bumper
Well-Known Member
This is very interesting and almost affordable.
http://roadstercycle.com/yamaha_vmax_fuel_injector_cv_car.htm
http://roadstercycle.com/yamaha_vmax_fuel_injector_cv_car.htm
Sequential fuel injection means that you have crank triggers and or cam triggers so you inject fuel exactly at the right moment when the intake valve starts to open. More sensors, more work, more money.
Pulse generator... it is what tells the ignition system when to fire. Can someone explain to me WHY the FI timing could not be run off of the pulse generator on the crank? Everyone says cam position sensor, but the cam position is solidly fixed to the crank position.crank triggers
Pulse generator... it is what tells the ignition system when to fire. Can someone explain to me WHY the FI timing could not be run off of the pulse generator on the crank? Everyone says cam position sensor, but the cam position is solidly fixed to the crank position.
The Vmax world has come A LONG WAY over the last 15 years. If there were a practical, affordable , USER FRIENDLY way to do it it would have been done.
THERE IS NOT. But I wish you good luck
I'm not delusional, as I know several have tried to get this working, but it's definately the final frontier for the Gen 1 and I can't help but try...
Not an expert in this subject but my best guess is because the cam turns at half engine speed and the injection pulse would be triggered on the inlet stroke.
If mounted on the crank then you would get a pulse every rotation and would have to filter out alternate pulses.
For the ignition it doesn't matter if there is a spark on the exhaust stroke.
Could be wrong though...
I believe that would be the difference between single and dual fire ignitions. If they can get an ignition to fire only on the compression stroke...
I, for one, would be VERY interested in getting all of this to work, and to have it all work with the V-boost even would be an added benny XD
Among others, I believe H-D's us a 'waste' spark where the plug also fires on the exhaust stroke. It might even help to limit unburnt hydrocarbons in the exhaust flow.
It may only be a matter of terminology, but I believe the spark propagation across the combustion chamber occurs on the 'power' stroke, and yes, I know there is something known as 'advance.' The thinner the size and the smaller the volume of the combustion chamber 'envelope,' the more advance you have to run.
Did you get around to finishing this up?I'm going to head down the EFI route, but I'm going to use throttle bodies (the kind that are easily seperatable will work best - I grabbed GSX 750 TB's fairly cheap), fab up some TB to manifold connectors (this will be fun...got some SS tube and will attempt to create some reducers to connect TB to stock manifold), and will most certainly go down the batch injection route (all the reading I've done suggests that getting the Vmax to a multi-port state requires adding sensors and other headaches - not worth it to me for the marginal performance gain). So the hardware isn't terribly difficult, but the mapping will be challenging. I know a mechanic that dables in EFI so I'll be relying on his expertise to get it kinda running decent. Carbs are ok, but EFI will be slick if it can be done reasonably...
What type of ecu box will you be runningI'm going to head down the EFI route, but I'm going to use throttle bodies (the kind that are easily seperatable will work best - I grabbed GSX 750 TB's fairly cheap), fab up some TB to manifold connectors (this will be fun...got some SS tube and will attempt to create some reducers to connect TB to stock manifold), and will most certainly go down the batch injection route (all the reading I've done suggests that getting the Vmax to a multi-port state requires adding sensors and other headaches - not worth it to me for the marginal performance gain). So the hardware isn't terribly difficult, but the mapping will be challenging. I know a mechanic that dables in EFI so I'll be relying on his expertise to get it kinda running decent. Carbs are ok, but EFI will be slick if it can be done reasonably...
Enter your email address to join: