UKrunner

Are they the same?????

Ride4Fun

They are interchangeable, but not the same. I think that the bolt pattern for the clutch assembly is different. I have a 3.0 flywheel and clutch assembly on my 3.4 swap.

UKrunner

Guess I meant the flexplate then. (auto trans)

thefallman

hey did u ever figure out that signal converter for the speed sensor. never heard back from you on it.

UKrunner

I should really get around to building more of those. I havent done a thing since I got ill in December.

thefallman

unless u want to just tell me what you did ill build it.

UKrunner

Do you have the ability to program a pic?

thefallman

depends on what you mean by ability if you mean do i have the proper stuff to do it? no, i don't but i can get it. if you mean do i know how? Nope i don't know off the top of my head but i've been having fun with electronics lately and learning a lot its kinda fun.

UKrunner

The pic I used needs to be programmed once soldered onto the pcb. Its surface mount and you'd need the in circuit programmer. I could provide code - once I've found it. I didnt really document this that well and on top of that, the pcb layout, code and BOM is on a hard drive that crashed.

The concept was an ac-dc or analogue to digital converter on the input and a digital output at 2x the input frequency iirc.
The analogue waveform gets rectified to provide a digital positive and negative pulse at exactly 180 deg phase of each other. The negative going pulse is inverted to a positive and combined with the positive going pulse. Because the analogue waveform gets clipped, there is time between the 2 positive going pulses. The pic counts these and multiplies by 2 over a given sampling time of one revolution, and outputs 4 pulses at an equal space. This means the speed on the speedometer is exactly one revolution of the output shaft behind the actual speed.

You can do this without a pic but I can control the multiplier in software to compensate for different size tires, thus always having the right speed displayed.

thefallman

got ya im pretty sure my novice skills are up to trying to make it work. if i had at least some tech support. One of my current projects is in fact a pcb. so i got that part covered. a parts list would be helpful but i can probably figure it out maybe

thefallman

would this work http://focus.ti.com/lit/ds/symlink/vfc320.pdf

UKrunner

Hmm. It might. The amplitude of the analogue pulses never change and this device changes the digital pulse width based on the analogue amplitude. It might work ok if it triggers per pos and neg peak on the analogue signal. One way to try is build it up and just put a scope on the output and on the speed sensor and see it the output corresponds to the input. If it does, then there is still computation to be done on the digital pulses.

Got any 555 timers? You could do it with 1 or 2 of them.

UKrunner

You could even do this with a dual channel comparator such as LM2903. Use a couple of transistors to convert the negative pulse into a positive and bang it through the comparator and add the output to the output of the positive pulse comparator channel via diode and then you have 2 positive digital pulses per revolution. Still need to multiply it by 2.