82 FB with renesis engine

[Sib West]

Hello to all.
i have followed the forum for a while but unfortunately my computer skills are so poor it has put me off from joining in.

I could do with some help and advice with a few jobs on a 82 FB s2 with a renesis engine fitted.

I would like to use the original tacho but with the loss of the coils and with the new engine management fitted it doesn't read correctly.
Apparently the ecu has rpm output but the fb tacho has a high voltage spike tacho.
Does anybody have a instrument cluster to sell? I can try fitting the back of a electronic tacho to the original tacho?

I would like to fit a 24 Spline Torsen lsd. Does anybody knows of one?
Thanks
Dave

[gt_james]

can't you tap into the negative of a coil to work the tacho rather than using an ecu output?

Don't think theres such thing as a 24 spline torsen, your only option is an 81-83 GSL clutch type diff.

[Sib West]

From what i understand!
it doesn't create a high enough spike for the FB tacho and the renesis has four coils as opposed to two so the rpm would be half.
I'm thinking i will have to fit the guts of a modern tacho onto the face of the FB tacho!
Thanks for the reply

[gt_james]

I'm sure there's an easier way to feed the existing tach, basically your rx8 ecu outputs say a 5v square wave tach signal, or 12V or something, there will probably be a converter to replicate the output from the negative of a coil.

[gt_james]

https://www.holley.com/products/accesso ... parts/8913 something like this may help

[gt_james]

or maybe greddy rpm adapter

[spirit r]

Hello to all.
i have followed the forum for a while but unfortunately my computer skills are so poor it has put me off from joining in.

I could do with some help and advice with a few jobs on a 82 FB s2 with a renesis engine fitted.

I would like to use the original tacho but with the loss of the coils and with the new engine management fitted it doesn't read correctly.
Apparently the ecu has rpm output but the fb tacho has a high voltage spike tacho.
Does anybody have a instrument cluster to sell? I can try fitting the back of a electronic tacho to the original tacho?

I would like to fit a 24 spline Torsen lsd. Does anybody knows of one?
Thanks
Dave

Try this http://www.abbott-tach.com/cablex.htm and search Mx 5 24 spline torsen 1. The torsen 2 with 26 spline working good and quiet in my car.

viewtopic.php?f=4&t=1118&start=150

http://www.ausrotary.com/viewtopic.php? ... 8#p2825227