Hi Guys, recently discovered my speedo is reading upto 9 mph slower when travelling at 70 mph, is there a fix for this without braking the bank. Have looked at fitting a GPS speedo but have sat nav and camera already on handle bars so I am running out of space. Any ideas please.
That's unusual, they normally over read by 8% ish on average. It's not got a speedo healer fitted has it?
Has it got a larger gearbox sprocket perhaps? Or a smaller rear sprocket?
Good call fishyfinger man.
Sprockets are 18-43 from memory.
To get it bang on Andy, only way is to fit a SpeedoHealer
https://www.healtech-electronics.com/products/sh/
Quote from: Hooli on Wednesday, 20 June 2018, 12:25 AM
Good call fishyfinger man.
Sprockets are 18-43 from memory.
18 - 41 I think you'll recall Hooli
The Sat Nav would display the correct speed for you though wouldn't it? Is this where you're getting the '9mph slower' reading from on the speedo display? If so, then I'd be checking the above, sprocket tooth count & follow the speedo pickup wire to the plug, check to see it hasn't got something else plugged into it (speedo corrector of one sort or another) as well. There are a couple of different brands of these & each has different ways to program it to function correctly.
Have a check & let us know the outcome & we'll see where to go from there.
Checked both sprockets and drive chain, as that was my first thought but all correct. Checked the pickup and rota on the gearbox all seem OK. Also checked the wiring again no visible fault showing up.
Good job, well, a speedo corrector will fix it, Dave has posted a link in a previous post. I use a different brand than Healtech, can recall it at the mo, USA thing. works great & is easy to adjust / program.
Found the one I use, 12 O'Clock labs
http://shop.12oclocklabs.com/index.php?route=product/product&product_id=59
Ours reads about the same I know it so a just my speed to compensate.
70mph I do 80mph on.my Speedo
60 I do 68
50 I do 56
40 I do 44
30 I do 30
Works ok
Quote from: KiwiCol on Wednesday, 20 June 2018, 03:03 AM
Quote from: Hooli on Wednesday, 20 June 2018, 12:25 AM
Good call fishyfinger man.
Sprockets are 18-43 from memory.
18 - 41 I think you'll recall Hooli
You may be right, it's a couple of years since I changed them.
When I had the Healtech fitted to my 14, I needed to set the adjustment to 87.5% - this being the accuracy of the OEM speedo - to get the correct reading as my speed - compared to my Sat Nav - was very similar to Seth's (above).
Suzuki speedo's are known to be "about 10%" out. Just the way it is.
Quote from: seth on Wednesday, 20 June 2018, 05:30 AM
Ours reads about the same I know it so a just my speed to compensate.
70mph I do 80mph on.my Speedo
60 I do 68
50 I do 56
40 I do 44
30 I do 30
Works ok
14's speedo is not linear - it's quite accurate up to 50km/h and then difference get bigger and bigger.
@Thommohawk post table in the past (possible at old forum). In this situation, SpeedoHealer cant make it right for all speeds...
But odometer is linear and quite precise, so I ajust my (have -1 front sprocket and 55 height rear tire) SpeedoHealer to show correct distance, and do not care about speed to much :)
My speeds weren't set using a Speedo healer.
I just sat at the speeds I said and noted the actual speed using a GPS.
I first noticed my Speedo being so far out when in a 40mph average speed camera zone for road works I was sitting at 42ish and a bus was getting very upset as he wanted to go faster my real speed was nearer 34mph .
So I did the test using my GPS at all the common speed limits and now sit at the speeds I said .
As then I'm always within10% of the speed limit usually below especially in a 30 as there isn't really any need to go fast in town .
:cheers:
@seth , I just use your numbers, to confirm changes are not liner :cheers:
All good buddy
:onya:
For what it's worth, using my 12o'Clock labs speed corrector, my speedo & GPS are reading the same (+/- 1kph) right up to 120ish, & I'm not looking too much at the speedo if I'm still 'climbing' after that . . .
Do you have a link for where to get one
@KiwiCol :onya:
Thanks guys, all this has been very helpful will be looking into a calibrator. Thanks again.
Quote from: seth on Wednesday, 20 June 2018, 06:01 PM
Do you have a link for where to get one @KiwiCol
:onya:
Yeah mate, posted it up earlier in this thread.
http://shop.12oclocklabs.com/index.php?route=product/product&product_id=59
I was looking at some of their other gear today, they've got some 'flash' indicators !!
Sorry
@KiwiCol I never noticed thanks .
I must pay more attention :doh:
No prob mate, all good.
just a question, will fit one tooth bigger front sprocket next change. should make speed reading nearly correct? odometer will then need healer? will be slow, am i correct?
I dunno the answer to that Grog, only way would be to record / measure distance covered on a trip using GPS (on phone if you've not got one mounted) & comparing the Odo reading, obviously, the longer the distance the better the accuracy.
Speedo healers affect the odo too, as they modify the signal before it reaches the clocks. I seem to recall Tallman looking at adjusting the speedos directly & thought it was a near impossible task as it involved reprogramming a load of chips.
Glad i read this as i didn't know about the speedo inaccuracy problem ??? but it would explain why 80mph feels very fast :whistling:
Quote from: grog on Wednesday, 20 June 2018, 07:01 PM
just a question, will fit one tooth bigger front sprocket next change. should make speed reading nearly correct? odometer will then need healer? will be slow, am i correct?
In theory 1 extra tooth on the front sprocket will add 4 mph at 4000 rpm so up from 85 to 90 mph.
Could you work the difference out off the rev counter i think from memory at 4250 rpm mine shows 100 mph ish i.v got 18/41 but the rear wheel is 240/40/18
It feels accurate i know cameras in road works trigger at 60/67 mph 50/57 mph and 40/46 mph and 30/34mph oh yeah by the way on all smart motorways ie hard shoulder running all gantry cameras are set at 85mph now 24/7 unless the over head speed is lower then the above apply
Are you sure you have an 18" wheel?
A 240/40/17 is just about the same diameter as a 190/50/17 so the difference in speed will be very small.
Aye 240/40/18 mate
Do you know half your swingarm has fallen off?
Thought summit was missing :doh: just been out on it and 4000rpm on mine is 85mph so is this running fast or slow or is it about right
3,600rpm shows as 70mph on mine & I never* speed....
Aye thats about the same as mine
9k at 100... Oh hang on, that's in 2nd :devil:
Quote from: Latty66 on Thursday, 21 June 2018, 08:29 PM
Thought summit was missing :doh: just been out on it and 4000rpm on mine is 85mph so is this running fast or slow or is it about right
Assuming you are on standard sprockets you are reading a little low, should be 88mph with your tyre (in theory).
Cheers mjgt
Thats close enough for me mate thanks everything around the legal limits should be near enough :cheers: