does adding timing take away from top end
11-25-2007, 03:26 PM
#2
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Think of ignition timing like being up to bat at the plate. Swing too soon and you hit a quick line-drive foul ball (and you may even take out a buddy or two in the dugout - detonation). Swing too late and it's a weak foul ball. Swing just right and you sky a homerun 500+ft dead centerfield.
The point is, more timing isn't always better. The easiest way to find optimal timing is on a dyno. Make some changes, keep what works, and ditch what doesn't. Arbitrarily adding timing isn't going to do you any good.
That being said, running more than 29* before/after peak torque or more than 26* at peak torque will probably be too much and cause KR on a stock 98~00 f-body. 01~02 f-bodies don't seem to like more than 20~22* just before peak torque, 18~19* at peak torque, and topping off around 24* at redline. At least, that's what I've noticed being ~800ft above sea level. Change the altitude up and the game changes.
The point is, more timing isn't always better. The easiest way to find optimal timing is on a dyno. Make some changes, keep what works, and ditch what doesn't. Arbitrarily adding timing isn't going to do you any good.
That being said, running more than 29* before/after peak torque or more than 26* at peak torque will probably be too much and cause KR on a stock 98~00 f-body. 01~02 f-bodies don't seem to like more than 20~22* just before peak torque, 18~19* at peak torque, and topping off around 24* at redline. At least, that's what I've noticed being ~800ft above sea level. Change the altitude up and the game changes.
Last edited by SSpdDmon; 11-25-2007 at 07:23 PM.
11-26-2007, 01:41 PM
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I'd say, more often than not, dialing in the AFR is where most of the power gains are on stock setups. You can try adding a couple degrees of timing if you have dyno runs to do back-to-back comparisons on. But (again), arbitrarily adding timing to a stock motor isn't something I'd suggest to anyone.
