Hi,

I've been told my vRS is overboosting. It does smoke quite a lot when pushed quite hard. Been told its overboosting. Is that the same as over fueling?

what causes it? and can it damage any components?

my cars remapped to about 170bhp.

Over-boosting - Running a higher than designed manifold air pressure. Does that help? The effect is to try and get more air than was intended into the engine.

If the car's smoking when pushed hard, I'm not sure that's anything to do with over-boost. As above, overboost means you have excess air, and diesels smoke when they have excess fuel, or are burning lubricating oil.

Overboosting put simply is when the turbo pressure exceeds what is being requested of the management system.

This can be down to sticky VNT vanes or actuator, or poor mapping..

Kev

The car engine ECU should protect the engine from any long periods of overboost . The ECU should automatically sense the higher manifold pressure sensor signal and then reduce power to protect the engine .

If you are smoking then you have too much fuel being put in. Did it smoke before the remap?

I have had mine maped and it smokes a little bit more than before, I have just been told to expect it.

I have had mine maped and it smokes a little bit more than before, I have just been told to expect it.

I can't quite agree with that either!

If you are smoking then you have too much fuel being put in. Did it smoke before the remap?

I think it did but a lot less and only really smoked when hard pushed on the rollers. Nothing out of the ordinary

Since i've been driving it i personally havent noticed it smoke that much..a puff or two. My exhaust doesn't appear to be soot covered. But when my mechanic drove it...well...lets just say he's a lot more enthusiastic than i am and has a test pilot mentality.

Edited 14 July, 201015 yr by newskoda

Overboost kills turbos - beware!

You're ECU should be requesting XX PSI boost and the turbo should be providing XX as well. Mine is requesting 2.2 bar and my gauge sits smack on 2.2 bar for most of the rev range - If it was at 2.5 bar or more, I would know it is overboosting and there was trouble.

If you have no guage, you need to go out with someone with vagcom and log group 11 in the engine section to see the requested VS actual manifold pressure.

Overboost kills turbos - beware!

You're ECU should be requesting XX PSI boost and the turbo should be providing XX as well. Mine is requesting 2.2 bar and my gauge sits smack on 2.2 bar for most of the rev range - If it was at 2.5 bar or more, I would know it is overboosting and there was trouble.

If you have no guage, you need to go out with someone with vagcom and log group 11 in the engine section to see the requested VS actual manifold pressure.

thanks all for your advice.

I will try to get it logged on Vag com to be sure and will try to also get it on the rollers to see the extent of the smoking. My mate drove mine when i was behind her and it didnt smoke much at all. She drives quicker than me.

Only seemed to smoke more when the mechanic was caning it. Ahem...doing 70mph in a local road.I was nearly sick.

Intake temperature from driving hard causing smoke?

Kev

Edited 14 July, 201015 yr by Jabbasport

my new fabia does kick out a heavy black cloud , would a PD160 intake reduce this ?

my new fabia does kick out a heavy black cloud , would a PD160 intake reduce this ?

Nope

Nitrous would

Kev