|
What was required to happen on the quad since are last meeting was the installation of a throttle position sensor, which was done thanks to John Pires. On arrival, we discovered the throttle pot was incorrectly installed and would never work without rewiring it.
“Why do you need a throttle pot to tell you that the tap is fully open?” was John’s question.
To fit the fuel injection unit to the bike, a couple of mods had to be made.
|
|
Before |
After |
The back end of a standard blaster, by the two-stroke oil reservoir. |
The reservoir had to go, making space for the fuel pump and fuel filter. The tool box had to be cut to fit the new battery |
A standard look from the side onto the carb. |
The carb was removed and replaced with the fuel injection manifold and injector. A high fuel volume out-let and in-let connection had to be made |
 |
John, from Southern Yamaha (the Dyno wiz), was eager to get the show on the road, before we even had time to plug the laptop in.
He, was very curious, and thought it would work, but was interested to know how we did it. |
| |
|
 |
The first couple of runs brought lots of smoke into the workshop , but also awesome grunt. We had 26 Hp at one stage. With tears in our eyes the lads asked Peter kindly to make it leaner, “De Smoke is killing de eyes!” Now she started to move. We had to put an rpm limit in at 11 500 rpm as she was getting there extremely fast, stretching her legs to over 101 Km in 4 gear. Loads of torque (34 Nm) at low rpm’s (5000 RPM), holding it all the way through. Ideal riding. But the Horsepower was all over the place. |
| |
|
So the general consensus was to get the bike rideable, smooth through the power curve and bring the torque up. That all means a couple of horses had to go. After just a couple of runs, we had the best of almost both worlds. The power was at 24 Hp compared to a standard 12 Hp. The best bike (200cc Blaster) we where told was running 27 Hp, but that set the guy back an arm and a leg.
"You are crazy in trying to fuel inject a two stroke, single cylinder bike, it will never work and the gains are nominal!!!", were the words of one of the local mechanics there. The amount of interest that was sparked in the sound of the bikes acceleration and high rpm’s spread like wild fire. Soon those words were forgotten as new untapped power was being unleashed.
|
 |
At the end of the day John, the Dyno wiz, took the bike for a spin around the block and this is what he had to say,
"I was pretty impressed with the bike, very good acceleration, the bike would be brilliant on a track, but it is not refined yet. Awesome lowdown acceleration, the bike just wants to Wheelie. Top end drop off and no power in 6th gear, but very quick trough the gears." |
Our bike's power does drop off at 6500RPM, which is due to the fact that the injector and fuel pump are too large, making tuning very coarse. This can be seen on the second Dyno graph. |
 |
Bold lines are dyno graph for the fastest blaster in South Africa, so we have been told. Faint lines are the dyno graph for our blaster. Click on the picture for a bigger view.
Dyno graph of our blaster (Click on the picture for a bigger view.), the results of our bike:
Speed: 57 km @ 7982RPM in 4th gear.
Power: 24 Hp @ 6891RPM
Torque: 25 Nm @ 6785RPM
Tractive Force: 99 kg @ 6785RPM
A/F: 39,075 @ 4582RPM
|
We have conquered the impossible and made it work. This proves that there is unbelievable power to be gained from fuel injecting a 2-stroke bike. We have still a couple of improvement and refinements to make before the final release, such as getting the throttle sensor to function, giving the bike mid cruising potential.
Bottom line, Perfect Power will be here to provide power, torque, responsiveness and tuneability to the 2-stroke and 4-stroke biking fraternity. Enquire about our PRS2 (soon to be released) and PRS4 stand alone fuel injection units at info@perfectpower.com.
By Peter Ludwig, email: peter@dtwebs.com.
Dyno Time sponsored by Southern Yamaha, email: southernyamaha@54.co.za.
Installation done by Pires Motorsport, email: piresmts@netactive.co.za.
|
Terms and Conditions l Privacy Policy
Perfect Power and its associates disclaim all liability for any loss, damage, injury or expense however caused, arising from the use of or reliance upon, in any manner, the information provided through this service.
Copyright © 2006 Digital Data Systems (Pty) Ltd.
Please feel free to contact us at info@perfectpower.com with any queries,
suggestions, web problems etc. which you may have |
|
|
|
 |
|
 |
Application Notes, Wiring Diagrams, Software Upgrades and more!
FREE downloads here. |
|
 |
FREE Exposure on our web site, link your company here |
|
 |
|
|
|
 |
