Preventing Detonation
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Joined: Feb 2001
Posts: 26,664
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From: n
Enough fuel...
Giving it more fuel to the point is starts to combust out the exhaust will also kill a motor.
Safe timing...
Too much advance - boom.
Too much retard, and it ends up burning out the exhaust like above...
Keep intake temps down...
FMIC really helps here.
-Ted
Giving it more fuel to the point is starts to combust out the exhaust will also kill a motor.
Safe timing...
Too much advance - boom.
Too much retard, and it ends up burning out the exhaust like above...
Keep intake temps down...
FMIC really helps here.
-Ted
Senior Member
Joined: Jan 2005
Posts: 326
Likes: 0
From: lexington south carolina
Originally Posted by RETed
Enough fuel...
Giving it more fuel to the point is starts to combust out the exhaust will also kill a motor.
Giving it more fuel to the point is starts to combust out the exhaust will also kill a motor.
as in popping flames? if so most rx7's i know are doomed
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Excess fuel will totally wash the oil film from the housings/irons, and thin the oil to the point where you start to risk spinning bearings, etc. At the very least, too much fuel means seriously accellerated wear on housings, seals and irons.
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Rotary Freak
Joined: Jun 2004
Posts: 2,718
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From: Ames, IA
What would the advantages, if any, of tuning lean instead of rich be? A lean enough mixture has the same properties as a rich mixture (higher effective octane due to a slower flame propagation speed), though less evaporative cooling.
It also has the advantage of a lowering of fuel pressure not taking the engine through the danger zone - it'll go from lean to "not running" instead of rich to detonation-zone to not running.
(this was discussed by Lynn E Hanover on nopistons at one point, but I don't know if it's actually been tried).
-=Russ=-
It also has the advantage of a lowering of fuel pressure not taking the engine through the danger zone - it'll go from lean to "not running" instead of rich to detonation-zone to not running.
(this was discussed by Lynn E Hanover on nopistons at one point, but I don't know if it's actually been tried).
-=Russ=-
Joined: Dec 2003
Posts: 6,598
Likes: 10
From: Temple, Texas (Central)
Leaning out the fuel a moderate amount will give you power and reduce fuel consumption. It is best to get someone that knows that they are doing to do it, preferably on a dyno with a wideband. You can also tune for a specific afr using an afr gauge, and safc(or similar) and a piece of road. Dont remember what the optimum afr is, isnt it something like 13-14?
Originally Posted by Sideways7
Leaning out the fuel a moderate amount will give you power and reduce fuel consumption. It is best to get someone that knows that they are doing to do it, preferably on a dyno with a wideband. You can also tune for a specific afr using an afr gauge, and safc(or similar) and a piece of road. Dont remember what the optimum afr is, isnt it something like 13-14?
OMG 13-14? I hope you mean for cruising.
Originally Posted by Sideways7
Oh, guess I was way off. What do you tune for, btw?
I'm not a "tuner" so don't take my oppinion with much weight. But i'm personally aiming for 12.5-12.8 for my N/a at the moment. I'd stay clear into the 11s for any forced induction. This is just from what i've seen others with similar setups.
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