Jadus dyno session 2.0
I'll start by saying this, the day was a mix bag of feelings - sometimes stoked, sometimes gutted. If you were looking at numbers alone, things are not that impressive - gutted, but, as with what most dyno sessions show and tuners say, it is a relative thing, i.e.. what did you start with, and what did you end up with? In this case, the graphs and the gains were strong and I was pretty stoked.
Right off the bat things didn't go to plan. The rear tyre was out of round and bounced on the dyno drum and the stock suspension on these sr’s is shit so the thing was bouncing pretty bad and giving pretty bad readings. This makes the power curve bounce a bit at the top and affect clear readings on how the carb should be adjusted.
Once we got things somewhat sorted - tightened straps, established which gear to do our pulls in (in contrast to last time where we just did 5th gear pulls all day) and then did some roll ons from 30kph-105kph in 3rd. Plus some gear ups - throttling hard all through the gears.
I had made a spreadsheet with columns to fill in for jetting settings and a full days test plan - with exactly which tests I would do and how. It went like this:
Test 1: Completely stock - 2 pulls to confirm
Test 2: Add Jadus header and silencer - stock everything else, tune to strong AFR’s, get reading
Test 3: Add K&N filter to carb - remove airbox, tune to strong AFR’s, get reading
Test 4: Remove K&N filter and add Jadus intake bellmouth and foam filter, tune to strong AFR’s, get reading
Test 5: Add Jadus ignition advance brackets and tune to strong AFR’s, get reading
At this point, it is possible that this could be the final Jadus kit, so best power could/should be achieved at this stage.
Test 6: Swap carb (with same jetting) to one with the butterfly shaft mod, tune to strong AFR’s, get reading
Test 7: Swap out cam sprocket and install with 4 degrees advance, tune to strong AFR’s
Test 8: Adjust cam sprocket so it has 8 degrees advance, tune to strong AFR’s, get reading
Test 9: Add Jadus harmonic intake, tune to strong AFR’s
YEAH, NAH. That didn't happen and became apparent within the first half hour that this is not how things work. It is just such a time consuming process to do the tuning and swapping of parts that this plan went right out the window!
I'll start by saying this, the day was a mix bag of feelings - sometimes stoked, sometimes gutted. If you were looking at numbers alone, things are not that impressive - gutted, but, as with what most dyno sessions show and tuners say, it is a relative thing, i.e.. what did you start with, and what did you end up with? In this case, the graphs and the gains were strong and I was pretty stoked.
Right off the bat things didn't go to plan. The rear tyre was out of round and bounced on the dyno drum and the stock suspension on these sr’s is shit so the thing was bouncing pretty bad and giving pretty bad readings. This makes the power curve bounce a bit at the top and affect clear readings on how the carb should be adjusted.
Once we got things somewhat sorted - tightened straps, established which gear to do our pulls in (in contrast to last time where we just did 5th gear pulls all day) and then did some roll ons from 30kph-105kph in 3rd. Plus some gear ups - throttling hard all through the gears.
I had made a spreadsheet with columns to fill in for jetting settings and a full days test plan - with exactly which tests I would do and how. It went like this:
Test 1: Completely stock - 2 pulls to confirm
Test 2: Add Jadus header and silencer - stock everything else, tune to strong AFR’s, get reading
Test 3: Add K&N filter to carb - remove airbox, tune to strong AFR’s, get reading
Test 4: Remove K&N filter and add Jadus intake bellmouth and foam filter, tune to strong AFR’s, get reading
Test 5: Add Jadus ignition advance brackets and tune to strong AFR’s, get reading
At this point, it is possible that this could be the final Jadus kit, so best power could/should be achieved at this stage.
Test 6: Swap carb (with same jetting) to one with the butterfly shaft mod, tune to strong AFR’s, get reading
Test 7: Swap out cam sprocket and install with 4 degrees advance, tune to strong AFR’s
Test 8: Adjust cam sprocket so it has 8 degrees advance, tune to strong AFR’s, get reading
Test 9: Add Jadus harmonic intake, tune to strong AFR’s
YEAH, NAH. That didn't happen and became apparent within the first half hour that this is not how things work. It is just such a time consuming process to do the tuning and swapping of parts that this plan went right out the window!