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post #1 of 12 (permalink) Old 03-28-2012, 05:20 PM Thread Starter
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Speedo Healer help

searched and searched and not had much luck with this

Bought a Jim Alhman speedo healer from rc51parts and having some trouble finding info on it.

Been to rc51.org for the instructions but they show the instructions to have 2 sets of 7 switches ? this only had 1set and it has 9 switches



Any help would be great on the switch settings. I dropped a tooth in the front and went 2 up in the back so 15/42
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post #2 of 12 (permalink) Old 03-28-2012, 06:33 PM
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I had the same problem. I'm at 15-41 and put in a 15% correction.

1st generation Speedohealer
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post #3 of 12 (permalink) Old 03-28-2012, 07:30 PM
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I am 15/43 (SP1) and my correction is 20.2 percent. So it's not hard to figure that 15/41 could/would be 15% and 15/42 somewhere about 17.5%.

With that correction, my speedometer is absolutely dead-nuts-on with every "road radar sign" I've ever come across, and perfectly matches my Z-06 at 70 mph.

However, my odometer is exactly 10% "slow", meaning that for every mile I ride, the odo records .9 mile. I have verified this against highway mile-markers many, many times....which is why my fuel light comes on at about 125-130 miles instead of about 145-150 or so!

These numbers are using the modern "HealTech" SpeedHealer. I do have the earlier Alhman's version on my VFR, and it works dead-on, too. That unit is set at 12.5% for 3 up for the rear sprocket, OEM fromt.

White91--when you get your speedo dialed and (and tested against a modern car because they're usually dead-on) how about posting back your correction for others to see/use.

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post #4 of 12 (permalink) Old 03-29-2012, 12:13 AM Thread Starter
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how are you guys doing your math ?

i have 15/42 and i am getting 12% with math
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post #5 of 12 (permalink) Old 03-29-2012, 04:32 AM
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Quote:
Originally Posted by white91formula View Post
how are you guys doing your math ?

i have 15/42 and i am getting 12% with math

Ahhh....you may be on to something! It's been 5 years since I calibrated my 'Healer on my RC, and on the electonics box I wrote "20.2" on a piece of tape with a Sharpie. But---now that you mention it--- I think that is the "correction factor", which is not same as the percentage of error, as I recall. Dang!

Recalling even less, I'm pretty sure the Alhman in my VFR goes by percent, and as I mentioned that is 12.5%. And further, I recall having email comversations with the HealTech folks in England about all their obtuse mathmatics, so until I can dig out the HealTech instructions and their comments, please ignore everything I said above, except the Alhman unit and my VFR numbers.

HealTech Speedohealer Dipswitch Numbers do not equal Alhman Dipswitch Numbers! I apologize for being a dumbass!

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post #6 of 12 (permalink) Old 03-29-2012, 12:22 PM Thread Starter
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This is my equation I am using.

(new rear/new front) / (old rear/old front) - 1 x 100%

(42/15) / (40/16) - 1 x100%

2.8/2.5 - 1 x100%

1.12 - 1 x 100% = 12%


for 15/43 it should be

43/15 / 40/16 -1 x100%

2.866 / 2.5 -1 x100% = 14.66%


for 15/41 it should be

41/15 / 40/16 - 1 x 100%

2.733 / 2.5 -1 x 100% = 9.33%
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post #7 of 12 (permalink) Old 03-29-2012, 12:58 PM
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There is a calculator on the speedohealer website that calculates the percentage error for you. I just installed a 195/55 rear tire and 15/41 (down from 15/43). It takes into account rear tire height and it calculated the error at 10.8%.

Eric
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post #8 of 12 (permalink) Old 03-29-2012, 02:52 PM
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Exclamation This is humor

I RUN 15-42 as well

So without a speedhealer instead of guessing how far over I am indicated WHENEVER I see A LEO I Drop two gears pin it until It hits the rev limiter in 6 th.

try it it's fun


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"03 RC"
and a new litter
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post #9 of 12 (permalink) Old 03-29-2012, 08:18 PM
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Quote:
Originally Posted by white91formula View Post
how are you guys doing your math ?

i have 15/42 and i am getting 12% with math
Used the math, went out and rode next to a stock bike with an accurate spedometer and was still off. Keep upping it until it was matching.

I guess the math didn't translate for the old computer lol
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post #10 of 12 (permalink) Old 03-30-2012, 12:18 AM
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Quote:
Originally Posted by BlueLunatic View Post
Used the math, went out and rode next to a stock bike with an accurate spedometer and was still off. Keep upping it until it was matching.
Stock Japanese bikes do not have accurate speedometers. They're all 5-7 percent fast, meaning when the speedo says 100, you're going slower, like 93-95 or so.

However, modern cars have very accurate speedometers, regardless of make. My not-so-modern 2003 Vette exactly matches every road radar I've ever been thru, and with the heads-up display I never have to glance down at the speedo to confirm. Always identical. So....use a car, not a bike.

Work out a signal with the car driver, like when they're holding a nice steady 70, hold their fist up. Keep is simple so they don't wander around 70 trying to tell you what the speed is via arm motions and exaggerating mouthing of unhearable words. Tell them you only care about 70, and show you a fist. Nuttin' else. And DON'T enlist your galpal or wife. A squabble will surely ensue. YOU: "What is it about a steady fukkn 70 you don't understand?!!!" HER: "Shove that speedohealer up your asssssss!!"

Why 70? It's close enough to the lower speeds when an LEO might be running radar (neighborhoods) and halfway to 140, which is fast enough not to be looking at a speedo anyway! Point is, 70 negates error in either direction, and is a typical highway speed to worry about radar problems.

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post #11 of 12 (permalink) Old 10-09-2016, 04:42 AM
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I know old post but I too need a Version 2 instructions. Found the gen 3 and the one with 2 sets of 7 switches. hope someone still has a copy
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post #12 of 12 (permalink) Old 10-20-2016, 08:33 PM
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Do you have a Speedohealer or an old Jim Ahlman unit?

Here's a link if you have the Ahlman's.

Jim Ahlman instructions


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