Vivid Racing - Agency Power Dyno Runs Part III - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

celica73 · 07-28-2012, 07:44 AM

Generally dynoing in a lower gear will accentuate the "power" gain of a lighter rotating part (flywheel, pulley). If the dyno run is too short you start to lose resolution (assume a fixed data sampling rate, so less time = less data). On the other hand, if you take too long there might be drift, extra wear and tare on the engine, etc.

Back when I cared about this stuff, we always dynoed in 4th gear because it was 1-1. In the case of the BRZ that would be 5th gear.

I don't know if there is a wrong or better answer. You can't compare numbers that you get in different gears, so just make sure you do it the same way every time.

Scott

2forme · 07-28-2012, 08:27 AM

Great job Mike. Very thorough.

kwood9000 · 07-28-2012, 08:56 AM

Mike, appreciate the extra effort to prove the designs out.

I'm new to this stuff, so I might be asking dumb questions.

Anyway, does the light-weight pulley add any gains? If so, do you plan on doing a run without the low weight pulley so we can just see the impact of just the exhaust system?

Also, I didn't see all the component weights. Might want to consider adding a table of weights to show the differences in stock vs. AP components.

Opposed · 07-28-2012, 09:04 AM

Quote:

Originally Posted by kwood9000

Mike, appreciate the extra effort to prove the designs out.

I'm new to this stuff, so I might be asking dumb questions.

Anyway, does the light-weight pulley add any gains? If so, do you plan on doing a run without the low weight pulley so we can just see the impact of just the exhaust system?

Also, I didn't see all the component weights. Might want to consider adding a table of weights to show the differences in stock vs. AP components.

Pulley's should not "show" any gains on a dyno. He has pictures of the pulley, header, and crosspipe weights stock vs AP components.

TouchMyHonda · 07-28-2012, 09:09 AM

Awesome. Thank you.

brichard0625 · 07-28-2012, 09:12 AM

WOW! Good Sh!t...with a nice tune and an intake added this car should hit at least 225hp 165tq with some cooler weather and 93 octane....

mickey177 · 07-28-2012, 09:28 AM

Thank you Vivid racing so much for doing this!!!!!! I really appreciatted you for going through all that trouble. But I just have 2 question to ask. Is there anyway I can get a different exhaust tip or can it be a little shorter(seems to stick out a bit)?and will this exhaust system pass my local emission's testing? I am planning on purchasing an exhaust system in the next serveral weeks. Just trying to narrow down and pick the best one.

CoRi J · 07-28-2012, 09:35 AM

For me it was pretty much the you had me at hello from the first thread because I just like the way the exhaust looks, sounds, and the fact it's a full exhaust system. :happy0180:

Thanks for the extra hard work you guys put through with dishing out some numbers. We'll be in touch when I'm ready to get my exhaust system

TSLRich · 07-28-2012, 09:43 AM

This is a well put together thread... the information is easy to read and understand and very thorough.

Enigmus · 07-28-2012, 09:56 AM

Videos of flyby please. Does the exhaust package include the crosspipe?

Dimman · 07-28-2012, 09:59 AM

Quote:

Originally Posted by Opposed

Pulley's should not "show" any gains on a dyno. He has pictures of the pulley, header, and crosspipe weights stock vs AP components.

Reduced rotating mass WILL show gains on acceleration pulls.

For a better picture of what the over-pipe and header are gaining, they should have dyno'd them after the cat-back, then added the pulley after. So we still don't know out of the second gains how much is from reduced rotating mass cutting losses and how much is the header and overpipe making power. However in June they said they saw 6-7 from the header, but no graph at the time.

I don't think we'll get any better than this from them.

It's sad that it's been dragged out to 4 threads, when all it would've taken was a "Holy shit we forgot the flywheel and pulley were still on!!! Pull the dynosheet and edit the first page!" when I brought up the potential in the first thread.

Be more careful in the future.

colHolm · 07-28-2012, 10:07 AM

I think this thread sets a new standard for product information threads. The development threads are a great read, but get muddied really fast. I hope this kind of post becomes mandatory for products as they become available for retail sale.

Cheers!

Also, not sure if I missed it somewhere, but do you have the total net weight savings of the full header/exhaust system vs. stock?

ichitaka05 · 07-28-2012, 10:11 AM

Good job!

track_warrior · 07-28-2012, 10:12 AM

Wow 200whp from bolt ons!! Cant wait to see what this car will do with cams + tuning.

