Anyone run this on a carburated bike? I have an 02R6 and am considering runnig it. What are the HP gains, what kind of jetting issues can I espect? I planned on getting my carbs sync'd, run dyno, add VPU4 rejet and re dyno and go from there...just looking for a heads up if anyone runs the same bike. I'd hate to go through all that testing and tuning to see minimal gains. any thoughts?
performance mods are Yosh carbon slip on, factory jet kit... thats it
thanks!!
Tim
As tested in Sportrider mag, VPU4 gives the best HP numbers for any other race fuel that they tested. Each bike is different, but some guys with R6s can get you in the ball park. I ran it last year in my carbed SS legal SV but this year Im doing some motor work and the compression will be too high to run U4, u4 is 89 octain and is better for SS motors.
I run it on a carberated 02 Kawi 600, much crisper throttle response. Just ensure you jet it using the U4.
I race an '02 R6 and really like the U4, I can tell a pretty big difference. I'm pretty sure it's 92 octane, not 89. I don't know where you race, but Robb at Lithium Motorsports sells it for the GP/MW regions and he could tell you more about it.
Call him at 712-546-7747
This is what his website has it listed as:
U4 is used in stock and modified 4-stroke applications, as well as stock 2-strokes. Makes up to 6% more power than pump gas and any basic nonoxygenated racing fuel. Passes fuel rules for AMA amateur racing and is also perfect for club level racing, CCS, WERA and AFM. • Color: Clear • Motor Octane: 92 • Specific Gravity: .718 at 60° F
thanks for the heads up, once he's back from vegas I'll give him a call.
Tim, what's up? I ran U4 in my R6. Unfortunately, I never ran anything else, except at one track day. I also have an Ivan's Jet Kit, which I think is the best. The resulting power curve from that kit was amazingly smooth and just kept on rising.
I've got R6 carbs with the Ivan's kit for sale.
hey moto, thanks for the heads up! I have got a pretty darn good tuner here, the work he did rejetting the factory kit was phenomenal!! I think I'll just stick with what I have, dont want to be broke prior to the season starting! If he cant work out the tuning I'll just run without it... but he's pretty strong. With just the pipe and jet on my 02, no ram air he's got me tuned to 106-107... if the U4 can get me to 111-112 I'll be happy! We'll see, as soon as Rob get back from vegas I'm gettin some ordered.
thanks for the thought though!!
tim
Yes, I run it in my SV and it gets great results...
Rotoboge (or anyone else for that matter)
Do you know what kind of jetting needs to be run in a 99-02 SV for Ultimate 4?
QuoteRotoboge (or anyone else for that matter)
Do you know what kind of jetting needs to be run in a 99-02 SV for Ultimate 4?
Call AJ at AJ's Performance in Phoenix, AZ. He built the engine/bike and can give you the lowdown on the engine tuning: 623-587-7708. 8)
Has anyone had problems with this stuff? I ran it in my SV last year and it made the bike run awesome at the track, but i let the bike sit for a couple of days and the thing ran like total S&!T. I had the thing at the shop 3 times and everytime we would clean the carbs there was a lot of sediment clogging the jets. The same thing also happened to a guy i do track days with. He has a GSXR 600 and it caused his carbs to malfuntion, as a result he crashed pretty hard. For me i love the power gains you get out of U4, but i am sick of all the problems, i'm going back to C12. I have a 15 Gal. drum U4 i want to get rid of. I will most likely sell it at the first summit point race. I'll let it go for $75.
QuoteHas anyone had problems with this stuff? I ran it in my SV last year and it made the bike run awesome at the track, but i let the bike sit for a couple of days and the thing ran like total S&!T. I had the thing at the shop 3 times and everytime we would clean the carbs there was a lot of sediment clogging the jets. The same thing also happened to a guy i do track days with. He has a GSXR 600 and it caused his carbs to malfuntion, as a result he crashed pretty hard. For me i love the power gains you get out of U4, but i am sick of all the problems, i'm going back to C12. I have a 15 Gal. drum U4 i want to get rid of. I will most likely sell it at the first summit point race. I'll let it go for $75.
If you run U4, drain it out of the tank after the race weekend and run some pump gas (or other race gas) through to flush it out of the carbs (or just drain the carbs). No big deal, a lot easier than cleaning the carbs all the time. The light fractions evaporate very quick, leaving all the gummy stuff behind.
