire when turning will have a smaller turning radius than the outside, this improves cornering)

Thats what ackerman is for.. Can't adjust it in GT though

 

[Poppins]

Yes you can... Set front toe to -0.10

 

[Rotary Junkie]

Yes you can... Set front toe to -0.10

That's not ackerman geometry. That's toe. There's a difference. A big one.

 

[Will27]

Yes you can... Set front toe to -0.10

That's not ackerman geometry. That's toe. There's a difference. A big one.

Yup. Thats for sure.

Ackerman when calculated correctly, will eliminate wheel scrubbing no matter what the angle of the steering is.
Because the steering kingpins are closer to the car centerline than the steering pivots, the further you turn the steering, the bigger the difference in angle will become between the inside and outside wheel(inside wheel turns tighter), eliminating scrub completely

Toe out will only eliminate scrubbing at one specific steering angle

 

[sanmusa]

On an Ackerman steering geometry the steering arms of the wheel hubs are toed out, not the tires toed in.

 

[Poppins]

Yup. Thats for sure.

Ackerman when calculated correctly, will eliminate wheel scrubbing no matter what the angle of the steering is.
Because the steering kingpins are closer to the car centerline than the steering pivots, the further you turn the steering, the bigger the difference in angle will become between the inside and outside wheel(inside wheel turns tighter), eliminating scrub completely

Toe out will only eliminate scrubbing at one specific steering angle

Lol I didnt even see the word "ackerman" in your post I thought you were saying toe out wasnt possible.