I forgot to mention on 2/14 we spent four hours boondockering (and installing a key) with Sam from South of Detroit, a Bikeman F8 with BM single and stock muffler came up with four beautiful Boondocker fuel curves, HP from 155 to 161, posted power/ fuel curves on DTR.
Feb 20 HTG will be back again with ported MachZ with Boondocker and Crankshop twin pipes. Also blasting some N2O (don’t call it noss) after NA tuning is done.boondockered from 192 to 197, stock compression (this included making a reed change and picking up 10 cfm and 4HP). Tuned conventional N2O kit to 268HP on good gas.
Feb 21 John Z bringing an 1100 big bore MachZ and a Cutler F10.F10 cancelled. John Z’s 1100 easily made 200 on pump gas low .60’s with 137 lb/ft NA, this time we got excellent HP out of John’s Boondocker EFI N2O which added 42 HP with two five hole foggers in the outer airbox…at only 500 psi cylinder pressure.
Feb 23, JR bringing troublesome F7 w/ SLP twins, modified to fit stock muffler, Boondocker to tune in. added a bunch of part throttle fuel, took away various amounts of top end fuel to try to obtain decent mileage and safe .70 lb/hphr WOT BSFC on JRs bone stock F7. These twins into the stock muffler were quiet but unruly at 7200 rpm valve opening I think because at about 6700 the HP begins to tail off as revs climb, then jumps about 30 HP as soon as valves open. This would be less noticable in the field on 05 and 06 models since valves open in the field as soon as throttle is whacked. 2/27 update JRs dad called sled runs poorly in the field, plugs scary gray, I’m concerned since we dialed in fuel flow at .70 then dropped numbers that should have created .65 and more HP on the dyno but it dropped HP. Was the stock muffler choking airflow CFM and creating deto? JR may come back in a week to try the real SLP can.
Feb 27, Intimidator Jim bringing his F7 stocker to try some fine tuning prior to going to Phatman Shootout. Phatman Shootout cancelled, we learned a lot today about Intimidator’s HP peak RPM depending on pipe temp. He and Fast Eddy will be at Big Moose this weekend with an all-new helix to match dyno RPM.
Feb 28 and/ or March 1, more CycleDyn (SuperFlow eddy current roller dyno) endurance testing on packing material on motocross race muffler. Also one or more of those days, a local performance company will be boosting performance of Cat 660 turbo.Today 2/28, local automotive performance shop savvy w/ car turbo/ supercharging came with bone stock T660 with their own electronic upgrades (boost/ fuel/ timing/ parameter protection overrides), would you believe on their pump gas 165 CHP hot engine/ cool intercooler stab? Long pull hot intercooler still well over 150 on pump gas. They are planning to sell a plug-in deal that has these overrides.
March 1 PM going to Batavia Holiday Inn Yamaha show to look at the new Phazer. Will offer to barter coctails for use of a Phazer for a few hours on the dyno after show. No barter deal would work here, these truck guys just wanted to go down the road to next stop.
March 2 AM more dyno endurance testing of aftermarket motocross bike muffler packing. One muffler user is Ricky Carmichael who eats packing in one race, but last weekend was bounced for fuel violation after winning race. Could nasty gas eat packing?
March 2 PM three sleds to dyno: #1 a HO800 SkiDoo (dynod stock a few weeks ago) with custom low dome pistons to alter port timing w/ custom head dropped into cylinder more on this situation later. #2 Dan Forte’s XC700 stock cylinders w/ HTG twin pipes, cut head, timing cranked, 147 HP at .60 lb/hphr. #3 John T Cowie’s XC600 looking for more HP on his twin pipe trail mod sled cut 1/2″ from center section cut 1/2″ from header pipe, should have gained a few hundred revs, and gained 5 or more HP? lost 10 HP.