mikey

HELLO PEEPS This is my plan, pull the full air conditioning wizardry from a pick-a-part car and put it in my 240z. I'll pick a car that has a rooly simple AC system with just a button to turn AC on/off, no climate control. Probably end out using the AC pump which came with my engine. Most likely stick with the existing 240z heater unit, but swap in the blower and AC box in front of it. I'll no doubt have to bend up some new lines and stuff and buy some wacky connectors and crimping tools. Or maybe just get an AC chap to do that bit. Someone tell me why this is a bad idea. Worst thing about it is it will clutter my engine bay, but the car is so damn uncomfortable to drive in summer traffic it'll be worth it!

Ahhh right, cool. Will do.

Oh wow. Interesting. Seems so obvious. Basically wire it up like the stock coil. Cripes!

HAHA Couldn't agree more! I could move to the older circuit. And I was planning on doing that until I thought maybe I could get away with a little mod. The only little thing that bothers me about doing that is it leaves the original circuit in there and just modifies the signal. Which somehow feels dirty, and replacing the whole thing _feels_ better. Which is a fucken stupid reason really. Anyway, I'll do which ever one Ned thinks is best really. He knows a fucktonne more than me about this stuff.

HAHAH I like the thought thou!

Yeah, it's gonna be this scheme: So not much different!

Yeah, it's funny. Some of the stuff they're replacing I would've probably just lived with. But they bend up steel so fast and well that it's best just to fix everything in steel. Suits me

GT Refinishers have been doing some amazing things: They've replaced the whole lower panel of the boot. And done a fucken sweet job too. This panel is a work in progress, but has some tricksey curves.

I've fucked that up haven't I. The load needs to be collector? *Edit* you bet me. OK cool. I think that makes sense but I'll await instructions

Would I do something like the following? With the 8V VDD tied to the voltage reg. Or am I safest to have a current limiting resistor between the transistor and the IC?

The circuit I built all works, surprisingly! I took it to Ned's place of work and he hooked it up to a signal generator and it all went fine. So the question was, why doesn't it work in the car? Turns out the ignition signal to the coils is about 4V1, and the tacho circuit wont work on anything less than 3V9. After the steering diodes the voltage must be dropping below this. The current plan is to build the totally different circuit in the schematic above with the Microcontroller. However couldn't I just use a transistor on the IC input and VDD to step the input voltage up?

I very much enjoy this thing.

Lushness. Factory seats reupholstered by Westgate Auto Upholstery. Dropped the car at GT Refinishers with the help of 10speed today too. EXCITE.

Sweet, I'll get to work on it in the next couple of weeks. Thanks again for help with the debugging.

Yeah, people with think I copied or sommin! Also, red means I can still join the Red Datsun club.

Thanks, I could do with a hand actually. I'm a bit over my head. I'll do these checks tonight and see where we stand. But some help with it would be greatly appreciated. I'm hoping to get it working before the car goes to paint next week. I was planning on doing the same as 10-5 actually, but then I saw they'd changed to this schematic so thought I'd do this. I'll give this a bit more of a go and see how we go. I planning on sticking with the red, but I can't say I'm 100% sure it's the right thing to do. I'm pretty fond of this color: One issue with changing colours is I've already painted the engine bay red. So I'm 95% sure I'm going with this scheme: I don't have a g-nose obviously, but satin grey flares, bumpers & wheels.

Ahhh, good thinking. Will check that.

The output from the voltage Reg looks good, 8V or so from memory. I'll test the IC output tonight and report back.

The scope is showing the output from 3 ignition drivers passed through steering diodes. Which I was then feeding into this circuit http://www.dinoplex.org/tachoconversion/ But for some reason there's no output from the CD14538BE. I'm fairly sure the circuit used to work when hooked up to one ignition signal i.e without the steering diodes It's possible I've fucked it as I've been hacking it quite a bit. I've had a good look over it and can't see anything physically wrong with it, and I've tried a new IC. Maybe I should isolate the output line from the IC and check it when it's not hooked up to the transistor etc, just incase the transistor's blown and it's pulling the output low? Any help greatly appreciated!

Yeah, for reals. I was a widdle bit nervous about that too. haha. It goes in for paint on the 1st of July. In the meantime I'm getting the seats reupholstered and dash recovered and a few other interior bits and pieces sorted. I'm also looking at installing a HVAC from a pick-a-part car including AC, thinking old honda civic or sommin.

It took about 4 hours for 3-4 people, so probably would've taken aaaages to do myself! Plus I would've been bored out of my brains. Used poly strip discs on the angle grinder: The roof was pretty sweet, there was some surface rust under the bog, but all solid after a quick clean up. So all good on the rust front, not so good on the bog front, there was a shit load of the stuff! Just about every panel looks like it's had marbles shot at it

Stripper party!!

I put my new mirrors on: I'm gonna be stripping the paint of this in preparation for a respray, if you live in Auckland, have an angle grinder and have some spare time on the weekend come to my Stripper Party!!

A very minor update to the tacho discussion. I hooked up the ignition signals to some steering diodes and then measured the output with the scope and got this: So that's good, all seems to be working OK. However, after I hooked up my tacho I got no movement. So either the signal can't drive my new needle driving circuit or I've somehow broken it.

Yeah sweet, it's on the back burner a little bit at the moment while I do some easier/more rewarding jobs! But I'll get back into it next week cos the wahine is away. I'm giving myself a deadline of getting it running by next Sunday, so expect some progress! Sorry for the slow reply, my email alert seems to have stopped.