Cam timing problem lt1

Ed Wright · 07-02-2008, 11:01 AM

If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset.

Chad Rhodes · 07-02-2008, 04:14 PM

Quote:

Originally Posted by Ed Wright

If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset.

i knew that there was something to that, but i did't know how to put it in words

Sean221A · 07-08-2008, 05:44 PM

The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

Ed Wright · 07-08-2008, 06:22 PM

Quote:

Originally Posted by Sean221A

The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

Do you have a timing pointer on it? If so, I set the idle area of the spark table to some round value, like 20 or 30 degrees, then check the timing with a light. If they do not (And you have an XFI system) agree just change the "Crank Reference Angle" value found under "Operational Parameters" (upper/right corner of that dialog box) until the timing pointer agrees with the numbers in your spark table. Mine was set to 3 when I was still running an Optispark. If you have the older FAST, it's probably the same deal, but I don't know that everything is named the same. Mine is the XFI system. If you don't have a timing pointer you sure need to rig one up, otherwise you have no way of knowing for sure how much timing your running.

Good luck, Ed

Sean221A · 07-10-2008, 05:31 PM

Thanks Ed i will be sure to try that. Yes it is the XFI system. We've got a pointer rigged up so we will have to try and see as per your directions what it does. Thank you very much will get back to you and appreciate the help.

07-02-2008, 11:01 AM	#1
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Cam timing problem lt1 If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset. __________________ Ed Wright 4156 SS/JA

07-08-2008, 05:44 PM	#3
Sean221A Junior Member Join Date: Apr 2008 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Cam timing problem lt1 The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

07-10-2008, 05:31 PM	#5
Sean221A Junior Member Join Date: Apr 2008 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Cam timing problem lt1 Thanks Ed i will be sure to try that. Yes it is the XFI system. We've got a pointer rigged up so we will have to try and see as per your directions what it does. Thank you very much will get back to you and appreciate the help.

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