SuzukiSavage.com - Tech Question

tankerblaze

Ex Member

Tech Question - Speedometer
01/16/06 at 22:38:29

Hello all...

Simple question, not so simple to find answer:

Speedo cable RPMs at 60 mph?

I'm looking to replace the speedo with one from Autometer. Aside from looker much more badass, their mechanical speedos also feature trip meters, something I've wanted for some time. Autometer already has an outsource shop that makes adapters to change the speedo cable ratio to whatever I/we need, but I can't find the data anywhere...

-tanker out

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Hammy211 Ex Member	Re: Tech Question - Speedometer Reply #1 - 01/16/06 at 23:52:41 Scroll down!!
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torque Serious Thumper 2005 No Login Offline 2008 nightster,flat od green and black Posts: 748 rock hill,S.C. Gender:	Re: Tech Question - Speedometer Reply #2 - 01/17/06 at 07:58:04 i put my drills on the end of the cable and found that the black and decker 1400rpm,got it to 40 mph,and the hitachi 2900 rpm got it to 85mph. hope this helps in some odd way
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tankerblaze

Ex Member

Re: Tech Question - Speedometer
Reply #3 - 01/17/06 at 10:45:50

Torque... you're the man!

If you're numbers are correct we can deduce that:

if
40=60
1400= X

Then
40x = 1400*60
40x = 84000
40x/40 = 84000/40
x=2100

Answer to my original question is:

2100RPM to 60MPH for a stock Savage

to make the Autometer Mechanical Speedo work u need a 21 to 10 gear ratio changer. I'll keep ya'll posted when I get the changes done!

-Tanker out!

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iKrayg Ex Member	Re: Tech Question - Speedometer Reply #4 - 01/19/06 at 20:04:21 Badass! Yeah, please post pictures. Which Autometer model are you looking to installing?
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Steve530 Senior Member 2005 No Login Offline Posts: 452 Knoxville, TN Gender:	Re: Tech Question - Speedometer Reply #5 - 01/19/06 at 20:30:58 And if you use the other data point: 2900/85=x/60 x= 2047 That's about 2% error which is probably closer than the speedo. Steve
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threezukes Ex Member	Re: Tech Question - Speedometer Reply #6 - 01/20/06 at 07:11:33 Is the stock speedo really correct anyways? Overhere they have these little mobile units that they set up on the side of the road that displays your speed as you drive by. They always read a little slower then my stock speedo, but they seem to match my bicycle speedo.
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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: Tech Question - Speedometer Reply #7 - 01/20/06 at 08:43:30 I had heard that the speedo drive is a ratio of 2:1.
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BS37066

Ex Member

Re: Tech Question - Speedometer
Reply #8 - 01/20/06 at 10:02:34

Now that you mention it, I've always found those mobile units always agree with the speedometer in whatever vehicle I'm riding or driving. I was clocked on both my bike and cage the other day and they appeared spot dead on.

I don't think I've ever heard anyone that has argued that they were caught on radar and it was way off the speed they thought they were doing.

Anybody have different experience?

threezukes wrote on 12/31/69 at 16:00:01:

Is the stock speedo really correct anyways? Overhere they have these little mobile units that they set up on the side of the road that displays your speed as you drive by. They always read a little slower then my stock speedo, but they seem to match my bicycle speedo.

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torque Serious Thumper 2005 No Login Offline 2008 nightster,flat od green and black Posts: 748 rock hill,S.C. Gender:	Re: Tech Question - Speedometer Reply #9 - 01/20/06 at 10:33:21 threezukes wrote on 12/31/69 at 16:00:01: Is the stock speedo really correct anyways? . not if if u have a taller tire on ur bike
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tankerblaze Ex Member	Re: Tech Question - Speedometer Reply #10 - 01/28/06 at 21:51:32 Here's my selection from autometer... looks beautiful and will fit...
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Dynobob

Serious Thumper

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2003 LS650 (with
Supertrapp)

Posts: 634
Northern Virginia
Gender: male

Re: Tech Question - Speedometer
Reply #11 - 01/28/06 at 23:30:12

BS37066 wrote on 12/31/69 at 16:00:01:

I don't think I've ever heard anyone that has argued that they were caught on radar and it was way off the speed they thought they were doing.

Anybody have different experience?

All Honda cruiser speedometers are off about 5 mph at 60. That would be 8.33 percent off. I guess it keeps bikers' speeds down Roll Eyes

Autometer guages are really really nice. I used to use them in my car.

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working_class_chop

YaBB Newbies
2005 No Login

Offline

I love YaBB 1G -
SP1!

Posts: 35

Re: Tech Question - Speedometer
Reply #12 - 01/29/06 at 05:52:34

Savage_Greg wrote on 12/31/69 at 16:00:01:

I had heard that the speedo drive is a ratio of 2:1.

I believe the proper ratio is 2.1:1 or at least that is the ratio of all the speedos we sell.
What size speedo is needed for the sock housing??
I did a recessed 2" speedo on our savage, but we altered the tank mount for that, what size is the stock opening?

chop whatcha got
-Steve
http://www.workingclasschoppers.com

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chop whatcha' got
-steve
www.workingclasschoppers.com

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