Tachometer Adapter board
Moderators: JeffC, rdoherty, stieg, brentp
Tachometer Adapter board
Here's something that neatly solves a nagging problem for nearly all Megajolt installations: interfacing existing Tachometers to multiple coil packs.
http://www.autosportlabs.org/blog/?p=1618
Available now in our online store: http://www.autosportlabs.com/tach-adapter-p-65.html
http://www.autosportlabs.org/blog/?p=1618
Available now in our online store: http://www.autosportlabs.com/tach-adapter-p-65.html
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- tachAdapter_small.jpg (46.86 KiB) Viewed 22133 times
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- Posts: 100
- Joined: Mon Mar 30, 2009 4:49 pm
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- Posts: 21
- Joined: Fri Mar 02, 2007 7:34 am
- Location: Sheffield UK
Ian,
The solder won't melt at the temperatures used to shrink heat shrink tubing.
Not a lot of current flows through here - small gauge wire is fine and makes it more convenient.
A similar circuit works for my AW11 tach, so it should work for the AE86 tach as well.
Note, this board is not a cure-all for *all* tachometers out there. it has the addition of 100K resistors across each diode which helps make certain tachometers compatible - such as the 914 tach we're using in our race car: that tachometer wouldn't work with just diodes.
The solder won't melt at the temperatures used to shrink heat shrink tubing.
Not a lot of current flows through here - small gauge wire is fine and makes it more convenient.
A similar circuit works for my AW11 tach, so it should work for the AE86 tach as well.
Note, this board is not a cure-all for *all* tachometers out there. it has the addition of 100K resistors across each diode which helps make certain tachometers compatible - such as the 914 tach we're using in our race car: that tachometer wouldn't work with just diodes.
Tachometer Adapter board
If your tacho works, but has a hissy fit bouncing around at higher rpms.
Would this adapter help ?
Would this adapter help ?
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- Posts: 21
- Joined: Fri Mar 02, 2007 7:34 am
- Location: Sheffield UK
Hi Brent
Feel a bit guilty 'cos it's not fitted to my megajolt. I am about 2 weeks away from start up on my Zetec Caterham 7 conversion and have fitted a DTA ecu as i want to go injection in the near future. The DTA has simillar issues driving Tacho's so i will let you know how i get on. I used raychem solder splices to join the wires near the ecu by baring a short section of the driver wire and then bonding a 18awg wire from here to the board. It's then all heat-shrinked into the loom.
Feel a bit guilty 'cos it's not fitted to my megajolt. I am about 2 weeks away from start up on my Zetec Caterham 7 conversion and have fitted a DTA ecu as i want to go injection in the near future. The DTA has simillar issues driving Tacho's so i will let you know how i get on. I used raychem solder splices to join the wires near the ecu by baring a short section of the driver wire and then bonding a 18awg wire from here to the board. It's then all heat-shrinked into the loom.
In the lab or in the car
Tach adapters back in stock!
The first batch flew out the door- we now have plenty of the tach adapters in stock: http://www.autosportlabs.com/tach-adapter-p-65.html
Thank to those who've been patiently waiting!
Thank to those who've been patiently waiting!
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- tach_adapters_confetti.jpg (86.47 KiB) Viewed 22023 times
incorrect tach reading
My tach is not giving the correct readings at times. It's reading too low. Is this supposed to be a better option and replace the home made "diode circuit"?
Car is a BMW 2002 4cylinder M10 engine. Thank you
Car is a BMW 2002 4cylinder M10 engine. Thank you