825 Race Demon:
(downleg .160” boosters)
60-100kp/h - 2.01 sec (had wheelspin so promising combo. Ambient 19c)
70-110kp/h - 2.02 sec (as above)
100-120kp/h 1.23 sec
850 annular after opening up pvcr from previous testing:
70-110kp/h - 2.05 sec (wheelspin again as only 13c ambient. Only test saved on that drive. Other two are videos below that don’t capture custom parameter data).
As it’s panning out various cfm carbs from 650cfm (1.28” v X 1.688” t) to 975cfm (1.500” v X 1.75” t) downlegs and an 850cfm annular (1.56” v X 1.75” t) are all performing quite similar under street driving conditions when tuned for similar AFR windows. However, they do feel slightly different during the test from smallest to largest cfm making the data a little surprising. Most would choose the 650 for its instant response feel but it appears throttle response has two factors. One, the obvious of time it takes for the engine to respond to the rapid throttle angle change and two - acceleration rate after engine responds. These two factors are balancing out over the cfm spread to be in the same ballpark under the test I am performing.
Not sure how many more of these test I’ll do now temps have dropped making them inaccurate and price of fuel gone through the roof (paying upwards of $2.20 a litre in Aus at the moment) and M/T tyre price and availability like rocking horse poop as well. I may move on to quarter mile testing.
Below is 60-100kp/h test with the 850 annular Mighty Demon with 16 hole BLP annular boosters and modified from stock emulsion and mab. Took a while to steady at 59kp/h.
https://youtu.be/2Vc7jVFqqu8
Below is 99kp/h WOT (100 - 120kp/h test). Time under acceleration gets to 128kp/h as gps display lags.
https://youtu.be/6wrGBJM58Lg
*The two above test did not capture dataStatistics: Posted by Right hand drive — Sun May 29, 2022 5:28 am
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