Author Topic: Rostra Cruise Control Surging  (Read 10030 times)

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Offline Fred_Harmon_TX

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Re: Rostra Cruise Control Surging
« Reply #25 on: February 27, 2016, 05:07:44 pm »
I looked at how you attached your cable to the throttle, and that may be part of the reason yours feels too responsive.  I think folks have had the best result by attaching to the very end of the arm on the throttle pulley, as this reduces the amount it moves the throttle. The further out on the arm you attach it, the smoother the result. Some have even extended the arm, as mentioned in some of the posts above.

I believe that by attaching to the throttle pull cable like you have done, is going to make the response too sensitive.  I'd suggest you move it.

Here is where mine is attached. The cable pulls DOWN from the bottom, and it has plenty of travel to keep the bike at any speed I want.

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Offline jawneelogik

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Re: Rostra Cruise Control Surging
« Reply #26 on: February 27, 2016, 06:59:49 pm »
I'm beginning to think you are right.  I didn't realize it would be quite so sensitive, but by attaching to the end of the the arm or an even longer arm it will reduce overall loop gain in the system.

The problem I have now, although minor in the big picture, is that I will have to fabricate an entirely new bracket, as the original has been cut and bent to the point of being unusable in any other position.  Oh well.

Thx, John
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Offline MikeB_CA

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Re: Rostra Cruise Control Surging
« Reply #27 on: February 27, 2016, 07:21:07 pm »
I looked at how you attached your cable to the throttle, and that may be part of the reason yours feels too responsive.  I think folks have had the best result by attaching to the very end of the arm on the throttle pulley, as this reduces the amount it moves the throttle. The further out on the arm you attach it, the smoother the result. Some have even extended the arm, as mentioned in some of the posts above.

I believe that by attaching to the throttle pull cable like you have done, is going to make the response too sensitive.  I'd suggest you move it.

Here is where mine is attached. The cable pulls DOWN from the bottom, and it has plenty of travel to keep the bike at any speed I want.




I agree, think it's best if the cable is directly beneath the arm and out to the end of the arm. I have mine mounted the same way!

Offline Bigfoot_16

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Re: Rostra Cruise Control Surging
« Reply #28 on: February 27, 2016, 08:00:36 pm »
The problem I have now, although minor in the big picture, is that I will have to fabricate an entirely new bracket, as the original has been cut and bent to the point of being unusable in any other position.  Oh well.

Thx, John
Just go to Home Depot and buy a new bracket blank with holes in it. You'll have to reroute your cable, too, but you know that already.
Jim

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Offline C14lvr

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Re: Rostra Cruise Control Surging
« Reply #29 on: February 28, 2016, 11:00:30 am »
Pls disregard in my last post where it says "I don't have a foto bucket."  I do now.

I am a bit baffled though cuz I have seen numerous other posts here where people have embedded fotos into their posts.  ???

John
This works well for me.
Don't know about Rostra's but my Audiovox's work smooth down to 30mph or so on an FJR & a WeeStrom only counting ignition pulses as the clock.


Clearification on 2 points here:
1) Rostra claims initial engagement speed as low as 33 mph. My real-world test concurrs.

2) The Audiovox 100 is not an electronic cruise, but rather uses vaccuum.
 It also differs from the electronic Rostra system by allowing the Audiovox to read ignition pulses (coil) as he mentions here. The Rostra cannot. PPM are read 2 ways by a Rostra- VSS, (digital square wave input), or coil/magnets, (analog sine wave input.) I've successfully installed an Audiovox 100 system on a 1999 Honda Valkrye, that has the 6 carbed 1500 GW engine. Worked perfectly, using coil pulses for the input.

Another previously asked question concerned if anyone had calculated the PPM train.
The short answer is yes. VSS number will be slightly less than 38,600 PPM (or 24,000 PPK.) What the exact number is, I don't have the answer. I just know it works using these dip switch settings, and has never been an issue. As long as the PPM train value falls into the range w/o exceeding the numerical value of the setting combination of switches 3-6, it works, and 38,600 ppm settings for VSS is the setting that was chosen for the C14. It also works for the 2005 BMW R1200GS.

