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Gpl Salisbury Limited Slip Differential


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#41 Lee200

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Posted Jan 05 2019 - 08:53 AM

View PostRemco Hitman, on Jan 05 2019 - 04:09 AM, said:

Niels Heusinkveld did an experiment years ago, sending out three setups with varying diff settings for blind testing to a bunch of volunteers. Much discussion ensued as to which was which, as opinions varied which was the most aggressive setup.

The diff settings were all equal.

Yes, I seem to remember Niels doing something like that.  Apparently, someone has to be a very good GPL driver to discern subtle differences in setups.  I'm not one of those.  :)

Marcos may well be and I don't dispute what he feels.  If there is a difference in handling with the same lock percentages, it's a mystery to me why.  One caution for any testing though...it's OK to change the ramp angles and number of clutches, but the same power and coast locking percentages should be used to compare apple to apples.

#42 mcmirande

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Posted Jan 05 2019 - 09:07 AM

View PostLee200, on Jan 05 2019 - 08:53 AM, said:



Yes, I seem to remember Niels doing something like that.  Apparently, someone has to be a very good GPL driver to discern subtle differences in setups.  I'm not one of those.  :)

Marcos may well be and I don't dispute what he feels.  If there is a difference in handling with the same lock percentages, it's a mystery to me why.  One caution for any testing though...it's OK to change the ramp angles and number of clutches, but the same power and coast locking percentages should be used to compare apple to apples.

Ok, I'll do some additional tests.

Thanks for this great thread and the feedback :)

Marcos

#43 TvO

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Posted Jan 06 2019 - 04:11 AM

View PostLee200, on Jan 05 2019 - 08:47 AM, said:



Robert Michael James Gascoyne-Cecil according to this:  :)

https://en.wikipedia...ss_of_Salisbury

:D

#44 John Woods

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Posted Jan 06 2019 - 10:35 AM

Hacked the graph from Lee's post #29...

Is this correct?
:)

15/85/1 diff setting did not fit.

This is "the fastest diff in GPL"?
For given shock setting, offers the most rotation in least time?

Is it the differences in locking percents between power and coast, rather than each specifically, that cause the range of possible suspension transition effects when not traveling center-balanced in a straight line?

Lots of range between 15/85 and 85/15?
(In percent, 10:1 - 1:1 - 1:10).


:D

Attached Files


Edited by John Woods, Jan 06 2019 - 10:48 AM.


#45 mcmirande

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Posted Jan 06 2019 - 01:46 PM

John, that graph is not correct. Each line is a number of clutches.
To see how 15/85:1 is, you should project leftwards the line of 1 clutch (the lowest one)

Marcos

Edited by mcmirande, Jan 06 2019 - 01:46 PM.


#46 John Woods

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Posted Jan 06 2019 - 03:26 PM

In the Setup Manager dialogue, (2nd pic abv), at 15/85 power side locking shows 10 percent?
On original graph one clutch line shows 10 percent locking at +/- 45/xx ramp angle?

So yes, thinking something is incorrect.


Probably me yet again.
:D

Edited by John Woods, Jan 06 2019 - 03:36 PM.


#47 mcmirande

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Posted Jan 06 2019 - 03:30 PM

View PostJohn Woods, on Jan 06 2019 - 03:26 PM, said:

As in the Setup Manager dialogue, 15/85 power side locking is 10 percent?
On original graph one clutch line shows 10 percent locking at +/- 45/xx ramp angle?


:D

Ahhh, ok. I understand now what you said :P

#48 bingo

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Posted Jan 07 2019 - 11:05 AM

I'm a bit out of the loop here, so sorry if this has been discussed to death already, but what does this mean for a realistic diff setup (in terms of behaviour, not numbers on screen)?

Last I heard (from a youtube comment, so I don't know how good the info is) was 45/85/1 was the most realistic. I tried it yesterday and it seems to stop the "rubber band" feeling when adjusting mid-turn and allows me to 4 wheel drift much more easily.

#49 John Woods

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Posted Jan 08 2019 - 07:04 AM

If you continue to drive Grand Prix Legends, (hour after hour after hour because it is too much fun), then as talents improve by default your style and technique will over time tend more and more toward being realistic.

That is what a really good racing simulator does.

When going off throttle the diff goes into coast and the car rotates. A loose diff like 15/85 rotates the car more than a tight diff like 85/15.

As realistic driving skills are developed there is a general tendency to use looser diffs.


JMO
:D

Edited by John Woods, Jan 08 2019 - 07:13 AM.


#50 Pete Gaimari

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Posted Jan 08 2019 - 08:55 AM

How are you describing loose John? Loose as to how the diff is locked or loose on the track with oversteer? A 15/85/1 setting would be locked tight on the power side but loose and freewheeling on the coast side. Both settings would have oversteer going in and out of a turn.

Edited by Pete Gaimari, Jan 08 2019 - 08:56 AM.


#51 John Woods

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Posted Jan 08 2019 - 10:26 AM

From the driver's on track POV always if possible.
More coast-induced rotation = looser?

Pretty sure that is correct.


:D

Edited by John Woods, Jan 08 2019 - 10:32 AM.


#52 Pete Gaimari

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Posted Jan 08 2019 - 10:55 AM

John...... When turning into a turn a higher number (85) will feel looser. That's off power.

When accelerating off a turn a lower number (15) will lock the diff and too much power will spin both tires which will be oversteer. This would be a tight diff.

Both of those settings will want to turn the rear of the car. That is loose on the track.

Careful you don't confuse loose in the diff and loose on the track.

#53 John Woods

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Posted Jan 08 2019 - 01:28 PM

Never sure if I am confused or not.


:D

Edited by John Woods, Jan 08 2019 - 06:36 PM.





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