Info on a cam.

[Ed Doe]

Ed as much as I love you mate, what you have just said is utter bollocks.
I'm running different manifolds on my 1.8 and ir runs faultlessly except for a dodgy ICV.
I didn't just bolt it on. I did a lot of research into it after some of the stories I read including looking into the set parameters on the base map and it can easily handle it.
Mine at the moment is running very clean and not rich or lean at all (ignoring the fact my oil seals have gone and it's burning oil but that's being sorted next month)
Sorry mate but I can't stand it when people say these things when they haven't looked into it. If you were running gti injectors then you would be correct as they have a higher flow which the engine management can't detect.

Dunno if you remember that C.A.R off pugnet, and possibly kicking about on here?

He had a black 1.8xs with the inlet mani and exhaust mani. he got mega borewash and the car shit itself.
So he bought a 1.8 cab and the same thing happened iirc.
and then there was Adam, who you probs wont remember; he had a MINT 1.8 which he did the same thing, and that shit itself too iirc.
And I could've sworn yours was running really rich last time I saw you?? Might be my imagination, but it was pretty honking when I was behind you (just before you cut out on the roundabout!! lol)

Anyways, on the above evidence, I was under the impression it was a very bad idea, but as you say, I haven't researched into it so I'm open to the concept that I may be wrong...


If i am, then Dum I apologise for shooting you down with my opinionated rant!!

But AFAIK, the ecu has a 'base value' for the amount of fuel it can deliver at a given throttle position at a particular rpm. It can 'trim' the fuel value to a certain tolerance by taking into account the maf sensor reading and the lambda sensor reading, so it keeps the afr as close to perfect as possible. IIRC the ecu's certainly on the '6 are very good at 'learning' so they optimise the fuelling trim depending on how you drive.

However, as I was aware, the fuel can only be trimmed a small amount, so in order to take advantage of manifold changes etc, you have to alter the 'base' fuel parameters on the map. Hence, sticking cams or bodies or different manifolds on an engine wihtout a re-map will affect how much air can get into the engine, but if it is significantly more than the fuelling trim can work with, it'll run lean, which will be bad for the car.

I'm pretty certain I've got this right, but again I'm open to corrections; I'm on here to learn just as much as everyone else!!!