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PostPosted: Wed Dec 06, 2017 8:15 pm 
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TECHNICAL BULLETIN 12-6-17
Average Horsepower (Avg HP) Calculation


7.2 Average Horsepower Calculation


7.3.3 For vehicles with a redline less than 6000 rpm
and all Forced Induction vehicles:
The three (3) highest data points of the above sixteen (16) will be used in the calculation below:

Avg HP = [Max HP +(sum of the three highest data points)] / 4



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PostPosted: Tue Jan 02, 2018 8:13 am 
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Greg, clarification please.
1. Does the TB 7.3.3 apply to TT or is this just for ST/SU?
2. If it does apply to TT, regarding F/I vehicles, is that just for F/I vehicles with less than 6000 redline, or all F/I vehicles, regardless of redline? Believe the answer is ALL, but asking to be sure I understand clearly.
3. Will a new Dyno Certification Form be coming out or are we just to use the current one on site?

Thanks


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PostPosted: Tue Jan 02, 2018 10:08 am 
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- TT and ST use same rules so it does apply to TT.
- it states all but not sure why. FI is the easiest to manipulate the hp curve and there are definitely FI engines that rev well above 6k rpm.

Greg, what is the reason to use only four hp points for all FI engines? Thank you.

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PostPosted: Tue Jan 02, 2018 11:47 am 
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Yea was pretty sure it applied, was just kinda hoping it would'nt. Did a rough calculation using last years dyno data, under the 4 pt rule my avg. hp, will increase about 10 hp, which means less weight I'll be able to take off car...boo-hiss.


Last edited by 427R on Thu Jan 04, 2018 9:43 am, edited 1 time in total.

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PostPosted: Wed Jan 03, 2018 10:41 am 
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Rob S. wrote:
- TT and ST use same rules so it does apply to TT.
- it states all but not sure why. FI is the easiest to manipulate the hp curve and there are definitely FI engines that rev well above 6k rpm.

Greg, what is the reason to use only four hp points for all FI engines? Thank you.

Rob, you answered your own question. It is the easiest to manipulate.

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PostPosted: Wed Jan 03, 2018 2:14 pm 
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If it’s easily to manipulate, you’d want to take more points to cover a larger range of rpm for the average, not less points. If you agree FI is the easiest to manipulate, “all FI” should be added to 7.2.1 not 7.3.3. What do you think? Thank you.

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PostPosted: Wed Jan 03, 2018 4:14 pm 
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Rob S. wrote:
If it’s easily to manipulate, you’d want to take more points to cover a larger range of rpm for the average, not less points. If you agree FI is the easiest to manipulate, “all FI” should be added to 7.2.1 not 7.3.3. What do you think? Thank you.


Less data points make it harder for FI guys to manipulate their average HP. For example, if you only use a 1500 RPM powerband because of your gearing, you can drop the boost elsewhere to manipulate your average HP calculation. More data points would give them an advantage.


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PostPosted: Wed Jan 03, 2018 5:09 pm 
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I agree......brain affected by this damn cold weather!! :shock:

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PostPosted: Mon Jan 08, 2018 8:43 pm 
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OffsetMotorwerks wrote:
Rob S. wrote:
If it’s easily to manipulate, you’d want to take more points to cover a larger range of rpm for the average, not less points. If you agree FI is the easiest to manipulate, “all FI” should be added to 7.2.1 not 7.3.3. What do you think? Thank you.


Less data points make it harder for FI guys to manipulate their average HP. For example, if you only use a 1500 RPM powerband because of your gearing, you can drop the boost elsewhere to manipulate your average HP calculation. More data points would give them an advantage.



You're correct to an extent. This only makes sense for turbocharged cars, not all FI.


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PostPosted: Sun Jan 14, 2018 4:45 pm 
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zdr93523 wrote:
OffsetMotorwerks wrote:
Rob S. wrote:
If it’s easily to manipulate, you’d want to take more points to cover a larger range of rpm for the average, not less points. If you agree FI is the easiest to manipulate, “all FI” should be added to 7.2.1 not 7.3.3. What do you think? Thank you.


Less data points make it harder for FI guys to manipulate their average HP. For example, if you only use a 1500 RPM powerband because of your gearing, you can drop the boost elsewhere to manipulate your average HP calculation. More data points would give them an advantage.



You're correct to an extent. This only makes sense for turbocharged cars, not all FI.


There are plenty of ways to manipulate boost with a supercharger...

https://www.google.com/search?q=supercharger+boost+controller&rlz=1C1CHFX_enUS591US591&oq=supercharger+boost+controller&aqs=chrome.0.0l6.2848j0j7&sourceid=chrome&ie=UTF-8


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