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Re: how much timing on a built z6
it was like 28* to 5psi. then it backed down to 24 to 20psi. I just wanted to get the turbo spooled up quicker, so i was hoping i could run mid 20's to 5-8 psi. from 10 on, i have 19.something
My cr is probably around 8.8-9:1 Running 19 psi. |
Re: how much timing on a built z6
Originally Posted by Foowee
Doc, timing should be retarded before torque peak. After you reach this point where maximum cylinder filling occurs, you can then advance the timing to gain ponies.
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Re: how much timing on a built z6
Retarding timing causes faster spool, right until your exhaust valves glow cherry red and preignition sets in. Advancing timing focuses the burn inside the combustion chamber, until you begin the burn so early that the peak pressure occurs at a rod angle with poor leverage that the piston cant move down quickly enough (act as an expander) to keep pressures from rising and turning burn into detonation and destroying the engine. Play around between those points to find best throttle response and spool.
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Re: how much timing on a built z6
Originally Posted by Foowee
Doc, timing should be retarded before torque peak. After you reach this point where maximum cylinder filling occurs, you can then advance the timing to gain ponies.
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Re: how much timing on a built z6
Originally Posted by Dr.Boost
Are you sure that 30* wasn't BEFORE boost retard was set? I got a map from an unmentioned "tuner" on here and it had the timing set at 29* at the top of the map. :l
That program is known has the headgasket pooper |
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