Z06 RM Tuning Help

Stotty
I'll give it a go if I get chance.

Send me a friends request (GTP_Stotty) if you like... I'm away all week on business and likely I'll have forgotten about this by the time I get home Friday night (my memory is rubbish!).

Plus you'll also be able to try any of my cars on share and see what you think of my -ve toe wonders (or nightmares ;)).
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I'll send FR today, I'll be sure to test your shared cars, by the way, on some cars that are hard to tame, I tend to experiment with max toe first, like +1.00F -1.00R, then -1.00F +1.00R while the rest are static, then try 0F 0R, to know how far the toe can affect the tune, then I go by 5 increments on a combination that makes the car handle better in corners until I find the balance - example - Yellow Bird +F +R for me.

I did this as not every car react the same to even the same toe settings like 0F 0R ( even with the same drivetrain ). It's tedious, but usually I end up with toe settings that's suited to my driving style or suited to my goal of tailoring car's behavior.

Edit : My last post here, I will be posting on MCH new thread in the future:D
 
rams1de
The second post requires substantial editing, it's too difficult make sense of it because of the extraneous info.

Couldn't this thread be added to the stickies as is, with brief descriptor to clarify the topic?
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Great suggestion. Now linked in post 2.
 
Stotty
I was thinking about this last night after I'd signed off... and I’m struggling to understand why –ve front toe would help turn in whilst +ve front toe would help with mid corner and exit speed. If –ve front toe helps turn in, why would it not help mid corner, unless it’s just perceived feel during the initial phase of cornering. My experience is the reverse of this (+ve front toe helps initially, but hinders mid corner)… or at least that’s how it felt to me pre 2.09 – I haven’t tried +ve front toe seriously post the update.

The more I think about it the more I conclude +ve front toe can only induce understeer when there’s lateral load on the tyre – the inside (relatively unloaded) tyre will be trying to scribe a shallower radius and working against the outside (loaded) tyre rather than helping it... and this effect should be consistent whenever there’s lateral load on the tyre, be it entry, mid or exit (although the magnitude of the effect may be higher with higher load levels).

I will of course test it out… and make sure I do it when I’m well in to a session, have a good feel for the car and running consistent laps. Hopefully I’ll get chance this weekend if my wife doesn’t have any plans for me.
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But with negative toe you can't turn the outside wheel as much, and/or if you do, the inside wheel is turned extremely hard, which on fwd, can increase wheelspin.
How/why it makes rwd rotate better on exit I'm not sure.
My guess would be that with heavy rearward weight propulsion, the balance on the front wheels is usually more even, as you're not steering as much as you were mid-corner, in which case +ve toe adds traction.(before you exceed the limit)

Meaning in theory you could turn as hard on exit with -ve toe, but you'd have to steer so hard the rear would kick out. (because you'd need to transfer enough weight and steer enough for -ve toe to have more grip than +ve toe, which can exceed the tires limits itself)
It could be a "response" on exit issue, but what I'm certain of is that it improves my exit speeds on a lot of cars. (exit speeds are king for everyone tbh)
 
for some reason when i used DS3 i found that negative/negative helped me make the car turn more, but make the back be only say -0.05 with the front at -0.15-0.20
 

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