Another cal/setup question

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GWPOS
Posts: 178
Joined: Mon Aug 24, 2009 2:47 pm
Location: Yucaipa, Ca

Another cal/setup question

Post by GWPOS »

I did a fast setup followed by a tilt cal and then a ride cal. I know my cda should be around the mid 300's (.350) but after my cal ride I did do some coast downs and got some really strange and/or high numbers for cda. I have posted the cal ride file and 2 other short out and back files. Just trying to make sure I get the right numbers in my unit. Would anyone like to take a look at the files for me? Thanks
120621_cal_data.ibcd4m
(492.25 KiB) Downloaded 263 times
iBike_06_21_2012_0628_4_Miles_CalRide.ibr
(69.6 KiB) Downloaded 293 times
iBike_06_21_2012_0703_2_Miles.ibr
(35.38 KiB) Downloaded 272 times
GWPOS
Posts: 178
Joined: Mon Aug 24, 2009 2:47 pm
Location: Yucaipa, Ca

Re: Another cal/setup question

Post by GWPOS »

Here is the last short out and back to go with the first 2.
iBike_06_21_2012_0710_2_Miles.ibr
(25.93 KiB) Downloaded 302 times
Velocomp
Velocomp CEO
Posts: 7793
Joined: Fri Jan 11, 2008 8:43 am

Re: Another cal/setup question

Post by Velocomp »

Lots of things are going on here:

1) you're riding in a place where there is a small but continuous uphill/downhill. For Cal Ride it's no problem; below is your cal ride data. It looks like you ride uphill, then turn around and go back.

2) For coast downs, even small hills can be a big problem. It's difficult to do coast downs on a non-level road. For good results you have to ride uphill, finish the coast down, ride back to the original starting point, and repeat. It's a pain to do coast downs; this is why we have reemphasized it so much.

3) Your measured CdA (.478) is too high. The Est CdA result is much better (around 0.35). I would create a new profile, using the Isaac software Setup Assistant. You should be able to preserve your Cal Ride measurements.
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Screen Shot 2012-06-21 at 12.48.20 PM.png
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John Hamann
GWPOS
Posts: 178
Joined: Mon Aug 24, 2009 2:47 pm
Location: Yucaipa, Ca

Re: Another cal/setup question

Post by GWPOS »

Ok, I did change my cda back to .350 already. If I use the other 2 short out and backs and do the "check cal", what would my wind scaling be? I took the cal ride and the 2 out and backs and got the average wind scaling between the 3. I beleive it came out to .727. Does that seem right? And the tilt was "-0.7 I guess also. Do these numbers look good then? Thanks.

My old gen 3 would show no power on downhills most of the time. The Newton was right after the cal ride so so far I am pleased. thanks again
GWPOS
Posts: 178
Joined: Mon Aug 24, 2009 2:47 pm
Location: Yucaipa, Ca

Re: Another cal/setup question

Post by GWPOS »

On another note, I did my coast downs after finishing the cal ride. I was doing them going up about a 1% hill, then turning around and going back down to the same spot and then would do another one in the same place I did the previous ones. It still gave me really high cda numbers. Why??
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