Locomotive Speed Matching for consisting

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CLEAN the Track -and- CLEAN the locomotive wheels. A group of MU'd locomotives may all be operating at Run 6, but unless all are pulling, there is lots of nosing and bumping going on as the locomotives travel down the track.

If you don't know the type of decoder in your locomotive you can put it on your programming track and read the value of CV 8. They both have their own good points. I have successfully matched TCS to TCS, TCS to QSI, QSI to QSI, TCS to Tsunami, QSI to Tsunami, and Tsunami to Tsunami … all with BEMF on! All you have to do is to consist them.

Locomotive Speed Matching for consisting

Since most model locomotives run at prototypically high speeds, and different models usually run at different speeds, it is worthwhile to match the speeds of your locomotives, especially if you wish to MU them in varying combinations. My method requires nothing more than a cheap stopwatch and 3 distance markers I use plastic bulletin board tacks with the pins cut off. This method applies only to decoders that allow changes to CV2 start voltage , CV6 mid voltage and CV5 maximum voltage. For extra fine tuning, it is also helpful if your decoder can handle changes to CV116 kick rate , CV117 kick strength and CV95 reverse trim. Step 1 - Adjusting the start speed via CV2 In Program on the main mode, I adjust CV2 until the locomotive just creeps at speed step 1 using 128 speed steps. If you can't get the loco to creep with CV2 less than 30, you might adjust CV116 kick rate to somewhere from 2 to 5 and CV117 kick strength to somewhere from 4 to 25 to overcome striction in the motor. If the loco creeps faster in one direction than the other, adjust CV95 reverse trim by using a value of 1 to 127 to increase reverse speed and 129 to 255 to increase forward speed. In both cases, start at the low number and move up. Step 2 - Adjusting top speed with CV5 and mid speed with CV6 Use your markers to measure out 2 distances along your track. I place my pins to set a maximum speed of 64 mph and a mid speed of 24 mph. With the mid speed less than half of the max speed, you get better control at low speeds. You can set your speeds wherever you want using the formulas given below. The formula for HO is simple: Distance inches to mark off for 5 seconds equals speed in scale miles per hour eg. For 24 mph, measure 24 inches between markers and for 64 mph, measure 64 inches between markers The formula for N-scale is a little more complicated, but not very: Distance inches to mark off for 5 seconds equals 0. For 24 mph, measure 0. The following speed settings given are for my NCE system using 128 speed steps. My maximum speed step is 126 and my middle speed step is 63. You will adjust yours for whatever DCC system you are using. Adjust CV5 to have the loco take 5 seconds to cover it. This is where the stopwatch comes in. If you've never tried to speed-match your locos before, try this method. It's fairly simple and the rewards are great. Of course, you might have to go out and buy a cheap stopwatch i think the above method is good for working out scale speeds at throttle possitions, but when it comes to 'matching' loco speed i think it is better to run both loco's on the same piece of track and watch the gap. Besides, after setting the CV values as described, I have tested the locos in consists and they run fine. It depends on how closely they run together 'out of the box' I think. I've used the three CV's mentioned plus start and stopping momentum CV's to speedmatch engines so they run together very well. I generally run fairly slow passenger trains top out around 35 MPH so maybe it would be an issue if had to run from 0-70 MPH. BTW I just run the two engines together and adjust the CV's on one until the speed matches the other when starting, stopping and running. Once you have two running together, you can speedmatch further engines to either of the first two, and then all three can run together. Keep doing that and eventually all your engines will be able to run together mix-and-match. I've used the three CV's mentioned plus start and stopping momentum CV's to speedmatch engines so they run together very well. I generally run fairly slow passenger trains top out around 35 MPH so maybe it would be an issue if had to run from 0-70 MPH. BTW I just run the two engines together and adjust the CV's on one until the speed matches the other when starting, stopping and running. Once you have two running together, you can speedmatch further engines to either of the first two, and then all three can run together. Keep doing that and eventually all your engines will be able to run together mix-and-match. I have tried several ways to speedmatch and I have even done it in a complicated way. First of all it all depends on how accurate the speedmatch needs to be. I can't say I know that myself. I want to set the maximum speed to the prototypes maximum speed, for the locomotives I have that means 70 or 75 mph. I Started with timing the locos on a 2 m long part of my track. I became disatisfied with my ability to clock them accurate so I started time them for one complete loop 19 m which gave me less error starting and stopping the cellphone timer. The next thing to solve was to calculate how much I should adjust the Cv. I'm using DecoderPro to program my locos. The locos are equipped with Digitrax FX3 decoders and I use the speed table and the forward and revers trim. I try to set the maximum speed forward and reverse equal. I thought simple math should give me fewer trial laps. In order to help me keep track of all figures and settings i made a simple program to run on the computer. It's not simple anymore, mostly because I enjoy programming and I'm a better programmer than model railroader. If you are curious on my program you can find it at. Now I had a tool that should make it easy to set the speed I thought. But reality isn't always what you expect. After setting Cv values that should give me the correct speed I wanted to verify it. Then I noticed that the longer the locomotive has been running the faster it ran. I tried to find out for how long time they need to run to have a constant speed with the same settings on throttle and Cv:s. I have tried to run one locomotive for over four hours and it's not stable, the speeds varies with time. Have anyone noticed the unstable speed with the same throttle setting? My locomotives are all Kato SD70, SD80, SD90 or AC4400 N-scale.

Some guys use a number that is as high as 225 — and I ring one guy who uses something down around 150. You may find you have to turn off the BEMF — or you may not. It sat there like an 800lb gorilla, just teasing me. I get the low ends together by setting both locomotives on the track and running them together, then changing one speed matching ho scale locomotives it runs very very nearly the same as the other. If the second locomotive starts at a lower throttle setting, adjust its CV2 upwards to match that of the Master. Once things were setup and it came time to manipulate the CV's, things got easier. It will most likely run either faster or slower than the Master at this setting. The objective here is to get your locos to run in a consist — and have them all going at the same speed — i. I've used the three CV's mentioned between start and stopping momentum CV's to speedmatch engines so they run together very well. The following procedure will allow you to speed match them very well — and after you have done one or two of them you will be able to speed match your locomotives — in far less speed matching ho scale locomotives that it will take you to read this document. I have heard a lot of others complain how tough it is or how much of a pain in the ass it was, so I thought I would attempt to explain the method that I'm using to speed match my locomotives. Prime CV2 in increments of 1 unit the low speed is equal to Unit 1.