C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Timing?

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Old Jun 7, 2008 | 09:37 AM
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Default Timing?

My 89 auto is set at 6-BTDC. Some suggest it be set at 8-BTDC. What improvement or differences can you expect. What positive by changing the setting, what negative, anything of significance?
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Old Jun 7, 2008 | 09:43 AM
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bump it to 8 and drive it, if you like it go to 10. If you have trouble with it pinging or you don't feel a difference put it back.

It takes 5 minutes to do so why ask?

Just do it
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Old Jun 7, 2008 | 09:59 AM
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Timing changes will vary in outcome based on modifications and general tune up condition of the car. Each car is different. My 85 likes (enjoys) 8-10*. Make the change, drive it and see if you like it. Easy change and can always reverse it. Not like bolting on heads.
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Old Jun 7, 2008 | 10:01 AM
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Be aware that any changes in timing will be added/subtracted from the whole timing table. So don't go too crazy.
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Old Jun 7, 2008 | 01:54 PM
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What positive by changing the setting, what negative, anything of significance?
Advancing base timing will give snappier throttle response; the danger is that you may get knock counts during at WOT burst at higher RPM.

A scanner will tell the tale on the knock counts.

I had been running 10deg BTDC but recently dropped back to 6deg due to observed knock retard. I now notice that throttle response off idle is not nearly as snappy.
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