Great job AGP / VIVID RACING

07-28-2012, 10:11 AM	#27
ichitaka05 Site Moderator Join Date: Oct 2009 Drives: ichi 86 Project Location: Middle of No where Posts: 20,974 Thanks: 7,672 Thanked 19,094 Times in 8,333 Posts Mentioned: 678 Post(s) Tagged: 27 Thread(s)	Good job! __________________

07-28-2012, 10:12 AM	#28
track_warrior Track Junkie Join Date: Mar 2012 Drives: Faster than the Stig! Location: TX Posts: 1,338 Thanks: 530 Thanked 770 Times in 363 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Wow 200whp from bolt ons!! Cant wait to see what this car will do with cams + tuning. Great job AGP / VIVID RACING __________________ Compensating a heavy car with horsepower is like giving an alcoholic cocaine to sober him up...

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07-28-2012, 07:44 AM	#15
celica73 Senior Member Join Date: Jun 2012 Drives: '13 BRZ / '11 Outback / '06 Tundra Location: Durham NC Posts: 510 Thanks: 6 Thanked 155 Times in 104 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Generally dynoing in a lower gear will accentuate the "power" gain of a lighter rotating part (flywheel, pulley). If the dyno run is too short you start to lose resolution (assume a fixed data sampling rate, so less time = less data). On the other hand, if you take too long there might be drift, extra wear and tare on the engine, etc. Back when I cared about this stuff, we always dynoed in 4th gear because it was 1-1. In the case of the BRZ that would be 5th gear. I don't know if there is a wrong or better answer. You can't compare numbers that you get in different gears, so just make sure you do it the same way every time. Scott

07-28-2012, 08:56 AM	#17
kwood9000 Senior Member Join Date: Apr 2012 Drives: Limited WRB AT6 BRZ Location: Atlanta, Ga Posts: 371 Thanks: 993 Thanked 86 Times in 59 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Mike, appreciate the extra effort to prove the designs out. I'm new to this stuff, so I might be asking dumb questions. Anyway, does the light-weight pulley add any gains? If so, do you plan on doing a run without the low weight pulley so we can just see the impact of just the exhaust system? Also, I didn't see all the component weights. Might want to consider adding a table of weights to show the differences in stock vs. AP components.

07-28-2012, 09:09 AM	#19
TouchMyHonda Vtec Jesus Join Date: Jul 2012 Drives: 13 BRZ, 13 Golf R, 15 Audi S4 Location: LSD Posts: 1,165 Thanks: 623 Thanked 243 Times in 153 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Awesome. Thank you.

07-28-2012, 09:12 AM	#20
brichard0625 Senior Member Join Date: Jun 2012 Drives: 2013 Scion Frs(Scarlet) Location: Bronx, NY Posts: 907 Thanks: 172 Thanked 386 Times in 177 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	WOW! Good Sh!t...with a nice tune and an intake added this car should hit at least 225hp 165tq with some cooler weather and 93 octane....

07-28-2012, 09:28 AM	#21
mickey177 Senior Member Join Date: Apr 2012 Drives: Whiteout AT Location: austin, tx Posts: 233 Thanks: 10 Thanked 24 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you Vivid racing so much for doing this!!!!!! I really appreciatted you for going through all that trouble. But I just have 2 question to ask. Is there anyway I can get a different exhaust tip or can it be a little shorter(seems to stick out a bit)?and will this exhaust system pass my local emission's testing? I am planning on purchasing an exhaust system in the next serveral weeks. Just trying to narrow down and pick the best one.

07-28-2012, 09:43 AM	#23
TSLRich Member Join Date: Jul 2012 Drives: FJ Cruiser Location: NJ Posts: 85 Thanks: 13 Thanked 13 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	This is a well put together thread... the information is easy to read and understand and very thorough.

07-28-2012, 09:56 AM	#24
Enigmus Senior Member Join Date: Feb 2012 Drives: 1996 Integra LS 4DR, 2013 Scion FRS Location: New Orleans Posts: 191 Thanks: 6 Thanked 269 Times in 47 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Videos of flyby please. Does the exhaust package include the crosspipe?

07-28-2012, 10:07 AM	#26
colHolm Default User Title Join Date: Mar 2011 Drives: FR-S Location: Whitby, ON Posts: 685 Thanks: 180 Thanked 343 Times in 117 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	I think this thread sets a new standard for product information threads. The development threads are a great read, but get muddied really fast. I hope this kind of post becomes mandatory for products as they become available for retail sale. Cheers! Also, not sure if I missed it somewhere, but do you have the total net weight savings of the full header/exhaust system vs. stock?

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