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93 Pump Fuel vs. Renegade SX4 & SX4+
Lab Rat: My Personal TRX 450R - SWP Engine Top to Bottom, Barkers Full Exhaust System, Stock CDI, Stock Intake, SWP 42.5 Taper Bored Carb
Today was spent burning High dollar race fuel in hopes of finding the answer, is it really worth it? I started off with my normal warm up and dyno adjustments as I would for any other tuning. While ripping off runs I paid close attention to things such as AFR, responsiveness, and run times. After about 20 runs on the pump fuel I was left believing that I had a good baseline to compare my next runs to. So I drained my fuel tank and started with the next test.
My first test fuel was Renegade SX4. The first thing you notice when you pop the top is its odor, it will just about knock you on your ass if you’re not in a ventilated area! After filling up my tank I hopped on the quad and gave it a couple kicks only to hear it fire but not run. This had me concerned as normally the kick of a 10 year old school girl can fire this thing up. I am still not sure what that was all about but it fired up on the next kick and I had no problems with it after that.
Once I got it running I immediately noticed that the machine was slightly leaner at an idle. This could have been from me messing with the idle adjustment when it wouldn’t start right up. Once I started to make some runs, I noticed that it seemed to sound and run very similar to when I had pump gas in it. The only difference was that it seemed to be a little more responsive. After inspecting the graphs I noticed that the SX4 likes a little less fuel, so I spent some time finding the exact combination. After all the runs I ended up only changing the main jet from a 178 to a 170.
I discovered that jet changes of any size do not seem to make a great deal of difference in the final output. This tells me that SX4 has a very large sweet spot, which in my opinion makes it very user friendly. This allows the machine to still run very well with atmosphere changes such as humidity and temps. I drained the fuel and flushed out the tank to get ready for the next test. All in all I ended up with an average between 1 and 1.5 HP gain spread throughout the graph. The best gains came after 8000 RPMs.
It was then time for the $45/gallon stuff; this is what we have all been waiting for. The machine fired up great; first kick as it always does. The first thing I noticed was that it was rich at Idle. I continued anyways as I wanted to see if there was going to be any other changes that needed to be made. After making a few runs I inspected the graph to find that it is a little richer yet, but very minimal. I noticed that the machine sounded noticeably better, more crisp, revs faster and lost any hesitation that it had from an idle to whacking the throttle hard.
I continued to make all of the appropriate changes and found out once again what the machine liked best. I ended up going down to a 168 main and a 42 pilot only to find little change in the graph, this fuel also has a nice sweet spot! An additional 1-1.5 HP was gained over the SX4 and an amazing 2.5-3 HP over the pump gas.
I know everyone is probably wondering how it compares to VP and I would love to have the opportunity to do a comparison of the two. Though Renegade tends to cost a little more than its rival VP Fuels, it seems to me that it has very similar results on the dyno. So is it worth the money, I think so how about you?