Discussion in 'Tech' started by 05Yamabomber, Dec 1, 2020.
Does anyone use U4 anymore
If you're changing maps when you change fuel, then it does! The advantage of oxygenated fuels is that the extra oxygen in the fuel allows you to burn more fuel per cycle. The oxygen itself doesn't add power, it lets you add more fuel - which adds more power. MR12 has an oxy content of 8.7% so you should theoretically burn through 8.7% more MR12 compared to a non-oxygenated fuel.
If you're not switching maps when you switch fuels, however, then you're most likely just feeling the placebo effect consumption-wise
Chris, you mind telling him how much more fuel he will use over MR-12 if the O2 content of CHP+ is 18%, please? LoL
Watch your mouth! I dont want to hear it lol... Yikes. 8% compared to 18%? I better buy more pales.
Have you considered U4.4 ? It’s potent but not as bad as MR12. Also much cheaper in comparison. I still drained and ran pump gas after race events, just to be safe.
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Yes I was using U4.4 and it killed my fuel pump after one week. I am committed to CHP+, so we shall see once its tuned.
define "killed my fuel pump". was the screen replaced that season? i think it would be a coincidence and not the cause
Just died. First time using race gas in the bike. Just bought it and built the bike. The gas tank leaks gas (pour) when i disconnect. Fuel pump doesnt build pressure. I was told to replace the orings. I pour gas in T-bodies it fires up. Working on getting the pump fixed.
I work by a local airport...
I had them fill up a jug of 100LL av-gas.
100 octane with low lead content.
Or I just fill up with good pump gas.
Our local airport will NOT pump gas for anyone/anything. They'll show you the pump, talk you through using it, but that's it, you have to do it yourself.
100LL is a beautiful thing. Cheapest ethanol free gas you can buy, atleast that I know of. Use it in almost all the yard equipment. Never have to worry about fuel stabilizer or if it will start in the spring.
U4.4 is best bang for buck. MR12 is best power increase. i have no idea what that other fuel is, but i'm curious why i haven't heard of it, if it somehow, will make MORE power than MR12... U4.4 didn't destroy your fuel pump, doubt it. I know a lot of guys that run that stuff, and MR12, and yes, with most any race fuel, you should consider chasing it with pump gas to clean your system. Mr12 leaves a horrible power residue on exhaust ports/valves of an R6. every ... single... time... No getting around it. Chasing with pump gas and fogging the motor afterward REALLY helps, but even doing this religiously every weekend after racing, we still get some powdery build up on exhaust ports/valves. It's just what it is. If someone comes up with a way to add 6+HP to my bikes short of mr12? i'm willin to try ..
I usually use Pump in my R6 for practice, and MR-12 for race day. The bike really comes alive on MR-12. (dual maps)
As far as draining it and chasing with pump gas, it's highly recommended as others have said- but it doesn't gum stuff up as bad as it used to. They changed the formula a few years back.
U4.4 is higher octane than MR-12, and is designed for higher compression engines. It makes more power than Pump, but not all that much more. And it's still $90 a can vs. $120 for MR-12.
@MELK-MAN what is this fogging procedure you speak of? Does Squirting WD-40 into the throttle bodies count?
Well, the first dyno run using 110 octane bike did 115hp on dyno.
I installed air filter, Graves Velocity stacks, and ran CHP+ gas and now I am at 124hp on the dyno run. Im happy. I get CHP+ for $75 a pail. MR12 is $140 a pail.
As stated previously I thought the race gas destroyed my oring in my fuel pump. I think the bike was bouncing in back of the trailer hard enough to jossle the internal fuel pump loose and when I took it apart I damaged orings.
we use fogging oil in a spray can.. with air box lid off, spray right into the throttle bodies. can't fog too much at once, or it can hydro lock the motor, but spray a bit into each cyl holding a low rpm. back and forth over each cylinder, then once you see some good smoke coming from exahst, just kill the engine real quick. i'm not sure what it does to the spark plugs, but we havn't had much trouble and i change plugs a couple times a season. but this seems to have helped with the crystalizing that happens on the exhaust valves..
SS Engine, stacks, Graves exhaust, flash, and PCV
Get a brand new fuel pump at Motosport for $239. I can barely find used fuel pumps for that price for my R1.
My dealer also couldn't find part numbers to replace the orings in the pump.
Buy a new pump
Depending on your dyno, that seems right in line for a SS build R6. I believe mine made 118 on pump and 123 on MR-12.
Does anyone besides VP make an unleaded pump gas alternative? The T4 is great but $80 for five gallons of basically pump gas is tough to swallow. Just looking for a clean ethanol free fuel with a decent shelf life.
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