AHFS details

[Wade_Owens]

Originally Posted by Jeff Teuton

I need a blackboard.

I'd try a cold one first, I'm told it helps teachers "cope",

Wade

[RPinoski1]

Looks like we have been "BAMBOOZLED"

Reread the Major changes #'s 1 and 2 it does say all runs are counted.......not the best runs like we all thought.

And they asked for our input......!!!!!!!!!!


Taken from the 2007 NHRA archives.....


Automatic Horsepower Factoring System (AHFS) changes for 2008

--------------------------------------------------------------------------------
12/10/2007


The NHRA Tech Department has revised, for racers' review, the AHFS factoring system for the Stock and Super Stock eliminator categories for the 2008 season. Two major changes proposed for 2008 are:

1. At national events where class eliminations are run, all runs of class will be included in the AHFS database.

2. Engine family and class/engine averages will be based on the number of runs for any particular combination using a sliding scale. This format will help alleviate the inequity that has existed for combinations that have limited numbers of competitors.

Racers are asked to review the proposed 2008 AHFS format for 2008 and submit their input to racerinput@nhra.com All racers are asked to please include their current permanent number and category for verification of current status.

AHFS 2008

The AHFS is used to review and evaluate runs in Stock and Super Stock for possible horsepower or index adjustments. The review is conducted twice per racing season. The two reviews are compiled individually so the data is not cumulative. Runs included in the AHFS database are limited to final qualifying runs (Q data) and all elimination runs (E data) at NHRA national events only, with the exception of altitude adjusted tracks. At National events where class eliminations are run, all rounds of class are included in the AHFS database. The "Q" data and "E" data files are the official data gathered by the NHRA timing system and processed through the NHRA Information Technology department. NHRA "Q" data and "E" data are the only data files used for the AHFS.

The first review period includes data from national events 1 through 12 and the second period includes runs from events 13 through 24. The following procedure is used in reviewing run data:

Final qualifying and elimination runs of 1.15 seconds or more, under the index, at NHRA national events, with the exception of altitude adjusted tracks, will trigger an automatic review. Only the quickest run of each event is recorded for each competitor. (The engine family combination must make at least two runs of 1.15 or quicker before a review is triggered to prevent a "one time fast run" from triggering the system.) In reviewing runs of 1.15 or more under the index, the database of runs for the engine family combination being reviewed are put through three screenings as listed below. The screenings will look for an overall engine family average or class/engine average equal to or faster than the numbers shown below, based on the number of runs in the database. Runs of .50 and slower are not included in calculating the engine or class/engine averages:

· Engine family average: The overall engine average for all cars, regardless of class, running the particular engine combination being reviewed are included in this screening.

· Class/engine average where engine is run: The class/engine average of the car running the specific combination in the class that triggered the review is studied.

· Body style and transmission type: Also considered in the above two screening processes are body style of the engine combination being reviewed and transmission type. Adjustments are only in effect for the specific car model being evaluated. The body style are generally classified by the OEM auto manufacturers' definition of "platform", i.e., the Camaro and Firebird body are both based on the same platform and therefore considered the same with regard to body-style classification. In some instances, however, more than one body style will trigger a review. With regards to transmission type, if the class average triggers the review, the adjustment would be for classes with the type of transmission triggering the change. However, if an engine family average triggers the review, the adjustment would be for all transmission types.

If either the engine family average or the class/engine average are found to be equal to or faster than the numbers shown below, based on the number of runs in the database, a change will be initiated.

Runs reviewed
Engine family average or Class/Engine average

1- 5
1.00

6 – 10
0.95

11 – 15
0.90

16 – 20
0.85

21 – more
0.80


To more clearly illustrate how the AHFS program affects a given combination, the following is a hypothetical evaluation in Stock class for a 305-cubic-inch, 215 factory rated horsepower, fuel-injected Camaro during a review period:

Two K/SA Camaros running this combination ran 1.214- and 1.187-second under the index, triggering a review by the committee. As per the procedure outlined above, the overall engine average is analyzed first. Upon reviewing the engine average made by the 305/215/241 FI combination, 10 runs had been recorded (two in K/SA and eight in L/SA) with a total engine average of .945-second under. Because the overall engine average did not hit the required 0.95 under, the combination did not warrant a horsepower adjustment based on overall engine average.

