Friday, June 06, 2008
6/7 9AM Sat Scott Brownlee & Nelson Cadieux [Carlson Sports from North Bay Ontario Canada] (1) F7 grass dragracer owned by Terry Waite I'm thinking that all "500 foot" F7 drag boxes may not be created equally--- I've seen too many that with correct fuel pressure could stand leaning out from restricter or Boondocker--this one had Boondocker and it needed huge negative numbers and a big offset key to make max HP at peak revs, and had an awful lean dip in midrange that we partially cured with big positive Boondocker numbers there... and (1) F1000 asphalt sled owned by Kevin Mossip typical boondocker tuneup, tweaked to max HP running for the time at WOT expected in the 1/4 mile...
6/12 9am Bill and Michael Phelps, SkiDoo Rev 860 twin for asphalt, need to find out why it doesn't run down the track as expected. all XP800 drag ECUs may not be created equally, either--found a huge dip in HP off the line caused by totally F'd up power valve control by the privateer "race" ECU, fixed it by fooling sensors, plugging hoses, etc...
3pm Tony Buczek, with our original F7 carbed sled on DTR, now big bore/ twin pipes, hoping for big HP. Will he need more than 7 degrees offset keyway with big bore? Greedy Tony wants this kept quiet but with Hooper Big Bore cylinders he's right up there with the other local semi-stock dragracers...
6/18 (Sean got the wrong large injectors, now have the correct ones) crack of noon Sean Ray with a Vrod turbo kit he designed with Garrett GT25 ball bearing turbo, tuning with Power Commander boost referenced unit to control fuel and timing. the Power Commander with boost compensation is superb for dialing in perfect fuel and timing on or off boost--Sean had larger Delphi injectors, and was able to dial in good part throttle fuel flow and correct on-boost fuel flow in a few hours on our SuperFlow eddy current roller dyno. Made 206 HP DJRWHP and just quit there...
6/18 our first SkiDoo 4tech 1200 intercooled turbo for preliminary fuel/ timing tuning, possibly cameras off. Greg Bennett and sons, VP import gas, possibly record HP for bone stock anything with boost....sled is off to Crankshop Larry for tube chassis replacement, a new cylinder head is on its way to be ported by an old pal Hyabusa/ Kaw turbo dragracer, cams coming, will be back to dyno late summer.
6/20 AM Dan Forte tuning mod Banshee on 901 dyno w/ driveshaft from trans to dyno the 901 shaft dyno we use for all sleds is so useful in that it uses mechanical measurement of airflow and mechanical measurement of airflow--instantaneous and tells us what's happening right now...Dan had bored his carbs and the first thing we saw was 16/1 A/F at WOT and that was corrected with carb venting, then jacked timing around and found the sweet spot adding 10 midrange HP and close to that on top end.
6/21 our second SkiDoo 4tech 1200 turbo from Full Power Justin Fuller. this was a Bell Ringer for Justin and the hotrodders who have 4teks on order, and for those who are now ordering them based upon these results, all posted on DTR..
.6/24 Eric Johncox with a flock of flatrack bike racers, inlcuding Jason DiSalvo's YZ480, heading for a big national race 6/30...the local bike flattrack racers are finally apreciating the necessity of dyno tuning for max HP, just like our sledders began to appreciate here 20 years ago...you see more and more flattrack bikes on the dyno now...
.6/28 Captain Kacz, Jerry Kaczenowski a local legend in sled oval and dragracing since the 197x Thundercat days, bringing six grassdrag sleds to dyno tune.
Dragon800 update...I'm sure my Dragon 800 dyno test reports on this website have caused a stir. Sno-checkers are expecting 154 HP as listed on Polaris' website (I wasn't aware that Polaris posted those numbers until recently). Now our preproduction Dragon 800 with preproduction ECU came in at lower-than-advertised HP, and the followup 09 Production ECU came in even lower. Now everyone observing this stuff must understand I would not ever post "substandard" numbers on any engine package without corroborating data (more than one or two samples). A base engine that was low on HP might have a crank out of phase, etc. But in this case I wasn't aware of Polaris' 154 HP claim on their website, but my 140ish HP was identical to what my friends at Xtreme Dyno and Polaris in Utah (6500ft) and CO have gotten on the 08 RMK800's they've sold and dyno tested http://www.xtreme-performance.com/custompa...results_polaris. And their follow up results of that simple stock pipe "mod" is identical to what we saw here at 1000 ft. Then, my contacts at Polaris assure me that the Dragon 800 production pipe will be identical to what our preproduction sled has (without the infamous "pipe mod" by BMP). So my opinion now is that if sea level Dragon 800 buyers expect 154 HP they will have to spend $200 to have BMP or others to modify the stock pipe, or buy an aftermarket single. I'm surmising that EPA issues with sound and / or emissions caused Polaris to have a less than stellar single pipe on their RMK and Dragon 800s. But this is similar to the Cat F1000 that was delivered to the consumer with a Ypipe a dozen HP down from what D&D and others came up with. The difference is Cat didn't advertise "good Ypipe" HP, so no one complained about paying D&D $200 for an extra 10-12 HP. But there seems to be some sort of uprising among Dragon 800 snow-checkers demanding 154 HP out-of-the-crate.