Fuel quality/power increase - Yamaha FZ6 Forums - International FZ6 Motorcycle Community Forum

**wrightme43** · 04-15-2007, 01:02 PM

Basicly the question for us is does our motor have a adaptive ECU. I believe it does but I am going now to hunt up conformation.

It looks to me that this says it can.
The 02 sensor feeds info to the fuel injection system to optimise fuel air mixture for power and emissions.
http://www.motorbike-search-engine.c...amaha_fz6.html

I would like to add that I have always been of the opinion that the fuel that has the lowest octane that will prevent detonation has the highest amount of energy available.
Now that computers are involved changing ignition timing and injection pulse length and at what degree of crank rotation it occurs, maybe this has changed.

**wrightme43** · 04-16-2007, 09:23 PM

Anybody got any thoughts on this? Am I way off base here?
I looked in the owners manual and it says it has been designed to use a fuel with octane of 86 or Higher. I know there is more energy in low octane fuel.
At 12.2 to 1 thats alot of compression for regular fuel.

**wrightme43** · 04-25-2007, 07:19 AM

Nope it should make the most power on lowtest. The compression in a smaller cyl like this doesnt matter the same way it does in bigger car sized cyls.
I think I was wrong. I will keep checking, but the only way to know for sure with this bike would be back to back dyno runs.

**sportrider** · 09-22-2007, 02:14 PM

I know this is an old thread but I just saw it. now I'm rethinking running 87 again!!! wish I had a dyno handy!!!

hobbit · 09-22-2007, 02:20 PM

ok the UK uses different fuel ratings to the US ok we exagerate the ron to make the fuel seem better -have been running the 93/95 unleaded in my Sporty and it has always sounded like a box of bolts in a rusty bin (pinking and back firing) i then put in it 97 superunleaded and it runs sooooooo much better its quieter the pinking is less and the backfirng is now a mellow pop in the pipe, i run BP fuels 90% of the time in the bikes and occasionally a supermarket brand fuel (texaco) i run standard unleaded in the FZ and yes the ECU should adapt to the lower octane fuel same as it does if you fit pipes only

Ferris · 09-23-2007, 06:40 AM

Sadly there are no knock sensors which means it won't retard or advance timing. This is the single reason I run premium fuel, high compression no adaptive timing == rather be safe then sorry.

cobalt · 08-03-2008, 09:51 AM

I have always heard, there's more energy in low octane fuel, as long as you have enough octane to prevent detonation and pinging. However in the last issue of Super Streetbike Magazine an R1 ( I think it was an R1) was dynoed on all 3 (US) grades, with the following findings - 89 was .1 Hp increase over 87, 91 ocatne was .9 horsepower increase over 89.

In Oregon, all gasoline is 10% ethanol, I have read somewhere that ethanol increases the resistance to pinging and detonation, however decreases the energy available gallon to gallon or liter to liter, if you know what I mean.

but without a Dyno run on my bike, I'm not sure exactly how to play it.

any thoughts?

cobalt · 08-03-2008, 09:59 AM

I don't agree with the small motor theory,
I had a CR250 (2 stroke) and rode in the dunes alot,
I found it best to run the octane up to at least 100,

I tend to agree with Ferris

Fred · 08-03-2008, 10:22 AM

http://www.fz6-forum.com/forum/fz6-g...-kind-gas.html (which kind of gas?)

04-15-2007, 01:02 PM	#1 (permalink)
wrightme43 Super Sock Puppet Moderator Join Date: Apr 2007 Location: Bowling Green KY Bike: 07 FZ6 in Blue. Posts: 4,906 Rep Power: 71 Member #42	YouTube - 5th Gear Report Fuels and BHP Basicly the question for us is does our motor have a adaptive ECU. I believe it does but I am going now to hunt up conformation. It looks to me that this says it can. The 02 sensor feeds info to the fuel injection system to optimise fuel air mixture for power and emissions. http://www.motorbike-search-engine.c...amaha_fz6.html I would like to add that I have always been of the opinion that the fuel that has the lowest octane that will prevent detonation has the highest amount of energy available. Now that computers are involved changing ignition timing and injection pulse length and at what degree of crank rotation it occurs, maybe this has changed. __________________ “Yes, socialism does not work, and they do not want it to work, because the less it works, the more government is needed. ” Last edited by wrightme43; 04-15-2007 at 06:05 PM.. Reason: All posts belong together.