The next step, per the procedure outlined above, is a class/engine review. The class of the car that actually triggered the review was K/SA. The class review revealed that K/SA had a class/engine average for the combination in question of 1.201-second under, therefore surpassing the 1.00-second-under requirement and signaling a horsepower adjustment for all 305/215/241 FI Camaros.

An important element to note and one most often misunderstood by racers is that although a K/SA Camaro affected the change, the L/SA 305/215/241 FI Camaros that run this combination also received a horsepower adjustment. The reason is that a specific combination can run in more than one class based on NHRA rules; therefore, all cars with the specific engine combination, transmission and body style will be affected.

Once the need for an adjustment is determined, the following sliding-scale formula, based on a percentage of horsepower, is used to calculate the horsepower increase:

Under Index
Horsepower Increase
Index Change

1.150 – 1.299
1.25%
-.05

1.300 – 1.399
2.25%
-.10

1.400-or greater
3.25%
-.15
(immediate change)


Adjustments are rounded up to the nearest full horsepower even if the fraction is below 0.5 horsepower. As an example, 2.15 horsepower is rounded to 3 horsepower. The quickest run, by the combination being reviewed, is used to determine the adjustment percentage.

Runs of 1.40 or more under the index will be reviewed and adjusted as soon as such runs were made. Runs at divisional events and National Opens are included in the 1.40 second-or-more-under analysis. This is done to better react to any out-of-line indexes or under-horsepowered combinations. Therefore, at all such events, a 3.25 percent horsepower adjustment or index reduction will be initiated immediately. The decision to adjust horsepower or to reduce the index will be at the discretion of the NHRA Tech Department.

[Bob Mulry]

[QUOTE=RPinoski1;133384]Looks like we have been "BAMBOOZLED"



--------------------------------------------------------------------------------
12/10/2007


The NHRA Tech Department has revised, for racers' review, the AHFS factoring system for the Stock and Super Stock eliminator categories for the 2008 season. Two major changes proposed for 2008 are:


Only the quickest run of each event is recorded for each competitor

************************************************** ************************************************** ***************

If this is a correct statement from NHRA then the concept of getting 2 triggers by the same driver on 2 different runs at the same event is incorrect


Bob





Bob.

[RPinoski1]

It is clear as a bell in this paragraph. Best run per event.....

Final qualifying and elimination runs of 1.15 seconds or more, under the index, at NHRA national events, with the exception of altitude adjusted tracks, will trigger an automatic review. Only the quickest run of each event is recorded for each competitor. (The engine family combination must make at least two runs of 1.15 or quicker before a review is triggered to prevent a "one time fast run" from triggering the system.) In reviewing runs of 1.15 or more under the index, the database of runs for the engine family combination being reviewed are put through three screenings as listed below. The screenings will look for an overall engine family average or class/engine average equal to or faster than the numbers shown below, based on the number of runs in the database. Runs of .50 and slower are not included in calculating the engine or class/engine averages:

Mulry,
You are amazingly thorough....probably explains why your stuff flies!!!!!!!!!!!

[Bryan Worner]

Originally Posted by RPinoski1

It is clear as a bell in this paragraph. Best run per event.....

Final qualifying and elimination runs of 1.15 seconds or more, under the index, at NHRA national events, with the exception of altitude adjusted tracks, will trigger an automatic review. Only the quickest run of each event is recorded for each competitor. (The engine family combination must make at least two runs of 1.15 or quicker before a review is triggered to prevent a "one time fast run" from triggering the system.) In reviewing runs of 1.15 or more under the index, the database of runs for the engine family combination being reviewed are put through three screenings as listed below. The screenings will look for an overall engine family average or class/engine average equal to or faster than the numbers shown below, based on the number of runs in the database. Runs of .50 and slower are not included in calculating the engine or class/engine averages:

Mulry,
You are amazingly thorough....probably explains why your stuff flies!!!!!!!!!!!

BINGO!!!!! Now what??? Will we all get the horsepower back since they obviously didn't follow their own rules????

[Just Observing]

Some combo's earned the HP even using last seasons AFHS rules. Shouldn't they keep their HP factor additions?

[Bryan Worner]

Originally Posted by Just Observing

Some combo's earned the HP even using last seasons AFHS rules. Shouldn't they keep their HP factor additions?

Yes they should, but the ones that didn't trigger a review according to the rules should have the horespower adjustments cancelled!!!