RegisterSearchFAQMemberlistUsergroupsLog in
Reply to topic Page 1 of 1
TIM + Racetech Rev counter issue
Author Message
Reply with quote
Post TIM + Racetech Rev counter issue 
Hi all,

My MJ v3.3.2 is working well on the sprint/hillclimb mini.

I bought a Racetech rev counter to replace my TIM cheapy rev counter (running with the zener diode circuit from the install guide) that was bouncing quite a bit.

I've never been able to get the Racetech working with either the direct tacho out from MJ pin 8, or the zener diode circuit, or an NPN Transistor/resistor circuit that someone suggested on a Licost forum..

Can anyone recommend a fix to get the Racetech working or (if all else fails) a rev counter that works directly from the MJ pin 8 tach output?

Many thanks

View user's profile Send private message
Reply with quote
Post  
Hi Benny,

Did you ever get this working? Most modern aftermarket tachometers *should* work with the Megajolt system.

Or, if you want something classic, you can use a old-school Porsche 914 tach. It'll work with the diode circuit with bleed resistors across. (See our TachX module)


_________________
Brent Picasso
Founder, Autosport Labs
Facebook | Twitter
View user's profile Send private message Send e-mail
Reply with quote
Post  
Can you please specify clearly that what you want to achieve? I mean what circuit you are looking for and for which purpose?
If you already have a circuit then please post a schematic of it also.
Also specify all the components you are using in your circuit?



Last edited by EnosBlinn on Fri Oct 30, 2015 8:40 pm; edited 1 time in total

_________________
assembling pcb
View user's profile Send private message
Reply with quote
Post  
Hi - thanks for the replies.

Ultimately, all I want is a tacho that works (pref with little extra circuitry that might go wrong in future) when I go through scrutineering noise checks!

Because neither rev counters now work :-/ what is the best way to ensure I am getting a good tacho output from the MJ?

(I appreciate an obvious answer is 'a rev counter', but there seem to be so many differing additional circuit solutions for getting differing rev counters to work with MJ)!

My shift light works as it should - that is a different output to the tacho, but I suppose that indicates the MJ unit is getting a good signal to it...


Thanks

View user's profile Send private message
Reply with quote
Post  
If you can't get the tach output working on the Megajolt, you can also tap into the coil pack signal using a diode circuit.

http://autosportlabs.net/MJLJ_V4_vehicle_installation_guide#Interfacing_to_Tachometers

You can also use the EDIS-4's IDM signal as an alternative source.

So, about 3 options you can employ in total.

Let us know how it works!


_________________
Brent Picasso
Founder, Autosport Labs
Facebook | Twitter
View user's profile Send private message Send e-mail
Display posts from previous:
Reply to topic Page 1 of 1
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum