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wow. the 74tii is finally retuned!!!

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After the pertronix died and the weak spark issues

see the sad

http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,281233/

I FINALLY got the right little disk that spins around in the distributor setup for the crane 700. Use the smaller one they send I guess is the lesson there. The biger one reads the optic better and doesn't get in the way of the rotor, but doesn't seat as well at all. THe smaller one is a pain cos you have to move the optic in so it nearly is rubbing against the rotor.. but thats the one to use. It seats way better and well.. it works!

But holy cow.

After adjusting the valves (as per FAQ http://www.bmw2002faq.com/content/view/21/32/) and going through the KF setup following the manual (and being REALLY anal about getting it right -- see http://www.thetiiregister.com/)

AND using the old red coil

AND putting new spark plugs in..

AND suffering through some grounding issues

AND getting the timing set

HOLY CRAP!!!! The ol 74tii is running better than it has for a long time. I used to think it was running pretty good (and it was pretty good), but now.. oh man. The power band has smoothed out accross a much larger range of RPM and it just purrrrrss. Idling smooth at about 850 RPM .. the damn warm up transmitter is setting up to spec when warm.. its all good!!!

WOOT! The old girl is back and waaay better than ever.

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I tried a Crane installation the other week on my car (74tii) but couldn't get it to go. The brain was intermittent and the spare I had was an old one that came with my car. I've since replaced the brain with a new unit and am ready to try again. A question though- I've got a black wire running to the condensor that meets another wire that runs to the -ve of the coil. When I tried my installation earlier I completely disconnected these two wires and they no longer were connected to anything but I think that was an error. I believe they still need to be connected together so the black lead still goes to the coil. What did you do with these two wires?

BTW are you setting traps for your furry pests? ;)

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I tried a Crane installation the other week on my car (74tii) but couldn't get it to go. The brain was intermittent and the spare I had was an old one that came with my car. I've since replaced the brain with a new unit and am ready to try again. A question though- I've got a black wire running to the condensor that meets another wire that runs to the -ve of the coil. When I tried my installation earlier I completely disconnected these two wires and they no longer were connected to anything but I think that was an error. I believe they still need to be connected together so the black lead still goes to the coil. What did you do with these two wires?

BTW are you setting traps for your furry pests? ;)

hmm. I too have an extra wire thats just laying around. I don't really know what the wiring is supposed to look like on a stock 74tii cos the PO had put in a pertronix and had a balast resister in when he didn't need it. I do know if you don't get the ground right on that 700 box it will fail -- but not all at once. Mine was acting strange. Car would start and run for a while and then just die. Once I moved the ground to a better spot it quit doing that.

Now one of those wires might be the tach wire -- ?? I don't know. Likesay the wiring on my tii is its own beast unfortunetly. If you looked at it I bet its nothing like yours.

I'm still not quite done tuning. The other day I drove some fast roads and I've lost some of the upper end zip. Its like the power band has moved down from where it used to be. I'll have to do the hill trick .. advance till big pings.. and back off. Haven't had time.

Beavers: this girl is too friendly to have them trapped or shot (I offered to loan her my SKS) -- but the little bastards are digging under the fence. They went and got another apple tree the other day so I think she's considering blasting a few of them. We're going to try mixing 1/3 fine sand with latex paint and painting the trunks. I guess thats supposed to make the trees taste like crap and the latex is OK for the trees.

Me i'd just camp out and ace a few of them .. make some beaver hats out of em. Send a message

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I am pretty sure that that wire goes back to the tach and also provides a ground for the coil. I'm hoping to give the install a try today but so far I haven't started it so I may have to wait until next weekend. I also may try calling or contacting Keith Kreeger of my2002tii.com. He built a 74 from the frame up with a Crane unit in it. Anyway if you find out where those wires are connected in your car that may help me. And also good luck with the beavers! I am from Canada and they are pretty tenacious, the other creature I remember as being a complete pest is the porcupine. Watch out for those suckers!

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I just installed a XR700 today on my '74 tii.

The motor sat for almost a year out of the car. It fired up in three cranks!

Anyway, there were no extra wires left.

red to + side of the coil, yellow to - side of coil, and the black gets grounded against the chassis. As long as the original condensor wire (which is also black) connects to the - side of the coil you will get a tach signal.

I followed the FAQ here for the rest of the install. No issues.

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