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Thread: Big Stuff 3 Questions
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08-21-2005 #1Registered User
- Join Date
- Jan 2005
- Location
- Utah
- Posts
- 20
Big Stuff 3 Questions
I just bought a BS3 Gen3 and am a little confused about setting it up for sequential. The manual is vague and when I called Precision Turbo I didn't get my questions answered either. What distributor do I need and how do I set it up? The only dual sync distributor I can find is an Accel 77100T. I think it will work but I am not sure about the reference angle and which connectors to wire it up with. Do I set it up at 50* BTDC? The crank sensor and cam sensor obviously must be used but what about the HEI connector and the white "points" lead? I have read and reread the manual and it is just not clear to me. I don't want to buy a crank trigger if I don't have to.
I am installing it on a SBC 383 with a GT42R turbo. Any help would be greatly appreciated.
Thanks,
Tim
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08-22-2005 #2Registered User
- Join Date
- Aug 2004
- Location
- Jackson, Michigan
- Posts
- 36
you can use a msd 2345. It provides the cam and crank sync. The problem is the reluctor tabs and the rotor need to be out of phase. In other words from msd they are set to trigger at the same time. But the computer needs atleast 10 degrees to make its calculations. So basically what you do is roll your engine to 50 degrees btdc and center one of the reluctor tabs with the pick up. Now this is where it gets difficult, now you roll the motor to 30 derees or whatever the timing that your motor makes max torque and line the rotor up with the number one terminal on the cap. So you need a adjustable rotor and the 2345 doesnt have it and there cap adapt kit with the adjustable rotor wont work on that unit without modification. I sent mine in and had them adapt it. Or you can drive out the pin in the reluctor wheel and move it then tack it where it needs to be. The easiest way to do it would be to run a msd billet locked out distributor and break of all the reluctor tabs but one and use it for the cam sync. Then run a crank trigger for the the crank signal, This makes it pretty straight forward as your dealing with 2 seperate components and it requires no modifications. A accel distributor will not work with a bs3 as its setup for a 6 degree reference angle. Atleast if your wanting to use it as intended with the sync lights and such.
For wiring you only use the hei wires if you are using a factory style ignition , basically plug and play. example a small cap gm computer controlled hei distributor.. For a inductive pick up distributor you use only the points wire and you will connect it to the white wire on a ignition box like a 6al or 7al. The cam and and crank sync wires from the distributor or crank trigger if used will connect to the bs3 . So basically what happens is the bs3 reads the inputs from the the syncs then it will tell the ignition box to fire the coil thru the points wire after it makes its calculations.
I hear ya on the bs3 manual. I think john assumes that everbody knows this stuff. He wrote a whole paragraph on how to load the cd in you cdrom drive but but gives you no info on whats required to setup a ignition system to work with his ecu.
Man I hope you can understand this because Im typing this as im falling asleep..lol. So excuse me if I have mispelled alot of words and im not perfectly clear.
steve
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08-22-2005 #3