Help with understanding alignment of 4x cam and 58x crank reluctor wheels and sensor

[copo-rat]

I fabbed up the 4x wheel myself and bought the 6" elecromotive wheel off eBay. I dont have the exact details on the crank/cam orientation - but I have a good idea... I'll know more info this weekend and i'll be happy to share. Diameter of the wheel(s) doesnt matter... 6" or 6'...

Okay, without sounding too stupid, I have to ask.......if the cam is turning half the speed of the crank, don't you have to keep the same relationship between crank reluctor and cam reluctor? I understand that the diameter of the crank wheel doesn't matter, but doesn't the cam wheel have to be a certain size determined by the crank wheel? Wouldn't it have to be twice the size of the crank wheel unless you were using something that was gear driven like the EFIConnection wheel that is retrofitted into the distributor? Probably a real simple answer that I'm overlooking and as soon as someone says it then it'll hit me, but I had to ask. I'm afraid to start buying parts not knowing if this set-up will work, but with two other people on this forum alone having the same idea, that gives me hope. I have ZERO tuning experience, but figured if I could figure out all the packaging (at least if it's possible) and get it together, then I'd find someone to tune it for me!

[joecar]

The cam/crank sprockets have to maintain the 2:1 relationship.

The reluctor wheels can be any diameter since they are fixed relative to their respective shaft (cam or crank)...

i.e. a sensor will see the same reluctor pulses regardless of reluctor diameter.

[copo-rat]

Makes sense, I just needed someone to say it so I could hear it and process it. Thanks for clearing that up for me joecar.

[tunedportcj5]

Whelp, I have a crank signal. Its reading ~250rpm during cranking. Making some progress... However I have no spark or injector pulse. I ran out of time this evening to continue troubleshooting. I need to double check my cam sensor wiring. I havent done much with the tune - i've only applied the VATS patch and changed a few other tables.

Are there any PIDs that monitor the cam sensor? Any other suggestions for testing the sensor...etc? I may have some wires crossed - i'll verify tomorrow.

I am not concerned about timing at this point, I am just looking for some spark and injector pulses

Thanks!
David

[doubledip]

There is Cam Hi to Lo and Cam Lo to Hi counts

[nevinsb]

Hope you get this thing going! There's a lot of good information here.

[Highlander]

[email protected] could help you out on that.

[schwoch1]

[email protected] could help you out on that.

Well, I hate to talk bad about Mike, but he did not know what the relationship was when I last asked him......
After a small amount of digging, it looks is if the missing notch is 14 teeth away from he crank sensor, now if I could figure out the cam that would help out 1000%!!!

Mike

[Highlander]

Well... did you buy a kit from him? I am sure I remember he told me some of the specs when we were building my ls1/lt1 kit... but then again, I bought almost $4k in stuff from him. And I still do.

He does the 58x conversion to lt1s and sbc, so I am sure he figured it out.. but... it's something that took him a LOT of $ for him to give out free.... He is extremely knowledgeable and he builds harnesses that maybe gm has that level of quality.

[ScarabEpic22]

I havent seen EFIConnection do anything with the LL8s, not sure how much Mike has played with them (if at all).