One of the drawbacks to running an aftermarket PCM (ie. Big Stuff 3, F.A.S.T. or D.F.I.) is the need to still utilize the Opti-spark signal in order to generate ignition spark. In my case, I prefer to use an 8 coil-on-plug style system and would like to operate the PCM in the "sequential" mode, thus allowing more tuning capabilities. This necessitates the use of as LSx style PCM which requires both a crank signal (24x) and a cam signal (strictly to locate #1 TDC). I know John @ Big Stuff 3 has available his own crank trigger and wheel with the necessary 24x signal, but no one seems to have addressed the cam sync signal issue. Is there anyone else that has these simular needs??? If so, how was the cam sync signal generated? I know there are a couple of options here...1. Modify and/or replace the LT-1 intake to accept a distributor or shaft that generates a cam signal 2. Modify the Opti-spark unit to accept a pick-up and reluctor that references #1 TDC. 3. Modify the existing reluctor wheel in the Opti-spark unit so it will only reference when the motor is @ #1 TDC. I have spoken to a Big Stuff 3 dealer that has be confronted with this problem before and says he has a source to obtain a new reluctor wheel with the necessary window(s) to correctly locate #1 TDC, but needs an interest from a few people in order to justify manufacturing these wheels. Is there any interest out there for such a wheel to be made??? Also curious as to what others have chosen to do? (sorry for the longwinded post!)

 

well I run gen7 and alpha-N
Just went with a MSD flying magnet...had to fab a bracket. I have seen people cut the intake and run a dual sinc also.....seems that would be simple

 

The factory service manual for my 1999 Z28 says the cam sync signal is not *required* (although it will throw a trouble code). It says the PCM can determine cam sync with the crank sensor alone, but that cranking times may be extended because the PCM may need extra rotations to determine the cam position if it "guesses" incorrectly.

 

There is a guy on here who already modded an opti for an LS1 cam signal. His handle is 95 Z/28 LT1. Some shop did it for him. I'm hoping he will finish his project as I believe his BS3 setup will be the best system around. The only thing I don't like is I would have to get rid of my delteq and use those hideous LS1 coils.LOL.

 

I currently run the Bob Baily LTCC system utilizing the 8 coils and was able to mount 2 seperate homemade custom brackets to the firewall above the intake (making them accessible, but out of sight) as I refused to mount the coils to the valve covers.

 

If you end up getting the BS3 you can sell your Bob Bailey box. Your location is good but I think if I end up going to BS3 I will mount the coil packs under the radiator and run the plug wires under the headers. Very clean and easy to work on.

 

I considered mounting the coils in that location but I originally had ATI's intercooler mounted under the car in that general direction and just thought that there was too much going on there. Maybe now with the FMIC, I'll have some more room and will consider moving them to the lower rad. support.

The hurdle I have to get over right now is the cam sensor issue. I was hoping there would be an interest in a "cam signal sensor" for the LT-1, so that I didn't have to fabricate this myself. I'm beginning to accept the fact that the LT-1 is now considered to be somewhat outdated since it is 10 years old and is definately over-shadowed by the LSx motor.

 

Here is a thread that was in forced induction a few months ago. Page 2 and 3 talk a little about the cam signal he made.

http://web.camaross.com/forums/showt...ight=bigstuff3

 

I run 8 LS1-style coils and full sequential injection, using the Opti signals to feed a MoTeC M48Pro ECU, and their IEX 8-channel ignition driver.

 

Fred-I've read a little about your aftermarket PCM system, but the information seems to be somewhat limited, I've also heard that the software is not as "user friendly" as some of the other systems...what's your opinion? Does the MoTec have data logging capabilities?

 

Fred,

How much would it cost to get a system like yours with options for wideband O2 control for a blower only engine?

 

I bought my M48Pro used for $1500, about 1/2 of what they cost new at the time. A full access tuning/logging license and interface cable costs $500, with lifetime updates of all software. The IEX ignition module added about $450. Data logging comes with the tuning license and includes the capability to record a running total of about 15 minutes of engine operation, depending how fast you set the sampling rate. I can get a full pass at the track, from the tmie I start the engine in the pits and all the way back to the pits, at a 25 sample/second rate. If that's not enough, there are optional upgrades that will collect hours of data.

The wide-band is optional (the system has a huge number of features that can be turned on if you pay for them). At one time the wide-band option was over $1,000 but they have changed the models, capabilities and pricing since I got mine 7 years ago. Current model is the M800.

The intitial tune was done by the shop that built my engine and tuned it. Making minor changes is fairly straight forward.

The MoTeC website has a lot of info....

http://www.motec.com/home.htm

 

any updates on this?
im looking to run BS3 and stumbled onto this during a search

 

Just got this to work with the help of a great shop, a couple experts, lots of time and money a few days ago. I'll make sure to get pictures and info up after a while. It's busy here at work. 18 hours today...

I'm the first one to get a LS1 BS3 to work on a LT1 with a converted opti though.

 

No I was!!! It is a very cool set up and you should be very proud of thinking outside the box. It was not plug and play, but well worth it in my opinion.