ak072007
Member
Registered: 4th Jun 11
User status: Offline
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I've done all the standard airbox mods, (drilling, removed plastic pipe in lid, removed vacuum flap mechanism, removed hot air feed).
Got a lovely noise when accelerating, and probably a little bit more pokey on acceleration 2nd/3rd gear. Also I have reset the ECU.
My question is, with a standard ECU and parameters, how does the ECU know to burn fuel to the correct air ratio?
My car is running nice and cool now, not overheating like it used to, but I"m worried it may start running lean due to too much cold air and not enough fuel.
Any ways to adjust the ratio apart from a re-map? I know you could do it on the old carburettors?
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Eddx14xe
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Registered: 12th Jan 10
Location: Hertfordshire
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It should read the air fuel ratio with the lambda sensor and sort it out on its own. Thats what i always thought anyway.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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No, no way of doing it without either just upping the fuel pressure or getting a piggyback ECU
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ak072007
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Registered: 4th Jun 11
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Yeah the sensors sort it out as far as the standard ECU will let it because it is limited I think.
Alan I've been looking at fuel pressure regulators (basically boost gauges but can be used for non-turbo injected engines) but I reckon I'll just be constantly topping up.
I don't fancy using one of those piggyback resistors, I've read too much negative on them. I actually bought a job lot and used to sell them, a guy with a corsa 1.4 emailed me and reckoned he had it on rolling road and got 10bhp out of one lol. He only paid me 3 pounds.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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A fuel press reg isn't anything to do with boost, all it does is allow more fuel through to be injected. If you don't up the amount of air entering along with it (ie - through forced induction) all you'll end up doing is overfuelling.
I wasn't talking about ebay resistors lol I mean a piggyback ECU.
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tom_simes
Show Staff
Organiser: South Wales
Premium Member
Registered: 12th Jan 05
Location: Undy, Newport Drives: Skoda Octavia vRS estate
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quote:
Originally posted by Eddx14xe
It should read the air fuel ratio with the lambda sensor and sort it out on its own.
This is true, and what will happen. Don't worry about it.
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AlexW
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Registered: 25th Oct 08
Location: Essex
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I doubt if you are getting more air in, Just better flow and maybe a bit colder, ECU will be able to cope with it fine, Its not like your putting 5psi or more of boost into it.
What engine is it?
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BeetleGav
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Registered: 27th Jun 10
Location: lancashire, nelson
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could my drilled airbox be to blame for my car having a flat spot sometimes?
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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Very unlikely Beetlegav
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Robo C20Let
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Registered: 22nd Feb 10
Location: Somewhere inside your mom !!!
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get a fuel pressure regulator, all it does is create more pressure in the fuel rail which forces more fuel into the engine then just adjust it using a wideband
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