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This is some real world data from my old GS draw system this past
weekend. I tried to get a few shots of some nice lag and no spray.
Keep in mind that when you look at these graphs, the bike was not
just started cold. Prior to the 2500 RPM idle was a third gear burn-out
for about four seconds. So things are already hot.
The top two curve show the crank RPM (yellow) and the drive shaft
RPM (red).
The next four curves in the center show the exhaust temp in C (blue),
and manifold pressure in PSIG (yellow).
In the next shot, I show the manifold pressure zoomed in.
Even bringing the crank RPM to over 7500 does not produce a positive
pressure in the manifold. The cursor was placed where I started to see
an increase in exhaust temperature. Notice this is also close to where
I start to see some positive pressure. With the crank now turning at an
even lower RPM, instead of a negative 2 PSIG we read a poisitive
5 PSIG. As the heat continues to rise, the pressure does also until
it reaches the setpoint of the wastegate.
This is a very old, low tech bike. The transmission is stock with back-cut
and requires a kill to shift. This is the dips you see in the pressure and
RPM curves.
The shift points can be seen in the last "digital" curves. The blue curve
is the solenoid drive to the air shift. When this is high, the solenoid is
active. The green curve just above it is the transbrake button.
When this curve goes high, I have released the transbreak and the
Dedenbear has started the run sequence.
weekend. I tried to get a few shots of some nice lag and no spray.
Keep in mind that when you look at these graphs, the bike was not
just started cold. Prior to the 2500 RPM idle was a third gear burn-out
for about four seconds. So things are already hot.
The top two curve show the crank RPM (yellow) and the drive shaft
RPM (red).
The next four curves in the center show the exhaust temp in C (blue),
and manifold pressure in PSIG (yellow).
In the next shot, I show the manifold pressure zoomed in.
Even bringing the crank RPM to over 7500 does not produce a positive
pressure in the manifold. The cursor was placed where I started to see
an increase in exhaust temperature. Notice this is also close to where
I start to see some positive pressure. With the crank now turning at an
even lower RPM, instead of a negative 2 PSIG we read a poisitive
5 PSIG. As the heat continues to rise, the pressure does also until
it reaches the setpoint of the wastegate.
This is a very old, low tech bike. The transmission is stock with back-cut
and requires a kill to shift. This is the dips you see in the pressure and
RPM curves.
The shift points can be seen in the last "digital" curves. The blue curve
is the solenoid drive to the air shift. When this is high, the solenoid is
active. The green curve just above it is the transbrake button.
When this curve goes high, I have released the transbreak and the
Dedenbear has started the run sequence.
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