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The APC IS an electronic boost control Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 31 Oct 2008 17:56:45
In Reply to: Re: Is this a good price for the following?, George, Fri, 31 Oct 2008 15:41:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The APC reduces boost when it detects knock. The trouble with a manual boost control is that people make a very poor knock detector. Yes, you can hear ping under load. The bad news is that with a turbo, by the time you hear the knock, you're well on your way to blowing holes in pistons.
Knock will vary with engine load, among other things. You'll have to adjust boost as load changes - for example, going up-hill under boost.
As the others have mentioned - the turbo engine has a lower compression ratio than a N/A. That's because turbocharging essentially increases the compression ratio. Higher compression, the more tendancy to knock. As to 91 octane, many turbo engines need at least 91 to not knock.
If you want to turbocharge a N/A engine, the best you can hope for is to run low boost- basically half boost of a full turbo. Any more, and the engine will be toast.
Please don't take this as a flame, but if you have to ask what it takes to make a N/A into a turbo, you shouldn't attempt it. Can it be done? Sure; folks have. But the folks that have done it usually have had quite a bit of experience - basically, they don't need to ask what to do.
posted by 75.25.4...
, Fri, 31 Oct 2008 15:49:04, Fri, 31 Oct 2008 17:56:45 <-- Viewing This Message
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