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  #1 (permalink)  
Old 12-20-2012, 01:16 PM
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what speed sensor to buy???

i am told i have a custom chrome 5 in a 4 transmission with kicker....i need to buy a speed sensor to get my speedo working correctly and was pointed to the thunder-heart programmable one....the guy that told me what trans i have told me it wouldnt work because of the 5 in a 4???? so im just checking with you guys first, any opinions??? thanks in advance
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Old 12-20-2012, 06:40 PM
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Rear wheel speed sensor...2 kinds. 1 that counts the mounting bolts on the sprocket and 1 that counts the teeth. Depending on how much space you have between sprocket and axle plate will determine which one to use. the one that counts teeth you have to fab own bracket.

Senders/Speed Adaptors
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Last edited by foggdog; 12-20-2012 at 06:45 PM..
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Old 12-20-2012, 07:08 PM
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The sensor has to match what the black box is expecting.
The sensor [you need to find] has to match a resistance to what the box is expecting.
The shop manual may have a sensor value it has to be within or within a spec number.
The sensor you need is that spec number needs to fall within that range.
The sensor can be an old harley type, a jap type, euro type is all about balance of parts.

That is one problem.

The gearbox needs some sort of trigger.
The sensor has to produce a hall effect.
The hall effect is a frequency wave or hertz signal
The signal is what the box is looking for.

The second problem is how to change a part so there is a trigger in the gear? A trigger off the sprocket shaft nut? I have no clue where this part is? If it is in the gearbox, then you need that trans part. If there is no top cover for the sensor, you need the top cover so to bolt the sensor's nose to and that has a required gap or it hits coming around like.

We got the picture you can use and can't use all at the same breath?
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Old 12-21-2012, 04:51 AM
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hey there, thanks for the couple of replies, i guess i should have put some more info in the thread.....it already has a sensor in the top of the trans, prob like a stock harley sensor.....that is wired up to the speedo, and it works, its just that i have a smw mobster kit bike and the speedo is off quite a bit. its an older drag specialties that is not programmable....so i want to replace the sensor with a thunderheart programmable one, but someone told me it wouldnt work because of something to do with the 5 in a 4 gear box???? i think it will, the stock sensor is working now??? but i was just asking for some opinions on the 5 in 4 style trans....thanks
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Old 12-21-2012, 06:15 PM
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Yeah, you mean the spin ratio is going to calc a different number? Yep, that new frequency is going to be somewhat faster in frequency times clock speed. So basically, the needle will match the wave's input = Output.

Said another way; The needle's position may swing higher? May swing lower?
Said another way; The needle's position may swing lower? If you found the right resistor and it dragged the needle to this frequency.

That might be your loophole? 20 trips to Tandy?
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Old 12-22-2012, 06:25 AM
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Quote:
Originally Posted by m2g4b View Post
hey there, thanks for the couple of replies, i guess i should have put some more info in the thread.....it already has a sensor in the top of the trans, prob like a stock harley sensor.....that is wired up to the speedo, and it works, its just that i have a smw mobster kit bike and the speedo is off quite a bit. its an older drag specialties that is not programmable....so i want to replace the sensor with a thunderheart programmable one, but someone told me it wouldnt work because of something to do with the 5 in a 4 gear box???? i think it will, the stock sensor is working now??? but i was just asking for some opinions on the 5 in 4 style trans....thanks
If you have the stock harley speed sensor in the gearbox already, then the thunderheart unit will fit. They make their sensor to be a billet replacement for the plastic harley one. You can call thunderheart tech support to get the physical dimensions is you are still concerned. When you install it, rotate the rear wheel with the bike in neutral to make sure the sensor is not seated too far down as it will collide with the gear. A small shim underneath it will take care of this.
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Old 12-22-2012, 06:58 AM
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Quote:
Originally Posted by midnight View Post
... not seated too far down as it will collide with the gear. A small shim underneath it will take care of this.
That's but one reason to have an empty beer can in the shop.

The others, well...


...but you and cntrhub are both right. Just may have to bias the circuit a bit too.

Last edited by Fat Bob; 12-22-2012 at 07:03 AM..
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Old 12-22-2012, 07:31 AM
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You do not just throw it anyplace. There is a required gap, not a basic clearance. It's like a radio wave you touch the dial. So I'm going to say, if they have this blue book setting, the X to Y is going to be too weak or stronger nearer the coiled wire frequency? So again, you are so stuck to the parts placement's values and that balance, or go rack your brain it does not dial the needle; all preset at those gaps to obtain those values. Piss is me off these computer bikes are locked down by laws of physics and that little atom's move on the radio dial you lose the signal universe!!
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Old 12-22-2012, 02:32 PM
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As both Fat Bob and cntrhub pointed out, you may need to play a little with the height of the sensor to get it reading properly. Fortunately, the operating height range is large. Here's a picture of my thunderheart with dimensions. (0.8" long with 0.6" diameter).



Here's a picture of the sensor mounted with a washer spacing it upward by 0.08" which was needed to avoid gear collision. This height also worked for reliable sensor pickup. Your situation will vary but using washers will be a quick way to get set. Spin the wheel to check your speed sensing.

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Old 08-30-2019, 11:19 PM
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what is your speed sensor counting where you have it installed looks like its mounted to the transmission?
looking for a mounting spot for mine on my cfl
cheers

figured it out sorry

Last edited by Nelster; 08-31-2019 at 01:13 AM..
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