I can’t seem to reduce the oversteer problem on my peugeot 205 t16.
It keeps oversteering like an idiot and no matter what I do it stays that way
If tried to stiffen and sharpen every thing at the front like de roll bars and
lower the pressure on the front tire and up the pressure in the back.
Soften spring tension at the back more than at the front. NOTHING NOTHING
seems to work… I’m not looking for an ready tune I’m looking for help since I
want to learn this…
Is the rally engine swapped in? I tried that and the power curve of that engine means that any power input means that you have far too much power, and break traction.
If you are tuning for A-class, then you want everything upgraded for all except engine (although clutch and driveline are not vital, but the lack of weight means that there is slightly less power), and throw the V6 in and leave it naturally aspirated. It will still be slidey, but drive carefully and you should be OK.
Also, the gigantically enormous wings make the car over 9000 times better (kinda), as well as reducing the opposition to laughter.
Major handling problems like this typically won’t respond to any single change and may require a blank sheet approach. I built an A700 205 T16 with rally engine, slick tires, and no aero to find out what you were dealing with. Based on that, there are several critical areas you may want to address:
- Differential - Since the car has a short wheelbase and so much torque, the differential settings are critical to keep the car from swapping ends. I went with 30/0/15/0/60 and got good results. Notice that the front axle will lock before the rear under, meaning that the car will be more stable under power.
- Ride Height - In the default setting, the car rides about an inch higher in the rear. Therefore, the roll saturation rate is higher in the rear, contributing to lift-throttle oversteer. Set the ride height so that the FRONT is a 1/3 - 1/2 inch higher than the rear to reverse this effect.
- Damping - Try a front rebound setting that is about 1.1 to 1.2 times stiffer than the rear. Next, set the front and rear bump stiffness so that they are about half of the respective rebound setting. Finally, set the rear bump about one or two clicks firmer to help reduce post apex oversteer.
- Alignment - Set the front camber to about -0.5, the rear to about -2.0, and toe in the both by -0.2. This setting will promote stability on corner entry and reduce post apex oversteer.
I hope you find this helpful. That car is a quite a handful, but you should be able to dial it in from here.
Notes:
Tires were set at 30/28 and of equal size.
ARB set at 24/20.
Front and rear springs set equal at 700.
Brake bias set at 47%.
As you don’t mention when the oversteer occurs I’m assuming it’s from apex to exit.
One thing that might work is putting extremely soft front rebound, and increasing front acc diff up to 70+ figures.
When that tail snaps loose, the front should still have grip, and flooring the throttle could let the front pull the back end back in line.
Although that might require equal or even somewhat front heavy power distribution.
How ever, if it happens in entry, add higher decleration settings on both front and back differentials, 5-20 in front and 5-40 at the back
I’ve experienced the same with my build. The oversteer feels gradual when threading in the throttle power after apex, which you need to do as it stands with an un-tuned build for this car in A Class. It’s almost the effect you’d see if you had a rear toe setting.
If you take turn 3 on Catalunya as an example… you would have to have some pretty good throttle control to get around that corner whilst maintaining a decent speed.
I’ve haven’t began to try and tune mine yet as I’m trying to get a paint finished but I’ve considered wider rear tires but even before that I actually think it could be dialled out.
It does require quite a bit of throttle maintenance. Not an easy car to drive, but I agree that it might have some potential. I’m not sold on the rally engine though, my build was pretty much unhinged.