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Troublemaker55
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Number of posts : 5
Registration date : 2010-03-22

PostSubject: Engine Lifetime   Mon 22 Mar - 1:57

Hey!

Since lots of races hosted with your mod are very long (8-12 hours) engine management is very important. You guys did a great job providing us with cars that last that long! There is just one question I have concerning the value "Lifetimevar" in the engine.ini file.

LifetimeAvg=93600 // average lifetime in seconds

LifetimeVar=14400 // lifetime random variance

These are the values used for all of your cars. I found an interesting statement(ISI) about those values:

Quote :
This section calculates the engine life dependant on rpm, oil temperature relative to optimum, and statistical treatment of average life. The following is from ISI, courtesy of Maxsilver. I have edited the original to fit with the numbers in this file -

"The LifetimeAvg and LifetimeVar are ... the mean and one standard deviation of a normal distribution.


Quote :
The section in italics at the beginning of that quote is a later explanation provided by ITT based on some correspondence with ISI. So the engine lifetime fits a normal distribution in the statistical meaning of that term. 68% of engine lives will fit within LifetimeAvg LifetimeVar, and 98% within LifetimeAvg 2 x LifetimeVar, all modified by the RPM and temperature effects.

This means the reasonable Lifetime of a engine for this mod is from 50400secs-136800secs(14 hours to 38 hours) which is a huge spread and makes it very hard to calculate which engine boost settings/revs to use.

I know you try to be as close to the real thing as possible where engine failures happen from time to time but i think the spread is too big right now ( and i didnt even consider extreme liftime differences of more than 3x Lifetimevar). We should have atleast a basis which we can use to calculate with.

Preparing alot for a 12h event with 4 or more ppl and getting smashed by the high variance is very frustrating and shouldnt happen in a game.


You guys obviously picked those values for a reason, though. Is there any explanation why the variance has to be that high? And is there any chance that you might reconsider the values for the variance?



Regards


Markus
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MaD_King
EnduRacers beta test


Number of posts : 3050
Age : 43
Localisation : Toulouse (31) FRANCE
Registration date : 2006-09-27

PostSubject: Re: Engine Lifetime   Mon 22 Mar - 10:20

If you start for a long race (between 12h and 24h) you may not use the boost, the boost is wearing the engine (check the engine file of the car to get the Max RPM tolerated by each car, if you keep your rpm under this limit you don't use your engine. If with boost or downshift you pass over this limit, you wear your engine and can lead to break it.

The variance is applied when you pass over the RPM limit and it's a random range for rF, so you take a risk in using the engine over his race nominal rpm range.
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Troublemaker55
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Number of posts : 5
Registration date : 2010-03-22

PostSubject: Re: Engine Lifetime   Tue 23 Mar - 19:15

Where did you get it from? Could you please give me the source?




Regards
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MaD_King
EnduRacers beta test


Number of posts : 3050
Age : 43
Localisation : Toulouse (31) FRANCE
Registration date : 2006-09-27

PostSubject: Re: Engine Lifetime   Tue 23 Mar - 23:31

Troublemaker55 wrote:
Where did you get it from? Could you please give me the source?




Regards
From the team which made the physics.
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PostSubject: Re: Engine Lifetime   Today at 23:18

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