Pictures work (thanks).I've re-uploaded the attachments and re-linked them anew. Try it again, please.
Pictures work (thanks).
Zipfile still insists on being an unopenable *.php file, whatever that is.
Norm
Win 8.1, IE 11.
I get the box where I can opt to open, save (or save as), or cancel. Selecting either open or save results in a little box flashing up on the screen that immediately disappears. I have no clue what (if anything) has happened, no idea if anything downloaded, what its name might be, or where in some ridiculous number of GB Windows decided to put it..
No worries on that. We'll figure it out, it's just a matter of getting it to a point where it's doing something obvious.Communications/connectivity software is a big mystery to me, and I'm unwilling to make matters worse for myself by loading a second browser and struggling with it and any potential conflicts with IE that at least doesn't bite me in the ass like this too often. Sorry for ranting . . .
I think I finally have it . . . and what a PITA just to get a bunch of numbers.
The *.mcr files are the original raw files I was given by the dyno shop. You can open them with the Roehrig Engineering software I linked to (indeed, I don't know of anything else that can open those).The *.csv files I get, but what are those *.mcr and *.mcr.xml files?
Math is hard.
Can someone figure out what the position (turns from full soft) 65% is for some of the common springs that are out there?
Such as:
Steeda Sport
Steeda Comp
Ford K
Eibach Pro
Copied from another forum.
Eibach Pro-kit (pn 35101.140) / Ford Racing (K-springs) (pn M-5300-K) 1.5/1.7 - both variable front: 173-248lb/in / rear: 195-236lb/in
Steeda Sport (pn 555-8216) 1.0/1.25 - front: 200lb/in / rear: 175lb/in
Steeda Competition (pn 555-8241) 1.0/1.25 - front: 225lb/in / rear: 185lb/in
Again let me point out I'm not telling you to NOT think about things like you want too. Just don't put so much damned stock into them because it will bog you down. And remember while I don't personally know you, I did get a debrief about how things went in general, including the conversation about how you can't talk while driving and it messes you up, etc.... but then you nailed a slalom while... telling Shelly that. Keep the brain clear. Apply your lessons well and you might find you don't need to think so hard about how things are happening with the car.
kevin=> select location, pass, avg(rate) as rate
from (select substr(shock, 1, 1) as location,
pass, avg(forcediff / speeddiff) as rate
from shockdampingdiffs sdd join shockcurveattributes sca
using (shock, pass)
where type = 'rebound' and speed > 2 and speed < 3
and sample >= first and sample <= last
and abs(speeddiff) > 0
group by shock, pass order by shock, pass) t
group by location, pass order by location, pass;
location | pass | rate
----------+------+-------------------
f | 0 | -28.5252852953472
f | 1 | -28.7219906633222
f | 2 | -29.9974361032989
f | 3 | -32.7627499977644
f | 4 | -32.2284162702381
f | 5 | -34.1830667583725
f | 6 | -35.7649128091112
f | 7 | -40.603480414513
f | 8 | -42.288092948718
f | 9 | -44.3218941610925
r | 0 | -20.9190039082295
r | 1 | -23.3490962959941
r | 2 | -25.8289492753623
r | 3 | -28.8198268077564
r | 4 | -32.6267659084575
r | 5 | -39.6733845662011
r | 6 | -45.7631262193423
r | 7 | -53.8557304493514
r | 8 | -58.5020354240815
r | 9 | -68.3945583427389
(20 rows)
[FONT=Courier New][SIZE=1][SIZE=2]Type Front Rate Rear Rate Front CD Rear CD
-------------------------------------------------------------------------------
Steeda Sport 200 175 47.0 36.8
Steeda Competition 225 185 49.9 37.8
Ford K Springs 173-248 195-236 43.7-52.4 38.8-42.7[/SIZE]
[/SIZE][/FONT]
Outstanding! Excellent work. I vote for a sticky of critical damping with various spring rates and Konis here in the corner carving section we can add to in the future. It would be an excellent reference for people wanting a base line with their Koni setup.
The dyno runs cost me about $20 for each damper. Not bad, really. I highly recommend you get your dampers dynoed if it's not too inconvenient.Just wish I had some dyno plots and data for the GC konis to compute CD for my setup...
Here's the critical damping values I get for the springs that were mentioned so far:
So for the Steeda Sport springs, front 65% critical is 30.6, while rear is 23.9, which corresponds to 3/4 turn from full soft up front, and 1/2 turn in the rear (those get you about 70% critical).Code:[FONT=Courier New][SIZE=1][SIZE=2]Type Front Rate Rear Rate Front CD Rear CD ------------------------------------------------------------------------------- Steeda Sport 200 175 47.0 36.8 Steeda Competition 225 185 49.9 37.8 Ford K Springs 173-248 195-236 43.7-52.4 38.8-42.7[/SIZE] [/SIZE][/FONT]
For the Steeda Competition springs, front 65% critical is 32.4, while rear is 24.6, which corresponds to 5/4 (i.e. 1 1/4) turn (for 69% critical) and 1/2 turn in the rear (for 68% critical).
For the K springs, it's going to depend on what the actual working rate of the springs is. The front adjustment range target is from 28.4 to 34.0, which is anywhere from 1/4 turn to 5/4 turn. The average gets you 3/4 of a turn. The rear adjustment range target is from 25.2 to 27.8, which is anywhere from 1/2 to 3/4 of a turn. I'd probably leave that at 3/4 of a turn (a value of 28.8) which puts you at 74% critical damping even for the low end.
There's probably enough variability in the actual rates you'd get from your shocks that these settings would be ballpark anyway, but it should be clear that getting sufficient damping to properly control the rebound doesn't take much adjustment above full soft in the general case for these performance springs. Note how the front isn't able to even get to full critical damping for the Steeda springs, at least for the speed range here (2 to 3 inches/sec), and is barely able to get past critical for the softest part of the Ford K springs.
So it looks to be impossible to overdamp these performance springs up front, but relatively easy to achieve good damping. The rear is another matter. There, you may have to be more careful about your settings, as the damper is capable of going up to at least 160% of critical for even the stiffest range of the K springs.
Note that I'm presuming a motion ratio of 1.0 for the rears. That is almost certainly incorrect, but I don't have data on the angle of the dampers, so I can't compute what motion ratio to use back there. Complicating the matter is the fact that the wheel rate from the springs, which I've been presuming to match the spring rate on the basis of a motion ratio of 1.0 in double-wheel bump, probably changes in single-wheel bump. Norm should be able to give us some idea of what motion ratios to use for these various scenarios, and he may even have angle data (and thus motion ratio data) for the rear dampers.