slowfive0
06-06-2006, 07:14 AM
Hi Don,
I copied and pasted this from another thread. Just trying to figure this system out. Any help you can provide is most appreciated. Thanks.
Re: Big Stuff 3 Tech Support
--------------------------------------------------------------------------------
Attention Don,
Sorry for the HUGE post , but just trying to consolidate my original questions. Sparky said you might be able to help. Thank you for any assistance you can provide. Here goes……..
I'm attempting to hook up my BS3 & MSD 6AL (SBF combo in 93 mustang).
1st question, I need to provide a coil negative signal to the TFI module (5th spot down from top of diagram). For clarification, since I'm using the factory TFI ignition, I should be hooking up the white wire (from my MSD 6AL) to it and I should NOT be hooking up the white wire from the BS3 to it. Is this correct?
__________________________________________________ ______________________
2nd question, I was noticing on the diagram that Sparky provided that there is "START" power applied to pin 4 (like the factory does), but the BS3 instructions don't show that terminal having power applied to it???? Do I need to provide "START" power to it? Obviously, “START” would mean B+ in the crank position ONLY.
__________________________________________________ ______________________
3rd question, with the system wired this way, will I have "Sequential" fuel injection?
I understand that the BS3 is sequential fuel injection system, but I was somewhat confused by the earlier post (see below). According to that post, to support individual cylinder timing, you need the BS3 cam sensor hooked up. This doesn’t make sense to me because for sequential fuel injection, the computer must know the position of the camshaft too---it gets that info from the distributor. The different size window in the distributor is how the computer knows where the cam position is. This window serves the same purpose with regards to injector timing as the camshaft position sensor does on newer cars. If this is the case why wouldn't the "individual cylinder timing" feature work when the system is just wired via the TFI?
<<<<<<<<<<<<<<<The BS3 supports Sequential Fuel without the need for a cam Sync. All BS3 systems are configured with Sequential fuel with all of the different types of Ignition triggers that the BS3 supports, unless otherwise specified.
In order to support Individual Cylinder Timing you will need a cam sync reference. If you're not using Individual Cylinder Timing then just leave the Cam connector disconnected.
I hope this helps,
Sparky>>>>>>>>>>>>>>>>>>
__________________________________________________ ______________________
In reference to the post by “Lazyone” (see below), here was my post.
If you're talking SBF, I believe the cam reference is obtained from the TFI module (factory setup). More specifically the PIP signal (please correct me if I'm wrong). There is a trigger wheel inside the distributor with windows. One of the windows is bigger or smaller (I forget). The distributor will make one complete revolution (fire all 8 plugs) in the time that the crankshaft makes 2 revolutions. Based off that window, the pcm knows when # 1 cylinder is at TDC on compression and when it should fire the # 1 injector (Sequential Injection). Obviously, once it knows when to fire #1, the rest fall right in line.
Final question:
This is what I don't understand---if BS3 knows where # 1 TDC compression is based off the PIP signal, then why can't it control individual cylinder timing. Same difference I would think? Now maybe BS3 doesn't know or use that signal like the factory??? Maybe it just fires each injector once per cylinder per crankshaft revolution regardless of whether or not the cylinder is on compression or exhaust??? Maybe it uses some other logic like “Compression Sense” ignition where it doesn’t need the camshaft position sensor?
Quote:
Originally Posted by LazyoneIn reference to running the BS3 in sequential mode, where do you get the cam sync reference from? I assume you have to plug in the cam connector, but where? We tried to fire our car up with the cam connector unplugged. The car popped and banged like wartime in a third world country. Pulled the plugs, they were soaking wet which explains all of the back fire/popping when trying to start the car. Any clarification would greatly be appreciated.
Not trying to be a pain, just trying to understand what the system is capable of given my system setup and how it works. Thanks for all your help!!! Best regards!
__________________
93 notch
364
Procharger D2-R
Dynamic M2 C-4
3.73
--------------------------------------------------------------------------------
Last edited by slowfive0 : 06-03-2006 at 12:29 PM.
