LT-1 issue

[John Nechiporchik]

Ed, I have an MSD crank trigger on the car now. Also have an MSD cap and rotor on the opti. My question relates to using the Optispark disc/sensor to activate the cam position signal with the XFI system. It appears that FAST makes a wiring harness that plugs into the opti that provides the signal for the sequential injection. There is no mention in the instruction relative to any modifications that need to be made to the opti disc (wheel). That is what I would like to know.

John

[Ed Wright]

There is a way, can't remember how they did it. Maybe David Page will see this. Seems like guys are covering all but one slot? If you don't have 8 wide bands so you can adjust individual cylinders, there is no real reason for sequential modd.

[Alan Roehrich]

John,
You need to talk to Kevin at FAST. Tim Cole at Comp sent me to him, he will take great care of you, before, during, and after the sale.

[John Nechiporchik]

Ed, I understand your comment about 8 wide bands and I am not planning on that expense.
Can the XFI system be run in batch mode?
Also, Maybe I would be better off looking into the new FAST Sportsman unit.

John

[ss3011]

PM sent

[John Nechiporchik]

Also, maybe I should also look at Big Stuff. Anyone running there stuff on LT1?
Thoughts/input??

John

[Rich Biebel]

You can run the crank trigger completely independent from the ECU. I ran mine that way and just ran locked timing with a MSD 7 and later a digital 6. Accel GEN VII. Sure there's power to be gained in sequentual mode but it takes a lot to make that happen. I ran one wire from the ECU to the MSD and ran the crank trigger just like a non EFI race engine. MSD cap and rotor and optispark guts removed.

[Ed Wright]

Only way there is more power in Sequential Modevis tuning each cylinder individually. Of course, otherwise it runs in Batch Fire. And how much depends on how far your cylinder-to-cylinder fueling and spark is.
BS3 runs just fine on an LT1. A friend of mine is running that on his.I have worked with BS3, ACCEL DFI, GM's MEFI, and Holley (both old & new systems) and I much prefer FAST. Holley's new system would be my second choice. I'm not going into it here, but I can make FAST XFI do something I can't make the others do. Maybe the new Holley, if I had the time.

[John Nechiporchik]

Update # 2:
After much discussion and several adult beverages to assure clear thinking.....Today I spent the big bucks and got a FAST XFI 2.0 system coming my way.
Hopefully my next update will report on a satisfactory outcome to this issue.
Thanks for everyone's input.

John