04-16-2007, 09:23 PM	#2 (permalink)
wrightme43 Super Sock Puppet Moderator Join Date: Apr 2007 Location: Bowling Green KY Bike: 07 FZ6 in Blue. Posts: 4,906 Rep Power: 71 Member #42	Anybody got any thoughts on this? Am I way off base here? I looked in the owners manual and it says it has been designed to use a fuel with octane of 86 or Higher. I know there is more energy in low octane fuel. At 12.2 to 1 thats alot of compression for regular fuel. __________________ “Yes, socialism does not work, and they do not want it to work, because the less it works, the more government is needed. ”

04-25-2007, 07:19 AM	#3 (permalink)
wrightme43 Super Sock Puppet Moderator Join Date: Apr 2007 Location: Bowling Green KY Bike: 07 FZ6 in Blue. Posts: 4,906 Rep Power: 71 Member #42	Nope it should make the most power on lowtest. The compression in a smaller cyl like this doesnt matter the same way it does in bigger car sized cyls. I think I was wrong. I will keep checking, but the only way to know for sure with this bike would be back to back dyno runs. __________________ “Yes, socialism does not work, and they do not want it to work, because the less it works, the more government is needed. ”

09-22-2007, 02:14 PM	#4 (permalink)
sportrider Freeway Assassin Join Date: May 2007 Location: Redlands Ca.(can't see hell anymore) Bike: 2007 Yamaha YZFR1 Posts: 2,631 Rep Power: 10 Member #127	I know this is an old thread but I just saw it. now I'm rethinking running 87 again!!! wish I had a dyno handy!!! __________________ My Rider Resume America LOVE it or LEAVE IT former FZ6 test rider much of the action depicted here could rip your limbs off if done improperly.the riding discussed is done by an experianced rider in semi-controlled conditions, save the speed for the track. ride within your capibilities, concentrate and always wear protective gear, including a helmet, gloves, jacket, pants, and boots. I and the forum, forum staff, any combination of the words, forum, staff, thread, post, website, internet or member, are in no way responsible if you ride over your head and wad yourself up trying to recreate something you've read here.

09-22-2007, 02:20 PM	#5 (permalink)
hobbit Short fat and hairy :)))) Join Date: Aug 2007 Location: Birmingham, England Bike: 07' FZ6 S2, 05' vstar1100, 06' HD 1200sportster Posts: 165 Rep Power: 6 Member #432	ok the UK uses different fuel ratings to the US ok we exagerate the ron to make the fuel seem better -have been running the 93/95 unleaded in my Sporty and it has always sounded like a box of bolts in a rusty bin (pinking and back firing) i then put in it 97 superunleaded and it runs sooooooo much better its quieter the pinking is less and the backfirng is now a mellow pop in the pipe, i run BP fuels 90% of the time in the bikes and occasionally a supermarket brand fuel (texaco) i run standard unleaded in the FZ and yes the ECU should adapt to the lower octane fuel same as it does if you fit pipes only __________________ not riding fast just flying low

09-23-2007, 06:40 AM	#6 (permalink)
Ferris Member Join Date: Aug 2007 Location: NJ Bike: 07 FZ6 Posts: 43 Rep Power: 5 Member #409	Sadly there are no knock sensors which means it won't retard or advance timing. This is the single reason I run premium fuel, high compression no adaptive timing == rather be safe then sorry.

08-03-2008, 09:51 AM	#7 (permalink)
cobalt Cobalt '08 Join Date: Jun 2008 Location: coos bay,or Bike: fz6 '08 Posts: 11 Rep Power: 0 Member #3148	Re: Fuel quality/power increase I have always heard, there's more energy in low octane fuel, as long as you have enough octane to prevent detonation and pinging. However in the last issue of Super Streetbike Magazine an R1 ( I think it was an R1) was dynoed on all 3 (US) grades, with the following findings - 89 was .1 Hp increase over 87, 91 ocatne was .9 horsepower increase over 89. In Oregon, all gasoline is 10% ethanol, I have read somewhere that ethanol increases the resistance to pinging and detonation, however decreases the energy available gallon to gallon or liter to liter, if you know what I mean. but without a Dyno run on my bike, I'm not sure exactly how to play it. any thoughts?

08-03-2008, 09:59 AM	#8 (permalink)
cobalt Cobalt '08 Join Date: Jun 2008 Location: coos bay,or Bike: fz6 '08 Posts: 11 Rep Power: 0 Member #3148	Re: Fuel quality/power increase I don't agree with the small motor theory, I had a CR250 (2 stroke) and rode in the dunes alot, I found it best to run the octane up to at least 100, I tend to agree with Ferris Last edited by cobalt; 08-03-2008 at 10:03 AM..

08-03-2008, 10:22 AM	#9 (permalink)
Fred M em b er e d Join Date: Nov 2007 Location: Austin, TX Bike: 92 K75 Turbo, 07 Yamaha FZ6, Custom chopper (Pocketbike rear end, K75 front end.) Posts: 840 Rep Power: 25 Member #872	Re: Fuel quality/power increase http://www.fz6-forum.com/forum/fz6-g...-kind-gas.html (which kind of gas?) __________________ I don't know anything about motorcycles, but I just love little kittens. 1990 BMW K75 Turbo (Eternal project bike) 2007 Yamaha FZ6 (Modifications: Stebel Nautilus horn, Valentine 1 hardwired with remote display and audio, Mix-It sound mixer modified for hidden installation, Mayer saddle, true dual high/low headlights. Relay, fuse panel and lockdown blocks for all additional wiring.)

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