This past weekend I was able to finally get the SV onto the dyno and get it fully tuned. This is because the first couple of times I got it on there for tunning I ran into a slipping clutch issue. With that resolved and 3 race weekends under my belt it was time to finish the tuning.
So I called up Mike 'Fuzzy' Castro and scheduled sometime on the Redline Motorsports dyno. With this dyno time I not only was looking for the best map with what I have been running, I also wanted to test out a few parts and different fuels.
What to test:
1. Fuel. Compare VP U4.4 to EKC 110K (aka R-Tech R110)
2. Throttle bodies. Compare stock throttle bodies to 42mm overboard throttle bodies
3. Spark plugs. Surface discharged to standard iridium plugs
What I have been running is U4.4 with surface discharged spark plugs and the bored throttle bodies.
Let's start with the results of the spark plugs. The change made zero effect on the bike. Nothing to A/F or to the power curve. So in the future I'll save my money and stay with the standard iridium plugs instead of the twice the price surface discharge plugs.
Up next is the throttle bodies. The chart below shows the differences between the two runs (after tuning each throttle body for best effect).
What you see is that up until 8k RPMs the stock throttle bodies produced marginally more power. But at 8k rpms the bored throttle bodies continued to produce power while the stock throttle bodies leveled off. This gives the bored throttle bodies 2.1 more horsepower. Since the tracks I race at in general need to have top end alot I plan on staying with the bored throttle bodies.
The final test was with the R110 fuel. What we found is that while we could get almost the same power out of the fuel, the bike had to run it very very lean. Too lean for Fuzzy and my liking. Now it is ~$2 less per gallon so it is a good practice fuel.
