My
MegaSquirted Racebike
Or
How I
Actually Impressed a Dyno Operator
Well, here it is…one Suzuki
SV650 with a little bit of work.
Chassis:
Motor work is pretty
minimal:
A new intake manifold was cut
so that I could match the throttle bodies I built to the port, which was built
for a much smaller CV carb. The whole
intake tract was then ported to a nice blended taper down to the valves from
the 46mm throttle bodies.
Used the stock ignition
system. The TPS for the ignition is on
my TB, with the MS piggybacked off of the TPS and triggered by the ignition.
There is actually quite a
bit of room for the installation. Even
for the very large K&N air filtres, once I removed the radiator overflow
tank and replaced with something more reasonable.
Throttle bodies are pretty
simple. Main body has a bunch of mount
points and the spindle with the plate on it.
Front is a bolt on velocity stack, and back is a bolt on flange. There is a riser to help locate the
injectors, which are mounted in bungs installed in the filter top.
Each TB is mounted to it’s
manifold using a couple of hose clamps around some NAPA fuel filler line. Throttle cable is split to actuate each TB
independently, rather than engineer a linkage.
I used the fuel level sensor
hole in the tank, and made a connector that gravity feeds thru a prefiltre to
the pump down below the right side of the engine, just in front of the clutch
housing. After going thru the main
filter, the fuel hits the regulator that I set to 3bar via the clamp
method. Excess goes back to the tank,
and there is a feed to the injectors for a sortof returnless system.
The actual controller is
mounted in the nose, just below/behind the instruments. I put some foam padding behind, and it is
held in place with a bungie cord setup.
FINAL RESULTS:
The stock carbs are CV, at
39mm. The bike was jetted with these on
the stock manifolds and airbox for the dyno run. The only difference between this run and the Squirted run is from
the manifolds out.
A stock curve is also here,
for comparison:
Stock makes 67.8hp@9800rpm, 43.2lb-ft@7700rpm
Modified makes 86hp@10000rpm, 50.8lb-ft@7500rpm
Squirted makes 93.6hp@11000rpm, 52.3lb-ft@8700rpm
I still need to do a bit of
midrange tuning. I noticed at the track
that at 30-60% throttle I have some lean spots. Once I get above that tho, this thing goes a helluva lot better
than me!