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excellent midrange Airflow CFM and HP improvements

.Last Sunday we were dyno tuning Dustin Unverdorben''s brand new F7/ F9 EFI, a complete sled purchased from D&D, F8 stroked to F9, with monster twin pipes, fuel pressure booster, pac, and eqaulizer. After doing part throttle high load midrange we saw deathly lean...

here are the actual numbers of stock sleds prior to woodgate field shootout, thank you SnowWeek

today we dyno'd D&D's F7 bone stocker with their new twin pipes feeding into stock quiet muffler. Great results to be posted on DTR and on D&D's website. after F7, D&D installed a stock D&D F8 top end (they hadn't dyno tested that combo with new quiet...

We lucked out today, checked compression it was fine, the same on each cylinder. So we popped the flywheel off, and found the .020 offset key in backwards, effectively retarding the timing @5 or 6 degrees from where it was supposed to be. So reinstalling the key...

Sorry about confusing new subscribers with these quick-for-me-to-upload SFD files. Go to www.superflow.com, click on free windyne software download, then you're all set to view SFD files on DTR. Open articles w/ SFD files, click on one SFD file, it opens automatically...

broken printer, no 3.5″ discs, this is the easiest way to get these guys their data, plus it is interesting…

Gary's brand new 05 F7/ F8 EFI is way low on torque/ HP. With new DD twins it pretty much maxed out at 109 LB/FT and 166 HP at 12/1 A/F ratio. Aiflow CFM is fine, crank has not twisted out of phase. Thinking maybe the pipes were off the mark we installed Gary's stock...

SLP trail mod single pipe, SLP stock engine twin pipe ZR900 Cat

Weekdays $125/ hr from overhead door opening to overhead door closing. Saturday/ Sunday add $25/hr. Setup time on F7s is usually 30-45 minutes if sled arrives w/o clutches and w/o hood, breakdown is 15 minutes. Max setup/ breakdown is one hour (in case I'm fumbling...

We lucked out on the weather, could have been monsoon rain but it turned out to be very light mist so we had a good crowd of observers. The SnowWeek guys were great to work with, they are pleased to be partnered with DTR and the Adirondack sled dealers. They'll have a...

We finished the Shootout dyno cert yesterday, everything came in within reasonable expectations. SnowWeek is publishing the "official" dyno numbers in about two weeks. In deference to SW we won't post numbers. It would help promote the continuation of the SW/DTR...

We started out "freeview" testing our live streaming audio/video Sunday while testing consumer MachZ. By mid test the website suffered from viewer overload, and it shut itself down. Then Monday, when we were dyno certifying the Doos and Pols the same thing happened....

I'm only listening to the webguys, but our local server may be overwhelmed with overwhelming simultaneous viewing. On Sat everyone was OK initially where we looked like Max Headroom. But as more people logged on, the time delay increased to the point that it finally...

We blasted away at another 05 F7 today, with cameras lit up. This one was excellently lean, 42 psi idle fuel pressure, 96 lb/hr at peak, 141+ HP with stock timing! No need for fuel choke here. The cameras worked for an hour, then locked up due to a fried junction box....

We're online now with DynoCams, complete with high buck sound. Take a look on the free side of our website. We'll leave it on free view this weekend,  everone gets to see dyno hookup of an 05 F7, then tuning to max HP. This will be either Sat 1 PM EST or Sunday 9...

We dialed in another 05 F7 today, had 2 degree key and a D&D PAC. For a 500 ft drag spec Chris made 150.5 HP at 40 PSI on his PAC gauge (= 38 psi on my dyno gauge). Dropping pressure lower than that ran too lean-- dropped HP. These all really need to be dyno'd...

Today I just dyno tuned another couple of very hot F7s from MA/ NH. One had too much HP, 93 lb/hr fuel flow (compared to 110-115 expected at this temp here). The other has almost as too much HP, 96 lb/hr. I will try to post some of these hotrods this weekend. I have...

Recently completed some more dyno tuneups with 05/04/03 F7s. Several have proven to be  what I call "hot" F7s--very low fuel flow and apparently advanced ignition timing. The latest,  most powerful yet (fitted with a 2.5 degree key but otherwise stock) made...

I just finished initial dyno testing of my cousin-in-law Bill Roger's new Fusion. And since I'm measuring airflow CFM to compare to fuel flow lb/hr I have some very good, very promising info that I will post tonight or tomorrow AM! Sunday Bill and I are going to try...