When using a coil/magnet analog setup, we calculated the PPM to be around 4800, (best I can recall) on the RT & GS.

Using google, you can find a site that will tell you the number of feet (whatever the OD of your tire size is) that it travels when turning one revolution, and you can mathmatically calculate that into one mile, etc.
I've used this method to acquire the ppm settings for the 2004 BMW 1150RT, which has no VSS.
This setup utilized 5 neodynium magnets, one placed in each front rotor bolt head, with the coil mounted via a bracket to the fork. The 5 magnet points factor into the mathematical equation.

Also, concerning the speed of initial engagement time... the amount of slack in the Rostra cable can make a difference. The angle of approach in which the cable is installed can factor. If the mounting bracket you install at the throttle cam attachment point moves (is not solidly in place,) it can affect it.
I have also noticed that you need to give the system a few seconds between the time you first power it on, and trying to set the cruise. If you turn it on and immediately try to set, it usually won't w/o a little bit of wait time.

I also have my #2 switch turned on, which makes it engage faster. But, I've also noticed an increase of surging, at times, upon engagement, and depending upon the terrain. I've learned not to try to set the cruise when ascending/descending a hill. (Can surge.)

I know a lot of this info I've posted has been additional info, and may seem unnecessary by some, but I felt this might benefit someone else down the road, and help give further insight for troubleshooting.
Just some things I've learned along the way, and thought I'd share for future reference.
Bob
« Last Edit: February 28, 2016, 11:24:42 am by C14lvr »
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Offline jawneelogik

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Re: Rostra Cruise Control Surging
« Reply #30 on: February 28, 2016, 01:53:54 pm »
@C14lvr,

Thx.  Your confirmation of those 2 parameters (PPM and sqr/sine) helps to unclutter my thinking.  The other 2 gentlemen Daytona Mike and Zarticus mentioned, as a solution to any"twitchy-ness", lengthening the arm that extends passed the throttle pulleys before attaching the control cable,   This would decrease the sensitivity of the system.  As I have done everything else according to the "standard recipe", I intend to give it a try.

UPDATE:  Found a picture that Daytona_Mike had posted of his ctrl cable attachment and now see why his is behaving as he says.  By extending the cable attachment point so far out, he has effectively halved or more the system gain from what my connection point is.  So, the actuator can move significantly more and the throttle will move very little.
« Last Edit: March 02, 2016, 08:01:23 pm by jawneelogik »
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1985 Suzi GS1150, 1982 Suzi GS1100
1978 Suzi GS1000, 1975 Kawi 900
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Offline C14lvr

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Re: Rostra Cruise Control Surging
« Reply #31 on: February 29, 2016, 03:58:06 am »
Cool, John.
I sincerely hope you get yours working correctly!
You'll love this, once you get the bugs worked out.

Coolest farkle I've added. I use mine all the time, and love it.
I also do long range touring /trips a lot with other guys who ride older bikes with only throttle locks.
They always ask me to take the lead and set the cruise!
We actually get better fuel economy, and make better time, while saving us from a lot of tickets!

Hope some of the things we covered helped you get the problem solved!
Ride safe!
Bob
2011 C14 ABS (current bike)
1982 Yamaha XJ1100J (sold)
1979 Yamaha XS11 (3200 original miles)
In the warden's words from Cool Hand Luke;
"What we have here is a failure to communicate."

Offline jawneelogik

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Re: Rostra Cruise Control Surging
« Reply #32 on: February 29, 2016, 02:57:00 pm »
C14lvr,

I am of the opinion that CC should be a mandatory component on every vehicle.  I don't travel more than 10 miles on any highway without engaging it on my vehicles so equipped.

cheers, john
2010 Kawi ZG1400ABS, 2000 Suzi Bandito 1200s
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1978 Suzi GS1000, 1975 Kawi 900
1973 Honda CB350F

Offline SilverConnieRider

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Re: Rostra Cruise Control Surging
« Reply #33 on: February 29, 2016, 10:24:47 pm »


Coolest farkle I've added. I use mine all the time, and love it.
I also do long range touring /trips a lot with other guys who ride older bikes with only throttle locks.
They always ask me to take the lead and set the cruise!
We actually get better fuel economy, and make better time, while saving us from a lot of tickets!


