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The Diff In Coast

differential diff coast

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#21 John Woods

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Posted Jan 12 2019 - 01:09 PM

TP, good idea...nothing wrong at all with your approach.
Seems you are your own expert.

Agree different cars and tracks, such as Spa in the Eagle compared to Nurburgring in the Lotus, do require different diffs. Either car at Tucuman would need something very different than Le Mans.
:)


:D

Edited by John Woods, Jan 12 2019 - 01:11 PM.


#22 Pete Gaimari

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Posted Jan 12 2019 - 01:30 PM

I use the same diff setting for all tracks. However, the mods will use different diff setting. A diff setting used for the 65 mod would be pretty loose for the 67 F1 Papy cars.

#23 Bob Simpson

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Posted Jan 12 2019 - 01:44 PM

Interesting thread.

One of the big problems (I know from experience) is to download other people’s setups knowing only that those people are fast and not understanding why. This thread should help.

My driving really improved when I started thinking about what the car was doing wrong – or just how I could get the car to do what I wanted. Tightening and loosening the diff settings made more sense and I’m definitely still learning. Tie that in with the many other chassis settings, and car and track characteristics, and it all becomes a challenge. But that’s part of the fun. I guess that in real life some drivers had their cars set up for them but the engineers probably knew the driver’s style, limitations and strengths.

One other problem is that you could take very good drivers and they could go fast with almost any setup because they understand how to adjust their style and have the reflexes to do it. I’d encourage people to decide on how they want to drive. Then you could possibly start with someone’s setups who drives the same way, or develop your own. Hitman’s suggestion of 60/45/2 is a good starting point, although I think that CanAm 71 monsters might need different settings than the 65 cars, as Pete says

#24 JonnyA

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Posted Jan 12 2019 - 02:16 PM

I tend to tune the diff behaviour using the number of clutches, but I still use 30/85 about 90% of the time. It was only when I started to play around with the diff that I realised my natural style is to turn in very late, rotate the car very quickly and get onto the gas ASAP for a straight-ish corner exit. Not saying it's the fastest way, just that it works for me. Understeering set-ups I find both frustrating and slow.

#25 mcmirande

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Posted Jan 12 2019 - 04:45 PM

Hi all.
Recently I found this explanation about toes very useful to understand how much, in which manner, and why the car handling may vary even if using the same diff settings.

http://racetrackdriv...rack-alignment/

Cheers, Marcos.

#26 Claudio Pablo Navonne

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Posted Jan 13 2019 - 07:10 AM

Thanks Marcos for the link, I thought it was very useful!

#27 Iestyn16

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Posted Jan 13 2019 - 03:09 PM

No joke but Carsten Theile once sent me a Brabham setup for Monsanto that had a 30/85/6 diff. This was after he moved to RFB + clutch! :alien:

#28 Pete Gaimari

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Posted Jan 13 2019 - 05:58 PM

I saw someone driving a diff setting like that and RF braked. It was pretty impressive. He was going back and forth between throttle and braking to catch the rear of the car really fast.

Not a comfortable way to drive to me but he was good at it. I'm not sure it was the same guy?

Certainly, not the hot setup for the average GPLer like me.

#29 Brocky05

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Posted Jan 13 2019 - 07:24 PM

Pete you are FAR from being an average Driver

#30 Millennium

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Posted Jan 14 2019 - 01:19 AM

I used to always drive with 60/45 1C, but in the beginning of this year I started to learn driving with the 30/85 Steve Cloyd setups. It defenitely changes the way you have drive (lots of throttle) even though it's probable not realistic. But it's easy to see why aliens chose setups like this.

Have to add that I changed from 270 degrees of rotation with a 12:1 ratio (like the visesable steering wheel) to 540 degrees with a 8:1 ratio. With the 270 degrees that I was used to there's now way I could keep the car under control with 30/85 diff settings and the brake balance at 49.

Edited by Millennium, Jan 14 2019 - 01:20 AM.


#31 Pete Gaimari

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Posted Jan 14 2019 - 09:21 AM

 Brocky05, on Jan 13 2019 - 07:24 PM, said:

Pete you are FAR from being an average Driver

Thank you but I sure am compared to the fast guys.

#32 Brocky05

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Posted Jan 14 2019 - 04:52 PM

your way faster than i am n theres a lotta ppl slower than me

so yeah your betterr than average

#33 Pete Gaimari

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Posted Jan 14 2019 - 04:59 PM

Speed is over-rated. What's important is to finish a full GP with no spins or mechanical problems. ;)

#34 orlinos

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Posted Jan 15 2019 - 04:50 AM

 Pete Gaimari, on Jan 14 2019 - 04:59 PM, said:

Speed is over-rated. What's important is to finish a full GP with no spins or mechanical problems. ;)

Yup, that's how I got 4th instead of 5th at Watkins Glen yesterday. Poor Jim!

19m00.520s
Jim Clark - spotters reporting:
the car has an engine problem.
Jim Clark retires!
Official retirement reason is: Piston

#35 John Woods

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Posted Jan 15 2019 - 08:38 AM

Let the other guy lose = easy money.
And you are not showing off.
:)


Readers of this thread may have already noticed the thread started by Robert Fleurke "Secret Setup Quotes," (tagged below - scroll down), featuring several members who have posted here recently.

Turns out we are churning thru the same topic.
No coincidence members posting there offer some really great insights.
:P

Secret Setup Quotes is the thread that has helped my own understanding of how to use the diff more than any other, and from that, how to tune and turn the car based on applying diff rotation and throttle.

Looking thru my comments back then, it is easy to see there must have been some off-line aha moments along the way, and that Robert's thread is where this thread actually began.

Like some weird wild goose chase mental road course where it takes three years to make a lap...


Big thanks to Robert and Anonymous
:D


How Paul Frere and Stirling Moss rotate a race car in 1950s:
http://srmz.net/inde...showtopic=12701

GPL Salisbury Limited Slip Differential
http://srmz.net/inde...opic=12596&st=0

Attached Files


Edited by John Woods, Jan 16 2019 - 07:36 AM.






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