HP adjustments after the Dutch - posted

[Randall Klein]

20 MPH tailwind AT Topeka!

I believe you, Larry, I think

Musta missed that one

[Ed Wright]

Originally Posted by Randall Klein

20 MPH tailwind AT Topeka!

I believe you, Larry, I think

Musta missed that one

Been a head wind every time I've been there. :-)

[Lyn Smith]

It can be a headwind one day,tail the next.I have witnessed cars picking up 2 tenths from one day to the next!!!

[Bob Moulton]

I can't believe that I am the one that is going to bat for a chevy racer!!!!!!! (have run Fords all my life) The racer in question was not randomly torn down. He is a hard working racer who thought he was setting the record with a car that would pass tech. Instead of jumping on the brakes at a 1000' like so many of you, he wanted to set a record! I'm pretty sure that would have been his first record. I'm also pretty sure that his engine builder just made a mistake. I've never met Mr. Tilburg, but I have been beaten by more than one of his engines. That year off thing has always seemed strange to me. Unless you are doing something like nitrous or anything flagrant, it never made sense to me to get kicked out for a year! This used to be a performance based class so getting parked for working in a gray area never made sense to me!!!!!!!! I do believe that anyone who hits a trigger should have to pass a teardown before getting everyone HP. Bob Moulton

[Mark Callanan]

Originally Posted by Bob Moulton

I can't believe that I am the one that is going to bat for a chevy racer!!!!!!! (have run Fords all my life) The racer in question was not randomly torn down. He is a hard working racer who thought he was setting the record with a car that would pass tech. Instead of jumping on the brakes at a 1000' like so many of you, he wanted to set a record! I'm pretty sure that would have been his first record. I'm also pretty sure that his engine builder just made a mistake. I've never met Mr. Tilburg, but I have been beaten by more than one of his engines. That year off thing has always seemed strange to me. Unless you are doing something like nitrous or anything flagrant, it never made sense to me to get kicked out for a year! This used to be a performance based class so getting parked for working in a gray area never made sense to me!!!!!!!! I do believe that anyone who hits a trigger should have to pass a teardown before getting everyone HP. Bob Moulton

Bob

Are you sure he was trying to set the record?
Not a statement but a question?

[Bob Moulton]

We were there and a good friend of mine told me that he went over to him and congratulated him on setting the record and he was like a kid at Xmas!!!! I didn't talk to him myself!!!!!! If anyone knows different, PLEASE chime in.

[gsa612]

Originally Posted by mark callanan

Bob

Are you sure he was trying to set the record?
Not a statement but a question?

Was the record set on the first pass ? on your other runs you can slow the car down 2 tenths then you don,t have the 1% backup therefore no record.. gsa612

[boster]

Where does it say below that you must pass tech to get AHFS, I cant find it anywhere but I might be missing it. What it does say is runs 1.20 under or more get automatic HP the following tuesday .

Automatic Horsepower Factoring System (AHFS) explained
The AHFS is used to review and evaluate runs in Stock and Super Stock for possible horsepower 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 all NHRA National and LODRS events. (At events where class eliminations are run, all runs are included in the AHFS database. Only the first round of class is part of qualifying and therefore is part of the "Q" 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 and LODRS events 1 through 11 and the second period includes runs from events 12 through 22. The following procedure is used in reviewing run data:

Final qualifying, class eliminations, and elimination runs of 1.00 seconds or more, under the index, at NHRA National and LODRS events will trigger an automatic review. (The combination must make at least two runs of 1.00 or quicker before a review is triggered to prevent a "one time fast run" from triggering the system.) In reviewing runs of 1.00 or more under the index, the database of runs for the engine 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 faster than 0.850-second under. Runs of .350 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 faster than 0.850-second under, a change will be initiated.
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 1.114- and 1.187- second under the index, triggering a review. 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 (2 in K/SA and 8 in L/SA) with a total engine average of .845-second under. Because the overall engine average did not hit the required 0.850 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 1.101-second under, therefore surpassing the 0.850-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
1.000-1.099
1.25%
-.05
1.100-1.199
2.25%
-.10
1.200-1.249
3.25%
-.15
(immediate change)
1.250-1.299
4.25%
-.20 (immediate change)
1.300-1.349
5.25%
-.25 (immediate change)
1.350-1.399
6.25%
-.30 (immediate change)
1.400-1.449
7.25%
-.35 (immediate change)
1.450- 1.499
8.25%
-.40 (immediate change)
1.500- 1.549
9.25%
-.45 (immediate change)
1.550- 1.599
10.25%
-.50 (immediate change)
1.600- 1.649
11.25%
-.55 (immediate change)
1.650- 1.699
12.25%
-.60 (immediate change)
1.700- 1.749
13.25%
-.65 (immediate change)
1.750- 1.799
14.25%
-.70 (immediate change)
1.800- 1.849
15.25%
-.75 (immediate change)
1.850- 1.899
16.25%
-.80 (immediate change)
1.900- 1.949
17.25%
-.85 (immediate change)
1.950- 1.999
18.25%
-.90 (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 1.200 or more under the index will be reviewed and adjusted Tuesday following the event. Runs at all NHRA events, including those at altitude factored race tracks, are included in the 1.200-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 horsepower adjustment or index reduction will be initiated Tuesday following the event.
The decision to adjust horsepower or to reduce the index will be at the discretion of the NHRA Tech Department.

In addition to reviews resulting in a horsepower increase, a written request (only one request per competitor, per review period.) will trigger a review for the purpose of a decrease in horsepower factor or index adjustment. The request must include eliminator, year, model, engine size, advertised horsepower, factored horsepower, and class; to be eligible. Incomplete requests will not be reviewed.

The screenings will look for an overall engine family average less than 0.550-seconds under. Runs of 0.100-second under and slower are not included in calculating the engine average:

In addition, the combination must NOT make two runs of 0.650 or quicker for the review to continue or any run 0.850 or quicker.)

Engine family average: The overall engine average for all cars, regardless of class, running the particular engine combination being reviewed is included in this screening. If the engine family average is found to be slower than 0.550-second under, a change will be initiated.

To more clearly illustrate how the AHFS program affects a given combination, the following is a hypothetical evaluation in Stock Eliminator for a 305 cubic-inch, 150 factory rated horsepower, carbureted Camaro during a review period:

A written request triggered a review by the committee. As per the procedure outlined above, there were NOT 2 runs 0.650-second or quicker preventing a review or ANY run 0.850-second or quicker preventing a review. The overall engine average is analyzed next. Upon reviewing the engine average made by the combination, 10 runs had been recorded (2 in I/SA and 8 in J/SA) with a total engine average of 0.535-second under. Because the overall engine average did not hit the required 0.550-second under, the combination proceeds with the evaluation.

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 decrease:

Under Index
Horsepower Decrease
Index Change
0.166-quicker
1.25%
+.05
0.101-0.165
2.25%
+.10

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. The decision to adjust horsepower or to increase the index will be at the discretion on the AHFS Committee.