History of FATS ... information request ?
04-26-2006, 10:12 PM
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History of FATS ... information request ?
I figured that as the creators and perfectors of the FATS database, this would be the place to go for some questions. Tonight my brother and I were out logging his S4 and i realized that I have not come across a similar database for VW's, in particular the lowely 2.0 engine.
What I am looking for is exactly how the database was created and what prompted the use of the numbers, as well as how it is actually calculated.
* why 4200 - 6500 rpms
* how is the actual FATS number calculated
* does the 3rd gear ratio of the trans have an affect on the FATS #
I appreciate any input you have as I hope to create something useful for us forgotten 2.0 owners. Thanks in advance,
What I am looking for is exactly how the database was created and what prompted the use of the numbers, as well as how it is actually calculated.
* why 4200 - 6500 rpms
* how is the actual FATS number calculated
* does the 3rd gear ratio of the trans have an affect on the FATS #
I appreciate any input you have as I hope to create something useful for us forgotten 2.0 owners. Thanks in advance,
04-27-2006, 04:36 AM
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Well.....
FATS (For Advancement of The S4) was started by guys trying to get the S4 faster.
The rpm range was chosen because it is close to 60mph to 90mph. This acceleration time is used by car magazines to rate the speed of other cars. So it can be used to "loosely" compare our cars to other cars.
The FATS time is calculated as the time it takes to get from 4200 to 6500 in a 6 spd. The TIP FATS are a different rpm range since the gear ratios are different. Since logging almost never lands directly on both 4200 and 6500, linear extrapolation (yes high school algebra is back) is used to calculate the what the time would be at those exact rpms.
Since the rpms are picked to represent certain speeds, changing the 3rd gear ratios will ABOSLUTELY impact FATS and no longer be useful for comparing to other 6spd S4's.
TIP note. IIRC The TIP FATS is 6100 to 6350. But since the gearing is different, the times are not directly comparable. Just comparable from Tip to Tip.
The rpm range was chosen because it is close to 60mph to 90mph. This acceleration time is used by car magazines to rate the speed of other cars. So it can be used to "loosely" compare our cars to other cars.
The FATS time is calculated as the time it takes to get from 4200 to 6500 in a 6 spd. The TIP FATS are a different rpm range since the gear ratios are different. Since logging almost never lands directly on both 4200 and 6500, linear extrapolation (yes high school algebra is back) is used to calculate the what the time would be at those exact rpms.
Since the rpms are picked to represent certain speeds, changing the 3rd gear ratios will ABOSLUTELY impact FATS and no longer be useful for comparing to other 6spd S4's.
TIP note. IIRC The TIP FATS is 6100 to 6350. But since the gearing is different, the times are not directly comparable. Just comparable from Tip to Tip.
04-27-2006, 05:13 AM
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Also...despite the fact that people like to compare one car's FATS to another...
over time I feel the real benefit of FATS is to baseline and compare your OWN car to determine whether or not modifications/tweaks are proving beneficial or detrimental.
