California Octane - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

RToyo86 · 12-21-2022, 02:14 PM

Quote:

Originally Posted by OkieSnuffBox

Québécois are too busy eating smoked meats to know what's going on.

It's probably the poutines.

Some other data points from a 15 car dyno day with different levels of modification. These are two OEM preface lift cars.
https://www.pointmeby.com/2017/10/18...esults-15-86s/

OkieSnuffBox · 12-21-2022, 03:53 PM

To be fair (2nd reference), anyone who tunes with AFR's looking like that? I'm not really putting any stock into it.

Just leaning it out on the 91 would have yielded some gains, that thing is running pig rich by 5k and is richer than 12:1 near peak. Don't ever let person touch your car.

Pat · 12-21-2022, 03:57 PM

Quote:

Originally Posted by OkieSnuffBox

To be fair (2nd reference), anyone who tunes with AFR's looking like that?

I'd like to see this addressed by a professional tuner. I mean....I doubt it was a mistake. I wonder what their intentions were.

x808drifter · 12-22-2022, 05:43 AM

(in general not for this thread only)
I love how everyone forgets that the variance for a dyno is 3-5ish%.
^ That's back to back the same car the same day the same tune.
That's 6-10WHP at 200 WHP
Something almost nobody looks at or talks about.

Pat · 12-22-2022, 09:24 AM

Something else they don't often think about is variance can be both positive and negative.

OkieSnuffBox · 12-22-2022, 10:48 AM

Quote:

Originally Posted by x808drifter

(in general not for this thread only)
I love how everyone forgets that the variance for a dyno is 3-5ish%.
^ That's back to back the same car the same day the same tune.
That's 6-10WHP at 200 WHP
Something almost nobody looks at or talks about.

Like I said on the previous page, that amount of variance is basically statistical noise.

tomm.brz · 12-22-2022, 11:12 AM

Those afr are probably taken at the exit of axleback so real afr is more than -1 than those

RToyo86 · 12-22-2022, 11:39 AM

Both runs on the graph above are on OEM tunes with different fuel.

Variance is possible +/-. The article suggested all cars did multiple runs and best of was used for the graph

PulsarBeeerz · 12-22-2022, 12:46 PM

Quote:

Originally Posted by x808drifter

(in general not for this thread only)
I love how everyone forgets that the variance for a dyno is 3-5ish%.
^ That's back to back the same car the same day the same tune.
That's 6-10WHP at 200 WHP
Something almost nobody looks at or talks about.

People do talk about it, but rarely back up the statement. The variance can be less than 3% as well. Plenty of YouTube dyno vids show plots laying on top of each other. I dyno'd my old Celica back in the day on a couple different Dynojets in the city. The back to back pulls were with in 3whp or 1.8-2% with SAE correction factors.

CSG Mike · 12-23-2022, 03:36 PM

Quote:

Originally Posted by PulsarBeeerz

People do talk about it, but rarely back up the statement. The variance can be less than 3% as well. Plenty of YouTube dyno vids show plots laying on top of each other. I dyno'd my old Celica back in the day on a couple different Dynojets in the city. The back to back pulls were with in 3whp or 1.8-2% with SAE correction factors.

And that is precisely why CSG posts dynos like this

It's easy for a tuner to cherry pick the best and worst pull *WITH ZERO CHANGES TO THE TUNE* and show a large difference. Even showing cold and hot pulls can show a big difference.

It's also a part of why CSG chooses to use a (far more expensive) dynapack, rather than a roller dyno.

Sapphireho · 12-27-2022, 09:52 AM

Quote:

Originally Posted by finch1750

Doesn't even have to be a rich community. We have one in Stockton lol

Yea, but the one in Saratoga is the most fun to watch from the coffee house next door on the first nice spring mornings and watch the Veyrons and Paganis with their 95 octane minimum fill up.

Ezio · 01-22-2023, 01:44 AM

Didn't see anyone post this:
https://find93.com/

Been fairly handy for me in California. Be sure to call or scout ahead. Not all locations seem to be available or existing.

Also has a blend calculator.

Snoopysvet · 01-23-2023, 10:50 AM

Quote:

Originally Posted by Ezio

Didn't see anyone post this:
https://find93.com/

Been fairly handy for me in California. Be sure to call or scout ahead. Not all locations seem to be available or existing.

Also has a blend calculator.

Thanks

12-21-2022, 03:53 PM	#30
OkieSnuffBox Senior Member Join Date: Aug 2014 Drives: '23 BRZ Limited Location: OKC, OK Posts: 1,986 Thanks: 660 Thanked 1,230 Times in 703 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	To be fair (2nd reference), anyone who tunes with AFR's looking like that? I'm not really putting any stock into it. Just leaning it out on the 91 would have yielded some gains, that thing is running pig rich by 5k and is richer than 12:1 near peak. Don't ever let person touch your car. __________________ "95% of the time, more throttle is the answer. 5% of the time, it ends the suspense."

12-22-2022, 11:39 AM	#36
RToyo86 Senior Member Join Date: Mar 2018 Drives: 17 Asphalt 86 Location: Ottawa Posts: 2,167 Thanks: 1,708 Thanked 2,206 Times in 1,128 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Both runs on the graph above are on OEM tunes with different fuel. Variance is possible +/-. The article suggested all cars did multiple runs and best of was used for the graph Last edited by RToyo86; 12-22-2022 at 11:52 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mixing e85 (109 octane) with e15 (91 octane)	pcguru2000	Engine, Exhaust, Transmission	19	03-08-2022 10:35 PM
91 vs 94 Octane	nocwage	Engine, Exhaust, Transmission	27	07-15-2014 12:52 AM
93 Octane vs 91 Octane	keithgold	Mechanical Maintenance (Oil, Fluids, Break-In, Servicing)	31	01-16-2014 10:16 AM
100 octane race gas: 91 octane ratio?	GhostofAkina	Scion FR-S / Toyota 86 GT86 General Forum	15	02-08-2013 01:23 AM
93 Octane	Smokinbuffalo	Northwest	20	09-02-2012 05:24 PM

12-22-2022, 05:43 AM	#32
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,646 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	(in general not for this thread only) I love how everyone forgets that the variance for a dyno is 3-5ish%. ^ That's back to back the same car the same day the same tune. That's 6-10WHP at 200 WHP Something almost nobody looks at or talks about.

12-22-2022, 11:12 AM	#35
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	Those afr are probably taken at the exit of axleback so real afr is more than -1 than those

01-22-2023, 01:44 AM	#40
Ezio Member Join Date: Apr 2011 Drives: 2022 BRZ Location: Where the Woodbine Twineth... Posts: 30 Thanks: 2 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Didn't see anyone post this: https://find93.com/ Been fairly handy for me in California. Be sure to call or scout ahead. Not all locations seem to be available or existing. Also has a blend calculator.

User Name		Remember Me?
Password