Bob

I prefer to lead also, only exception is if I didn't know the area  Other wise just like you I would rather lead.
I have found that if someone else leads with no cruise control I'm often adjusting mine or cancelling it or turning it off
because they can't keep a constant speed.  No one (not even me) can compete with a true cruise control -
my cruise (on my bike) works even better than my 4 wheel vehicles.  :great:

C14lvr,

I am of the opinion that CC should be a mandatory component on every vehicle.  I don't travel more than 10 miles on any highway without engaging it on my vehicles so equipped.

cheers, john

MOST people would welcome a cruise control on any bike - and as I have stated before there is no law you have to use it if your didn't want to.
For some reason there are some people that don't want a cruise.  I have to believe that they have never tried one, but it's their choice.

I set mine as soon as I get up to speed, as when I leave my driveway it's a 55 zone.  City driving is when I use it the least.
However my McCruise will set as low as 22 mph (35 kph) so in a 25 mph school zone I have actually set it when traffic was light.
As they double the fine if you get caught speeding in a school zone.

OK back to the regular thread topic.   :truce:

Offline jawneelogik

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Re: Rostra Cruise Control Surging
« Reply #34 on: March 02, 2016, 07:43:43 pm »
Attention any and all who have followed/contributed to this thread.

I can't believe I'm actually asking this, but I have somehow misplaced a critical part needed in my installation and am appealing to anyone that might NOT have used this particular part for their own install.

The part I'm needing is the "bead chain eyelet coupler."

If anyone still has theirs and is not intending to use it, please PM me (that is if you are interested in selling it.).

Thx, John
2010 Kawi ZG1400ABS, 2000 Suzi Bandito 1200s
1985 Suzi GS1150, 1982 Suzi GS1100
1978 Suzi GS1000, 1975 Kawi 900
1973 Honda CB350F

Offline Sailor_chic

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Re: Rostra Cruise Control Surging
« Reply #35 on: March 03, 2016, 01:08:15 pm »
I dont have one of these available. I know of a cruise control business that sells Rostra's on eBay. Perhaps they will have the part that you need.

http://www.ebay.com/usr/kartronix
Nicole     Port St Lucie, FL.
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Offline MikeB_CA

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Re: Rostra Cruise Control Surging
« Reply #36 on: March 03, 2016, 02:52:10 pm »
Attention any and all who have followed/contributed to this thread.

I can't believe I'm actually asking this, but I have somehow misplaced a critical part needed in my installation and am appealing to anyone that might NOT have used this particular part for their own install.

The part I'm needing is the "bead chain eyelet coupler."

If anyone still has theirs and is not intending to use it, please PM me (that is if you are interested in selling it.).

Thx, John

I might...I'll check when I get home tonight.

Offline denver6

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Re: Rostra Cruise Control Surging
« Reply #37 on: March 05, 2016, 01:32:00 am »
...Some have even extended the arm, as mentioned in some of the posts above...

I would like to see how some have extended the arm. Are there any pics of that? Or a description? Thanks!  :) :) :)
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Offline Zarticus

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Re: Rostra Cruise Control Surging
« Reply #38 on: March 05, 2016, 01:56:57 am »
Attention any and all who have followed/contributed to this thread.

I can't believe I'm actually asking this, but I have somehow misplaced a critical part needed in my installation and am appealing to anyone that might NOT have used this particular part for their own install.

The part I'm needing is the "bead chain eyelet coupler."

If anyone still has theirs and is not intending to use it, please PM me (that is if you are interested in selling it.).

Thx, John
I used the supplied cable instead of the chain
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Offline Zarticus

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Re: Rostra Cruise Control Surging
« Reply #39 on: March 05, 2016, 02:02:02 am »
...Some have even extended the arm, as mentioned in some of the posts above...

I would like to see how some have extended the arm. Are there any pics of that? Or a description? Thanks!  :) :) :)
:beerchug:
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Offline denver6

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Re: Rostra Cruise Control Surging
« Reply #40 on: March 05, 2016, 02:09:08 am »
Thanks. Simpler than I imagined.  :beerchug:
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