LT-1 issue - Page 6

John Nechiporchik · 04-17-2015, 04:44 PM

Thanks for checking Mike.

John Nechiporchik · 04-27-2015, 03:10 PM

Update: Got the verdict back from the guy who tested my ECU and determined it was no good.
The second, non crank trigger unit I sent was OK.
My options are: Use the non crank trigger Accel unit and dis able the existing crank trigger and activating the Optispark........ or bite the bullet and install a FAST system.
I'm not inclined to use the Accel as it is just more "old stuff". But, a lot less costly.
I would like to hear from someone that has installed an XFI 2.0 on an LT1 and get a clear understanding on utilizing the optispark sensor and disc as the cam sensor for the XFI.....and what modifications, if any, are required to the disc. I'd like a better understanding of the installation process before I proceed.
Thanks . I'm sure I'll have additional questions.

John

Ed Wright · 04-27-2015, 04:04 PM

I have a FAST XFI on my LT1. Had the Optispark on it when it originally an LT1 block. Slung the blades off the rotor right away. Learned to remove those two plastic pegs holding the two piece rotor blade in place. Drilled the rotor for and installed two long 1/8" aluminum pop rivets to hold the blades in place. No more rotor coming apart problems. MSD now makes a rotor with screws holding it together. FAST has instructions for triggering it with the Opti if you want. I use an MSD crank trigger. FAST also has their own crank trigger now. Not at the time Input my mess together.

John Nechiporchik · 04-27-2015, 05:08 PM

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 · 04-27-2015, 05:56 PM

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 · 04-27-2015, 06:13 PM

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 · 04-27-2015, 06:15 PM

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 · 04-27-2015, 07:11 PM

PM sent

John Nechiporchik · 04-27-2015, 07:25 PM

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

John

Rich Biebel · 04-27-2015, 07:32 PM

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.

04-17-2015, 04:44 PM	#51
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 315 Likes: 74 Liked 12 Times in 6 Posts	Re: LT-1 issue Thanks for checking Mike.

04-27-2015, 03:10 PM	#52
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 315 Likes: 74 Liked 12 Times in 6 Posts	Re: LT-1 issue Update: Got the verdict back from the guy who tested my ECU and determined it was no good. The second, non crank trigger unit I sent was OK. My options are: Use the non crank trigger Accel unit and dis able the existing crank trigger and activating the Optispark........ or bite the bullet and install a FAST system. I'm not inclined to use the Accel as it is just more "old stuff". But, a lot less costly. I would like to hear from someone that has installed an XFI 2.0 on an LT1 and get a clear understanding on utilizing the optispark sensor and disc as the cam sensor for the XFI.....and what modifications, if any, are required to the disc. I'd like a better understanding of the installation process before I proceed. Thanks . I'm sure I'll have additional questions. John

04-27-2015, 04:04 PM	#53
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: LT-1 issue I have a FAST XFI on my LT1. Had the Optispark on it when it originally an LT1 block. Slung the blades off the rotor right away. Learned to remove those two plastic pegs holding the two piece rotor blade in place. Drilled the rotor for and installed two long 1/8" aluminum pop rivets to hold the blades in place. No more rotor coming apart problems. MSD now makes a rotor with screws holding it together. FAST has instructions for triggering it with the Opti if you want. I use an MSD crank trigger. FAST also has their own crank trigger now. Not at the time Input my mess together. __________________ Ed Wright 4156 SS/JA

04-27-2015, 05:08 PM	#54
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 315 Likes: 74 Liked 12 Times in 6 Posts	Re: LT-1 issue 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

04-27-2015, 05:56 PM	#55
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: LT-1 issue 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. __________________ Ed Wright 4156 SS/JA

04-27-2015, 06:13 PM	#56
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,910 Likes: 994 Liked 1,035 Times in 271 Posts	Re: LT-1 issue 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. __________________ Alan Roehrich 212A G/S

04-27-2015, 06:15 PM	#57
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 315 Likes: 74 Liked 12 Times in 6 Posts	Re: LT-1 issue 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

04-27-2015, 07:11 PM	#58
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 Posts	Re: LT-1 issue PM sent

04-27-2015, 07:25 PM	#59
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 315 Likes: 74 Liked 12 Times in 6 Posts	Re: LT-1 issue Also, maybe I should also look at Big Stuff. Anyone running there stuff on LT1? Thoughts/input?? John

04-27-2015, 07:32 PM	#60
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: LT-1 issue 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. __________________ Rich Biebel S/C 1479