NefMoto

Hello,

Has any one got any information on 'DBW throttle with cable response' that some tuners are offering.

I gather there must be some maps to tweak to sharpen up the slow throttle response on the DBW

Thanks in advance

They're 100% junk.

typical response, nye!

basically linearizing the pedal map so that it takes more pedal travel to get equivalent throttle movement. great for track use or for someone who doesn't like the touchy pedal. they don't sell well cause most people drive it and think the car is slower since they actually have to push the pedal more. also, MED9 has many throttle 'tightness' maps that control rate of change of throttle body. those are quickened over factory.

Setting the requested air charge to match LDRXN earlier in KFMIRL map would do the trick I guess(?)

or the ones that remap throttle response by sitting in between the accel pedal and the ecu lol

Ok... So good or bad. Can the throttle be 'sharpened' up? Can some one point me in the the right direction.. Or has it been tried and tested.. And failed

If by sharp you mean "terrible"... yes.

You can't make it any "faster"

 ;) ok got it!

KFPED if you want to alter your pedal vs throttle relationship
its very non-linear as std

I have reverted mrs lupo to linear and its so much smoother to drive now.. almost 1:1 on map now.

Which tuners that?? 

As above make KFPED 1:1, but you might want to advance it a little at the points where you pull off in first gear to give a little DBW feel assistance.

I have been working on this with some Focus ST owners who have throttle pedals like on/off switchs, so far the results as very good better drivability and one guy seeing around 50mile extra per tank of fuel..

I think it is sold a Linear DBW throttle.....

I will have a look at just making it linear after around 2000 - 2500 RPM, just as a tester

OK, almost there.  Please show us an edited map you'd suggest we run;

Me then..... ;D

Me then.... ;D

Yeah probally is then :)

I tried to make it linear from 2500 - 6500 rpm, missing the first lower 3 points in each RPM range.

Must have cocked something up as it seemed to increase the idle to 2000rpm!! :)

Anyone fancy posting a map up??
 

post your map up I will do a quick basic one as a starting point for you.

Nick

Here's what I use on my 2.7T linear throttle files. Road racers like it, drag racers hate it. :)

Cheer Nick, will do when I get home

Thanks very much, I will have a look

lupo's one below for ref.
(http://www.badger-5.com/bin/Lupo/lupo-kfped-3d.JPG)
(http://www.badger-5.com/bin/Lupo/lupo-kfped-txt.JPG)

In any ecu, you can change
KFPED
KFPEDL
KFVPDKSD
KFVPDKSE
KFMSNWDK
KFWDKSMX
NMXDAEF
to make pedal more "aggressive"
You have to change and the KFMIRL to "ask" for more pressure...

Hello,

This is the standard KFPED on a 1.8T CB ECU.

RPM Across the Top
%PED down the side

0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00
20.89   10.76   3.16   1.84   1.82   1.42   1.40   1.40   0.96   0.92   0.86   0.69
30.97   18.23   7.99   4.79   4.36   3.90   3.50   2.72   2.30   1.89   1.61   1.89
41.79   30.56   19.64   12.81   12.07   11.14   9.89   7.15   5.85   4.91   4.42   4.45
53.88   41.32   29.27   20.56   19.18   18.50   17.12   12.43   10.87   8.96   8.43   7.81
66.66   55.15   42.04   28.92   27.16   26.40   24.95   19.09   17.32   15.23   14.48   13.83
77.90   66.38   52.49   38.29   35.87   34.85   33.84   27.98   27.11   25.15   23.70   22.38
86.26   76.88   63.15   48.82   46.04   45.89   45.01   39.54   39.02   36.54   34.18   32.78
91.98   84.77   73.04   59.74   56.94   57.52   56.75   52.75   52.21   50.29   47.83   46.27
96.13   91.86   83.36   72.01   68.98   70.42   69.25   64.95   64.36   61.02   58.91   57.30
98.90   96.03   91.01   83.39   81.39   83.07   82.28   78.38   78.45   75.26   72.99   71.04
100.01   98.94   96.91   92.79   91.63   92.51   92.30   88.79   89.04   85.65   83.51   81.55
100.01   99.57   99.10   97.40   96.56   97.51   97.26   94.53   94.77   93.47   92.24   90.70
100.01   99.99   99.96   99.87   99.80   99.73   99.23   98.05   97.98   97.78   96.83   96.56
100.01   100.00   99.99   99.97   99.95   99.93   99.83   99.44   99.43   99.36   98.90   98.94
100.01   100.01   100.01   100.01   100.01   100.01   100.01   100.01   100.01   100.01   100.01   100.01

Thanks

aka lumpy and non-linear as hell

Thanks for the maps, I will give the a whirl

NMXDAEF <- makes no sense to change as it is used only on emergency situations, when throttle plate is faulty
KFWDKSMX <- just set to FF and forget
KFMSNWDK (and inverse map KFWDKMSN) <- not sure what happens when we increase allowed air flow. I think we will get lean condition, but need someones input here
KFVPDKSE & KFVPDKSD <- are mystery maps to me. It would be real nice if someone would chime in on these maps and what affect they have on throttle plate.
KFPED <- THIS IS YOUR MAIN MAP TO INCREASE RESPONSE
KFPEDL <- this is only for faulty pedal

IMO, none of those maps are what you want for a 'snappier' throttle response.

Aside from the throttle limit map, you want to focus on MDFAW.

dont know why i didnt think of it before, but adjusting KFPED to be more linear might make my car a bit easier to drive in the snow.

So if I'm reading Barks' map correctly from above, as rpm increases the target throttle position decreases with constant throttle input?  Why would you WANT that?

its not target throttle position tho... but requested torque relative to pedal position

That is actually what happens in a cable throttle system. To put it another way, think of the throttle as controlling airflow (or power), NOT torque. At a constant airflow value, torque drops as engine speed rises, but very roughly, engine power stays close to the same, at least on a naturally aspirated engine. That is sort of a 'rule of thumb'. It is actually quite difficult to get a good pedal feel, in my software we went from a 12x12 pedal map up to a 20x24 pedal map because the chunky feel of a coarser map. A pedal map should actually be implemented using polynomial interpolation and not a linear surface interpolation, or better yet, a formula filled with cosine functions.