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Author Topic: Confused and Frustrated  (Read 81 times)

Offline Tech G

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Confused and Frustrated
« on: October 22, 2017, 03:45:04 am »
In the braking zone for the first corner at Blackwood my car is pulling hard left for no obvious reason.  I have tried different setup up, different lines, brake bias, brake pressures, easing off more, braking earlier and it still pulls left only at this corner  :-\.  This does not seem like normal physics to me, I am braking in a straight line with zero steering input when the back end starts to go.  ::)

https://www.youtube.com/watch?v=Q_qxzMiotDM&feature

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Offline Marketcrash16

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Re: Confused and Frustrated
« Reply #1 on: October 22, 2017, 04:45:19 am »
that happened to me as well, but it was because my camber was significantly different on my left side from my right. I haven't felt it since I changed it.

Online Chad Brown

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Re: Confused and Frustrated
« Reply #2 on: October 22, 2017, 05:57:06 am »
I don't have that specific problem. I know that I have to be careful and brake with some control in mind. There are some parts of the track with weird cambers that make the car behave unpredictably. The start finish hill is one of them A person can pretty quickly lose control of their vehicle if they are not mindful.

Offline CJR33

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Re: Confused and Frustrated
« Reply #3 on: October 22, 2017, 08:42:00 am »
I had similar problems in this corner, there are three options in setup to make it better:

1. Increase coast diff to a value between 60-70 %
2. Increase rear toe in to + 0,2 to +0,3
3. Soften the fast bump dampers at front and rear

I cannot make the race, had a horrible week with no time for practice at all.
Next weekend should be fine, at least I am hoping that right now.

Offline Tig_green

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Re: Confused and Frustrated
« Reply #4 on: October 22, 2017, 09:40:46 am »
I have no such problem. Looks like you start braking in the same spot as me. Maybe you should loose the brake a little earlier...
In order to win you need to be willing to roll the dice.

Offline Tech G

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Re: Confused and Frustrated
« Reply #5 on: October 22, 2017, 02:07:09 pm »
Thanks for the suggestions guys, I was hoping someone would have something other than the normal suggestions. As you know I am pretty good at setups and I know how to modulate the brake pedal, so I also tried different braking techniques into this corner, but that snap left pull is always lurking.  Even when I tried Rick's exact set up, he do not have this issue but I still did, so I guess it's either driving style (braking in a straight line 🤔) or maybe my equipment.

Oh well I guess I will just see how it goes and drive until this strange issue takes me out.  I would suggest no one try to pass me on the outside here 😉.

Online Scott Arrington

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Re: Confused and Frustrated
« Reply #6 on: October 22, 2017, 02:47:23 pm »
 
Probably a stupid question Chris,but have you tried to stay alittle more to the right,not so close to that curb under braking.There are some braking bumps there.I modulate the brake pedal,on hard then half brake then brack on full brake.It is a tricky section.If that doesn"t work,just for the sake of knowing,calibrate your clutch pedal as your brake and see if it still does that.Also could try to run the brake pressure down to 93.

Offline Tech G

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Re: Confused and Frustrated
« Reply #7 on: October 22, 2017, 07:44:37 pm »
Thanks as always for the help guys and Scott special thanks for the setup, race saver.
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Offline Marketcrash16

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Re: Confused and Frustrated
« Reply #8 on: October 22, 2017, 09:11:16 pm »
Thanks as always for the help guys and Scott special thanks for the setup, race saver.

Scott is the man. He has helped me countless times.

Offline Tech G

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Re: Confused and Frustrated
« Reply #9 on: October 22, 2017, 11:23:53 pm »
So, because this bothered me so much, I did a quick analysis between my setup that was pulling hard left braking into turn one and the setup Scott sent me, which I then modified a little.

I was surprised how similar our setups were, mostly very minor differences, the only significant differences where in the spring rates, but i have summarized below the major differences:

                                               Scott's                    Mine
Front Springs                             219                        210
Rear Springs                              175                        201
Rear Slow Rebound                      3                            6
Rear Fast Rebound                       2                           6

The rear rebound does directly effect the cars behavior under braking, the weird thing is that you would normally need a higher number to slow the transfer of weight off the rear tires and keep more weight on them under braking.  So reducing this number should have made the problem worst  ::).

 

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