So I just picked up a FireNIce Aerocharger Turbo kit which is intercooled, and needless to say... I'm stoked! But I have some questions as far as proper fuel mix goes. I am wanting to run around 10 psi day in and day out, I have heard that I can get away with running pump gas with about 2 gallons race gas mixed in. Also wondering about running AV gas? Any input? Thanks!
Fuel Reccomendations
- Thread starter speedemon
- Start date
somebody posted something last year that they were havng problems and it turned out to be too much race fuel for the boost they were running. i cant remember what the symptoms were that led to the diagnosis though
AV gas and 110 race gas are only abuout 2 MON points different ..
100LL AV is 104 MON
110 Sunoco/VP are 105/106 MON.
The Race gas will give a bit better throttle response .... but in a mix type situation, you wont notice the difference..IMO
This is a hot topic...
100LL AV is 104 MON
110 Sunoco/VP are 105/106 MON.
The Race gas will give a bit better throttle response .... but in a mix type situation, you wont notice the difference..IMO
This is a hot topic...
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K
Kestrel2126
Well-known member
Mountain Horse brings up a good point, that is easily looked over. The MON (motor octane number rating) is the only # that matters. Not sure why any of the fuel companies even use the Research Octane Rating averaged with the MON, to come up with the name of the Fuels. No one I know, burns race gas in a lab for the heck of it. That said, pay attention to the MON!
I would suggest starting out using straight 110 and get the sled running where you are happy with it, and confident that you have no motor issues (detonation particularly). After that, you can start weaning out some of the race gas. i.e. run a tank of 7.5 gal race and 2.5 gal premium. See how the sled performs, and check plugs, piston wash, etc. periodically through the tank. Obviously, if you have concern that something is wrong, go back to more Race Gas.
Running full race gas is going to do nothing other than possibly kill spark plugs a little faster (use the iridium plugs and won't be as much of an issue). It is true, that using more race gas than you actually need, will make your engine perform slightly worse than if you run the exact perfect octane for your motor, elevation, conditions, etc. but ever so slightly. THis is snowmobiling, not drag racing. The Parameters change constantly while riding. I personally use full race fuel. That gives me the peace of mind to be able to go to a higher boost pressure without worry, and peace of mind that I am not damaging my motor.
I also understand that the stuff is expensive, so if that is the main reason, than maybe try slowly weaning it down like I suggested earlier. I would be surprised if anything below about 50/50 doesn't harm your engine, though. I have heard a few on here say they run a gallon or two of RG per tank, but that seems very risky to me.
Good luck, hope everything works out for you!
I would suggest starting out using straight 110 and get the sled running where you are happy with it, and confident that you have no motor issues (detonation particularly). After that, you can start weaning out some of the race gas. i.e. run a tank of 7.5 gal race and 2.5 gal premium. See how the sled performs, and check plugs, piston wash, etc. periodically through the tank. Obviously, if you have concern that something is wrong, go back to more Race Gas.
Running full race gas is going to do nothing other than possibly kill spark plugs a little faster (use the iridium plugs and won't be as much of an issue). It is true, that using more race gas than you actually need, will make your engine perform slightly worse than if you run the exact perfect octane for your motor, elevation, conditions, etc. but ever so slightly. THis is snowmobiling, not drag racing. The Parameters change constantly while riding. I personally use full race fuel. That gives me the peace of mind to be able to go to a higher boost pressure without worry, and peace of mind that I am not damaging my motor.
I also understand that the stuff is expensive, so if that is the main reason, than maybe try slowly weaning it down like I suggested earlier. I would be surprised if anything below about 50/50 doesn't harm your engine, though. I have heard a few on here say they run a gallon or two of RG per tank, but that seems very risky to me.
Good luck, hope everything works out for you!
What sled is it?
Base compression does make a difference in octane is why I ask.
Straight 110 at 10 psi is way overkill in my opinion.
I have been running my 02 at 8psi on 50% avgas with 0 detonation, and I have had it apart and inspected it. Ridden as low as 3500ft.
Base compression does make a difference in octane is why I ask.
Straight 110 at 10 psi is way overkill in my opinion.
I have been running my 02 at 8psi on 50% avgas with 0 detonation, and I have had it apart and inspected it. Ridden as low as 3500ft.
The ride is an 09 Dragon 800 with the 163 track. The Turbo kit is an Aero 66 kit with a water-to-air intercooler. Stock Gearing. Lots of vents from Paul @ FireNIce. The fuel controller is the Attitude box. Paul said they had it set up perfect for 10psi on straight 110 race gas. After talking with him, I believe I am going to be running straight race gas, I don't want to chance it. A drum of Race gas is $400 or so, and a motor rebuild is much more than that! Better safe than sorry!
I would run it just like Paul had it set up. You know on a turbo setup once you get it dialed they work great! Put some race gas in that baby and rip it!
That's about $72 per ride, if you empty your tank every ride, with a turbo that is not very hard. I would say if you want to run staight 110 why not get your money's worth and bump the boost up??? To me this hobby/lifestyle of snowmobiling is already expensive enough, why not save where you can, but be on the safe side. Get your fuel octane level right for your application and you could save enough to buy some pistons, throttle body boots, reeds, clutch parts, or other items needed to keep the sled in prime running condition.
just my 2 cents, take it or leave it.
just my 2 cents, take it or leave it.
I would run it just like Paul had it set up. You know on a turbo setup once you get it dialed they work great! Put some race gas in that baby and rip it!
I would run it just like Paul had it set up. You know on a turbo setup once you get it dialed they work great! Put some race gas in that baby and rip it!
M
MDiver
New member
If you spend the money on a sled and a turbo, I would just run the race gas and crank the boost. A large amount of money has already been spent to get you to this point. None of us ride as much as we like, run full race gas, turn up the boost and really enjoy the limited amount of riding that we have.
Of course this is just my $.02
Of course this is just my $.02
H
Holomis International
Well-known member
I ran an 08 M8 with an aerocharger turbo on straight AV gas last year at 10.5lbs boost. It ran perfect, no det., do yourself a favor and put a dual EGT gauge on so you can really see what your motor is doing. IMO the EGT gauge is one of the most overlooked gauges on turbo installs, the EGT lets you know if your going to burn up or not, keep that gauge happy and you won't be replacing pistons, other then for maintenance.
I just cut and pasted racinstations response to affirm doing what the previous owner recommended. After a lot of reading, it appears that on these forums, the consensus it that about 10lbs at either 50/50 race or straight av gas is working. According to Mountainhorse, av fuel is in the 104 motor octane range and may be able to stand a little more boost than a 105/106 motor octane race fuel/91-92 pump mix.
I am thinking run the fuel recommended and then play after that if you are prepared to pay because of something unforeseen.
I am thinking run the fuel recommended and then play after that if you are prepared to pay because of something unforeseen.
