This morning we finished off Ziggy’s F8 with Boondocker and a hermaphrodite (part stock part custom stamped looks like it won’t fit the stock heat shield) BM single prototype that matched Ziggy’s F8 modded stock pipe. The modded stock pipe had that camel hump dip just after valve opening and the new pipe was smooth, peaked at higher revs and had flat HP from 7600-8100 revs, but matched the modded stock pipe output. Ziggy used one of our zero overlap Boondockers and we dialed him in yesterday at .70+ 11/1 from 7200 valve opening to 8100, even with his fuel pressure dropped from 57 to 45 psi, 160 HP flat for maybe 4-500 revs. Then we created a leaner Boondocker map, went to .65 and mid 11’s/1 and 163 HP. I’m such a chicken-ass Ziggy was thinking 12/1 for dragging but I talked him out of it. Surely could have made high 160’s but I just want him to be reliable. The final 20 minutes of dyno tuning was dyno trail riding in the midrange, using the computer control, varying throttle position and revs watching A/F ratio, a few lean spots were enrichened and a few fat spots were leaned out. This will be dandy for Ziggy to ride since during his last dyno session (preBoondocker) we had to crank his fuel pressre to the moon to be midrange WOT OK then mainjetted him to make good top end A/F ratio. But he was blubbery at cruise with that. His jeep got better MPG than his sled. The Boondocker is the best for dyno tuning these big bores. Ziggy is ordering a digital water temp gauge to install in his sled, will monitor that this winter. He is overpowering his cooling system by 20-30 HP and observing coolant temp is critical for reliability.
Then Bikeman Erich Long rolled in and dyno tuned the two F9’s he brought to the Shootout last week. He had planned to do final tuning of his sleds here last Thursday on his way to Old Forge but was way too late– I had to pick up SW / SnowGoer ed Tim Erikson at the Buffalo airport at noon, then Tim and I blasted to Old Forge for me to make Slickers at 5 and then Shootout dealer meeting at 7. So today we started with Erich’s 901cc F9 single piper, stock muffler. Somehow his Boondocker calibration had been goofed up, and he made “only” 166 HP at .80 lb/hphr 10/1. After leaning out the Boondocker we dialed it to 176.4 HP at .60 and 120 lb/ft. Erich should have hurried last Thursday.
Then we dyno’d his twin pipe F9–that was OK on Boondocker cal, but that new quiet stock cannister muffler he installed without dynoing before leaving for NY (he was hoping for the DynoTech SW Quiet Giant award which he received at the banquet) choked 10% airflow CFM and consequently “only” made 181 HP. We made two dyno runs, A/F ratio was surely lean enough but there was no way to get to 190+ without that missing 10% airflow CFM. Tuning would not help this one. And the loud glasspacks he dyno calibrated with last week were back in the BM shop.
This week I think i have I have sleds every day, a few on standby in case I get a cancellation. You can watch on DynoCams, and when I check my schedule at work tomorrow I will try to post what sleds are coming when. ILMJ.