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[gregk2]

Been reading up recently on Corsa VXR's and the problem they have with "melting" piston 4.
A range of theories seem to be out there as to what causes this, one tuner claims the injectors: Article http://corsavxrracing.info/pdfs/corsaVXRInjectorArticle.pdf

But many refute this and a common explanation seems to be driving the car hard on low fuel, swirl pot not coping and air bubbles being sucked into the fuel system, many advocating not driving at full throttle under 1/4 of a tank! This worries me as i tend to drive the Brabus hard on low fuel often (Race level fuel i like to think of it!)

Thoughts and opinions?

[mozilla]

Better safe than sorry but you would feel the cuts in power when air would go through instead of fuel. Experienced them on other cars when low on fuel but never on the brab so I'd say fuel tank/delivery is well designed.

[Problemchild]

It's a Vauxhall that's tuned and driven hard by chavs - what do they expect

JJ

[gregk2]

It's a Vauxhall that's tuned and driven hard by chavs - what do they expect

JJ

I think it's a bit harsh tarring all owners with the same brush! My girlfriend has one and she's far from chavvy! I do agree they tend to attract the wrong sorts quite a lot though.

[Problemchild]

Has hers had any issues?

I wasn't referring to all owner, just the ones who have already driven them into the ground after cheapo remaps

JJ

[gregk2]

No...but she drives like miss daisy! And hasn't had any remap or modification, apart from the factory fitted "Nurburgring edition" upgrades like  mechanical limited slip differential, Bilstein dampers, stiffer springs, forged wheels, Brembo brakes..it really is wasted on her...luckily i'll be insured to drive it soon 

[Brabs]

Sounds a bit weird to me! Nowhere in the owner manual is there any mention/warning about driving on low fuel... and apart from the obvious as to you might run out soon I have never heard of a problem. Certainly no Brabus owner on this forum has mentioned anything. In the old days there might have been an issue of muck being sucked through into the carburettor but now I would think that all cars have a filtration system.

 

[Problemchild]

That's a beast - how much?

Figures etc??

Comparison to brab??

JJ

[gregk2]

That's a beast - how much?

Figures etc??

Comparison to brab??

JJ

about 205 bhp and 200 ish ft lb

can't really tell how it compares to the brab speed wise, it's a less harsh ride but never really seen it driven in anger...there's a bloody boofle in the window for gods sake! 

[CrazyG]

Been reading up recently on Corsa VXR's and the problem they have with "melting" piston 4.
... a common explanation seems to be driving the car hard on low fuel, swirl pot not coping and air bubbles being sucked into the fuel system.....

If there was any relevance to the speculation about low fuel and air etc...then all the pistons would
suffer from degradation/melt/whatever.  So that's b#llsh@t.   It's possibly like the early ForTwo's,
where the furthest cylinder gets hottest due to being furthest away from the pump/rad or not enough
airflow round the exhaust manifold or the block/head at no.4, so it get a localised hotspot.. etc..
Or....it could just be bad design on Vauxhalls part, where no.4 gets the weakest and most damaging
mixture due to poor inlet/exhust manifold design/s or similar.
Either way, low fuel can't be the problem....as mozilla rightly says...the power would drop off
if any air or air 'supplemented' fuel was delivered.

[mozilla]

I wouldnt discount it as BS just yet, accelerating does push everything to the back including fuel, and less fuel is easier to throw back.  If the injectors put air in the cylinders, the mixture gets momentarily lean which COULD lead to pre-ignition and knocking. Best way to knacker a pistons bearings etc

Diesels on the other hand don't care too much about lean mixtures and knock with their high pressure injectors, lack of throttle plates and heavy duty engine components. My next car is definitely going to be diesel 

[CrazyG]

Ok...I take your point..but if it is a low fuelling problem, then my
other comment of... "...it could just be bad design on Vauxhalls part..."
most definitely comes into play.

[Brabs]

Still sounds lik BS to me!

 

[mr singh]

i regularly give my forfour some shoe all the way down to the reserve and its done 105200 miles now, bought it at 69,000 miles 2/3 years ago and never really had issues with it running, its now started throwing the teddy out of the pram with the fuel gauge giving highly inaccurate readings, dropping off and coming back flashing for about 5 min and then showing the supposed fuel level. iv got a new fuel sender to fit, just need to find the time and fuel level to fit it