I'm going to tactfully avoid any potential landmines in this thread, but I have to ask some questions:
Quote:
Originally Posted by Fast_Freddy
Do you fully understand how the stock ECU programming is designed to handle ignition timing advance? Hint: It requires a lot of knock correction.
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I'm not sure what exactly you mean by this? The OEM knock control strategy is well understood:
http://www.romraider.com/forum/viewt...hp?f=25&t=1840 - but I'm not sure what the statement above means?
Quote:
Originally Posted by Fast_Freddy
I appreciate your concern but I do believe that most people underestimate the capabilities of the Denso ECU and knock sensor.
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And I think people forget that we drive non-luxury vehicles (I hate the term econo-box) where costs and functionality are
always a trade-off. Knock sensors are far from infallible - that's why any tuner worth his salt will use Det cans and not just rely on the ECU knock parameters. There is a complex set of logic around noise filtering that make the knock sensor work to the best of its ability - but always keep in mind that once you tune a vehicle, you are stepping outside of the margins of safety that the OEM put in place, and potentially the specifications of any piece of hardware on the vehicle.
Quote:
Originally Posted by Fast_Freddy
Has anyone ever logged a stock tune to see what the KC looks like?
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Should be interesting - would not surprise me if there is knock, on poorer grade gasoline. Some JDM subarus that landed up in the Australian market were notorious for severe knock, from the factory - since they were set up for higher octane fuel.
Bottom line is that knock control is a safe-guard - but a relatively knock free tune to start with is preferable. Prevention is better than cure - and if you're logging knock, especially in higher load areas, it will eventually catch up with your engine.