d16 boosted driving fine without engine management !
05-13-2006, 09:56 AM
#31
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Join Date: Feb 2003
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Re: d16 boosted driving fine without engine management !
Originally Posted by underboost
Because we are adding air to the air side of the air fuel ratio with the turbo we must also add a proportional amount of fuel. If there is not enough fuel to compliment the extra air being forced into the cylinders a lean condition will be created which will cause detonation.
Originally Posted by underboost
If you want to know what detonation sounds like, take a couple of small ball bearings and put them in an empty aluminum soda can. Now shake the can vigorously and remember that sound. If you should ever hear that sound while driving your car you should avoid the condition (usually WOT, wide open throttle) that creates the sound until you can ascertain its cause.
Originally Posted by underboost
Also be aware that a lean condition makes more heat.
Originally Posted by underboost
The funny thing is that, generally speaking, leaner fuel mixtures create more power.
05-13-2006, 02:10 PM
#35
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Join Date: May 2005
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Re: d16 boosted driving fine without engine management !
Originally Posted by Joseph Davis
Originally Posted by underboost
generally speaking, leaner fuel mixtures create more power.
I beg to differ. Just going going from 12.8x to 11.8xx lost me about 4-5% torque. To me, that is not negligible. Going from 10 to 11 for example would make even more of a difference.
05-13-2006, 06:02 PM
#36
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Join Date: Feb 2003
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Re: d16 boosted driving fine without engine management !
From lean misfire to rich breakup, fuel *with ignition properly tuned* accounts for an average 3% variance in power. Two degrees of well placed ignition timing will do you better.
Noticeable changes in power from small variances in AFR are a good sign of ignition timing fuckage.
Noticeable changes in power from small variances in AFR are a good sign of ignition timing fuckage.
05-14-2006, 01:18 PM
#37
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Join Date: May 2005
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Re: d16 boosted driving fine without engine management !
Originally Posted by Joseph Davis
From lean misfire to rich breakup, fuel *with ignition properly tuned* accounts for an average 3% variance in power. Two degrees of well placed ignition timing will do you better.
Noticeable changes in power from small variances in AFR are a good sign of ignition timing fuckage.
Noticeable changes in power from small variances in AFR are a good sign of ignition timing fuckage.
Lean misfire is cause by ignition breakup. That is contributed by a weak ignition system or poorly gapped plugs <- catch 22, gapping the plugs down creates a weaker spark.
05-14-2006, 03:16 PM
#39
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Join Date: Feb 2003
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Re: d16 boosted driving fine without engine management !
MADMAX, I disagree slightly to strongly with everything except gap is in direct proportion to spark strength - ASSuming constant air gap resistance, which does not occur in turbo, or any, gasoline engine.
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