I run U2 in my CR, and if I leave it in the tank my garage will stink the next day because it will difuse through the plastic tank. In a week it will all evaporate out of the carb leaving only the premix oil in the bowl.
-z.
never had any issues leaving the U4 in my 2000F4, never ever..HP gain?? how about 5hp.
here is the map with pump gas, and an "after" on U4 with jetting and 4deg timing advance.
REALLY woke the bike up.
(https://www.ccsforum.com/proxy.php?request=http%3A%2F%2Fimg229.exs.cx%2Fimg229%2F4052%2Fdynof44nd.jpg&hash=9ef68547571c8964411966a854fe67c328f39eed) (http://www.imageshack.us)
Ack!
Is that the kind of dyno sheet you should really get one where the first run is decent.
Ouch... Doesn't look like it carbureted well from the get go...prolly had less of a gain than 5HP...
And Greg...I saw you on the grid for one of the FUSA races...I was walking by, I waved...but you have no idea what I look like...LOL!
QuoteAck!
Is that the kind of dyno sheet you should really get one where the first run is decent.
Ouch... Doesn't look like it carbureted well from the get go...prolly had less of a gain than 5HP...
And Greg...I saw you on the grid for one of the FUSA races...I was walking by, I waved...but you have no idea what I look like...LOL!
oh he did... ;D :o LOL.......
QuoteAck!
Is that the kind of dyno sheet you should really get one where the first run is decent.
Ouch... Doesn't look like it carbureted well from the get go...prolly had less of a gain than 5HP...
And Greg...I saw you on the grid for one of the FUSA races...I was walking by, I waved...but you have no idea what I look like...LOL!
Hey Dave. Nope.. I have seen your bike, was doing well in the FUSA race running about 16th. After the restart i crashed between T1-2 when a rider went around me and i hit his rear wheel.
The first run on the F4 was after a 2-brothers pipe, but yes, pre jetting. The bike did run stronger on top pre jetting and U4 but the midrange sucked. You could feel the drop. It made about 93 hp pre pipe, and about what you see after pipe (95+) then 101+ after jetting and U4 and timing advance..
When I run U4 in the stock 99 VTR with just cans, it has a noticable increase in power.
Remember what the absolute purpose for using "race fuel"is for: obtaining HP.
If you choose the wrong fuel, thinking that octane will equal hp, you might be in for a BIG surprise. You say you are planing on burning this in your R6; well all I can add is that if you your compression ration is less than 12:1, I would'nt venture into the octane numbers above 100 rm/2. Octane slows down the fuel mixture burn rate, causes in longer push so to speak after ignition is introduced. If you don't have the compression to burn the mixture through the entire stroke, you will only be losing hp.
On the other side, you asked about U-4. It is a highly oxygenated fuel. Kind of like giving you an artificial compression boost. As U-4 burns, it creates O2, and causes a volume change. Due to U-4's vapor pressure and distillation curve, it has been known to cause "vapor lock" on hot arid days on bikes that recirculate or just have high tank temps.
I run U-4 in my SV and have a 3.5 hp gain on the dyno. The curve is pretty linear, but more prevelant at 8k rpm. So far, I have had no problems with "vapor lock" but I do keep my fuel iced on hot days. If you think you can change the characteristics on race fuel by mixing it with "pump" fuel, be careful as you can easily screw up the "cocktail" and end up with some pretty expensive, nice smelling pump gas.
The choice in race fuel is a critical on especially at $10+ a gallon.
Ok, now I know what "thingy" is...
The male chicken ;D
It was meant to read: "Male Chickentail" above!
On my 954, From a custom map w/ 93 to another custom map w/ U4 I only got 2.5hp up top. A touch more in the mid range. U4 is 92 oct.
QuoteRemember what the absolute purpose for using "race fuel"is for: obtaining HP.
Unless you're looking to accelerate better. Then we're back to fuel again.
How long are you at top RPM's? But how long are you at lower RPM's? If one can gain acceleration exiting a corner...
Octane is irrelevant.
It's all about chemical.
Use what's in your budget to get the best acceleration. It might be high or low octane. Many of the commonly available pump race fuels that one might consider to be high octane don't work well straight in multicylinder motorcycle engines. Others can be different.
It's hard to completely generalize on racing fuel if you haven't used everything.