Do I need to do a "crank relearn"? New LS6
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On The Tree
Joined: Feb 2007
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Do I need to do a "crank relearn"? New LS6 I just had an LS6 built, New LS6 block, rebuilt LS6 heads and a new LS6 cam. Everything is in the car and running but the car has slowed down from the previous LS1 with LS6 heads and cam. Went from 12.5s to about 13.0 which is basically stock LS1 speed. Everything else seems normal, runs fine. So confused.
Any time you change the sensor or rebuild/ replace an engine you should preform a crank relearn.
That how ever is not causing the issue of running slower. Your old tune needs to be revised for your new combo.
What cam specs did you have before and what cam specs do you have now?
That how ever is not causing the issue of running slower. Your old tune needs to be revised for your new combo.
What cam specs did you have before and what cam specs do you have now?
Thread Starter
On The Tree
Joined: Feb 2007
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1FastBrick, read the post again. The only thing different from the 1st motor and the new motor is the LS6 Block, everything else is Exactly the same. I did NOT do a crank relearn and its running about .5 and 3 mph slower in the 1/4 mile. I'm wondering if the computer is trying to adjust my timing based on the original crank and sensor tolerances. I've read that the relucter wheel can be off just a mm and can affect timing.
Thanks for any input.
Thanks for any input.
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From: PDX-OR-USA
Cam timing was degreed via lobe timing ?
Validated alignment of crank timing sprocket?
Main bearing clearance for cam and crank correct?
Head gasket thickness and bore clearance?
Intake gaskets?
Validated alignment of crank timing sprocket?
Main bearing clearance for cam and crank correct?
Head gasket thickness and bore clearance?
Intake gaskets?
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