Got an updated dyno run today, with the current tuning configuration...not an optimal dyno testing weather day, as winds were gusting and BP was falling, but hey, it was dry, and I had to get it done while I had the time.
Current tuning:
07 SM 865/270
Stock heads & pistons
TPUSA 813 cams
TPUSA/TTP +3 8250 RPM "Pieman" Igniter
PVL (Nology) coils
IX plugs & TPUSA Magnecor wires
Short tapered TORS, inlet derestricted
OEM intake manifolds & spacers, lightly ported
Uni UP4229 pods mounted on modified Mikuni RS "50mm" de-horned velocity stacks (41mm OAL on the modded v-stacks)
TPS connected
ACV enabled
Keihin OEM 150 mains
NBZT needles, no shims
Keyster 40 pilot jets
Pilot screws about 3&1/3 turns out port side, about 3&3/4 turns out starboard side
Yamaha FZ1 Vacuum piston slide springs, cut to 88.9mm/3.5" OAL
Polished slides, slide vacuum port air holes drilled to 2.53mm (#39WG drill bit)
1.2mm throttle plate butterfly air bleed holes
18.5mm (or so) float heights (fuel level below gasket surface)
Sunoco 87 non-E gas + a splash of Lucas Octane Booster
Dyno sheet:
The guy who did the testing wasn't the usual tech; I wasn't able to see how he ran the throttle, however just by listening to the way the motor spooled up, I don't think he followed my instructions of being smooth on the roll-on...it sounded to me like he whacked it open. It matters. That said, I accomplished what I wanted from the run.
The pipes are different from the prior run posted above, and some of the carb tuning parameters are different.
The TORS enable a little more mid-range, at the cost of a little peak power.
The numbers are hard to read in the image, so here they are in text:
Max SAE corrected HP: 68.40 (down from prior run)
Max SAE corrected TQ: 50.43 (up from prior run)
Why are "red" and "blue" runs shown? That's just the way the dyno operator printed it...bike was tuned the same for both runs, & as a practical matter the outcomes are the same...DJ dynos have a range of "repeatability"...multiple runs are not expected to be identical, however, once the motor is up to temperature, all other things equal, the runs ought to be similar.
What the dyno doesn't show is the qualitative performance of what from my perspective is excellent balance of performance, fast starts, quick warm-up, great driveability, & excellent fuel economy.
I have another set of custom long stainless pipes that I want to test, which I think can do better on the top end, without hurting midrange. Just need to find the right baffles first...
