Today we dialed in Dave Morris’ ZR1010, we have his last year’s dyno numbers posted on subscribers’ pages. this time he came with twin pipes insead of last year’s single with stock muffler. HP was down by maybe 8– Dave didn’t have time to reinstall his single pipe to redyno but I suspect that his twins are beating him up. not the first time we’ve seen that. But we were able to tune his Boss Noss system to add very close to 30 HP to his baseline.
We also dyno tuned his pal Dan Anderson’s Bikeman F8, added a key here to get 160+ HP at .70 extremely safe BSFC with only raised fuel pressure. We needed to bump timing because with stock key his HP peak was sliding up to 8200 where stock ECU map pulls fuel flow out to dangerously lean for F8, and installing a 2 degree key shoved HP peak down to 7900-8000 where fuel flow is fat and happy.
Dan had a Boondocker box with him to dial in, but his low-revving bikeman modded stock pipe and his added Bikeman fuel pressure made that unnecessary. He was fine with stock ECU, bumped fuel pressure.
After Dave and Dan headed west on I90, I called Larry Bartlett (local sled tuner on standby) who brought in a 03 1/2 Blair Morgan MXZX800 that he had tweaked with a .015 headnip and sanded ports, stock pipe and DynoPort can made 104 lb/ft 158 HP at .58 lb/hphr. We fattened up jetting to drop HP to 152 at .65. Larry installed a set of last year’s factorymod snoX twin pipes, made 154 just as the rev limiter kicked in 1000 rpm higher than stock, with maybe 10 less lb/ft torque. Jimmy Cooper is coming tomorrow 8:30 AM with his computer to bump timing to see if there is more HP lurking.