National Staff Greg G. Posted December 7, 2017 National Staff Share Posted December 7, 2017 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 Quote Link to comment Share on other sites More sharing options...
427R Posted January 2, 2018 Share Posted January 2, 2018 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 Quote Link to comment Share on other sites More sharing options...
Rob S. Posted January 2, 2018 Share Posted January 2, 2018 - 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. Quote Link to comment Share on other sites More sharing options...
427R Posted January 2, 2018 Share Posted January 2, 2018 (edited) 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. Edited January 4, 2018 by Guest Quote Link to comment Share on other sites More sharing options...
National Staff Greg G. Posted January 3, 2018 Author National Staff Share Posted January 3, 2018 - 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. Quote Link to comment Share on other sites More sharing options...
Rob S. Posted January 3, 2018 Share Posted January 3, 2018 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. Quote Link to comment Share on other sites More sharing options...
OffsetMotorwerks Posted January 4, 2018 Share Posted January 4, 2018 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. Quote Link to comment Share on other sites More sharing options...
Rob S. Posted January 4, 2018 Share Posted January 4, 2018 I agree......brain affected by this damn cold weather!! Quote Link to comment Share on other sites More sharing options...
zdr93523 Posted January 9, 2018 Share Posted January 9, 2018 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. Quote Link to comment Share on other sites More sharing options...
OffsetMotorwerks Posted January 15, 2018 Share Posted January 15, 2018 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 Quote Link to comment Share on other sites More sharing options...
OffsetMotorwerks Posted January 15, 2018 Share Posted January 15, 2018 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 Quote Link to comment Share on other sites More sharing options...
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