Alright, I just didn't want to ask this on the other U4 post, although I probably could have. I just read the RRW race fuel comparison, I have never ran race fuel, so I am completely ignorant about it. a couple ?'s 1. If I decide to run U4(not E) how much of a mapping change will be needed to get a good improvement? If I don't have access to a good dyno in time to setup a map for it, will I still get a noticeable improvement? 2. How does running race fuel affect fuel mileage? Will I get about the same amout of laps on the same amount of fuel? 3. RRW claimed a 9hp gain on a 04 750, on a 04 gsxr 600, any clue about hp gains?(I'm a cheap bastard, and need reassured that I can justify the extra $$$ ) 4. Will guys follow me around the race track just so that they can smell that great U4 smell like I have done before?? I have a "stock" 04 GSXR 600. M4 pipe, PCIIIusb, 520 conv. Everything else is stock, I Promise(Even though it was questioned in an earlier post ). Oh yea question four was a joke but I have to admitt that I have done that before, if on ly for a lap or two, alright maybee four
There has been a gazillion threads on this. Best thing to do is a search. This has been debated over and again. I have not seen the test. But I was told U4 made more hp than MR9. I can't see that happening. I sell a shitload of MR9 to some of the top riders in the series.They switched from U4 to MR9. If you do not spend a full day on the dyno, with someone who knows what they are doing, you are wasting you $$$ on race fuel.
1-different bikes require different mapping changes but you should see an improvement without any changes 2-VP helps fuel mileage 3-I did have the results of the tests prior to being published in RRW but I have not heard from anyone else on any other bike For more in depth details, read earlier posts. Cindy
Hows this for dyno results on my AM season bike. A 2000 Honda 600 F4.. We id a Jetting change, 4deg advance and U4 fuel. My bike was a new bike after this. was running pump gas and had a full 2-brothers system with stock timing. BAD mid range dip as you can see. Chad at Kinetic got that flattend out and the U4 gave us about 6hp, with a nice rise at the end that did not drop off.
If the top riders you speak of run any AMA races then they can't use U4. I would assume that they seet their bikes up for MR9 because thy can run it in any series.
Nice curve! I can't see U4 making more than MR9 though. I know the way U4 makes power, but never jetted or mapped for MR9.
I would agree. My teammate runs MR1 normally, and the MR9 at the "big" races where we need a little more HP. The U4 is just super oxegenated and as noted in some posts, not AMA legal. I have my 2003R6 dynod for MR1.. but it runs GREAT on the U4 as well. It dynod at 109hp but have yet to do a run on MR9.
But they mostly run WERA or CCS, so they would want the fuel that makes the best power.You can always put different maps in, as you know.
I need to note that I did not have the actual test results prior to the magazine being published. I was told of the results this weekend which I thought was prior to publication. The magazine was printed and sent to Laguna Sega this weekend. I was unaware that this is how VP found out about the dyno results. Cindy