I copied and pasted this from another thread. Just trying to figure this system out. Any help you can provide is most appreciated. Thanks.
Re: Big Stuff 3 Tech Support
--------------------------------------------------------------------------------
Attention Don,
Sorry for the HUGE post , but just trying to consolidate my original questions. Sparky said you might be able to help. Thank you for any assistance you can provide. Here goes……..
I'm attempting to hook up my BS3 & MSD 6AL (SBF combo in 93 mustang).
1st question, I need to provide a coil negative signal to the TFI module (5th spot down from top of diagram). For clarification, since I'm using the factory TFI ignition, I should be hooking up the white wire (from my MSD 6AL) to it and I should NOT be hooking up the white wire from the BS3 to it. Is this correct?
__________________________________________________ ______________________
2nd question, I was noticing on the diagram that Sparky provided that there is "START" power applied to pin 4 (like the factory does), but the BS3 instructions don't show that terminal having power applied to it???? Do I need to provide "START" power to it? Obviously, “START” would mean B+ in the crank position ONLY.
__________________________________________________ ______________________
3rd question, with the system wired this way, will I have "Sequential" fuel injection?
I understand that the BS3 is sequential fuel injection system, but I was somewhat confused by the earlier post (see below). According to that post, to support individual cylinder timing, you need the BS3 cam sensor hooked up. This doesn’t make sense to me because for sequential fuel injection, the computer must know the position of the camshaft too---it gets that info from the distributor. The different size window in the distributor is how the computer knows where the cam position is. This window serves the same purpose with regards to injector timing as the camshaft position sensor does on newer cars. If this is the case why wouldn't the "individual cylinder timing" feature work when the system is just wired via the TFI?
<<<<<<<<<<<<<<<The BS3 supports Sequential Fuel without the need for a cam Sync. All BS3 systems are configured with Sequential fuel with all of the different types of Ignition triggers that the BS3 supports, unless otherwise specified.
In order to support Individual Cylinder Timing you will need a cam sync reference. If you're not using Individual Cylinder Timing then just leave the Cam connector disconnected.
I hope this helps,
Sparky>>>>>>>>>>>>>>>>>>
__________________________________________________ ______________________
In reference to the post by “Lazyone” (see below), here was my post.
If you're talking SBF, I believe the cam reference is obtained from the TFI module (factory setup). More specifically the PIP signal (please correct me if I'm wrong). There is a trigger wheel inside the distributor with windows. One of the windows is bigger or smaller (I forget). The distributor will make one complete revolution (fire all 8 plugs) in the time that the crankshaft makes 2 revolutions. Based off that window, the pcm knows when # 1 cylinder is at TDC on compression and when it should fire the # 1 injector (Sequential Injection). Obviously, once it knows when to fire #1, the rest fall right in line.
Final question:
This is what I don't understand---if BS3 knows where # 1 TDC compression is based off the PIP signal, then why can't it control individual cylinder timing. Same difference I would think? Now maybe BS3 doesn't know or use that signal like the factory??? Maybe it just fires each injector once per cylinder per crankshaft revolution regardless of whether or not the cylinder is on compression or exhaust??? Maybe it uses some other logic like “Compression Sense” ignition where it doesn’t need the camshaft position sensor?
Quote:
Originally Posted by LazyoneIn reference to running the BS3 in sequential mode, where do you get the cam sync reference from? I assume you have to plug in the cam connector, but where? We tried to fire our car up with the cam connector unplugged. The car popped and banged like wartime in a third world country. Pulled the plugs, they were soaking wet which explains all of the back fire/popping when trying to start the car. Any clarification would greatly be appreciated.
Not trying to be a pain, just trying to understand what the system is capable of given my system setup and how it works. Thanks for all your help!!! Best regards!
__________________
93 notch
364
Procharger D2-R
Dynamic M2 C-4
3.73
--------------------------------------------------------------------------------
Last edited by slowfive0 : 06-03-2006 at 12:29 PM.