I talked to Dan and Dale friday–after they saw my 05 F7 post, they
grabbed one of their own 05’s and put in on their dyno. Their 05 made
way less HP the ours, 110+ lb/hr fuel flow. So probably Kaz’ 05 was one
of those lucky hot ones like we’ve seen in the past.
Also D&D is planning to bring two sleds to the SW Shootout–a long
track F9 (their F8 cyls with larger bore and longer sroke) and a 660
turbo with trail hopup kit. I hope we get to dyno both here, since
SnowWeek will publish any Trail Mod dyno sheets we come up with.
Carl McQuillen (585-768-2322) has set up a jig to make it easier to EDM
advance keyways in Cat flywheels. The latest on he did a 7 degrees for
an F8 carb sled we’re dyno tuning tomorrow. He stamps the original
keyway with a “0” and in this case the new keyway is stamped “+7”. Carl
is also the guy who manufactures the Fuel Safe nitrogen blanket system
to pressurize drummed race gas, maintaining light ends with three
psi nitrogen. The Fuel Safe also dispenses the fuel like a beer tap.
Our drummed race fuel lasts indefinitely this way. Half-full drums of
race gas can go “dead” in a short time–light ends go away like CO2
goes away in half-full liters of Pepsi (every time you open the Pepsi
bottle to take a swig that “whish” means more carbonation lost).
Similarly, every time you crack the bung on your drum of fuel the
“whish” you hear and smell means more light ends gone. When enough
light ends are lost, fuel does not readily vaporize and detonation can
occur with low EGT’s and safe-appearing A/F ratios.
Last Saturday we also did our third back to back comparison of big
mouth Firecat airbox inlet vs stock. And for the third time, Bob
Swift’s SLP twin-piped F8 lost low end and midrange WOT airflow, then
added airflow at HP peak when we switched from big mouth to
stock. As I recall we picked up 2 HP at peak due to added CFM with
fixed trail-safe fuel flow lb/hr. As a bonus, the slight reduction in
midrange airflow was welcomed, since the ECU does not provide adequate
low end/ midrange fuel to keep up with the high-flowing twin pipes
without jacking fuel pressure to the moon.
I’m planning to take a crack at dyno tuning a Polaris Fusion this week,
hopefully Tuesday. Sled will be borrowed from Cooper’s Sales and
Service.