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Pud237 · 13-05-2008

Originally Posted by ukoldschool

yes, but they say that to cover their back witht he extra ron acting as a resistance against potential knock where theyve moved the ignition points about.
They reccomend it not because it will provide any extra power by using it, but if you dont your car may suffer reduced performance, or actually die

But the remap/chip does provide extra power..

Where do you think that power comes from? It can only be from either retarding (EDIT: advancing?) the ignition, or leaning off the mixture, both of which provide more power, but both also make a fuel more likely to knock.. So to prevent that, 98 octane is recommended. If you got a remap and used 95, it might be OK, but then the engine gets a bit warm and starts knocking, the knock sensor tells the ECU to bring the ignition points back down and you are effectively then running minus your remap. If you didn't have a knock sensor then yeah, the timing would stay at the "remapped" levels and it would knock itself to death.

13-05-2008	#52 (Post Link)
Pud237 AO Platinum Member Join Date: Apr 2006 Location: North Yorkshire Posts: 13,537 Member car: Alfa 156	Re: Rolling Road last night. Originally Posted by ukoldschool yes, but they say that to cover their back witht he extra ron acting as a resistance against potential knock where theyve moved the ignition points about. They reccomend it not because it will provide any extra power by using it, but if you dont your car may suffer reduced performance, or actually die But the remap/chip does provide extra power.. Where do you think that power comes from? It can only be from either retarding (EDIT: advancing?) the ignition, or leaning off the mixture, both of which provide more power, but both also make a fuel more likely to knock.. So to prevent that, 98 octane is recommended. If you got a remap and used 95, it might be OK, but then the engine gets a bit warm and starts knocking, the knock sensor tells the ECU to bring the ignition points back down and you are effectively then running minus your remap. If you didn't have a knock sensor then yeah, the timing would stay at the "remapped" levels and it would knock itself to death. Back on the road: Alfa 156 3.0 24v V6, Silver with red leather, Q2 diff, GTA Teledials, headlights & inlet manifold, AutoDelta carbon intake, decat pipe and SuperSprint rear box, FK coilovers, Dastek Unichip - my 245bhp beast! Gone but not forgotten: Alfa 156 2.4 JTD Veloce, Vela Blu, Angel 'mad map' & BMC CDA, Ferodo DS2500s - the fastest tractor in town! AO 'Bratpacker' No 5. Last edited by Pud237 : 13-05-2008 at 20:20.