Saturday was finally the day with decent temps and weather for some more dyno tests of the new VMax. We had to bikes here for testing. ynot1115 (Tony) was there with his VMax that we just installed the X-Pipe on for some re-baselining as we will be testing a few more X-pipe configurations over the next few weeks.

We also had some high profile guests at the shop that witnessed the tuning and our new record: Dale Walker and his chief fabricator stopped by with their own prototype (shhhh - I did not tell you ;-)) - they are taking their time to come up with something special.

Dale gave tons of good tips - not often that you have a pro look over your shoulders. Also brought a very special goody for the VMax so I can custom fit and install it on the bike ready for Drag Fest in October (see my prior blog post).

The goal for the day was to dyno two bikes, starting to get them both ready for the drag event. Before I go into the more elaborate race tuning, lets have a look at Tony's bike.

We had a very solid baseline from before when the bike was all stock. It pulled about 176.8 (STD) or 172.5 (SAE) rwhps. Good solid numbers. As always, the bike is fully warmed up by the time we take the peak numbers. All VMaxes we test have the TopSpeed fix installed - so even the stock VMax will do better in 4th and 5th gear just because of that.

Then we made the following changes to Tony's bike: 

1.) Aribox Mod: remove the restrictor from the inside of the airfilter (see various posts in our forums about that mod) but left the OEM filter in it. From prior tests on my bike we knew this would gain 3-4 rwhps in combination with the X-Pipe

2.) We installed the original X-Pipe, carefully checked for exhaust leaks, left the stock mufflers on the bike; no Power Commander

Warmed up the bike and did as many pulls to see a drop off in power.

This result should be interesting for many out there that have been asking about gains from the X-Pipe. SInce the air-box mod comes for free and we ran this without the Power Commander, this should be a very basic - yet very powerful configuration. We ran with with the AIS in place which should be removed to reduce the back firing at decel.

The bike pulled a solid 190.3 (STD) or 186.3 (SAE) rwhps. If you check the chart you will see the massive torque and power gains across much of the power-band.

No matter what scale you prefer (STD vs SAE) the gains are impressive: 14 rwhps at peak, even more beyond the peak. We have seen that before, but it was great to re-produce these numbers on a different bike.

Then we did some more tuning on the Monster/Monster setup: 2009 Vmax with hand made Monster pipe (4 into 2 cross merge collector) with Competition Werkes mufflers on it, Monster Big Air, TopSpeed, EXUP eliminator, AIS blocked off, PCV & Auto-tune (see separate posts about auto-tune details). From prior testing we know that the Monster Pipe on my bike is within 1 rwhps of the X-Pipe - lets call that a wash for most parts of it.

The big difference is the Big Air stacks and the custom mapped PCV.

First we ran and fine tuned the setup for 91 Octane street gas - as all prior runs we did so far.

The result set a new record for our dyno - Most Powerful Bike measured to date: 197.4 (STD) or 192.9 (SAE) rwhps. That's about 20 rwhps more over stock, even more past peak. AT 6500 rpm the torque rises rapidly to reach its peak of 124.7 (STD) or 121.9 (SAE) ftlbs. And you feel that when you are going through the gears.

Next we went on to do very very first race fuel tests with that setup. To start with we went with the popular U4 from VP fuels. We have more different fuels coming in the next few weeks and expect to see even better results from a slightly different fuel, but the lead times can be significant. 

In order to use the custom oxygenated race fuels an entire new fuel map had to be developed and since we did not know the sweet spot for this fuel and the VMax we made custom maps for 12.0:1, 12.5:1, 13.0:1 & 13.5:1 air fuel ratio to measure and compare torque and power. 

Even at 13.0:1 the U4 race gas requires up to 10% more fuel to arrive at the desired AF ratio compared to pump gas. As with Pump gas the bike makes it peak power at around 13:1.

We spent about 2h of fine-tuning the various maps. The bike was allowed to cool off for a while, with blowers running at full power and we went on to make the peak power runs.

Well, the earlier record did not last long. 199.2 (STD) or 194.9 (SAE) rwhps. Just a touch short of the magical 200 rwhps. Since we have not yet played all our cards, I'd say we will see 200+ rwhps for the VMax before year end, without NOS, major engine work or turbo/blower.

We will have both bikes setup for Drag Day and it will be interesting what our racers can squeeze out of them. Next we will test a couple more X-Pipe configurations on Tony's bike, followed by the install of the Monster Big Air and PCV. 

You can find the charts for the day in a dedicated album on our community pages:

http://www.starvmax.com/community/photos/photo?albumid=127&userid=63#photoid=1364

I have also included an extra chart to show the runtime of the step tests, we use to custom map the bike to new configurations. Runs are done in 250 rpm increments from various starting rpms all the way to redline. They can take in excess of 90 seconds and are only possible with massive amounts of fresh air forced through the radiators.

Some fun stats: This tuning session took about 130 pulls and step tests, or about 140 miles on the odometer just for my bike. In addition to a full tank of 91 pump gas we went through 5 gallon of U4 - about $80 bucks just in race gas.

As always any tests and modifications described herein are for sanctioned off road racing events only. All modifications should be performed by licensed and skilled mechanics. Dyno setups will vary, but most importantly all modifications must have been properly performed (e.g absolutely no exhaust leaks - always use fresh gaskets), we use stock size tires, the right oil and oil level for the temperature (always full synthetic - either Mobil 1 10W40 or Yamalube 20W50 (for hot summer) or 10W30 (for cooler race events).