Race gas. What's the sknny?
Posted January 04, 2002 - 07:42 AM
Posted January 04, 2002 - 11:02 AM
Posted January 04, 2002 - 11:04 AM
Posted January 04, 2002 - 11:09 AM
01 wr-426 runs much, much better...well worth the time it takes to go buy race gas and mix it...
Posted January 04, 2002 - 12:51 PM
I have run this mix in my WR for the last 12 months with zero side effects. I recently had a friend bum a hit off my fuel can....before he returned to the trailer he was amazed at the snap the fuel alone brought out of his DRZ.
I'm happy with it.
Posted January 04, 2002 - 01:34 PM
Posted January 05, 2002 - 05:43 AM
Posted January 06, 2002 - 04:41 AM
IF you decide to run race fuel, you should compensate for it and stick with it. Otherwise, you may very well be better off using a good quality pump gas (Amoco premium, etc) and sticking with that.
Posted January 06, 2002 - 07:40 PM
I like to run race gas because of the consistency. As you know, living in wonderful So. Cal., we are subject to many additives to our gasoline. Within the last couple of months, the highest octane we can get is 91. Just because the pump says 91 octane, that isn't always what you get. The bikes will run on pump gas but.....you get what you pay for.
I run Unocal 76--110 octane (the official fuel of Nascar) which is very similar to VP C-12 in all critical areas. It is usually a bit cheaper than C-12. The lead in race gas helps to buffer the valve train.
Jetting changes are usually required (leaner) when running race gas. If you don't re-jet you are not gaining the full potential of using the race gas.
All of this nonsense about race gas being no good for the pumper carbs or the fourstroke engines is foolish. I have used race gas in my YZ-F's since I got my first one at the end of 97. I have never had any problems with my carbs. Does Timmy Ferry run pump gas???...I don't think so!!
Posted January 06, 2002 - 09:44 PM
Do I notice a big difference? Other then the price - No - but it is all I've ever run it the beast. After messing with the jetting to acheive some form of JD/Taffy spec's - my bike runs crisp, clean, and strong. I wouldn't change.
A good racing fuel out of 5 gallons cans (don't buy the bulk stuff) is just very consistant tank to tank. You won't get that out of the pump. Don't get me wrong - there are lots of fast thumpers out there running pump gas, but why not pop for the best??
I would not use additives.....however - too many varibles, and I've read some well versed engineering opinions that are very set againist them. My $.02.
Posted January 07, 2002 - 04:59 PM
I am sure the jetting is different as octane increases. I am convinced the power is also better. I just don't know how much. It would be interesting to know if someone finds any dyno results, etc by race gas suppliers.
Posted January 07, 2002 - 08:02 PM
Just my 2 peso's.......thanks for tolerating me!
Posted January 07, 2002 - 08:57 PM
Originally posted by yzernie:
Does Timmy Ferry run pump gas???...I don't think so!!
Good point. I usualy have VP C12 and or 76 around for my PWC. They both run very well. I have even used VP unleaded 103 in my WR and found it ran/ started great. I haven't messed with the jetting. It's still @ the stock settings. Any tips on what i should be running it at?
Posted January 07, 2002 - 09:50 PM
Posted January 07, 2002 - 10:56 PM
Posted January 08, 2002 - 05:26 PM
I did have to lean the jetting just a tad, but doing this is no major ordeal. Most of us have to change jetting for changing outside temps anyway.
Cost? Not even a concern with me. Not because I have a lot of money, but because I want the highest quality fuel I can get. Forest Gump would say that pump gas is like a box of chocolates.....you never know what you're gonna get. With race fuel you do.
Posted January 12, 2002 - 10:24 PM
Posted January 13, 2002 - 12:59 AM
1. Consistant Octane and quality. Unless you have a good supplier that has a good turnover of premium unleaded fuel, then race gas may help to maintain consistent running from one tankful to another.
2. Timing. Race gas gives you the ability to advance your ignition timing to take advantage of the higher octane and therefore run a richer mixture and thus have more energy released from the denser charge to push the piston down, with more power at the wheels as a result.
3. Density of mixture. Related to the above #2. If you can cram more fuel/air in the correct proportions into the combustion chamber and ignite it at the optimum point, then you will get some more power. Race fuel is more energy dense.
Both 2 and 3 above need work such as jetting and a modifiable ignition to realise the full potential. The full potential will be a few horsepower, and most of the riders out there would be better off spending their race fuel money on fitness classes or suspension tuning to get a better 'performance' boost, one that will be seat-of-the-pants noticeable.
Sure, if you have a lot of money and time, you might like to dabble, but then why not get some trick EFI setup and you will surely have more potential to increase noticeable horsepower. You could also experiment with alchohol blends and that will be cheaper and provide similar 'benefits'... Besides, consider that the 2 or 3 hp gain you work so hard to get is only at high revs, you may get 1/2 hp down low... If you spend your time desert racing it may be good, but around a track or on a trail, how could you tell?
The WR has a high compression of 12.5:1, but Premium unleaded is more than sufficient. Save your money and buy more stickers or something else proven to make you bike go faster...
[ January 13, 2002: Message edited by: yamaha.dude ]
Posted January 13, 2002 - 06:46 PM
The octane is 110.
Posted January 13, 2002 - 08:31 PM
Try this article if you want to learn about race gas vs. pump gas. Listen to MX Tuner & yamadude. Octane does not equal horsepower. Octane is only to stop denotation. If your bike does not denotate on pump gas, then it's ok. You only get a benefit if you change the jetting and timing. Save your money. Have your suspension revalved instead.